Tag Archives: WP29

Typhoon Champi Brings Wind and Rain to Southern Ryukyu Islands

Typhoon Champi brought wind and rain to the southern Ryukyu Islands and to northeastern Taiwan on Friday.  At 11:00 a.m. EDT on Friday the center of Typhoon Champi was located at latitude 25.3°N and longitude 122.6°E which put the center about 75 miles (120 km) east of Taipei, Taiwan.  Champi was moving toward the north-northwest at 16 m.p.h. (16 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 949 mb.

A weather station on Ishigakijima Island reported a sustained wind speed of 78 m.p.h. (125 km/h).  The weather station also reported 4.94 inches (154.0 mm) of rain.

A weather station in Ohara, Japan reported a sustained wind speed of 75 m.p.h. (121 km/h).

A weather station on Yonagunijima Island reported a sustained wind speed of 66 m.p.h. (107 km/h).  The weather station also reported 8.33 inches (211.5 mm) of rain.

Typhoon Champi was the equivalent of a major hurricane on Friday morning.  Winds to typhoon force extended out 85 miles (135 km) from the center of Champi’s circulation.  Winds to tropical storm force extended out 250 miles (400 km) from the center of Typhoon Champi.

The Hurricane Intensity Index (HII) for Typhoon Champi was 20.6.  The Hurricane Size Index (HSI) was 31.8 and the Hurricane Wind Intensity Size Index (HWISI) was 52.4.  Typhoon Champi was similar in intensity to Hurricane Irma when Irma hit south Florida in 2017.  Champi is larger than Irma was.

Typhoon Champi will move around the western end of a high pressure system that is over the Western North Pacific Ocean.  The high pressure system will steer Champi toward the north during the next 24 hours.  On its anticipated track, Typhoon Champi will remain east of China.

Typhoon Champi will move through an environment that will be unfavorable for intensification during the next 24 hours.  Champi will move over water where the Sea Surface Temperatures are near 26°C.  It will move under the eastern side of an upper level trough that is near the east coast of China.  The upper level trough will produce strong southwesterly winds that will blow toward the top of Champi’s circulation.  Those winds will cause strong vertical wind shear.  Champi will also continue to move through a mass of drier air.  Typhoon Champi is likely to weaken steadily during the next 24 hours because of the effects of strong vertical wind shear and drier air.

Elsewhere over the Western North Pacific Ocean, Tropical Depression 30W formed northwest of Kwajalein.  At 11:00 a.m. EDT on Friday the center of Tropical Depression 30W was located at latitude 10.9°N and longitude 166.3°E which put the center about 185 miles (300 km) northwest of Kwajalein.  The tropical depression moving toward the northwest at 2 m.p.h. (3 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 1004 mb.

Typhoon Champi Approaches Southern Ryukyu Islands

Typhoon Champi was approaching the southern Ryukyu Islands on Wednesday evening.  At 11:00 p.m. EDT on Wednesday the center of Typhoon Champi was located at latitude 20.6°N and longitude 125.7°E which put the center about 295 miles (475 km) south-southeast of Ishigakijima, Japan.  Champi was moving toward the west-northwest at 11 m.p.h. (17 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 940 mb.

Typhoon Champi weakened on Wednesday.  Even though Champi weakened, it was still a very well organized typhoon.  A circular eye with a diameter of 35 miles (55 km) was at the center of Champi’s circulation.  Bands of showers and thunderstorms were revolving around the the center of Typhoon Champi.  Storms near the center of Champi 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 Wednesday.

The circulation around Typhoon Champi was large.  Winds to typhoon force extended out 100 miles (160 km) from the center of Champi’s circulation.  Winds to tropical storm force extended out 345 miles (555 km) from the center of Typhoon Champi.

The Hurricane Intensity Index (HII) for Typhoon Champi is 25.1.  The Hurricane Size Index (HSI) is 34.2 and the Hurricane Wind Intensity Size Index (HWISI) is 59.3.  Typhoon Champi is similar in size to Hurricane Ivan when Ivan hit the northern Gulf Coast in 2004.  Champi is stronger than Ivan was.

Typhoon Champi will move through an environment that will be unfavorable for intensification during the next 24 hours.  Champi will move over water where the Sea Surface Temperatures are near 28°C.  It will move under the eastern side of an upper level trough that is near the east coast of China.  The upper level trough will produce southwesterly winds that will blow toward the top of Champi’s circulation.  Those winds will cause the vertical wind shear to increase.   Champi will also move into a region of drier air on Thursday.  Typhoon Champi is likely to weaken during the next 24 hours because of more vertical wind shear and drier air.

Typhoon Champi will move around the western part of a high pressure system that is over the Western North Pacific Ocean. The high pressure system will steer Champi toward the north-northwest during the next 24 hours.  On its anticipated track, the center of Typhoon Champi will be near Ishigakijima in 24 hours.

Typhoon Champi will bring strong winds and heavy rain to the southern Ryukyu Islands.  Heavy rain is likely to cause flash floods in some locations.

Typhoon Champi could also bring strong winds and heavy rain to parts of Taiwan.

Intense Typhoon Champi Churns West

Intense Typhoon Champi churned westward over the Western North Pacific Ocean on Tuesday.  At 5:00 p.m. EDT on Tuesday the center of Typhoon Champi was located at latitude 17.7°N and longitude 130.9°E which put the center about 670 miles (1080 km) south-southeast of Okinawa.  Champi was moving toward the west-northwest at 17 m.p.h. (28 km/h).  The maximum sustained wind speed was 185 m.p.h. (295 km/h) and there were wind gusts to 225 m.p.h. (360 km/h).  The minimum surface pressure was 895 mb.

Intense Typhoon Champi got even stronger on Tuesday.  A circular eye with a diameter of 35 miles (55 km) was at the center of Champi’s circulation.  Bands of showers and thunderstorms were revolving around the the center of Typhoon Champi.  Storms near the center of Champi 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 Champi was large.  Winds to typhoon force extended out 100 miles (160 km) from the center of Champi’s circulation.  Winds to tropical storm force extended out 290 miles (465 km) from the center of Typhoon Champi.

The Hurricane Intensity Index (HII) for Typhoon Champi is 44.1.  The Hurricane Size Index (HSI) is 30.4 and the Hurricane Wind Intensity Size Index (HWISI) is 74.5.  Typhoon Champi is similar in intensity to Hurricane Dorian when Dorian hit the Bahamas in 2019.  Champi is much larger than Dorian was.

Typhoon Champi will move through an environment that will be favorable for an intense typhoon during the next 24 hours.  Champi will move over water where the Sea Surface Temperatures are near 28°C.  It will move through a region where the upper level winds are weak and there will be little vertical wind shear.  Typhoon Champi could maintain its intensity during the next 24 hours unless the inner end of a rainband wraps around the existing eye and eyewall.  If concentric eyewalls form, then an eyewall replacement cycle would cause Champi to weaken.

Typhoon Champi 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 Champi toward the west-northwest during the next 24 hours.  On its anticipated track, Typhoon Champi will continue to move toward Taiwan and the southern Ryukyu Islands.  Champi could approach the southern Ryukyu Islands in 48 hours.

Typhoon Champi Strengthens to Equivalent of Cat. 5 Hurricane

Typhoon Champi strengthened to the equivalent of a Category 5 hurricane on the Saffir-Simpson Scale as it moved over the Western North Pacific Ocean north of Yap on Sunday night.  At 5:00 a.m. EDT on Monday the center of Typhoon Champi was located at latitude 14.6°N and longitude 137.9°E which put the center about 330 miles (535 km) north of Yap.  Champi was moving toward the west-northwest at 9 m.p.h. (15 km/h).  The maximum sustained wind speed was 160 m.p.h. (260 km/h) and there were wind gusts to 105 m.p.h. (315 km/h).  The minimum surface pressure was 917 mb.

Typhoon Champi intensified to the equivalent of a Category 5 hurricane on Saturday night.  A circular eye with a diameter of 30 miles (50 km) was at the center of Champi’s circulation.  Bands of showers and thunderstorms were revolving around the the center of Typhoon Champi.  Storms near the center of Champi generated upper level divergence that pumped mass away from the typhoon.  The removal of mass caused the surface pressure to decrease.

The size of the circulation around Typhoon Champi increased on Sunday.  Winds to typhoon force extended out 65 miles (105 km) from the center of Champi’s circulation.  Winds to tropical storm force extended out 220 miles (350 km) from the center of Typhoon Champi.

The Hurricane Intensity Index (HII) for Typhoon Champi is 35.0.  The Hurricane Size Index (HSI) is 20.8 and the Hurricane Wind Intensity Size Index (HWISI) is 55.8. Typhoon Champi is similar in size and intensity to Hurricane Maria when Maria hit Puerto Rico in 2017.

Typhoon Champi will move through an environment that will be favorable for intensification during the next 24 hours.  Champi will move over water where the Sea Surface Temperatures are near 28°C.  It will move through a region where the upper level winds are weak and there will be little vertical wind shear.  Typhoon Champi could intensify during the next 24 hours unless the inner end of a rainband wraps around the existing eye and eyewall.  If concentric eyewalls form, then an eyewall replacement cycle would cause Champi to weaken.

Typhoon Champi will move around the southern side of a high pressure system that is over the Western North Pacific Ocean.  The high pressure system will steer Champi toward the west-northwest during the next 24 hours.  On its anticipated track, Typhoon Champi will move toward Taiwan and the southern Ryukyu Islands.

Typhoon Champi Brings Wind and Rain to Guam

Typhoon Champi brought wind and rain to Guam on Saturday.  At 5:00 p.m. EDT on Saturday the center of Typhoon Champi was located at latitude 13.2°N and longitude 144.3°E which put the center about 40 miles (65 km) south of Guam.  Champi was moving toward the west-northwest at 16 m.p.h. (26 km/h).  The maximum sustained wind speed was 150 m.p.h. (240 km/h) and there were wind gusts to 185 m.p.h. (295 km/h).  The minimum surface pressure was 934 mb.

Typhoon Warnings are in effect for Guam and Rota,

Tropical Storm Warnings are in effect for Tinian and Saipan.

The core of Typhoon Champi where the strongest winds are occurring passed just to the south of Guam on Saturday.  Bands in the northern side of Champi’s circulation brought strong winds and rain to Guam, Rota, Tinian and Saipan.

A weather station at the Guam International Airport (PGUM) reported a sustained wind speed of 47 m.p.h. (76 km/h) and a wind gust of 72 m.p.h. (116 km/h).

A weather station at Andersen Air Force Base (PGUA) reported a sustained wind speed 0f 46 m.p.h. (74 km/h) and a wind gust of 59 m.p.h. (95 km/h).

Typhoon Champi was the equivalent of a Category 4 hurricane on the Saffir-Simpson Scale.  Winds to typhoon force extended out 60 miles (95 km) from the center of Champi’s circulation.  Winds to tropical storm force extended out 140 miles (225 km) from the center of Typhoon Champi.

The Hurricane Intensity Index (HII) for Typhoon Champi is 31.6.  The Hurricane Size Index (HSI) is 18.6 and the Hurricane Wind Intensity Size Index (HWISI) is 50.2.  Typhoon Champi is similar in size and intensity to Hurricane Laura when Laura hit Southwest Louisiana in 2020.

Typhoon Champi will move around the southern side of a high pressure system that is over the Western North Pacific Ocean.  The high pressure system will steer Champi toward the west-northwest during the next 24 hours.  On its anticipated track, Typhoon Champi will move away from Guam on Sunday.

Typhoon Champi will move through an environment that will be favorable for intensification during the next 24 hours.  Champi 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 the Western North Pacific Ocean.  The upper level ridge will produce easterly winds that will blow toward the top of Champi’s circulation.  Those winds will cause some vertical wind shear.  The vertical wind shear will inhibit intensification, but the wind shear will not be enough to prevent intensification.  Typhoon Champi could intensify during the next 24 hours unless the inner end of a rainband wraps around the existing eye and eyewall.  If concentric eyewalls form and an eyewall replacement cycle occurs, Champi will weaken, at least temporarily.

Typhoon Champi Rapidly Intensified to Equivalent of Major Hurricane

Typhoon Champi rapidly intensified to the equivalent of a major hurricane as it moved closer to Guam on Friday night.  At 5:00 a.m. EDT on Saturday the center of Typhoon Champi was located at latitude 12.6°N and longitude 146.7°E which put the center about 180 miles (295 km) east-southeast of Guam.  Champi was moving toward the west at 15 m.p.h. (24 km/h).  The maximum sustained wind speed was 130 m.p.h. (210 km/h) and there were wind gusts to 155 m.p.h. (250 km/h).  The minimum surface pressure was 948 mb.

Typhoon Warnings are in effect for Guam and Rota,

Tropical Storm Warnings are in effect for Tinian and Saipan.

Typhoon Champi rapidly intensified to the equivalent of a major hurricane on Friday night.  A small circular eye with a diameter of 6 miles (10 km) was at the center of Champi’s circulation. Bands of showers and thunderstorms were revolving around the the center of Typhoon Champi.  Storms near the center of Champi 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 speed became more symmetrical when Typhoon Champi rapidly intensified.  Winds to typhoon force extended out 60 miles (95 km) from the center of Champi’s circulation.  Winds to tropical storm force extended out 130 miles (210 km) from the center of Typhoon Champi.

The Hurricane Intensity Index (HII) for Typhoon Champi is 25.1.  The Hurricane Size Index (HSI) is 18.5 and the Hurricane Wind Intensity Size Index (HWISI) is 43.6.  Typhoon Champi is similar in intensity to Hurricane Harvey when Harvey hit Texas in 2017.  Champi is bigger than Harvey was.

Typhoon Champi will move through an environment that will be favorable for intensification during the next 24 hours.  Champi 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 the Western North Pacific Ocean.  The upper level ridge will produce easterly winds that will blow toward the top of Champi’s circulation.  Those winds will cause some vertical wind shear. The vertical wind shear will inhibit intensification, but the wind shear will not be enough to prevent intensification.  Typhoon Champi will intensify during the next 24 hours.  Champi could strengthen to the equivalent of a Category 5 hurricane on Saturday.

Typhoon Champi will move around the southern side of a high pressure system that is over the Western North Pacific Ocean.  The high pressure system will steer Champi toward the west-northwest during the next 24 hours.  On its anticipated track, Typhoon Champi will reach Guam in less than 12 hours.

Typhoon Champi is could be the equivalent of a Category 5 hurricane when it reaches Guam.  Champi will bring strong winds and heavy rain to Guam, Rota, Tinian and Saipan.  The strongest winds and heaviest rain are likely to affect Guam and Rota.  Typhoon Champi will be capable of causing severe damage in Guam.  Heavy rain is likely to cause flash floods in some locations.

Flood Watches are in effect for Guam, Rota, Tinian and Saipan.

Champi Strengthens to a Typhoon East of Guam

Former Tropical Storm Champi strengthened to a typhoon east of Guam on Friday.  At 5:00 p.m. EDT on Friday the center of Typhoon Champi was located at latitude 12.0°N and longitude 149.6°E which put the center about 375 miles (610 km) east-southeast of Guam.  Champi was moving toward the west-northwest at 15 m.p.h. (24 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 984 mb.

Typhoon Warnings are in effect for Guam and Rota,

Tropical Storm Warnings are in effect for Tinian and Saipan.

Former Tropical Storm Champi strengthened to a typhoon on Friday.  The inner end of a rainband wrapped around the center of Typhoon Champi.  A small circular eye formed at the center of Champi’s circulation.  Bands of showers and thunderstorms were revolving around the the center of Typhoon Champi.  Storms near the center of Champi generated upper level divergence that pumped mass away from the typhoon.  The removal of mass caused the surface pressure to decrease.

The strongest winds were occurring in the northern side of Typhoon Champi.  Winds to typhoon force extended out 30 miles (50 km) in the northern half of Champi’s circulation.  Winds to tropical storm extended out 100 miles (160 km) from the center of Typhoon Champi.

Typhoon Champi will move through an environment that will be favorable for intensification during the next 24 hours.  Champi 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 the Western North Pacific Ocean.  The upper level ridge will produce easterly winds that will blow toward the top of Champi’s circulation.  Those winds will cause some vertical wind shear. The vertical wind shear will inhibit intensification, but the wind shear will not be enough to prevent intensification.  Typhoon Champi will intensify during the next 24 hours.  Champi could strengthen to the equivalent of a major hurricane on Saturday.

Typhoon Champi will move around the southern side of a high pressure system that is over the Western North Pacific Ocean.  The high pressure system will steer Champi toward the west-northwest during the next 24 hours.  On its anticipated track, Typhoon Champi will reach Guam in 24 hours.

Typhoon Champi is could be the equivalent of a major hurricane when it reaches Guam.  Champi is likely to bring strong winds and heavy rain to Guam, Rota, Tinian and Saipan.  The strongest winds and heaviest rain are likely to affect Guam and Rota.  Heavy rain is likely to cause flash floods in some locations.

Flood Watches are in effect for Guam, Rota, Tinian and Saipan.

Tropical Storm Champi Forms east of Guam

Tropical Storm Champi formed over the Western North Pacific Ocean east of Guam on Thursday.  At 5:00 p.m. EDT on Thursday the center of Tropical Storm Champi was located at latitude 11.6°N and longitude 155.8°E which put the center about 795 miles (1285 km) east of Guam.  Champi was moving toward the west-northwest at 12 m.p.h. (19 km/h).  The maximum sustained wind speed was 45 m.p.h. (75 km/h) and there were wind gusts to 60 m.p.h. (95 km/h).  The minimum surface pressure was 999 mb.

Typhoon Watches are in effect for Guam, Rota, Tinian, and Saipan.

A low pressure system over the Western North Pacific Ocean east of Guam strengthened on Thursday and the Japan Meteorological Agency designated the system as Tropical Storm Champi.

Even though Tropical Storm Champi was strengthening on Thursday, the distribution of thunderstorms in Champi was asymmetrical.  Thunderstorms were occurring in bands in the western and southern parts of Champi’s circulation.  Bands in the eastern and southern parts of Tropical Storm Champi consisted primarily of showers and lower clouds.  Storms near the center of Champi began to generate upper level divergence that pumped mass away to the west of the tropical storm.  The removal of mass caused the surface pressure to start to decrease.

The distribution of wind speeds in Tropical Storm Champi was also asymmetrical.  Winds to tropical storm force extended out 85 miles (135 km) in the southern half of Champi’s circulation.  The winds in the northern part of Tropical Storm Champi were blowing at less than tropical storm force.

Tropical Storm Champi will move through an environment that will be favorable for intensification during the next 24 hours.  Champi 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 the Western North Pacific Ocean.  The upper level ridge will produce easterly winds that will blow toward the top of Champi’s circulation.  Those winds will cause some vertical wind shear.  The vertical wind shear will inhibit intensiciation, but the wind shear will not be enough to prevent intensification.  Tropical Storm Champi will intensify during the next 24 hours.  Champi could strengthen to a typhoon by Friday night.

Tropical Storm Champi will move around the southern side of a high pressure system that is over the Western North Pacific Ocean.  The high pressure system will steer Champi toward the west-northwest during the next 24 hours.  On its anticipated track, Tropical Storm Champi will move toward the Marianas.  Champi could reach the Marianas in 48 hours.

Tropical Storm Champi is likely to be a typhoon when it reaches the Marianas.  Champi is likely to bring strong winds and heavy rain to Guam, Rota, Tinian and Saipan.  Heavy rain is likely to cause flash floods in some locations.

Tropical Storm Nakri Moves Away from Japan

Tropical Storm Nakri moved away from Japan on Monday.  At 5:00 p.m. EDT on Monday the center of Tropical Storm Nakri was located at latitude 34.3°N and longitude 149.1°E which put the center about 460 miles (740 km) east of Tokyo, Japan.  Nakri was moving toward the east at 23 m.p.h. (37 km/h).  The maximum sustained wind speed was 70 m.p.h. (110 km/h) and there were wind gusts to 85 m.p.h. (135 km/h).  The minimum surface pressure was 985 mb.

Former Typhoon Nakri weakened back to a tropical storm on Monday as it quickly moved farther away from Japan.  Nakri was still a very well organized tropical storm.  The inner end of a rainband wrapped most of the way around the center of Nakri’s circulation.  Bands of showers and thunderstorms revolved around the center of Tropical Storm Nakri.  Storms near the center of Nakri generated upper level divergence that pumped mass away to the east of the tropical storm.

The distribution of winds speeds around Tropical Storm Nakri was fairly symmetrical.  Winds to tropical storm force extended out 155 miles (250 km) from the center of Nakri’s circulation.

Tropical Storm Nakri will move through an environment that will be unfavorable for intensification of a tropical cyclone during the next 24 hours.  Nakri will move over water where the Sea Surface Temperatures are near 25°C.  It will move under the southeastern part of an upper level trough that is over northern Japan.  The upper level trough will produce westerly winds that will blow toward the top of Nakri’s circulation.  Those winds will cause strong vertical wind shear.  Cooler Sea Surface Temperatures and strong vertical wind shear will cause Tropical Storm Nakri to weaken during the next 24 hours.  The cooler Sea Surface Temperatures and strong vertical wind shear will also cause Nakri to make a transition to an extratropical cyclone.

The upper level trough over northern Japan will steer Tropical Storm Nakri quickly toward the east during the next 24 hours.  On its anticipated track, Tropical Storm Nakri will continue to move quickly away from Japan.

Nakri Strengthens to a Typhoon

Former Tropical Storm Nakri strengthened to a typhoon south of Japan on Sunday.  At 11:00 a.m. EDT on Sunday the center of Tropical Storm Nakri was located at latitude 32.0°N and longitude 137.4°E which put the center about 285 miles (460 km) southwest of Tokyo, Japan.  Nakri was moving toward the east-northeast at 16 m.p.h. (26 km/h).  The maximum sustained wind speed was 75 m.p.h. (120 km/h) and there were wind gusts to 90 m.p.h. (145 km/h).  The minimum surface pressure was 982 mb.

Former Tropical Storm Nakri strengthened to a typhoon south of Japan on Sunday.  A small circular eye was present at the center of Typhoon Nakri.  The eye was surrounded by a ring of thunderstorms and the strongest winds were occurring in that ring of storms.  Thunderstorms were also occurring in bands in the northern and eastern parts of Nakri’s circulation.  Bands in the southern and western sides of Typhoon Nakri consisted primarily of showers and lower clouds.  Storms near the center of Nakri generated upper level divergence that pumped mass away to the east of the typhoon.

Winds to typhoon force extended out 15 miles (25 km) from the center of Typhoon Nakri.  Winds to tropical storm force extended out 110 miles (175 km) in the eastern half of Nakri’s circulation.  Winds to tropical storm force only extended out 45 miles (75 km) in the western side of Typhoon Nakri.

Typhoon Nakri will move through an environment favorable for intensification during the next 24 hours.  Nakri will move over water where the Sea Surface Temperatures are near 28°C.  It will move under the eastern side of an upper level trough that is west of Japan.  The upper level trough will produce westerly winds that will blow toward the top of Nakri’s circulation.  However, the winds in the lower atmosphere will also blow from the west.  So, there will not be a lot of vertical wind shear. Typhoon Nakri is likely to intensify during the next 24 hours.

The upper level trough that is west of Japan will steer Typhoon Nakri toward the east-northeast during the next 24 hours.  On its anticipated track, Typhoon Nakri will pass south of Tokyo in 12 hours.