Tag Archives: Yap

Tropical Storm Jangmi Forms West of Yap

Tropical Storm Jangmi formed over the Western North Pacific Ocean west of Yap on Tuesday night.  At 5:00 a.m. EDT on Wednesday the center of Tropical Storm Jangmi was located at latitude 9.9°N and longitude 137.3°E which put the center about 40 miles (65 km) west of Yap.  Jangmi was moving toward the north-northwest at 5 m.p.h. (8 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 1000 mb.

A low pressure system over the Western North Pacific Ocean west of Yap strengthened on Tuesday night and the Japan Meteorological Agency designated the system as Tropical Storm Jangmi.

The circulation around Tropical Storm Jangmi was large.  Thunderstorms were occurring in bands in the western side of Jangmi’s circulation.  Thunderstorms were also occurring in a band in the eastern periphery of Tropical Storm Jangmi.  Other bands in the eastern side of Jangmi’s circulation consisted primarily of showers and lower clouds.  Storms near the center of Jangmi generated upper level divergence that pumped mass away from the tropical storm.  The removal of mass caused the surface pressure to decrease.

The circulation around Tropical Storm Jangmi was large.  Winds to tropical storm force extended out 150 miles (240 km) from the center of Jangmi’s circulation.

Tropical Storm Jangmi will move through an environment favorable for intensification during the next 24 hours.  Jangmi 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 east of the Philippines.  The upper level winds are weak near the middle of the ridge and there will be little vertical wind shear.  Tropical Storm Jangmi will intensify during the next 24 hours.  The large circulation around Jangmi could cause it to intensify slowly at first.  Jangmi could strengthen to a typhoon by the weekend.

Tropical Storm Jangmi 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 Jangmi toward the north-northwest during the next 24 hours.  On its anticipated track, Tropical Storm Jangmi will move slowly away from Yap.  Jangmi could approach the Ryukyu Islands in a few days.

Tropical Storm Jangmi will continue to bring gusty winds and heavy rain to Yap until it moves farther away later this week.  Heavy rain could cause flash floods in some locations.

Tropical Storm Hagupit Produces Gusty Winds on Yap

Tropical Storm Hagupit produced gusty winds on Yap on Friday.  At 5:00 p.m. EDT on Friday the center of Tropical Storm Hagupit was located at latitude 8.8°N and longitude 136.6°E which put the center about 90 miles (145 km) southwest of Yap.  Hagupit was moving toward the west at 10 m.p.h. (16 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 1002 mb.

Even though the center of Tropical Storm Hagupit passed south of Yap on Friday, Hagupit still produced gusty winds on Yap.  A weather station at the Yap International Airport (PTYA) reported a wind gust of 40 m.p.h. (65 km/h) on Friday.

Tropical Storm Hagupit weakened a little on Friday.  Some of the thunderstorms in bands in the western half of Hagupit’s circulation dissipated.  Numerous thunderstorms were still occurring in bands in the eastern side of Tropical Storm Hagupit.  Thunderstorms near the center of Hagupit generated a little less upper level divergence that pumped less mass away from the tropical storm.  The removal of less mass caused the surface pressure to increase.

The strongest winds were occurring in the northeastern part of Tropical Storm Hagupit.  Winds to tropical storm force extended out 85 miles (135 km) in the northeastern quadrant of Hagupit’s circulation.  The winds in the other parts of Tropical Storm Hagupit were blowing at less than tropical storm force.

Tropical Storm Hagupit will move into an environment that will become more unfavorable for intensification during the next 24 hours.  Hagupit will move over water where the Sea Surface Temperatures are near 29°C.  It will move under the southern end of an upper level trough that is south of Japan.  The upper level trough will produce westerly winds that will blow toward the top of Hagupit’s circulation.  Those winds will cause the vertical wind shear to increase.  Tropical Storm Hagupit will weaken when the vertical wind shear increases.

Tropical Storm Hagupit will move around the southern side of a high pressure system over the Western North Pacific Ocean.  The high pressure system will steer Hagupit toward the west-northwest during the next 24 hours.  On its anticipated track, Tropical Storm Hagupit will move away from Yap.  Hagupit will pass north of Palau during the weekend.

Tropical Storm Hagupit will continue to produce gusty winds on Yap during the next few hours until Hagupit moves farther away,  Hagupit will also bring passing showers and thunderstorms to Yap.  Locally heavy rainfall could cause flash floods in some locations.

Tropical Storm Hagupit Approaches Yap

Tropical Storm Hagupit was approaching Yap on Thursday night.  At 11:00 p.m. EDT on Thursday the center of Tropical Storm Hagupit was located at latitude 8.6°N and longitude 139.5°E which put the center about 145 miles (230 km) east-southeast of Yap.  Hagupit was moving toward the west-northwest at 15 m.p.h. (24 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. (80 km/h).  The minimum surface pressure was 999 mb.

Tropical Storm Hagupit was intensifying as it approached Yap on Thursday night.  More thunderstorms were developing near the center of Hagupit’s circulation.  Bands of showers and thunderstorms were revolving around the center of Tropical Storm Hagupit.  Storms near the center of Hagupit generated more upper level divergence that pumped mass away from the tropical storm.  The removal of more mass caused the surface pressure to decrease.

Even though Tropical Storm Hagupit was intensifying, the distribution of wind speeds continued to be asymmetrical.  Winds to tropical storm force extended out 110 miles (175 km) in the northern side of Hagupit’s circulation.  The winds in the southern half of Tropical Storm Hagupit were blowing at less that tropical storm force.

Tropical Storm Hagupit will move through an environment favorable for intensification during the next 24 hours.  Hagupit 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 that is over the Western North Pacific Ocean.  The upper level ridge will produce easterly winds that will blow toward the top of Hagupit’s circulation.  Those winds will cause some vertical wind shear, but the wind shear will not be enough to prevent intensification.  Tropical Storm Hagupit will intensify during the next 24 hours.

Tropical Storm Hagupit will move around the southern side of a high pressure system over the Western North Pacific Ocean.  The high pressure system will steer Hagupit toward the west-northwest during the next 24 hours.  On its anticipated track, Tropical Storm Hagupit will reach Yap within 12 hours.

Tropical Storm Hagupit will bring strong winds and locally heavy rain to Yap.  Heavy rain could cause flash floods in some locations.  Tropical Storm Hagupit could cause a storm surge of up to 6 feet (1.8 meters) along the coast of Yap.

Tropical Storm Hagupit Passes South of Guam

Tropical Storm Hagupit passed well to the south of Guam on Wednesday night.  At 5:00 a.m. EDT on Thursday the center of Tropical Storm Hagupit was located at latitude 7.2°N and longitude 142.5°E which put the center about 355 miles (575 km) east-southeast of Yap.  Hagupit was moving toward the west at 9 m.p.h. (15 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 1001 mb.

Tropical Storm Hagupit exhibited a little more organization on Thursday morning.  Thunderstorms were once again forming in bands in all parts of Hagupit’s circulation.  Thunderstorms near the center of Hagupit generated more upper level divergence that pumped mass away from the tropical storm.  The removal of more mass caused the surface pressure to decrease slightly.

Even though Tropical Storm Hagupit looked more organized on satellite images, the distribution of wind speeds continued to be asymmetrical.  Winds to tropical storm force extended out 115 miles (185 km) in the northern side of Hagupit’s circulation.  The winds in the southern half of Tropical Storm Hagupit were blowing at less that tropical storm force.

Tropical Storm Hagupit will move through an environment favorable for intensification during the next 24 hours.  Hagupit 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 that is over the Western North Pacific Ocean.  The upper level ridge will produce easterly winds that will blow toward the top of Hagupit’s circulation.  Those winds will cause some vertical wind shear, but the wind shear will not be enough to prevent intensification.  Tropical Storm Hagupit will intensify slowly during the next 24 hours.

Tropical Storm Hagupit will move around the southern side of a high pressure system over the Western North Pacific Ocean.  The high pressure system will steer Hagupit toward the west-northwest during the next 24 hours.  On its anticipated track, Tropical Storm Hagupit will approach Yap in 24 hours.

Tropical storm Hagupit will bring strong winds and locally heavy rain to Yap.  Heavy rain could cause flash floods in some locations.

Depression Strengthens to Tropical Storm Hagupit

Former Tropical Depression 05W strengthened to Tropical Storm Hagupit over the Western North Pacific Ocean south of the Marianas on Tuesday night.  At 5:00 a.m. EDT on Wednesday the center of Tropical Storm Hagupit was located at latitude 7.4°N and longitude 146.5°E which put the center about 435 miles (705 km) south-southeast of Guam.  Hagupit was moving toward the west at 7 m.p.h. (11 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 1003 mb.

Former Tropical Depression 05W strengthened on Tuesday night and the Japan Meteorological Agency designated the system as Tropical Storm Hagupit.

Thunderstorms continued to develop near the center of Tropical Storm Hagupit.  However, the distribution of thunderstorms around the rest of Hagupit’s circulation became a little more asymmetrical during the past 12 hours.  Thunderstorms were still occurring in bands in the eastern side of Tropical Storm Hagupit.  Bands in the western side of Hagupit’s circulation consisted primarily of showers and lower clouds.  Storms near the center of Hagupit generated some upper level divergence that pumped mass away from the tropical storm.  The removal of mass in the upper levels was nearly matched by the inflow of mass in the lower levels of the atmosphere.  So, the surface pressure was not changing much.

The distribution of wind speeds in Tropical Storm Hagupit was also asymmetrical.  Winds to tropical storm force extended out 100 miles (160 km) in the northeastern quadrant of Hagupit’s circulation.  The winds in the other parts of Tropical Storm Hagupit were blowing at less than tropical storm force.

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

Tropical Storm Hagupit will move around the southern side of a high pressure system over the Western North Pacific Ocean.  The high pressure system will steer Hagupit toward the west during the next 24 hours.  On its anticipated track, Tropical Storm Hagupit will pass south of Guam.  Hagupit could approach Yap in 48 hours.  Hagupit will likely be a tropical storm when it approaches Yap.

Tropical Depression 05W Forms Southeast of the Marianas

Tropical Depression 05W formed over the Western North Pacific Ocean southeast of the Marianas on Tuesday.  At 5:00 p.m. EDT on Tuesday the center of Tropical Depression 05W was located at latitude 8.4°N and longitude 147.8°E which put the center about 100 miles (160 km) north-northwest of Puluwat.  Tropical Depression 05W 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 1003 mb.

A low pressure system over the Western North Pacific Ocean southeast of the Marianas strengthened on Tuesday.  Both the Japan Meteorological Agency and the U.S. Joint Typhoon Warning Center designated the system as a tropical depression.

More thunderstorms formed near the center of Tropical Depression 05W on Tuesday afternoon.  More thunderstorms also developed in bands revolving around the center of the tropical depression.  Storms near the center of circulation started to generate upper level divergence that pumped mass away from the tropical depression.  The removal of mass caused the surface pressure to decrease.

Tropical Depression 05W will move through an environment favorable for intensification during the next 24 hours.  The tropical depression 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 that is over the Western North Pacific Ocean.  The upper level ridge will produce easterly winds that will blow toward the top of the tropical depression.  Those winds will cause some vertical wind shear, but the wind shear will not be enough to prevent intensification.  Tropical Depression 05W will intensify to a tropical storm during the next 24 hours.  It could strengthen to a typhoon later this week.

Tropical Depression 05W will move around the southern side of a high pressure system over the Western North Pacific Ocean.  The high pressure system will steer the tropical depression toward the west during the next 24 hours.  On its anticipated track, Tropical Depression 05W will pass south of Guam.  The tropical depression could approach Yap in 36 hours.  It will likely be a tropical storm when it approaches Yap.

Tropical Storm Nuri Meanders North of Yap

Tropical Storm Nuri meandered north of Yap on Wednesday.  At 5:00 p.m. EDT on Wednesday the center of Tropical Storm Nuri was located at latitude 11.0°N and longitude 138.8°E which put the center about 105 miles (165 km) north-northeast of Yap.  Nuri was moving toward the east-northeast at 7 m.p.h. (11 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 1000 mb.

Tropical Storm Nuri struggled in a hostile environment on Wednesday.  An upper level ridge that was southeast of the Marianas produced strong southwesterly winds that blew across the top of Nuri’s circulation.  Those winds caused strong vertical wind shear.  Those winds also blew the tops off of thunderstorms near the center of Nuri’s circulation.  A few thunderstorms were still occurring in bands in the eastern periphery of Tropical Storm Nuri.  Bands in the other parts of Nuri’s circulation consisted primarily of showers and lower clouds.

Tropical Storm Nuri will move through an environment that will be unfavorable for intensification during the next 24 hours.  Nuri will move over water where the Sea Surface Temperatures are near 29°C.   However, the upper level ridge that is southeast of the Marianas will continue to produce strong southwesterly winds that will blow across the top of Nuri’s circulation.  Those winds will cause strong vertical wind shear.  In addition, Tropical Storm Nuri will be just to the south of a large area of drier air that originated over eastern Asia. The combination of strong vertical wind shear and drier air will cause Tropical Storm Nuri to weaken during the next 24 hours.

Tropical Storm Nuri will move around the western part of a high pressure system that is south of the Marianas.  The high pressure system will steer Nuri toward the east-northeast during the next 24 hours.  On its anticipated track, Tropical Storm Nuri will move toward the Marianas as it weakens.

Tropical Storm Nuri Forms North of Yap

Tropical Storm Nuri formed over the Western North Pacific Ocean north of Yap on Tuesday.  At 5:00 p.m. EDT on Tuesday the center of Tropical Storm Nuri was located at latitude 11.63°N and longitude 138.4°E which put the center about 160 miles (260 km) north of Yap.  Nuri was moving toward the east at 3 m.p.h. (5 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 1000 mb.

A low pressure system over the Western North Pacific Ocean strengthened on Tuesday and the Japan Meteorological Agency designated the system as Tropical Storm Nuri.

Thunderstorms formed near the center of Tropical Storm Nuri on Tuesday.  Even so, the distribution of thunderstorms in Tropical Storm Nuri was asymmetrical.  Most of the thunderstorms were occurring in bands in the northern half of Nuri’s circulation.  Bands in the southern half of Tropical Storm Nuri consisted primarily of showers and lower clouds.  Storms near the center of Nuri started to generate some upper level divergence that pumped mass away to the north and east of the tropical storm.

Tropical Storm Nuri will move through an environment that will be mostly unfavorable for intensification.  Nuri will move over water where the Sea Surface Temperatures are near 29°C.   It will move under the western part of an upper level ridge that is south of the Marianas.  The upper level ridge will produce southerly winds that will blow toward the top of Nuri’s circulation.  Those winds will cause moderate vertical wind shear.  In addition, Tropical Storm Nuri formed just to the south of a large area of drier air that originated over eastern Asia.  The combination of moderate vertical wind shear and drier air is likely to prevent Tropical Storm Nuri from intensifying during the next 24 hours.

Tropical Storm Nuri will move around the western part of a high pressure system that is south of the Marianas.  The high pressure system will steer Nuri toward the east-northeast during the next 24 hours.  On its anticipated track, Tropical Storm Nuri will move toward the Marianas.

Tropical Storm Nuri cold bring gusty winds and locally heavy rain to the Marianas later this week.

Nokaen Strengthens Back to a Tropical Storm

Former Tropical Depression Nokaen strengthened back to a tropical storm over the Western North Pacific Ocean on Monday night.  At 10:00 a.m. EST on Tuesday the center of the Tropical Storm Nokaen was located at latitude 17.4°N and longitude 132.3°E which put the center about 700 miles (1130 km) northwest of Yap.  Nokaen was moving toward the east at 17 m.p.h. (28 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 1000 mb.

After weakening to a tropical depression on Sunday, Nokaen strengthened back to a tropical storm on Monday night.  Thunderstorms developed in several bands in the eastern side of Tropical Storm Nokaen.  Bands in the western side of Nokaen’s circulation still consisted primarily of showers and lower clouds.  The thunderstorms in the eastern side of Nokaen started to generate some upper level divergence that pumped mass away to the east of the tropical storm.

The strongest winds were occurring in the western side of Tropical Storm Nokaen.  Winds to tropical storm force extended out 115 miles (185 km) in the western half of Nokaen’s circulation.  The winds in the the eastern side of Tropical Storm Nokaen were blowing at less than tropical storm force.

Tropical Storm Nokaen will move through an environment that will be unfavorable for intensification during the next 24 hours.  Nokaen will move over water where the Sea Surface Temperatures are near 28°C.  However, it will continue to be surrounded by drier air.  In addition, Tropical Storm Nokaen will move under the southern portion of the midlatitude upper level westerly winds.  Those winds will cause vertical wind shear.  The drier air and the vertical wind shear will prevent Tropical Storm Nokaen from intensifying.

Tropical Storm Nokaen will move around the northwestern part of a high pressure system that is over the Western North Pacific Ocean.  The high pressure system will steer Nokaen toward the east during the next 24 hours.  On its anticipated track, Tropical Storm Nokaen will remain northwest of Yap.

Typhoon Kalmaegi Strikes Central Vietnam

Typhoon Kalmaegi struck central Vietnam on early on Thursday.  At 4:00 a.m. EST on Thursday the center of Typhoon Kalmaegi was located at latitude 13.6°N and longitude 109.9°E which put the center about 50 miles (80 km) southeast of Quy Nohn, Vietnam.  Kalmaegi was moving toward the west-northwest at 17 m.p.h. (28 km/h).  The maximum sustained wind speed was 125 m.p.h. (200 km/h) and there were wind gusts to 155 m.p.h. (250 km/h).  The minimum surface pressure was 951 mb.

The center of Typhoon Kalmaegi made landfall on the coast of central Vietnam near Song Cau early on Thursday.  Kalmaegi was the equivalent of a major hurricane at the time of landfall.  The maximum sustained wind speed was 125 m.p.h. (200 km/h) at the time of landfall.

At the time of landfall winds to typhoon force extended out 45 miles (75 km) from the center of Kalmaegi’s circulation.  Winds to tropical storm force extended out 160 miles (260 km) from the center center of Typhoon Kalmaegi.

The Hurricane Intensity Index (HII) for Typhoon Kalmaegi at the time of landfall was 23.6.  The Hurricane Size Index (HSI) was 18.4 and the Hurricane Wind Intensity Size Index (HWISI) was 42.0.  Typhoon Kalmaegi was similar in size and intensity to Hurricane Milton when Milton hit Florida in 2024.

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 during the next 24 hours.  On its anticipated track, Typhoon Kalmaegi will move inland over central Vietnam during the next few hours.  Kalmaegi will then move near the border between Laos and Cambodia.

Typhoon Kalmaegi will continue to bring strong winds and heavy rain to central Vietnam during the next few hours.  Heavy rain will cause flash floods in some locations.

Typhoon Kalmaegi will weaken steadily as it moves farther inland over Southeast Asia.  Kalmaegi will also drop heavy rain over southern Laos, Cambodia, and northern Thailand.

Elsewhere over the Western North Pacific Ocean, Tropical Storm Fung-wong continued to strengthen gradually east of Yap.  At 4:00 a.m. EST on Thursday the center of Tropical Storm Fung-wong was located at latitude 9.9°N and longitude 140.62E which put the center about 170 miles (280 km) east of Yap.  Fung-wong was moving toward the west-northwest at 3 m.p.h. (5 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 992 mb.  Tropical Storm Fung-wong is forecast to intensify to a typhoon.