Tag Archives: HWISI

Typhoon Kalmaegi Intensifies to Equivalent of a Major Hurricane

Typhoon Kalmaegi intensified to the equivalent of a major hurricane east of Vietnam on Wednesday.  At 4:00 p.m. EST on Wednesday the center of Typhoon Kalmaegi was located at latitude 13.4°N and longitude 113.6°E which put the center about 335 miles (540 km) east-southeast of Quy Nohn, Vietnam.  Kalmaegi was moving toward the west-northwest at 21 m.p.h. (33 km/h).  The maximum sustained wind speed was 115 m.p.h. (185 km/h) and there were wind gusts to 145 m.p.h. (235 km/h).  The minimum surface pressure was 960 mb.

Typhoon Kalmaegi continued to strengthen on Wednesday as it moved over the South China Sea east of Vietnam.  A small circular eye was at the center of Kalmaegi’s circulation.  The eye was surrounded by a ring of thunderstorms and the strongest winds were occurring in that ring of storms.  Bands of showers and thunderstorms were revolving around the center of Typhoon Kalmaegi.  Storms near the center of Kalmaegi generated upper level divergence that pumped mass away from the typhoon.  The removal of mass caused the surface pressure to decrease.

The circulation around Typhoon Kalmaegi was relatively small. Winds to typhoon force extended out 30 miles (50 km) from the center of Kalmaegi’s circulation. Winds to tropical storm force extended out 115 miles (185 km) from the center of Typhoon Kalmaegi.

The Hurricane Intensity Index (HII) for Typhoon Kalmaegi was 20.6.  The Hurricane Size Index (HSI) was 12.5 and the Hurricane Wind Intensity Size Index (HWISI) was 33.1.  Typhoon Kalmaegi was similar in size and intensity to Hurricane Delta when Delta hit Louisiana in 2020.

Typhoon Kalmaegi will move through an environment somewhat favorable for intensification during the next 18 hours.  Kalmaegi will move over water where the Sea Surface Temperatures are near 28°C.  It will move under the southern part of an upper level ridge that is over China.  The upper level ridge will produce easterly winds that will blow toward the top of Kalmaegi’s circulation.  Those winds will cause some vertical wind shear. The vertical wind shear will inhibit intensification but the wind shear may not be enough to prevent intensification.  There is drier air to the north of Kalmaegi.  Typhoon Kalmaegi could intensify during the next 18 hours if the drier air remains north of the typhoon.

Typhoon Kalmaegi will move around the southern side of a high pressure system that is over China.  The high pressure system will steer Kalmaegi toward the west-northwest during the next 24 hours.  On its anticipated track, Typhoon Kalmaegi will reach the coast of central Vietnam in 18 hours.

The center of Typhoon Kalmaegi is likely to make landfall on the coast of Vietnam near Quy Nohn.  Kalmaegi will bring strong winds and heavy rain to central Vietnam.  Heavy rain will cause flash floods in some locations.  Typhoon Kalmaegi could also cause a storm surge of up to 10 feet (3 meters) along parts of the coast.

Typhoon Kalmaegi will also drop heavy rain over southern Laos, Cambodia, and northern Thailand.

Elsewhere over the Western North Pacific Ocean, former Tropical Depression 32W strengthened to Tropical Storm Fung-wong east of Yap.  At 4:00 p.m. EST on Wednesday the center of Tropical Storm Fung-wong was located at latitude 9.7°N and longitude 140.6°E which put the center about 190 miles (305 km) east of Yap.  Fung-wong was moving toward the west-northwest at 14 m.p.h. (22 km/h).  The maximum sustained wind speed was 40 m.p.h. (65 km/h) and there were wind gusts to 50 m.p.h. (80 km/h).  The minimum surface pressure was 996 mb.  Tropical Storm Fung-wong is forecast to intensify to a typhoon.

Typhoon Kalmaegi Moves over South China Sea

Typhoon Kalmaegi moved over the South China Sea on Wednesday.  At 10:00 a.m. EST on Wednesday the center of Typhoon Kalmaegi was located at latitude 12.7°N and longitude 115.2°E which put the center about 450 miles (725 km) east-southeast of Quy Nohn, Vietnam.  Kalmaegi was moving toward the west-northwest at 14 m.p.h. (22 km/h).  The maximum sustained wind speed was 105 m.p.h. (165 km/h) and there were wind gusts to 125 m.p.h. (200 km/h).  The minimum surface pressure was 970 mb.

Typhoon Kalmaegi strengthened again on Wednesday as it moved over the South China Sea.  A new, small circular eye formed at the center of Kalmaegi’s circulation.  The eye was surrounded by a ring of thunderstorms and the strongest winds were occurring in that ring of storms.  Bands of showers and thunderstorms were revolving around the center of Typhoon Kalmaegi.  Storms near the center of Kalmaegi generated upper level divergence that pumped mass away from the typhoon.  The removal of mass caused the surface pressure to decrease.

The circulation around Typhoon Kalmaegi was relatively small.  Winds to typhoon force extended out 35 miles (55 km) from the center of Kalmaegi’s circulation.  Winds to tropical storm force extended out 140 miles (225 km) from the center of Typhoon Kalmaegi.

The Hurricane Intensity Index (HII) for Typhoon Kalmaegi was 17.8.  The Hurricane Size Index (HSI) was 12.0 and the Hurricane Wind Intensity Size Index (HWISI) was 29.8.  Typhoon Kalmaegi was similar in size and intensity to Hurricane Sally when Sally hit South Alabama in 2020.

Typhoon Kalmaegi will move through an environment somewhat favorable for intensification during the next 24 hours.  Kalmaegi will move over water where the Sea Surface Temperatures are near 28°C.  It will move under the southern part of an upper level ridge that is over China.  The upper level ridge will produce easterly winds that will blow toward the top of Kalmaegi’s circulation.  Those winds will cause some vertical wind shear.  The vertical wind shear will inhibit intensification but the wind shear may not be enough to prevent intensification.  There is drier air to the north of Kalmaegi.  Typhoon Kalmaegi could intensify during the next 24 hours if the drier air remains north of the typhoon.  Kalmaegi could strengthen to the equivalent of a major hurricane.

Typhoon Kalmaegi will move around the southern side of a high pressure system that is over China.  The high pressure system will steer Kalmaegi toward the west-northwest during the next 24 hours.  On its anticipated track, Typhoon Kalmaegi will reach the coast of central Vietnam in 24 hours.

The center of Typhoon Kalmaegi is likely to make landfall on the coast of Vietnam near Quy Nohn.  Kalmaegi will bring strong winds and heavy rain to central Vietnam.  Heavy rain will cause flash floods in some locations.  Typhoon Kalmaegi could also cause a storm surge of up to 10 feet (3 meters) along parts of the coast.

Typhoon Kalmaegi will also drop heavy rain over southern Laos, Cambodia, and northern Thailand.

Elsewhere over the Western North Pacific Ocean, Tropical Depression 32W  was slowly becoming more organized east of Yap.  At 10:00 a.m. EST on Wednesday the center of Tropical Depression 32W was located at latitude 8.9°N and longitude 142.3°E which put the center about 300 miles (485 km) east of Yap.  The tropical depression was moving toward the west at 8 m.p.h. (13 km/h).  The maximum sustained wind speed was 35 m.p.h. (55 km/h) and there were wind gusts to 45 m.p.h. (75 km/h).  The minimum surface pressure was 998 mb.  It is forecast to strengthen.

Typhoon Kalmaegi Brings Wind and Rain to the Philippines

Typhoon Kalmaegi brought wind and rain to parts of the Philippines on Monday.  At 10:00 a.m. EST on Monday the center of Typhoon Kalmaegi was located at latitude 10.6°N and longitude 125.6°E which put the center about 50 miles (80 km) east of Abuyog, Philippines.  Kalmaegi was moving toward the west at 16 m.p.h. (26 km/h).  The maximum sustained wind speed was 105 m.p.h. (165 km/h) and there were wind gusts to 125 m.p.h. (200 km/h).  The minimum surface pressure was 968 mb.

Typhoon Kalmaegi continued to strengthen as it approached the central Philippines on Monday.  A small circular eye developed at the center of Kalmaegi’s circulation.  The eye was surrounded by a ring of thunderstorms and the strongest winds were occurring in that ring of storms.  Bands of showers and thunderstorms were revolving around the core of Typhoon Kalmaegi.  Storms neat the center of Kalmaegi generated upper level divergence that pumped mass away from the typhoon.  The removal of mass caused the surface pressure to decrease.

The distribution of wind speeds around Typhoon Kalmaegi was symmetrical.  Winds to typhoon force extended out 35 miles (55 km) from the center of Kalmaegi’s circulation.  Winds to tropical storm force extended out 125 miles (200 km) from the center of Typhoon Kalmaegi.

The Hurricane Intensity Index (HII) for Typhoon Kalmaegi was 17.8.  The Hurricane Size Index (HSI) was 13.7 and the Hurricane Wind Intensity Size Index (HWISI) was 31.5.  Typhoon Kalmaegi was similar in size and intensity to Hurricane Sally when Sally hit South Alabama in 2020.

Typhoon Kalmaegi will weaken when the center of circulation passes over the central Philippines.  Kalmaegi will move into an environment favorable for intensification when it reaches the Sulu Sea on Tuesday.  Kalmaegi will move over water where the Sea Surface Temperatures are near 29°C.  It will move under the southern part of an upper level ridge over the Western North Pacific Ocean.  The upper level ridge will produce easterly winds that will blow toward the top of Kalmaegi’s circulation.  Those winds will cause some vertical wind shear, but the wind shear will not be enough to prevent intensification.  Typhoon Kalmaegi will start to intensify again when it reaches the Sulu Sea.

Typhoon Kalmaegi will move around the southern side of a high pressure system over the Western North Pacific Ocean.  The high pressure system will steer Kalmaegi toward the west during the next 24 hours.  On its anticipated track, Typhoon Kalmaegi will move through the central Philippines during the next 24 hours.  The center of Kalmaegi will pass near southern Leyte, Bohol, Cebu, northern Negros, and Panay Island.  Typhoon Kalmaegi will pass near northern Palawan on Tuesday.

Typhoon Kalmaegi will bring strong winds and heavy rain to the central Philippines.  The strongest winds and heaviest rain will occur at Dinagat Island, southern Leyte, Bohol, Cebu, northern Negros, Panay Island, and northern Palawan.  Heavy rain is likely to cause flash floods in some locations.  Typhoon Kalmaegi could also cause a storm surge of up to 10 feet (3 meters) along the coast.

Hurricane Melissa Speeds Toward Bermuda

Hurricane Melissa was speeding toward Bermuda on Thursday morning.  At 8:00 a.m. EDT on Thursday the center of Hurricane Melissa was located at latitude 26.8°N and longitude 72.7°W which put the center about 605 miles (980 km) southwest of Bermuda.  Melissa was moving toward the north-northeast at 21 m.p.h. (33 km/h).  The maximum sustained wind speed was 105 m.p.h. (165 km/h) and there were wind gusts to 125 m.p.h. (200 km/h).  The minimum surface pressure was 965 mb.

A Hurricane Warning is in effect for Bermuda.

Hurricane Melissa strengthened as it moved over warm water near the Bahamas on Wednesday night.  A new larger eye formed at the center of Melissa’s circulation.  The eye was surrounded by a broken ring of thunderstorms and the strongest winds were occurring in that broken ring of storms.  Bands of showers and thunderstorms were revolving around the core of Melissa’s circulation.  Storms near the core of Melissa generated upper level divergence that pumped more mass away to the northeast of the hurricane.  The removal of more mass caused the surface pressure to decrease again.

The size of the circulation around Hurricane Melissa increased as it strengthened again.  Winds to hurricane force extended out 60 miles (95 km) from the center of Melissa’s circulation.  Winds to tropical storm force extended out 195 miles (315 km) from the center of Hurricane Melissa.

The Hurricane Intensity Index (HII) for Hurricane Melissa is 17.8.  The Hurricane Size Index (HSI) is 19.8 and the Hurricane Wind Intensity Size Index (HWISI) is 37.6.

Hurricane Melissa will move through an environment somewhat favorable for intensification during the next 24 hours.  Melissa will move over water where the Sea Surface Temperatures are near 27°C.  It will move under the eastern part of an upper level trough that is over the eastern U.S.  The upper level trough will produce southwesterly winds that will blow toward the top of Melissa’s circulation.  Those winds will cause moderate vertical wind shear.  The moderate vertical wind shear will inhibit intensification, but the wind shear may not be enough to prevent intensification.  Hurricane Melissa could intensify during the next 24 hours.  The upper level winds will get stronger on Friday.  More vertical wind shear will cause Hurricane Melissa to weaken.  The stronger wind shear will also cause Melissa to start a transition to an extratropical cyclone.

The upper level trough will steer Hurricane Melissa toward the northeast during the next 24 hours.  On its anticipated track, Hurricane Melissa will be near Bermuda on Thursday night.

Hurricane Melissa will bring strong winds and heavy rain to Bermuda on Thursday night.  Melissa will pass near the southeastern part of Newfoundland on Friday night.

Hurricane Melissa Brings Wind and Rain to the Bahamas

Hurricane Melissa was bringing wind and rain to the Bahamas on Wednesday afternoon.  At 5:00 p.m. EDT on Wednesday the center of Hurricane Melissa was located at latitude 22.9°N and longitude 74.8°W which put the center about 20 miles (30 km) southeast of Clarence Town, Bahamas.  Melissa was moving toward the northeast at 16 m.p.h. (26 km/h).  The maximum sustained wind speed was 90 m.p.h. (145 km/h) and there were wind gusts to 105 m.p.h. (165 km/h).  The minimum surface pressure was 974 mb.

Hurricane Warnings are in effect for the Central Bahamas and the Southeastern Bahamas.

A Hurricane Watch is in effect for Bermuda.

Tropical Storm Warnings are in effect for the Turks and Caicos.

The circulation around Hurricane Melissa showed signs of reorganization on Friday afternoon.  However, passage over Jamaica and eastern Cuba significant changed the structure of the core of Melissa’s circulation.  A new large eye with a diameter of 45 miles (75 km) formed at the center of Hurricane Melissa.  New thunderstorms were developing in a broken ring that surrounded the large eye.  The strongest winds were occurring in that broken ring of storms.  New thunderstorms were also forming in the bands revolving around the center of Melissa’s circulation.

The structural changes in the middle of Hurricane Melissa caused the size of the circulation to increase.  Winds to hurricane force extended out 60 miles (95 km) in the eastern side of Melissa’s circulation.  Winds to hurricane force extended out 25 miles (40 km) in the western side of Hurricane Melissa.  Winds to tropical storm force extended out 185 miles (300 km) in the eastern half of Melissa’s circulation.  Winds to tropical storm force extended out 125 miles (200 km) in the western half of Hurricane Melissa.

The Hurricane Intensity Index (HII) for Hurricane Melissa is 13.9.  The Hurricane Size Index (HSI) is 16.6 and the Hurricane Wind Intensity Size Index (HWISI) is 30.5.  Hurricane Melissa is similar in intensity to Hurricane Beryl when Beryl hit Texas in 2024.  Melissa is much larger than Beryl was.

Hurricane Melissa will move through an environment marginally favorable for intensification during the next 12 hours.  Melissa will move over water where the Sea Surface Temperatures are near 28°C.  It will move under the southeastern part of an upper level trough over the eastern U.S.  The upper level trough will produce southwesterly winds that will blow toward the top of Melissa’s circulation.  Those winds will cause the vertical wind shear to increase. The vertical wind shear will inhibit intensification, but the wind shear may not be enough to prevent intensification.  Hurricane Melissa could intensify during the next 12 hours.  The upper level winds will get stronger on Thursday.  More vertical wind shear will cause Hurricane Melissa to weaken.  The stronger wind shear will also cause Melissa to start a transition to an extratropical cyclone.

The upper level trough will steer Hurricane Melissa toward the northeast during the next 24 hours.  On its anticipated track, Melissa will continue to move over the Bahamas during the next few hours.  Hurricane Melissa will be near Bermuda on Thursday night.

Hurricane Melissa will continue to bring strong winds and heavy rain to the Central and Southeastern Bahamas on Wednesday night.  Melissa could bring strong winds and heavy rain to Bermuda on Thursday night.

Hurricane Melissa Batters Eastern Cuba

Strong winds in Hurricane Melissa battered eastern Cuba early on Wednesday.  At 8:00 a.m. EDT on Wednesday the center of Hurricane Melissa was located at latitude 20.6°N and longitude 75.7°W which put the center about 45 miles (75 km) northwest of Guantanamo, Cuba.  Melissa was moving toward the north-northeast at 14 m.p.h. (22 km/h).  The maximum sustained wind speed was 105 m.p.h. (165 km/h) and there were wind gusts to 125 m.p.h. (200 km/h).  The minimum surface pressure was 968 mb.

Hurricane Warnings are in effect for the Cuban provinces of Granma, Santiago de Cuba, Guantanamo, Holguin, and Las Tunas.

Hurricane Warnings are in effect for the Central Bahamas and the Southeastern Bahamas.

A Hurricane Watch is in effect for Bermuda.

A Tropical Storm Warning is in effect for Haiti.

A Tropical Storm Warning is in effect for the Cuban province of Camaguey.

A Tropical Storm Warning is in effect for the Turks and Caicos.

After leaving a trail of destruction in Jamaica, Hurricane Melissa battered eastern Cuba early on Wednesday.  Melissa was still a major hurricane at the time is made the center of circulation landfall in the province of Santiago de Cuba.  Melissa started to weaken slowly again after the center moved over land.

Hurricane Melissa was still a powerful storm on Wednesday morning.  Winds to hurricane force extended out 30 miles (50 km) from the center of Melissa’s circulation.  Winds to tropical storm force extended out 185 miles (300 km) in the eastern half of Melissa’s circulation.  Winds to tropical storm force extended out 105 miles (165 km) in the western side of Hurricane Melissa.

The Hurricane Intensity Index (HII) for Hurricane Melissa at the time of landfall was 17.8.  The Hurricane Size Index (HSI) was 11.9 and the Hurricane Wind Intensity Size Index (HWISI) was 29.7. Hurricane Melissa was similar in size and intensity to Hurricane Sally when Sally hit South Alabama in 2020.

Hurricane Melissa will move through an environment marginally favorable for intensification during the next 24 hours.  Melissa will move over water where the Sea Surface Temperatures are near 28°C.  It will move under the southeastern part of an upper level trough over the eastern U.S.  The upper level trough will produce southwesterly winds that will blow toward the top of Melissa’s circulation.  Those winds will cause the vertical wind shear to increase.  The vertical wind shear will inhibit intensification.  Hurricane Melissa is likely to maintain its intensity during the next 24 hours after it moves northeast of Cuba.

The upper level trough will steer Hurricane Melissa toward the northeast during the next 24 hours.  On its anticipated track, Melissa will move northeast of Cuba during the next few hours.  Hurricane Melissa will move over the Bahamas later today.  Melissa will be near Bermuda on Thursday night.

Hurricane Melissa will continue to bring strong winds and heavy rain to eastern Cuba during the next few hours.  Heavy rain is likely to cause flash floods in some location.  Widespread electricity outages are likely in eastern Cuba.  Melissa will also bring strong winds and heavy rain to the Bahamas later today.

Hurricane Melissa Hits Jamaica

Hurricane Melissa hit Jamaica on Tuesday.  At 2:00 p.m. EDT on Tuesday the center of Hurricane Melissa was located at latitude 18.2°N and longitude 78.0°W which put the center about 20 miles 305 km) south-southwest of Montego Bay, Jamaica.  Melissa was moving toward the north-northeast at 8 m.p.h. (13 km/h). The maximum sustained wind speed was 165 m.p.h. (265 km/h) and there were wind gusts to 195 m.p.h. (315 km/h).  The minimum surface pressure was 899 mb.

A Hurricane Warning is in effect for Jamaica.

Hurricane Warnings are in effect for the Cuban provinces of Granma, Santiago de Cuba, Guantanamo, Holguin, and Las Tunas.

Hurricane Warnings are in effect for the Central Bahamas and the Southeastern Bahamas.

A Tropical Storm Warning is in effect for Haiti.

A Tropical Storm Warning is in effect for the Cuban province of Camaguey.

A Tropical Storm Warning is in effect for the Turks and Caicos.

Hurricane Melissa was at Category 5 on the Saffir-Simpson Scale at the time of landfall.  The maximum sustained wind speed was 185 m.p.h. (300 km/h).  The minimum surface pressure was 892 mb.

The Hurricane Intensity Index (HII) for Hurricane Melissa at the time of landfall was 44.1.  The Hurricane Size Index (HSI) was 11.4 and the Hurricane Wind Intensity Size Index (HWISI) was 55.5.  Hurricane Melissa was similar in size and intensity to Hurricane Dorian when Dorian hit the Bahamas in 2019.

Hurricane Melissa was still a Category 5 hurricane on Tuesday afternoon.  A circular eye with a diameter of 17 miles (28 km) was at the center of Melissa’s circulation.  The eye was surrounded by a ring of thunderstorms and the strongest winds were occurring in that ring of storms.  Bands of showers and thunderstorms were revolving around the center of Hurricane Melissa.  Storms near the center of Melissa generated strong upper level divergence that pumped large quantities of mass away from the hurricane.  The removal of large amounts of mass in the upper levels was nearly balanced by a strong inflow of mass in the lower levels of the atmosphere.  The near balance of inflow and outflow of mass caused the surface pressure to remain nearly very low during the past few hours.

Winds to hurricane force extended out 30 miles (50 km) from the center of Hurricane Melissa.  Winds to tropical storm force extended out 195 miles (315 km) in the eastern half of Melissa’s circulation.  Winds to tropical storm force extended out 90 miles (145 km) in the western side of Hurricane Melissa.

An upper level trough over the southeastern U.S. will steer Hurricane Melissa toward the northeast during the next 24 hours.  On its anticipated track, the core of Hurricane Melissa will l move northeast across Jamaica.  Melissa will reach eastern Cuba early on Wednesday.  Hurricane Melissa will be over the Bahamas on Wednesday evening.

Hurricane Melissa will drop very heavy rain on Jamaica, Haiti and parts of the Dominican Republic.  Very heavy rain is likely to cause catastrophic floods in some locations.  Hurricane Melissa will also produce very strong winds in Jamaica.  Melissa will be capable of causing severe damage.  Widespread electricity outages are likely.  Infrastructure and transportation are likely to be severely damaged.  Melissa could produce a storm surge of up to 16 feet (5 meters) along the south coast of Jamaica.

Hurricane Melissa will also bring strong winds and locally heavy rain to eastern Cuba, the Central and Southeastern Bahamas, and the Turks and Caicos.  Heavy rain is likely to cause flash floods in some locations.  Widespread electricity outages are also likely in eastern Cuba.

Hurricane Melissa Nears Jamaica

The core of Hurricane Melissa was nearing southwestern Jamaica on Tuesday morning.  At 10:00 a.m. EDT on Tuesday the center of Hurricane Melissa was located at latitude 17.7°N and longitude 78.1°W which put the center about 45 miles (75 km) south-southeast of Negril, Jamaica.  Melissa was moving toward the north-northeast at 7 m.p.h. (11 km/h).  The maximum sustained wind speed was 185 m.p.h. (300 km/h) and there were wind gusts to 220 m.p.h. (355 km/h).  The minimum surface pressure was 892 mb.

A Hurricane Warning is in effect for Jamaica.

Hurricane Warnings are in effect for the Cuban provinces of Granma, Santiago de Cuba, Guantanamo, and Holguin.

Hurricane Warnings are in effect for the Central Bahamas and the Southeastern Bahamas.

A Hurricane Watch is in effect for the Turks and Caicos.

A Tropical Storm Warning is in effect for Haiti.

A Tropical Storm Warning is in effect for the Cuban province of Las Tunas.

A Tropical Storm Warning is in effect for the Turks and Caicos.

Winds to tropical storm force were already occurring in Jamaica even though the core of Hurricane Melissa was still southwest of Jamaica.  A weather station at the Norman Manley International Airport in Kingston reported a sustained wind speed of 43 m.p.h. (69 km/h) and a wind gust of 59 m.p.h. (93 km/h).  A weather station at the Sangster International Airport in Montego Bay reported a sustained wind speed of 38 m.p.h. (61 km/h) and a wind gust of 54 m.p.h. (87 km/h).  Heavy rain was already falling over parts of Jamaica.

The core of dangerous Hurricane Melissa was nearing the coast of southwestern Jamaica on Tuesday morning.  A circular eye with a diameter of 12 miles (19 km) was at the center of Melissa’s circulation.  The eye was surrounded by a ring of thunderstorms and the strongest winds were occurring in that ring of storms.  Bands of showers and thunderstorms were revolving around the center of Hurricane Melissa.  Storms near the center of Melissa generated strong upper level divergence that pumped large quantities of mass away from the hurricane.  The removal of large amounts of mass in the upper levels was nearly balanced by a strong inflow of mass in the lower levels of the atmosphere.  The near balance of inflow and outflow of mass caused the surface pressure to remain nearly steady during the past few hours.

Winds to hurricane force extended out 30 miles (50 km) from the center of Hurricane Melissa.   Winds to tropical storm force extended out 195 miles (315 km) in the eastern half of Melissa’s circulation.  Winds to tropical storm force extended out 90 miles (145 km) in the western side of Hurricane Melissa.

The Hurricane Intensity Index (HII) for Hurricane Melissa is 44.1.  The Hurricane Size index (HSI) is 11.4 and the Hurricane Wind Intensity Size Index (HWISI) is 55.5.  Hurricane Melissa is similar in size and intensity to Hurricane Dorian when Dorian hit the Bahamas in 2019.

Hurricane Melissa will move through an environment favorable for a very powerful hurricane during the few hours until it makes landfall in Jamaica.  Melissa will move over water where the Sea Surface Temperatures are near 30°C.  It will move through a region where the upper level winds are weak and there will be little vertical wind shear.  Hurricane Melissa is likely to maintain its intensity until it makes landfall in Jamaica unless an eyewall replacement cycle occurs.  If the inner end of a rainband wraps around the existing eye and eyewall, then the formation of concentric eyewalls would cause Melissa to start to weaken.

An upper level trough over the southeastern U.S. will steer Hurricane Melissa toward the northeast during the next 24 hours.  On its anticipated track, the core of Hurricane Melissa will reach southwestern Jamaica on Tuesday morning.  Melissa will move northeast across Jamaica during much of Tuesday.  Hurricane Melissa will reach eastern Cuba early on Wednesday.

Hurricane Melissa will drop very heavy rain on Jamaica, Haiti and parts of the Dominican Republic.  Very heavy rain is likely to cause catastrophic floods in some locations.  Hurricane Melissa will also produce very strong winds in Jamaica.  Melissa will be capable of causing severe damage.  Widespread electricity outages are likely.  Infrastructure and transportation are likely to be severely damaged.  Melissa could produce a storm surge of up to 16 feet (5 meters) along the south coast of Jamaica.

Hurricane Melissa will also bring strong winds and locally heavy rain to eastern Cuba, the Central and Southeastern Bahamas, and the Turks and Caicos.  Heavy rain is likely to cause flash floods in some locations.  Widespread electricity outages are also likely in eastern Cuba.

Hurricane Melissa Turns Toward Jamaica

Hurricane Melissa started to make a slow turn toward Jamaica on Monday evening.  At 11:00 p.m. EDT on Monday the center of Hurricane Melissa was located at latitude 16.6°N and longitude 78.5°W which put the center about 150 miles (240 km) southwest of Kingston, Jamaica.  Melissa was moving toward the north-northeast at 2 m.p.h. (3 km/h).  The maximum sustained wind speed was 175 m.p.h. (285 km/h) and there were wind gusts to 205 m.p.h. (330 km/h).  The minimum surface pressure was 903 mb.

A Hurricane Warning is in effect for Jamaica.

Hurricane Warnings are in effect for the Cuban provinces of Granma, Santiago de Cuba, Guantanamo, and Holguin.

Hurricane Warnings are in effect for the Central Bahamas and the Southeastern Bahamas.

A Hurricane Watch is in effect for the Turks and Caicos.

A Tropical Storm Warning is in effect for Haiti.

A Tropical Storm Warning is in effect for the Cuban province of Las Tunas.

A Tropical Storm Warning is in effect for the Turks and Caicos.

Powerful Hurricane Melissa started a slow turn toward Jamaica on Monday evening.  A circular eye with a diameter of 12 miles (19 km) was at the center of Melissa’s circulation.  The eye was surrounded by a ring of thunderstorms and the strongest winds were occurring in that ring of storms.  Bands of showers and thunderstorms were revolving around the center of Hurricane Melissa.  Storms near the center of Melissa generated strong upper level divergence that pumped large quantities of mass away from the hurricane.  The removal of large amounts of mass in the upper levels was nearly balanced by a strong inflow of mass in the lower levels of the atmosphere.  The near balance of inflow and outflow of mass caused the surface pressure to remain nearly steady during the past few hours.

Winds to hurricane force extended out 30 miles (50 km) from the center of Melissa’s circulation.  Winds to tropical storm force extended out 195 miles (315 km) in the eastern half of Hurricane Melissa.  Winds to tropical storm force extended out 90 miles (145 km) in the western side of Melissa’s circulation.

The Hurricane Intensity Index (HII) for Hurricane Melissa is 40.4.  The Hurricane Size index (HSI) is 11.4 and the Hurricane Wind Intensity Size Index (HWISI) is 51.8.  Hurricane Melissa is similar in size and intensity to Hurricane Andrew when Andrew was at its peak intensity in 1992.

Hurricane Melissa will move through an environment favorable for a very powerful hurricane during the next 12 hours.  Melissa will move over water where the Sea Surface Temperatures are near 30°C.  It will move through a region where the upper level winds are weak and there will be little vertical wind shear.  Hurricane Melissa is likely to maintain its intensity during the next 12 hours unless an eyewall replacement cycle occurs.  If the inner end of a rainband wraps around the existing eye and eyewall, then the formation of concentric eyewalls would cause Melissa to weaken.

An upper level trough over the southeastern U.S. will start to steer Hurricane Melissa toward the northeast during the next 24 hours.  On its anticipated track, the core of Hurricane Melissa will reach southwestern Jamaica on Tuesday morning.  Melissa will move northeast across Jamaica during much of Tuesday.  Hurricane Melissa will reach eastern Cuba early on Wednesday.

Hurricane Melissa will drop very heavy rain on Jamaica, Haiti and parts of the Dominican Republic.  Very heavy rain is likely to cause catastrophic floods in some locations.  Hurricane Melissa will also produce very strong winds in Jamaica.  Melissa will be capable of causing severe damage.  Widespread electricity outages are likely.  Infrastructure and transportation are likely to be severely affected.  Melissa could produce a storm surge of up to 16 feet (5 meters) along the south coast of Jamaica.

Hurricane Melissa will also bring strong winds and locally heavy rain to eastern Cuba, the Central and Southeastern Bahamas, and the Turks and Caicos.  Heavy rain is likely to cause flash floods in some locations.  Widespread electricity outages are also likely in eastern Cuba.

Hurricane Melissa Intensifies to Cat. 5

Hurricane Melissa intensified to Category 5 on the Saffir-Simpson Scale early on Monday.  At 8:00 a.m. EDT on Monday the center of Hurricane Melissa was located at latitude 16.4°N and longitude 78.0°W which put the center about 135 miles (220 km) southwest of Kingston, Jamaica.  Melissa was moving toward the west at 3 m.p.h. (5 km/h).  The maximum sustained wind speed was 160 m.p.h. (260 km/h) and there were wind gusts to 190 m.p.h. (305 km/h).  The minimum surface pressure was 913 mb.

A Hurricane Warning is in effect for Jamaica.

Hurricane Warnings are in effect for the Cuban provinces of Granma, Santiago de Cuba, Guantanamo, and Holguin.

Hurricane Watches are in effect for the Central Bahamas, the Southeastern Bahamas, and the Turks and Caicos.

A Tropical Storm Warning is in effect for Haiti.

A Tropical Storm Warning is in effect for the Cuban province of Las Tunas.

Hurricane Melissa intensified to Category 5 on the Saffir-Simpson Scale early on Monday.  A circular eye with a diameter of 12 miles (19 km) was at the center of Melissa’s circulation.  The eye was surrounded by a ring of thunderstorms and the strongest winds were occurring in that ring of storms.  Bands of showers and thunderstorms were revolving around the center of Hurricane Melissa.  Storms near the center of Melissa generated strong upper level divergence that pumped large quantities of mass away from the hurricane.  The removal of large amounts of mass caused the surface pressure to decrease rapidly.

Winds to hurricane force extended out 30 miles (50 km) from the center of Melissa’s circulation.  Winds to tropical storm force extended out 195 miles (315 km) in the eastern half of Hurricane Melissa.  Winds to tropical storm force extended out 90 miles (145 km) in the western side of Melissa’s circulation.

The Hurricane Intensity Index (HII) for Hurricane Melissa is 35.0.  The Hurricane Size index (HSI) is 11.4 and the Hurricane Wind Intensity Size Index (HWISI) is 46.4.  Hurricane Melissa is similar in size and intensity to Hurricane Andrew when Andrew made landfall in South Florida in 1992.

Hurricane Melissa will move through an environment favorable for a very powerful hurricane during the next 24 hours.  Melissa will move over water where the Sea Surface Temperatures are near 30°C.  It will move through a region where the upper level winds are weak and there will be little vertical wind shear.  Hurricane Melissa could intensify during the next 24 hours unless an eyewall replacement cycle occur.  If the inner end of a rainband wraps around the existing eye and eyewall, then concentric eyewalls could cause Melissa to weaken.

The high pressure system that has been steering Hurricane Melissa slowly toward the west is likely to weaken during the next 24 hours.  When the high pressure system weakens, Melissa will start to move slowly toward the north.  On its anticipated track, the core of Hurricane Melissa will hit Jamaica early on Tuesday.

Hurricane Melissa will drop very heavy rain on Jamaica, Haiti and parts of the Dominican Republic.  Very heavy rain is likely to cause catastrophic floods in some locations.  Hurricane Melissa will also produce very strong winds in Jamaica.  Melissa will be capable of causing severe damage.  Widespread electricity outages are likely.  Melissa could produce a storm surge of up to 16 feet (5 meters) along the south coast of Jamaica.

Hurricane Melissa will also bring strong winds and locally heavy rain to eastern Cuba, the Central and Southeastern Bahamas, and the Turks and Caicos.