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Low Pressure System Moves Over Northern Florida

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A low pressure system designated as Invest 93L moved over northern Florida on Tuesday.  At 2:00 p.m. EDT on Tuesday the center of a low pressure system designated as Invest 93L was located at latitude 29.8°N and longitude 81.2°W which put the center about 10 miles (15 km) southeast of St. Augustine, Florida.  Invest 93L was moving toward the west at 9 m.p.h. (15 km/h).  The maximum sustained wind speed was 30 m.p.h. (50 km/h) and there were wind gusts to 40 m.p.h. (65 km/h).  The minimum surface pressure was 1013 mb.

The center of a low pressure system designated as Invest 93L moved over the coast of northern Florida between St. Augustine and Daytona Beach on Tuesday afternoon.  The distribution of thunderstorms in Invest 93L was asymmetrical.  Thunderstorms were occurring in bands in the southwestern quadrant of the low pressure system.  Those thunderstorms were dropping heavy rain in some locations.  Bands in the other parts of Invest 93L consisted primarily of showers and lower clouds.

Flood Watches were in effect for parts of the Florida Peninsula.  The region under Flood Watches extended from south of Gainesville to north of Sebring, and it included Orlando, Tampa and St. Petersburg.

The low pressure system designated as Invest 93L will move around the southern side of a high pressure system over the southeastern U.S.  The high pressure system will steer Invest 93L toward the west during the next 24 hours.  On its anticipated track, Invest 93L will move across northern Florida during the next 12 hours.  The center of Invest 93L could move over the northeastern Gulf of Mexico on Wednesday.

If the center of Invest 93L moves over the northeastern Gulf of Mexico, it could move into an environment somewhat favorable for the development of a tropical cyclone on Wednesday.  Invest 93L would move over water where where the Sea Surface Temperatures are near 30°C.  It would move under the southeastern part of an upper level ridge over the southeastern U.S.  The upper level ridge would produce northeasterly winds that would blow toward the top of Invest 93L.  Those winds would cause moderate vertical wind shear.  The vertical wind shear would inhibit the development of a tropical cyclone.  However, the wind shear might not be enough to prevent Invest 93L from developing into a tropical cyclone.

A U.S. Air Force Reserve Hurricane Hunter reconnaissance plane is tentatively tasked with investigating the low pressure system on Wednesday afternoon, if necessary.

Tropical Storm Nari Moves Across Hokkaido

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Tropical Storm Nari moved across Hokkaido on Monday.  At 5:00 p.m. EDT on Monday the center of Tropical Storm Nari was located at latitude 43.6°N and longitude 144.6°E which put the center about 45 miles (75 km) east-southeast of Kitami, Japan.  Nari was moving toward the north-northeast at 33 m.p.h. (54 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 993 mb.

Tropical Storm Nari was making a transition to an extratropical cyclone as it moved across Hokkaido on Monday.  Most of the bands revolving around the center of Nari’s circulation consisted primarily of showers and lower clouds.  There were still a few thunderstorms in bands in the southeastern part of Tropical Storm Nari.

The strongest winds were occurring in the eastern side of Tropical Storm Nari.  Winds to tropical storm force extended out 140 miles (225 km) in the eastern side of Nari’s circulation.  The winds in the western part of Tropical Storm Nari were blowing at less than tropical storm force.

Tropical Storm Nari will move into the upper level westerly winds in the middle latitudes.  Those winds will steer Nari toward the east-northeast during the next 24 hours.  On its anticipated track, Tropical Storm Nari will move quickly away from Hokkaido in a few hours.

Tropical Storm Nari will move through an environment very unfavorable for a tropical cyclone during the next 24 hours.  Nari will move over water where where the Sea Surface Temperatures are near 12°C.  It will move under the eastern side of an upper level low west of Japan.  The upper level low will produce strong southwesterly winds that will blow toward the top of Nari’s circulation.  Those winds will cause strong vertical wind shear.  The cold water and strong vertical wind shear will cause Tropical Storm Nari to continue its transition to an extratropical cyclone.

Tropical Storm Nari will continue to produce strong winds and isolated heavy rain in Hokkaido during the next few hours.  Weather conditions in Hokkaido will improve on Tuesday when Nari moves rapidly away from the area.

Low Pressure System Develops East of Florida

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A low pressure system developed over the Atlantic Ocean east of Florida on Monday.  The low pressure system has been designated as Invest 93L.  At 2:00 p.m. EDT on Monday the center of a low pressure system designated as Invest 93L was located at latitude 29.6°N and longitude 78.0°W which put the center about 200 miles (325 km) east-northeast of Daytona Beach, Florida.  Invest 93L was moving toward the west-southwest at 4 m.p.h. (6 km/h).  The maximum sustained wind speed was 25 m.p.h. (40 km/h) and there were wind gusts to 35 m.p.h. (55 km/h).  The minimum surface pressure was 1016 mb.

A low pressure system developed over the Atlantic Ocean east of Florida on Monday.  Visible satellite images showed evidence of a center of circulation and of bands of showers and thunderstorms.  The distribution of thunderstorms around the low pressure system was asymmetrical.  Thunderstorms were occurring in bands in the southern part of the low pressure system.  Bands in the northern part of the system consisted primarily of showers and lower clouds.

The low pressure system designated as Invest 93L will move around the southern side of a high pressure system over the eastern U.S.  The high pressure system will steer Invest 93L toward the west during the next 24 hours.  On its anticipated track, Invest 93L will move toward the coast of northeastern Florida.

The low pressure system will move through an environment somewhat favorable for the development of a tropical cyclone during the next 24 hours.  Invest 93L will move over water where where the Sea Surface Temperatures are near 30°C.  It will move under the southeastern part of an upper level ridge over the southeastern U.S.  The upper level ridge will produce northeasterly winds that will blow toward the top of Invest 93L.  Those winds will cause moderate vertical wind shear.  The vertical wind shear will inhibit the development of a tropical cyclone.  However, the wind shear may not be enough to prevent Invest 93L from developing into a tropical cyclone.

A U.S. Air Force Reserve Hurricane Hunter reconnaissance plane is tentatively tasked with investigating the low pressure system on Tuesday afternoon, if necessary.

Even if Invest 93L does not develop into a Tropical Cyclone before it reaches Florida, the low pressure system will drop heavy rain over parts of central and south Florida.  Prolonged periods of heavy rain could cause floods in some locations.

Tropical Storm Nari Strengthens Southeast of Tokyo

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Tropical Storm Nari strengthened over the Western North Pacific Ocean southeast of Tokyo on Sunday.  At 5:00 p.m. EDT on Sunday the center of Tropical Storm Nari was located at latitude 33.2°N and longitude 143.0°E which put the center about 300 miles (485 km) southeast of Tokyo, Japan.  Nari was moving toward the north at 17 m.p.h. (28 km/h).  The maximum sustained wind speed was 60 m.p.h. (95 km/h) and there were wind gusts to 75 m.p.h. (120 km/h).  The minimum surface pressure was 984 mb.

Tropical Storm Nari strengthened on Sunday as it moved over the Western North Pacific Ocean southeast of Tokyo.  The structure Nari’s circulation changed when it moved under an upper level low south of Japan.  The inner end of a rainband wrapped around the western and southern sides of the center Tropical Storm Nari.  A region of drier air wrapped around the outside of that rainband.  Thunderstorms were occurring near the center of Naria’s circulation.  Thunderstorms were also occurring in bands in the northeastern part of Tropical Storm Nari.

The distribution of winds speeds in Tropical Storm Nari continued to be asymmetrical.  Winds to tropical storm force extended out 180 miles (290 km) in the eastern side of Nari’s circulation. Winds to tropical storm force extended out 65 miles (105 km) in the western side of Tropical Storm Nari.

Tropical Storm Nari will move through an environment that will be marginally favorable for intensification during the next 12 hours.  Nari will move over water where where the Sea Surface Temperatures are near 28°C.  It will move under the northeastern part of an upper level low south of Japan.  The upper level low will produce southerly winds that will blow toward the top of Nari’s circulation. Those winds will cause moderate vertical wind shear.  The vertical wind shear will inhibit intensification.  Tropical Storm Nari could intensify a little during the next 12 hours.  Nari will move over colder water later on Monday.  The colder water will cause Tropical Storm Nari to start to weaken.  The colder water will also cause Nari to start a transition to an extratropical storm.

Tropical Storm Nari will move around the western side of a high pressure system over the Western North Pacific Ocean.  The high pressure system will steer Nari toward the north during the next 24 hours.  On its anticipated track, Tropical Storm Nari will pass east of Honshu.  Nari will be south of Hokkaido in 24 hours.

 

Tropical Storm Nari Develops South of Japan

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Tropical Storm Nari developed over the Western North Pacific Ocean south of Japan on Saturday.  At 5:00 p.m. EDT on Saturday the center of Tropical Storm Nari was located at latitude 25.8°N and longitude 142.4°E which put the center about 715 miles (1150 km) south-southeast of Tokyo, Japan.  Nari was moving toward the east-northeast 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 998 mb.

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

More thunderstorms formed near the center of Tropical Storm Nari on Saturday.  More thunderstorms also developed in bands in the eastern side of Nari’s circulation.  Bands in the western side of Tropical Storm Nari consisted primarily of showers and lower clouds.  Storms near the center of Nari generated upper level divergence that pumped mass away to the south of the tropical storm. The removal of mass caused the surface pressure to decrease.

The distribution of winds speeds in Tropical Storm Nari was asymmetrical.  Winds to tropical storm force extended out 110 miles (185 km) in the eastern side of Nari’s circulation.  The winds in the western side of Tropical Storm Nari were blowing at less than tropical storm force.

Tropical Storm Nari will move through an environment that will be mostly favorable for intensification during the next 24 hours.  Nari will move over water where where the Sea Surface Temperatures are near 29°C.  It will move under the southeastern part of an upper level low south of Japan.  The upper level low will produce westerly winds that will blow toward the top of Nari’s circulation,  Those winds will cause moderate vertical wind shear.  The vertical wind shear will inhibit intensification, but the shear will not be enough to prevent intensification.  Tropical Storm Nari will intensify during the next 24 hours.

Tropical Storm Nari will move around the western side of a high pressure system over the Western North Pacific Ocean.  The high pressure system will steer Nari toward the north during the next 24 hours.  On its anticipated track, Tropical Storm Nari will move toward eastern Japan.  Nari could approach eastern Honshu in 36 hours.

Tropical Storm Danas Drops Rain on Eastern China

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Tropical Storm Danas dropped rain on eastern China on Tuesday.  At 5:00 p.m. EDT on Tuesday the center of Tropical Storm Danas was located at latitude 27.6°N and longitude 120.3°E which put the center about 50 miles (80 km) southwest of Wenzhou, China.  Danas was moving toward the west-southwest at 6 m.p.h. (10 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 986 mb.

The center of Tropical Storm Danas made landfall on the east coast of China just to the south of Wenzhou on Tuesday.  The maximum sustained wind speed was 40 m.p.h. (65 km/h) at the time of landfall.  Winds to tropical storm force extended out 120 miles (195 km) from the center of Danas’ circulation.

Tropical Storm Danas will move around the southern side of a high pressure system over eastern Asia.  The high pressure system will steer Danas toward the southwest during the next 24 hours.  On its anticipated track, Tropical Storm Danas will move farther inland over eastern China.

Tropical Storm Danas will weaken gradually as it moves inland over eastern China.  The heaviest rain will be produced by bands in the southern side of Danas’ circulation.  Bands in the northern side of Tropical Storm Danas will consist primarily of showers and lower clouds.

Tropical Storm Danas will drop heavy rain over parts of Zhejiang.  Heavy rain could cause floods in some locations.

The strongest winds will occur in the eastern side of Danas’ circulation which will be over the East China Sea.  Most of the winds over land will be at less than tropical storm force.

Tropical Storm Danas Nears Eastern China

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Tropical Storm Danas was nearing eastern China on Monday evening.  At 11:00 p.m. EDT on Monday the center of Tropical Storm Danas was located at latitude 28.1°N and longitude 122.0°E which put the center about 80 miles (130 km) east of Wenzhou, China and about 50 miles (80 km) southeast of Taizhou, China.  Danas was moving toward the north at 6 m.p.h. (10 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.

Even though Tropical Storm Danas was over the East China Sea on Monday, Danas’ circulation was still disrupted from the affects of its passage over Taiwan on Sunday.  The distribution of thunderstorms in Tropical Storm Danas was asymmetrical.  Thunderstorms were occurring in bands in the southern part of Danas’ circulation.  Bands in the northern side of Tropical Storm Danas consisted primarily of showers and lower clouds.

Winds to tropical storm force extended out 90 miles (145 km) from the center of Tropical Storm Danas.

Tropical Storm Danas will move through an environment that will be somewhat favorable for intensification during the next few hours. Danas will move over water where where the Sea Surface Temperatures are near 29°C.  It will move under the middle of an upper level ridge over East China Sea.  The upper level winds are weak near the middle of the ridge and there will be little vertical wind shear.  Even though Tropical Storm Danas will move through a somewhat favorable environment, Danas may not intensify because of the disruption of its circulation during the passage over Taiwan.

Tropical Storm Danas will move around the southern side of a high pressure system over eastern Asia.  The high pressure system will steer Danas toward the west during the next 24 hours.  On its anticipated track, Tropical Storm Danas will move over eastern China in a few hours.

The center of Tropical Storm Danas is likely to make landfall in China between Taizhou and Wenzhou.  Danas will bring gusty winds and locally heavy rain to Zhejiang.  Heavy rain could cause floods in some locations.

Typhoon Danas Brings Wind and Rain to Taiwan

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Typhoon Danas brought strong winds and heavy rain to Taiwan on Sunday.  Danas weakened to a tropical storm after it moved across Taiwan.  At 11:00 p.m. EDT on Sunday the center of Tropical Storm Danas was located at latitude 25.9°N and longitude 121.6°E which put the center about 30 miles (50 km) north-northwest of Taipei, Taiwan.  Danas was moving toward the north-northeast at 22 m.p.h. (35 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 989 mb.

The center of former Typhoon Danas moved north-northeast across western Taiwan on Sunday.  Danas produced strong winds and heavy rains as it moved across Taiwan.  The heaviest rain fell in parts of southern Taiwan and in a few mountain areas where the winds were blowing up the slopes.  The Central Weather Administration’s radar estimated that up to a foot (300 mm) of rain fell in some locations.

Former Typhoon Danas weakened to a tropical storm as it moved across western Taiwan.  The center of Danas’ circulation moved over the East China Sea on Sunday night.  Thunderstorms were still occurring near the center of Tropical Storm Danas.  Thunderstorms were also still occurring in bands revolving around the center of Danas’ circulation.

The distribution of wind speeds in Tropical Storm Danas was asymmetrical.  Winds to tropical storm force extended out 175 miles (280 km) in the eastern side of Danas’ circulation.  Winds to tropical storm force extended out 80 miles (130 km) in the western side of Danas.

Tropical Storm Danas will move through an environment that will be somewhat favorable for intensification during the next 24 hours.  Danas will move over water where where the Sea Surface Temperatures are near 29°C.  It will move under the eastern side of an upper level low over eastern China.  The upper level low will produce southwesterly winds that will blow toward the top of Danas’ circulation.  Those winds will cause moderate vertical wind shear.  The wind shear will inhibit intensification, but the shear may not be enough to prevent intensification.  Tropical Storm Danas could intensify during the next 24 hours.

The upper level low over eastern China will steer Tropical Storm Danas toward the north-northeast during the next 24 hours.  On its anticipated track, Danas will move away from Taiwan.  Tropical Storm Danas could approach the east coast of China in 36 hours.

Wind speeds will decrease in Taiwan when Tropical Storm Danas moves farther away.  Heavy rain should also diminish as the circulation around Danas moves away from Taiwan.

Elsewhere over the Western North Pacific Ocean, Tropical Storm Mun weakened east of Japan.  At 11:00 p.m. EDT on Sunday the center of Tropical Storm Mun was located at latitude 35.5°N and longitude 148.7°E which put the center about 520 miles (835 km) east of Tokyo, Japan.  Mun was moving toward the north-northwest at 12 m.p.h. (19 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 986 mb.

Chantal Drops Flooding Rains on North Carolina

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Former Tropical Storm Chantal dropped flooding rains on parts of North Carolina on Sunday.   At 11:00 p.m. EDT on Sunday the center of Tropical Depression Chantal was located at latitude 35.9°N and longitude 78.7°W which put the center about 60 miles (95 km) southeast of Danville, Virginia.  Chantal was moving toward the northeast at 12 m.p.h. (19 km/h).  The maximum sustained wind speed was 30 m.p.h. (50 km/h) and there were wind gusts to 40 m.p.h. (65 km/h).  The minimum surface pressure was 1006 mb.

Flash Flood Warnings were in effect for Moore, Alamance, Chatham, Durham, Orange, Randolph, and Person Counties in North Carolina.

Former Tropical Storm Chantal moved northward across central North Carolina on Sunday.  Bands in the northern side of Tropical Depression Chantal dropped heavy rain over central North Carolina and south-central Virginia.

A weather station in Lumberton, North Carolina measured 4.68 inches (119 mm) of rain.

A weather station in Burlington, North Carolina measured 4.08 inches (104 mm) of rain.

A weather station in Fayetteville, North Carolina measured 2.07 inches (53 mm) of rain.

Tropical Depression Chantal will move northeast across eastern Virginia on Monday.

Flood Watches are in effect for central North Carolina and south-central Virginia.

Typhoon Danas Hits Taiwan

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Typhoon Danas hit Taiwan on Sunday.  At 11:00 a.m. EDT on Sunday the center of Typhoon Danas was located at latitude 23.5°N and longitude 120.0°E which put the center about 75 miles (120 km) southwest of Taichung, Taiwan.  Danas was moving toward the northeast at 13 m.p.h. (21 km/h).  The maximum sustained wind speed was 105 m.p.h. (165 km/h) and there were wind gusts to 125 m.p.h. (200 km/h).  The minimum surface pressure was 958 mb.

Typhoon Danas rapidly intensified to the equivalent of a Category 2 hurricane on the Saffir-Simpson Scale as it approached Taiwan on Sunday.  The inner end of a rainband wrapped around the center of Danas’ circulation.  A circular eye with a diameter of 16 miles (26 km) formed at the center of Typhoon Danas.  Other bands of showers and thunderstorms were revolving around the core of Danas’ circulation.

The size of the circulation around Typhoon Danas increased when Danas rapidly intensified.  Winds to typhoon force extended out 35 miles (55 km) from the center of Danas’ circulation.  Winds to tropical storm force extended out 160 miles (260 km) in the eastern side of Typhoon Danas.  Winds to tropical storm force extended out 85 miles (135 km) in the western side of Danas.

The Hurricane Intensity Index (HII) for Typhoon Danas is 17.8.  The Hurricane Size Index (HSI) is 14.4 and the Hurricane Wind Intensity Size Index (HWISI) is 32.2.  Typhoon Danas is similar in size and intensity to Hurricane Sally when Sally hit Alabama in 2020.

Typhoon Danas will bring strong, gusty winds and heavy rain to Taiwan.  Heavy rain is likely to cause flash floods and mudslides.  Widespread outages of electricity are possible.  Typhoon Danas could also cause a storm surge of up to 10 feet (3 meters) along parts of the coast of Taiwan.

Elsewhere over the Western North Pacific Ocean, Tropical Storm Mun continued to churn east of Japan.  At 11:00 a.m. EDT on Sunday the center of Tropical Storm Mun was located at latitude 33.9°N and longitude 149.4°E which put the center about 545 miles (875 km) east of Tokyo, Japan.  Mun was moving toward the north at 9 m.p.h. (15 km/h).  The maximum sustained wind speed was 60 m.p.h. (95 km/h) and there were wind gusts to 75 m.p.h. (120 km/h).  The minimum surface pressure was 982 mb.