Typhoon In-Fa Moves Northeast

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Typhoon In-Fa started to move toward the northeast on Wednesday.  At 11:00 p.m. EDT on Wednesday the center of Typhoon In-Fa was located at latitude 29.2°N and longitude 141.2°E which put the center about 150 miles (240 km) west-northwest of Chichi Jima.  In-Fa was moving toward the northeast at 20 m.p.h. (32 km/h).  The maximum sustained wind speed was 85 m.p.h. (135 km/h) and there were wind gusts to 105 m.p.h. (165 km/h).  The minimum surface pressure was 979 mb.

Typhoon In-Fa began to make a transition to a strong extratropical cyclone on Wednesday.  An upper level trough over Japan was producing southwesterly winds that were blowing toward the top of In-Fa’s circulation.  Those winds were causing strong vertical wind shear.  The strong vertical wind shear caused the start of the transition of an extratropical cyclone.

The strong vertical wind shear was also affecting the structure of Typhoon In-Fa.  Thunderstorms were occurring in bands in the eastern side of In-Fa’s circulation.  Bands in the western side of Typhoon In-Fa consisted primarily of showers and lower clouds.  Storms near the center of In-Fa generated upper level divergence that pumped mass away to the west of the typhoon.  The removal of mass in the upper levels was less than the convergence of mass in the lower levels of the atmosphere.  So, the surface pressure increased on Wednesday.

The start of the transition to an extratropical cyclone caused Typhoon In-Fa to get a little larger on Wednesday.  Winds to typhoon force extended out 45 miles (75 km) from the center of In-Fa’s circulation.  Winds to tropical storm force extended out 155 miles (250 km) from the center of Typhoon In-Fa.

Typhoon In-Fa will move through an environment that will be unfavorable for intensification of a typhoon during the next 24 hours.  In-Fa will move over water where the Sea Surface Temperatures are near 23°C.  The upper level trough that is over Japan will continue to cause strong vertical wind shear.  Typhoon In-Fa is likely to weaken gradually during the next 24 hours because of strong vertical wind shear and cooler  Sea Surface Temperatures.  In-Fa will continue to make a transition to a strong extratropical cyclone.

The upper level trough over Japan will steer Typhoon In-Fa quickly toward the northeast during the next 24 hours.  On its anticipated track, Typhoon In-Fa will pass east of Japan on Thursday.

Typhoon In-Fa Passes West of Iwo To

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Typhoon In-Fa passed west of Iwo To on Tuesday night.  At 11:00 p.m. EDT on Tuesday the center of Typhoon In-Fa was located at latitude 24.8°N and longitude 138.4°E which put the center about 185 miles (295 km) west of Iwo To.  In-Fa was moving toward the north at 7 m.p.h. (11 km/h).  The maximum sustained wind speed was 100 m.p.h. (160 km/h) and there were wind gusts to 120 m.p.h. (195 km/h).  The minimum surface pressure was 972 mb.

Typhoon In-Fa maintained its intensity on Tuesday as it passed west of Iwo To.  A circular eye with a diameter of 20 miles (32 km) was at the center of In-Fa’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 In-Fa.  Storms near the center of In-Fa generated upper level divergence that pumped mass away from the typhoon.  The removal of mass in the upper levels was nearly equal to the convergence of mass in the lower levels of the atmosphere.  So, the surface pressure did not change much on Tuesday.

The distribution of wind speeds around Typhoon In-Fa was still relatively symmetrical.  Winds to typhoon force extended out 50 miles (80 km) from the center of In-Fa’s circulation.  Winds to tropical storm force extended out 130 miles (210 km) from the center of Typhoon In-Fa.

The Hurricane Intensity Index (HII) for Typhoon In-Fa is 16.5.  The Hurricane Size Index (HSI) is 16.6 and the Hurricane Wind Intensity Size Index (HWISI) is 33.2. Typhoon In-Fa is similar in intensity to Hurricane Isaias when Isaias hit Florida in 2023.  In-Fa is not as large as Iasais was.

Typhoon In-Fa will move through an environment that will be unfavorable for intensification of a typhoon during the next 24 hours.  In-Fa will move over water where the Sea Surface Temperatures are near 26°C.  It will move under the southern part of an upper level trough that is over Japan.  The upper level trough will produce west-southwesterly winds that will blow toward the top of In-Fa’s circulation.  Those winds will cause the vertical wind shear to increase.  Typhoon In-Fa is likely to weaken gradually during the next 24 hours because of more vertical wind shear.

The upper level trough over Japan will steer Typhoon In-Fa toward the northeast during the next 24 hours.  On its anticipated track, Typhoon In-Fa will pass southeast of Japan.

Typhoon In-Fa will move over cooler Sea Surface Temperatures during the next several days.  The combination of cooler water and more vertical wind shear will cause Typhoon In-Fa to make a transition to a strong extratropical cyclone.

Tropical Cyclone Murasu Brings Wind and Rain to Andhra Pradesh

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Tropical Cyclone Murasu brought wind and rain to Andhra Pradesh on Monday.  At 4:00 p.m. EST on Monday the center of Tropical Cyclone Murasu was located at latitude 15.3°N and longitude 80.4°E which put the center about 30 miles (50 km) southeast of Ongolu, India.  Murasu was moving toward the north-northwest at 6 m.p.h. (10 km/h).  The maximum sustained wind speed was 100 m.p.h. (160 km/h) and there were wind gusts to 120 m.p.h. (195 km/h).  The minimum surface pressure was 976 mb.

Tropical Cyclone Murasu became the second tropical cyclone to hit Andhra Pradesh in less than a week.  Tropical Cyclone Arnab made landfall on the coast of Andhra Pradesh last Tuesday a little to the northeast of where Murasu made landfall.

Tropical Cyclone Murasu rapidly intensified to the equivalent of a Category 2 hurricane on the Saffir-Simpson Scale on Monday as it approached the coast of Andhra Pradesh.  A small circular eye formed at the center of Murasu’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 Tropical Cyclone Murasu.

The circulation around Tropical Cyclone Murasu was very small.  Winds to hurricane/typhoon force extended out 20 miles (30 km) from the center of Murasu’s circulation.  Winds to tropical storm force only extended out 45 miles (75 km) from the center of Tropical Cyclone Murasu.

The Hurricane Intensity Index (HII) for Tropical Cyclone Murasu is 16.5.  The Hurricane Size Index (HSI) is 6.5 and the Hurricane Wind Intensity Size Index (HWISI) is 23.0.  Tropical Cyclone Murasu is similar in intensity to Hurricane Idalia when Idalia hit Florida in 2023.  Tropical Cyclone Murasu is not as big as Idalia was.

Tropical Cyclone Murasu will move around the western side of a high pressure system that is over the northern Bay of Bengal.  The high pressure system will steer Murasu toward the north-northwest during the next 24 hours.  On its anticipated track, Tropical Cyclone Murasu will move inland over Ongolu, India.  Murasu will move northwest of Ongolu when it moves farther inland.

Tropical Cyclone Murasu will bring strong winds and locally heavy rain to parts of Andhra Pradesh.   Murasu will be capable of causing serious damage as it moves inland.  Heavy rain will cause flash floods in some locations.  Tropical Cyclone Murasu could also cause a storm surge of up to 10 feet (3 meters) along parts of the coast of Andhra Pradesh.

Tropical Cyclone Murasu Nears Southeast India

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Tropical Cyclone Murasu was nearing the coast of southeastern India on Sunday evening.  At 10:00 p.m. EST on Sunday the center of Tropical Cyclone Murasu was located at latitude 13.7°N and longitude 81.5°E which put the center about 125 miles (200 km) east-southeast of Nellore, India.  Murasu was moving toward the west-northwest at 10 m.p.h. (16 km/h).  The maximum sustained wind speed was 65 m.p.h. (105 km/h) and there were wind gusts to 80 m.p.h. (130 km/h).  The minimum surface pressure was 996 mb.

Tropical Cyclone Murasu strengthened on Sunday as it moved toward the coast of Andhra Pradesh in southeastern India.  Thunderstorms were occurring near the center of Murasu’ circulation.  Bands of showers and thunderstorms were revolving around the center of Tropical Cyclone Murasu.  Storms near the center of Murasu generated upper level divergence that pumped mass away from the tropical cyclone.  The removal of mass caused the surface pressure to decrease on Sunday.

The circulation around Tropical Cyclone Murasu was small.  Winds to tropical storm force extended out 50 miles (80 km) from the center of Murasu’s circulation.

Tropical Cyclone Murasu will move through an environment somewhat favorable for intensification during the next 12 hours.  Murasu will move over water where the Sea Surface Temperatures are near 29°C.  It will move under the middle of an upper level ridge that is over southern India and the western part of the Bay of Bengal.  The upper level winds are weak near the middle of the ridge and there will be little vertical wind shear.  However, Murasu could run into a mass of drier air when it gets closer to the coast of India.  Tropical Cyclone Murasu could intensify during the next 12 hours.

Tropical Cyclone Murasu will move around the southern side of a high pressure system that is over South Asia and the Bay of Bengal.  The high pressure system will steer Murasu toward the west-northwest during the next 24 hours.  On its anticipated track, Tropical Cyclone Murasu will move reach the coast of Andhra Pradesh north of Nellore in about 12 hours.

Tropical Cyclone Murasu will bring strong winds and locally heavy rain to Andhra Pradesh.  Heavy rain will cause flash floods in some locations.  Tropical Cyclone Murasu could also cause a storm surge of up to 7 feet (2 meters) along parts of the coast of Andhra Pradesh.

New Tropical Cyclone Forms over Bay of Bengal

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A new tropical cyclone formed over the Bay of Bengal on Saturday.  At 11:00 p.m. EDT on Saturday the center of Tropical Cyclone 04B was located at latitude 11.9°N and longitude 86.0°E which put the center about 500 miles (805 km) east-southeast of Ongolu, India.  Tropical Cyclone 04B was moving toward the west-northwest at 12 m.p.h. (19 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 1007 mb.

A new tropical cyclone formed over the Bay of Bengal on Saturday.  The India Meteorological Department was classifying the tropical cyclone as a depression.  So, it has not yet been designated with a name.

Thunderstorms were occurring near the center of Tropical Cyclone 04B.  Thunderstorms were also occurring in bands revolving around the center of the tropical cyclone.  Storms near the center of circulation generated upper level divergence that pumped mass away from the tropical cyclone.  The removal of mass caused the surface pressure to decrease.

The strongest winds were occurring in the northeastern part of Tropical Cyclone 04B.  Winds to tropical storm force extended out 35 miles (55 km) in the northeastern quadrant of the tropical cyclone.  The winds in the other parts of Tropical Cyclone 04B were blowing at less than tropical storm force.

Tropical Cyclone 04B will move through an environment favorable for intensification during the next 24 hours.  The tropical cyclone will move over water where the Sea Surface Temperatures are near 29°C.  It will move under the middle of an upper level ridge that is over the Bay of Bengal.  The upper level winds are weak near the middle of the ridge and there will be little vertical wind shear.  Tropical Cyclone 04B will intensify during the next 24 hours.

Tropical Cyclone 04B will move around the southern side of a high pressure system that is over South Asia and the Bay of Bengal.  The high pressure system will steer that tropical cyclone toward the west-northwest during the next 24 hours.  On its anticipated track, Tropical Cyclone 04B will move toward Andhra Pradesh.  Tropical Cyclone 04B could approach the coast of Andhra Pradesh in 36 hours.

Tropical Cyclone 04B will bring strong winds and locally heavy rain to Andhra Pradesh.  Heavy rain will cause flash floods in some locations.  Tropical Cyclone 04B could also cause a storm surge of up to 7 feet (2 meters) along parts of the coast of Andhra Pradesh.

Typhoon In-Fa Stalls Southeast of Iwo To

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Typhoon In-Fa stalled over the Western North Pacific Ocean southeast of Iwo To on Saturday.  At 11:00 p.m. EDT on Saturday the center of Typhoon In-Fa was located at latitude 22.7°N and longitude 144.1°E which put the center about 235 miles (380 km) southeast of Iwo To.  In-Fa was moving toward the east-southeast at 4 m.p.h. (6 km/h).  The maximum sustained wind speed was 110 m.p.h. (175 km/h) and there were wind gusts to 130 m.p.h. (210 km/h).  The minimum surface pressure was 965 mb.

Typhoon In-Fa weakened gradually on Saturday while it stalled southeast of Iwo To.  A circular eye with a diameter of 40 miles (65 km) was still present at the center of In-Fa’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 In-Fa.  Storms near the center of In-Fa generated upper level divergence that pumped mass away from the typhoon.  The removal of mass in the upper levels was less than  the convergence of mass in the lower levels of the atmosphere.  So, the surface pressure increased on Saturday.

The distribution of wind speeds around Typhoon In-Fa was still relatively symmetrical.  Winds to typhoon force extended out 80 miles (130 km) from the center of In-Fa’s circulation.  Winds to tropical storm force extended out 150 miles (240 km) from the center of Typhoon In-Fa.

The Hurricane Intensity Index (HII) for Typhoon In-Fa is 19.2.  The Hurricane Size Index (HSI) is 23.6 and the Hurricane Wind Intensity Size Index (HWISI) is 42.8.  Typhoon In-Fa is similar in size and intensity to Hurricane Gustav when Gustav hit Louisiana in 2008.

Typhoon In-Fa will move through an environment that will be unfavorable for intensification during the next 24 hours.  In-Fa will move over water where the Sea Surface Temperatures are near 28°C.  It will move under the southern part of an upper level trough that is south of Japan.  The upper level trough will produce southwesterly winds that will blow toward the top of In-Fa’s circulation.  Those winds will cause the vertical wind shear to increase.  Typhoon In-Fa is likely to continue to weaken gradually on Sunday because of more vertical wind shear.

A high pressure system that is over the Western North Pacific Ocean southeast of Japan will start to steer Typhoon In-Fa toward the west during the next 24 hours.  On its anticipated track,  Typhoon In-Fa will move south of Iwo To on Sunday.

Typhoon In-Fa Batters Northern Marianas

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Typhoon In-Fa battered Agrihan, Pagan, and Alamagan in the Northern Marianas early on Friday.  At 5:00 a.m. EDT on Friday the center of Typhoon In-Fa was located at latitude 19.1°N and longitude 145.6°E which put the center about 35 miles (55 km) east of Agrihan.  In-Fa was moving toward the northwest at 20 m.p.h. (32 km/h).  The maximum sustained wind speed was 145 m.p.h. (235 km/h) and there were wind gusts to 175 m.p.h. (285 km/h).  The minimum surface pressure was 943 mb.

Typhoon In-Fa continued to be in a relatively steady state on Thursday.  A circular eye with a diameter of 40 miles (65 km) was at the center of In-Fa’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 In-Fa.  Storms near the center of In-Fa generated upper level divergence that pumped mass away from the typhoon.  The removal of mass in the upper levels was nearly equal to the convergence of mass in the lower levels of the atmosphere.  So, the surface pressure did not change much on Thursday.

The size of the circulation around Typhoon In-Fa increased on Thursday.  Winds to typhoon force extended out 80 miles (130 km) from the center of In-Fa’s circulation.  Winds to tropical storm force extended out 175 miles (285 km) from the center of Typhoon In-Fa.

The Hurricane Intensity Index (HII) for Typhoon In-Fa is 29.9.  The Hurricane Size Index (HSI) is 24.5 and the Hurricane Wind Intensity Size Index (HWISI) is 54.4. Typhoon In-Fa is similar in size and intensity to Hurricane Helen when Helene hit Florida in 2024.

Typhoon In-Fa will move through an environment that will be favorable for a strong typhoon during the next 24 hours.  In-Fa will move over water where the Sea Surface Temperatures are near 29°C.  It will move through a region where the upper level winds are weak and there will be little vertical wind shear.  Typhoon In-Fa appears to be in a near equilibrium with its environment.  In-Fa is likely to maintain its intensity during the next 24 hours.

Typhoon In-Fa will move around the southwestern part of a high pressure system that is over the Western North Pacific Ocean.  The high pressure system will steer In-Fa toward the northwest during the next 24 hours.  On its anticipated track, Typhoon In-Fa will move away from Alamagan, Pagan, and Agrihan on Friday.

Typhoon In-Fa will continue to bring strong winds and heavy rain to Agrihan, Pagan, and Alamagan until it moves farther to the northwest.  Heavy rain is likely to cause flash floods in some locations.

Typhoon In-Fa Moves Toward Northern Marianas

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Typhoon In-Fa continued to move toward the Northern Marianas on Wednesday.  At 11:00 p.m. EDT on Wednesday the center of Typhoon In-Fa was located at latitude 16.1°N and longitude 153.8°E which put the center about 565 miles (910 km) east of Saipan.  In-Fa was moving toward the west-northwest at 18 m.p.h. (30 km/h).  The maximum sustained wind speed was 130 m.p.h. (210 km/h) and there were wind gusts to 160 m.p.h. (260 km/h).  The minimum surface pressure was 951 mb.

Typhoon In-Fa did not change much on Wednesday.  A circular eye with a diameter of 40 miles (65 km) was at the center of In-Fa’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 In-Fa.  Storms near the center of In-Fa generated upper level divergence that pumped mass away from the typhoon.  The removal of mass in the upper levels was nearly equal to the convergence of mass in the lower levels of the atmosphere.  So, the surface pressure did not change much on Wednesday.

The distribution of wind speeds in Typhoon In-Fa was very symmetrical.  Winds to typhoon force extended out 50 miles (80 km) from the center of In-Fa’s circulation.  Winds to tropical storm force extended out 125 miles (200 km) from the center of Typhoon In-Fa.

The Hurricane Intensity Index (HII) for Typhoon In-Fa is 25.1.  The Hurricane Size Index (HSI) is 18.1 and the Hurricane Wind Intensity Size Index (HWISI) is 43.2.  Typhoon In-Fa is similar in size to Hurricane Ian when Ian hit Southwest Florida in 2022.  In-Fa is not as strong as Ian was.

Typhoon In-Fa will move through an environment that will be favorable for a strong typhoon during the next 24 hours.  In-Fa will move over water where the Sea Surface Temperatures are near 29°C.  It will move through a region where the upper level winds are weak and there will be little vertical wind shear.  Typhoon In-Fa appears to be in a near equilibrium with its environment.  In-Fa is likely to maintain its intensity during the next 24 hours.

Typhoon In-Fa will move around the southern part of a high pressure system that is over the Western North Pacific Ocean.  The high pressure system will steer In-Fa toward the west-northwest during the next 24 hours.  On its anticipated track, Typhoon In-Fa will approach Alamagan, Pagan, and Agrihan in 24 hours.

Typhoon In-Fa will be the equivalent of a major hurricane when it reaches Alamagan, Pagan, and Agrihan.  In-Fa will bring strong winds and heavy rain to those islands.  Heavy rain is likely to cause flash floods.

Vance Weakens to a Tropical Depression

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Former Tropical Storm Vance weakened to a tropical depression on Wednesday afternoon.  At 5:00 p.m. EDT on Wednesday the center of Tropical Depression Vance was located at latitude 20.1°N and longitude 109.1°W which put the center about 220 miles (355 km) west of Cabo Corrientes, Mexico.  Vance was moving toward the north at 9 m.p.h. (15 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 1006 mb.

Former Tropical Storm Vance weakened to a tropical depression on Wednesday afternoon.  An upper level trough that was west of Baja California was producing strong southwesterly winds that were blowing across the top of Vance’s circulation.  Those winds were causing strong vertical wind shear.

The strong vertical wind shear was causing the distribution of thunderstorms in Tropical Depression Vance to be very asymmetrical.  Thunderstorms were still occurring in bands in the northeastern part of Vance’s circulation.  Bands in the other parts of Tropical Depression Vance consisted primarily of showers and lower clouds.

Storms near the center of Vance generated upper level divergence that pumped mass away to the northeast of the tropical depression.  The removal of mass in the upper levels was less than the convergence of mass in the lower levels of the atmosphere.  So, the surface pressure increased on Wednesday.

Tropical Depression Vance will move through an environment that will be unfavorable for intensification during the next 24 hours.  Vance will move over water where the Sea Surface Temperatures are near 29°C.  However, the upper level trough that is west of Baja California will continue to cause strong vertical wind shear.  Tropical Depression Vance will continue to weaken on Thursday because of the strong vertical wind shear.

Tropical Depression Vance will move around the western end of a high pressure system that is over Mexico.  The high pressure system will steer Vance slowly toward the north-northeast during the next 24 hours.  On its anticipated track, Tropical Depression Vance will move toward the west coast of Mexico.

Tropical Cyclone Arnab Drops Heavy Rain on Andhra Pradesh

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Tropical Cyclone Arnab dropped heavy rain on Andhra Pradesh as it moved inland on Wednesday.  At 5:00 a.m. EDT on Wednesday the center of Tropical Cyclone Arnab was located at latitude 16.7°N and longitude 81.8°E which put the center about 20 miles (30 km) south of Rajamahendravaram, India.  Arnab was moving toward the north-northwest at 5 m.p.h. (8 km/h).  The maximum sustained wind speed was 65 m.p.h. (150 km/h) and there were wind gusts to 80 m.p.h. (130 km/h).  The minimum surface pressure was 988 mb.

Tropical Cyclone Arnab was moving slowly inland over Andhra Pradesh on Wednesday.  Arnab made landfall on the east coast of India near the Mouths of the Godavari River.  There were reports of flooding and fatalities in parts of Andhra Pradesh.

The strongest winds in Tropical Cyclone Arnab were occurring in the eastern and southwestern parts of Arnab’s circulation that were still over the Bay of Bengal.  Winds to tropical storm force extended out 80 miles (130 km) in the eastern and southwestern parts of Tropical Cyclone Arnab.  The winds in the northwestern part of Arnab’s circulation, which was over land, were blowing at less than tropical storm force.

Tropical Cyclone Arnab will move around the western part of a high pressure system that is over the Bay of Bengal.  The high pressure system will steer Arnab toward the nroth during the next 24 hours.  On its anticipated track, Tropical Cyclone Arnab will move farther inland over northern Andhra Pradesh and southern Madhya Pradesh.

Tropical Cyclone Arnab will gradually weaken as it moves farther inland.  Arnab will continue to drop heavy rain over northern Andhra Pradesh, southern Madhya Pradesh, and Odisha.  Heavy rain is likely to cause additional flash flooding in the region.