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Tropical Storm Douglas Moves Away from Hawaii

A weakening Tropical Storm Douglas moved away from Hawaii on Monday.  At 11:00 p.m. EDT on Monday the center of Tropical Storm Douglas was located at latitude 22.9°N and longitude 163.3°W which put it about 200 miles (325 km) east-southeast of French Frigate Shoals.  Douglas was moving toward the west at 18 m.p.h. (30 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 993 mb.

Tropical Storm Douglas weakened on Monday.  An upper level trough west of Hawaii produced southerly winds which blew toward the top of Douglas’ circulation.  Those winds caused strong vertical wind shear.  The wind shear caused former Hurricane Douglas to weaken even though it was moving over water where the Sea Surface Temperature was near 27°C.  The low level center of circulation was surrounded by showers and lower clouds.  The only thunderstorms were occurring on the northern periphery of the tropical storm.  Bands in the other parts of Douglas consisted of showers and lower clouds.  Winds to tropical storm force extended out about 100 miles (160 km) from the center of circulation.

Tropical Storm Douglas will move south of a subtropical high pressure system over the North Pacific Ocean.  The high will steer Douglas toward the west during the next few days.  On its anticipated track Tropical Storm Douglas will move across the International Date Line and over the Western North Pacific Ocean later this week.  The upper level trough will continue to cause vertical wind shear and Douglas will continue to weaken.

Hurricane Douglas Passes Just North of Hawaii

Hurricane Douglas was passing just to the north of the Hawaiian Islands on Sunday night.  At 11:00 p.m. EDT on Sunday night the center of Hurricane Douglas was located at latitude 22.0°N and longitude 157.3°W which put it about 60 miles (95 km) northeast of Honolulu, Hawaii.  Douglas was moving toward the west-northwest at 16 m.p.h. (26 km/h).  The maximum sustained wind speed was 85 m.p.h. (135 km/h) and there were wind gusts to 100 m.p.h. (160 km/h).  The minimum surface pressure was 989 mb.

Hurricane Warnings were in effect for Oahu, Kauai and Niihau.

The core of Hurricane Douglas exhibited greater organization on Sunday night.  Thunderstorms around the eye at the center of Douglas grew taller as the hurricane moved over warmer water.  Bands of showers and thunderstorms were revolving around the core.  Winds to hurricane force extended out about 40 miles (65 km) from the center of circulation.  Winds to tropical storm force extended out 115 miles (185 km) from the center in the northern half of Hurricane Douglas.  Winds to tropical storm force only extended out about 50 miles (80 km) on the southern side of the circulation.  The stronger winds were remaining north of the Hawaiian Islands.  There were reports of localized minor wind damage on some of the islands.

Hurricane Douglas will move around the south side of a subtropical high pressure system over the North Pacific Ocean.  The high will steer Douglas toward the west-northwest during the next several days.  On its anticipated track the core of Hurricane Douglas will pass north of Oahu.  Scattered minor wind damage could occur on Oahu, Kauai and Niihau.  The southern part of the eyewall could come closer to Kauai and the risk for wind damage is greater there.  Winds blowing uphill could enhance rainfall on Oahu, Kauai and Niihau.  Flash Flood Watches were in effect for those islands.

Hurricane Douglas Prompts Hurricane Warning for Oahu

The approach of Hurricane Douglas prompted the issuance of a Hurricane Warning for Oahu on Saturday afternoon.  At 5:00 p.m. EDT on Saturday the center of Hurricane Douglas was located at latitude 19.5°N and 150.1°W which put it about 325 miles (525 km) east of Hilo, Hawaii.  Douglas was moving toward the west-northwest at 18 m.p.h. (30 km/h).  The maximum sustained wind speed was 90 m.p.h. (150 km/h) and there were wind gusts to 110 m.p.h. (175 km/h).  The minimum surface pressure was 984 mb.

A Hurricane Warning was in effect for Oahu.  Hurricane Watches were in effect for Hawaii, Maui, Lanai, Molokai and Kahoolawe.  Tropical Storm Warnings were in effect for Hawaii, Maui, Lanai, Molokai and Kahoolawe.  Tropical Storm Watches were in effect for Kauai and Niihau.

Hurricane Douglas weakened gradually on Saturday as it moved over cooler water.  Douglas was moving over water where the Sea Surface Temperature was near 25°C.  As a result of the cooler water, thunderstorms did not grow as high in the atmosphere.  There was still an eye at the center of circulation, but breaks began to appear in the ring of storms around the eye.  Most of the stronger thunderstorms were in the northern half of the circulation.  Bands in the southern half of the circulation consisted mainly of showers and lower clouds.   Winds to hurricane force extended out about 30 miles (50 km) from the center of circulation.  Winds to tropical storm force extended out about 110 miles (175 km) from the center.

Hurricane Douglas will move around the southern side of a subtropical high pressure system over the North Pacific Ocean.  The high will steer Douglas toward the west-northwest during the next several days.  On its anticipated track Hurricane Douglas will pass north of the Big Island of Hawaii on Sunday morning.  The core of Douglas could pass near Oahu on Sunday night.

Hurricane Douglas will bring gusty winds to the Hawaiian Islands.  The strongest winds could occur on Oahu.  Winds speeds will be greater at higher elevations.  Douglas could drop heavy rain on the sides of the islands where the wind blows up the slopes.  Flash flooding will be possible.

Hurricane Douglas Prompts Watches for Hawaii

Hurricane Douglas prompted the issuance of Hurricane Watches for some of the Hawaiian Islands on Friday afternoon.  At 5:00 p.m. EDT on Friday the center of Hurricane Douglas was located at latitude 17.0°N and longitude 143.5°W which put it about 785 miles (1260 km) east of Hilo, Hawaii.  Douglas was moving toward the west-northwest at 18 m.p.h. (30 km/h).  The maximum sustained wind speed was 115 m.p.h. (185 km/h) and there were wind gusts to 140 m.p.h. (225 km/h).  The minimum surface pressure was 967 mb.

Hurricane Watches were issued for Hawaii, Maui, Lanai, Molokai and Kahoolawe.

Hurricane Douglas continued on a track toward the Hawaiian Islands on Friday, which prompted the issuance of Hurricane Watches.  Douglas was weakening slowly as it moved over slightly cooler water.  In addition, Hurricane Douglas appeared to go through an eyewall replacement cycle which may have contributed to the weakening.  Even though it had weakened, Douglas remained a powerful, well organized hurricane.  There was a circular eye at the center of circulation.  The eye was surrounded by a ring of strong thunderstorms and the strongest winds were occurring in that ring of storms.  Bands of showers and thunderstorms were revolving around the core of Hurricane Douglas.  Storms near the core were generating upper level divergence which was pumping mass away from the hurricane.

Winds to hurricane force extended out 25 miles (40 km) from the center of circulation.  Winds to tropical storm force extended out 120 miles (195 km) from the center of Douglas.  The Hurricane Intensity Index (HII) for Hurricane Douglas was 20.6.  The Hurricane Size Index (HSI) was 9.9 and the Hurricane Wind Intensity Size Index (HWISI) was 30.5.  Hurricane Douglas was capable of causing localized major damage.

Hurricane Douglas will move through an environment less favorable for major hurricanes during the next several days.  Douglas will move over water where the Sea Surface Temperature is near 25°C.  So, Hurricane Douglas will not be able to extract as much energy from the upper ocean.  It will move through a region where the upper level winds are weak and there will be little vertical wind shear.  The lack of wind shear will allow Hurricane Douglas to weaken gradually.

Hurricane Douglas will move south of a subtropical high pressure system over the Eastern and Central North Pacific Ocean.  The high will steer Douglas toward the west-northwest.  On its anticipated track Hurricane Douglas will approach Hawaii on Sunday.

Hurricane Douglas Strengthens to a Major Hurricane

Hurricane Douglas strengthened to a major hurricane on Thursday morning.  At 5:00 a.m. EDT on Thursday the center of Hurricane Douglas was located at latitude 13.1°N and longitude 134.7°W which put it about 1470 miles (2365 km) east-southeast of Hilo, Hawaii.  Douglas was moving toward the west-northwest at 17 m.p.h. (28 km/h).  The maximum sustained wind speed was 120 m.p.h. (195 km/h) and there were wind gusts to 140 m.p.h. (225 km/h).  The minimum surface pressure was 967 mb.

Hurricane Douglas strengthened rapidly into a major hurricane during the past 24 hours.  A circular eye formed at the center of Douglas.  A ring of thunderstorms surrounded the eye and the strongest winds were occurring in that ring of storms.  Bands of showers and thunderstorms were revolving around the core of Hurricane Douglas.  Storms near the core were generating strong upper level divergence which was pumping mass away from the hurricane.  Winds to hurricane force extended out 25 miles (40 km) from the center of circulation.  Winds to tropical storm force extended out 100 miles (160 km) from the center.

Hurricane Douglas will move through an environment favorable for intensification during the next 12 to 24 hours.  Douglas will move over water where the Sea Surface Temperature is near 28°C.  It will move through a region where the upper level winds are weak and there will be little vertical wind shear.  Hurricane Douglas could strengthen on Thursday.  Douglas will start to move over slightly cooler water on Friday.  It is likely to weaken slowly once the core of the circulation moves over the cooler water.

Hurricane Douglas will move south of a subtropical high pressure system over the Eastern North Pacific Ocean.  The high will steer Douglas toward the west-northwest during the next few days.  On its anticipated track Hurricane Douglas could approach Hawaii on Sunday.  Watches could be issued for Hawaii later this week.

Tropical Storm Douglas Strengthens Into a Hurricane

Former Tropical Storm Douglas strengthened into a hurricane east of Hawaii on Wednesday morning.  At 11:00 a.m. EDT on Monday the center of Hurricane Douglas was located at latitude 11.8°N and longitude 129.5°W which put it about 1785 miles (2870 km) east-southeast of Hilo, Hawaii.  Douglas was moving toward the west at 15 m.p.h. (24 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 993 mb.

Former Tropical Storm Douglas exhibited more organization on satellite images.  The inner end of a rainband wrapped around the center of circulation and an eye was visible intermittently on satellite images.  Bands of showers and thunderstorms were revolving around the center of Hurricane Douglas.  Storms near the center were generating upper level divergence which was pumping mass away from the hurricane.  Winds to hurricane force extended out 20 miles (30 km) from the center of circulation.  Winds to tropical storm force extended out 80 miles (130 km) from the center.

Hurricane Douglas will move through an environment favorable for intensification during the next several days.  Douglas will move over water where the Sea Surface Temperature is near 29°C.  It will move through a region where the upper level winds are weak and there will be little vertical wind shear.  Hurricane Douglas will continue to intensify and it could strengthen into a major hurricane.

Hurricane Douglas will move south of a subtropical high pressure system over the Eastern North Pacific Ocean.  The high will steer Douglas toward the west-northwest.  On its anticipated track Hurricane Douglas could approach Hawaii on Sunday.  Watches could be issued for Hawaii later this week when Douglas moves closer.

Tropical Storm Douglas Strengthens Quickly

Tropical Storm Douglas strengthened quickly over the Eastern North Pacific Ocean on Tuesday.  At 11:00 a.m. EDT on Tuesday the center of Tropical Storm Douglas was located at latitude 12.4°N and longitude 124.2°W which put it about 2110 miles (3390 km) east of Hilo, Hawaii.  Douglas was moving toward the west-southwest at 15 m.p.h. (24 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 998 mb.

The circulation around Tropical Storm Douglas exhibited much better organization on Tuesday morning.  The inner end of a rainband wrapped around the southern and eastern sides of the center of circulation.  Bands of showers and thunderstorms were revolving around around the center of Douglas.  The strongest bands were in the southern half of Tropical Storm Douglas.  Storms near the center of circulation were generating upper level divergence which was pumping mass away from the tropical storm.  Winds to tropical storm force extended out about 40 miles (65 km) from the center of Douglas.

Tropical Storm Douglas will move through an environment favorable for intensification during the next several days.  Douglas will move over water where the Sea Surface Temperature is near 29°C.  It will move through a region where the upper level winds are weak and there will be little vertical wind shear.  Tropical Storm Douglas is likely to intensify into a hurricane during the next 24 hours and it could strengthen into a major hurricane later this week.

Tropical Storm Douglas will move south of a subtropical high pressure system over the Eastern North Pacific Ocean.  The high is likely to steer Douglas toward the west-northwest during the next few days.  On its anticipated track Tropical Storm Douglas could approach Hawaii by late in the weekend.

Elsewhere over the Eastern North Pacific Ocean, Tropical Depression Seven-E weakened over cooler water east of Hawaii.  At 11:00 a.m. EDT on Tuesday the center of Tropical Depression Seven-E was located at latitude 19.3°N and longitude 134.1°W which put it about 1575 miles (2535 km) west of the southern tip of Baja California.  The depression was moving toward west at 13 m.p.h. (20 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 1009 mb.

Two Tropical Depressions Form Over Eastern Pacific

Two tropical depressions formed over the Eastern North Pacific Ocean on Monday.  At 11:00 a.m. EDT on Monday the center of Tropical Depression Seven-E was located at latitude 18.7°N and longitude 130.3°E which put it about 1345 miles (2170 km) west of the southern tip of Baja California.  The depression was moving toward the northwest at 13 m.p.h. (20 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 1008 mb.

At 11:00 a.m. EDT on Monday the center of Tropical Depression Eight-E was located at latitude 13.7°N and longitude 119.8°W which put it about 905 miles (1460 km) southwest of the southern tip of Baja California.  The depression was moving toward the west-southwest at 7 m.p.h. (11 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 1008 mb.

The distribution of thunderstorms around Tropical Depression Seven-E was asymmetrical.  The strongest storms were occurring in bands southwest of the center of circulation.  Bands in other parts of the depression consisted primarily of showers and lower clouds.  The depression was already to moving over water where the Sea Surface Temperature was near 25°C.  It was moving under the southwestern part of an upper level ridge which was producing northeasterly winds.  Those winds were blowing toward the top of the depression and they were causing moderate vertical wind shear.  Cooler water and wind shear were contributing to the asymmetrical distribution of thunderstorms.

Tropical Depression Seven-E is likely to weaken since it will continue to move over cooler water.  The depression will move south of a subtropical high pressure system.  The high will steer the depression toward the west while it weakens.  On its anticipated track the depression will weaken long before it could pose a threat to Hawaii.

The distribution of thunderstorms around Tropical Depression Eight-E is also asymmetrical.  Many of the strongest storms were occurring in bands in the western half of the circulation.  Some thunderstorms began to develop in bands in the eastern half of the depression on Monday morning.  Storms on the western side of the circulation began to generate upper level divergence which pumped mass away from the depression.

Tropical Depression Eight-E will move through an environment favorable for intensification during the next several days.  The depression will move over water where the Sea Surface Temperature is near 29°C.  The upper level ridge over the Eastern North Pacific Ocean will produce northeasterly winds which will blow toward the top of the depression.  Those winds will cause some vertical wind shear, but the shear will have less effect because the depression will be over warmer water.  Tropical Depression Eight-E will strengthen during the next 48 hours and it could intensify into a hurricane.

Tropical Depression Eight-E will move around the southern side of the subtropical high pressure system over the Eastern North Pacific Ocean.  The high will steer the depression toward the west during the next few days.  On its anticipated track the depression will move in the general direction of Hawaii.

Tropical Storm Gil Forms Over Eastern North Pacific

Tropical Storm Gil formed over the Eastern North Pacific Ocean on Saturday.  A scatterometer onboard a satellite found winds to tropical storm force northeast of the center of former Tropical Depression Eight-E and the National Hurricane Center designated the system as Tropical Storm Gil.  At 5:00 p.m. EDT on Saturday the center of Tropical Storm Gil was located at latitude 15.0°N and longitude 122.4°W which put it about 980 miles (1580 km) west-southwest of the southern tip of Baja California.  Gil 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 about 50 m.p.h. (80 km/h).  The minimum surface pressure was 1006 mb.

The circulation around Tropical Storm Gil was asymmetrical.  There was a distinct low level center of circulation which was visible on satellite imagery.  However, the stronger thunderstorms were occurring east of the center of circulation.  Bands in the western half of Gil consisted primarily of showers and lower clouds.  An upper level trough south of California was producing strong westerly winds which were blowing across the top of the circulation.  The winds were causing strong vertical wind shear and they were contributing to the asymmetrical distribution of thunderstorms.  Tropical storm force winds were occurring within 80 miles (130 km) of the center of Tropical Storm Gil only in the northeastern quadrant of of the circulation.

Tropical Storm Gil will move through an environment only marginally favorable for intensification.  Gil will move over water where the Sea Surface Temperature is near 27°C.  However, the upper level trough will continue to cause significant vertical wind shear.  The strong vertical wind shear will inhibit intensification of Tropical Storm Gil.  Gil could weaken to a tropical depression if the shear increases.

Tropical Storm Gil will move south of a subtropical ridge over the Eastern North Pacific Ocean.  The ridge will steer Gil in a westward direction during the next several days.  On its anticipated track, Tropical Storm Gil will move farther away from Mexico.

Elsewhere over the Central Pacific Ocean, strong vertical wind shear was weakening Tropical Storm Erick and Tropical Storm Flossie.  At 5:00 p.m. EDT on Saturday the center of Tropical Storm Erick was located at latitude 17.3°N and longitude 163.9°W which put it about 480 miles (770 km) southwest of Honolulu, Hawaii.  Erick was moving toward the west at 13 m.p.h. (20 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 1005 mb.

At 5:00 p.m. EDT on Saturday the center of Tropical Storm Flossie was located at latitude 18.8°N and longitude 144.5°W which put it about 695 miles (1115 km) east of Hilo, Hawaii.  Flossie was moving toward the west-northwest at 13 m.p.h. (20 km/h).  The maximum sustained wind speed was 50 m.p.h. (80 km/h) and there were wind gusts to 65 m.p.h. (105 km/h).  The minimum surface pressure was 1003 mb.

Minimal Tropical Storm Gilma Forms Well East of Hawaii

Minimal Tropical Storm Gilma formed well east of Hawaii on Friday.  A scatterometer on a polar orbiting satellite indicated that there were winds to tropical storm force near former Tropical Depression Eight-E and the National Hurricane Center named the system Tropical Storm Gilma.  At 11:00 a.m. EDT on Friday the center of Tropical Storm Gilma was located at latitude 14.9°N and longitude 128.4°W which put it about 1825 miles (2935 km) east of South Point, Hawaii.  Gilma was moving toward the west-northwest 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 1006 mb.

The circulation of Tropical Storm Gilma was poorly organized.  There was a distinct low level center of circulation.  However, the stronger thunderstorms were occurring in bands east of the center.  Bands in the western half of the circulation consisted primarily of low clouds and showers.  A large upper level trough was located west of Tropical Storm Gilma.  The trough was producing strong northwesterly winds which were blowing across the top of the circulation.  Those winds were producing significant vertical wind shear and they were probably the reason why the stronger thunderstorms were occurring east of the center of circulation.

Tropical Storm Gilma will move through an environment unfavorable for intensification during the weekend.  Gilma will move over water where the Sea Surface Temperature is near 28°C.  However, the upper level trough will continue to produce significant vertical wind shear.  Gilma is likely to weaken to a depression and it could dissipate if the upper level winds blow the top of the circulation east of the low level center.

Tropical Storm Gilma will move south of a subtropical high pressure system over the Eastern North Pacific.  The strong wind shear will mean that Gilma will be steered by the winds lower in the atmosphere.  Those winds will push Gilma in a general westerly or west-northwesterly direction.