Monthly Archives: July 2025

Tropical Storm Wipha Strengthens

Tropical Storm Wipha strengthened as it moved closer to Hong Kong on Saturday.  At 11:00 a.m. EDT on Saturday the center of Tropical Storm Wipha was located at latitude 21.1°N and longitude 117.1°E which put the center about 240 miles (390 km) east-southeast of Hong Kong.  Wipha was moving toward the west-northwest at 12 m.p.h. (19 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 976 mb.

Tropical Storm Wipha strengthened on Saturday as it moved closer to Hong Kong.  The inner end of a rainband wrapped most of the way around the center of Wipha’s circulation.  More thunderstorms formed near the center of Tropical Storm Wipha.  Thunderstorms were also occurring in bands in the southern and eastern parts of Wipha’s circulation.  Bands in the northwestern quadrant of Tropical Storm Wipha consisted primarily of showers and lower clouds.  Storms near the center of Wipha generated upper level divergence that pumped mass away to the southwest of the tropical storm.  The removal of mass caused the surface pressure to decrease.

The circulation around Tropical Storm Wipha was large.  Winds to tropical storm force extended out 195 miles (315 km) from the center of Wipha’s circulation.

Tropical Storm Wipha will move through an environment favorable for intensification during the next 12 hours.  Wipha will move over water where the Sea Surface Temperatures are near 29°C. It will move under the southeastern side of an upper level ridge that is over China.  The upper level ridge will produce northeasterly winds that will blow toward the top of Wipha’s circulation.  Those winds will cause some vertical wind shear.  The vertical wind shear will inhibit intensification but the wind shear may be enough to prevent intensification.  Tropical Storm Wipha could intensify during the next 12 hours.  Wipha could strengthen to a typhoon during that time.

Tropical Storm Wipha will move around the southern part of a high pressure system over the Western North Pacific Ocean and eastern China.  The high pressure system will steer Wipha toward the west-northwest during the next 18 hours.  On its anticipated track, the center of Tropical Storm Wipha will be near Hong Kong in 18 hours.

Tropical Storm Wipha will bring strong winds and locally heavy rain to Hong Kong.  Heavy rain could cause flash floods and mudslides.  Tropical Storm Wipha will also bring strong winds and heavy rain to southern Guangdong.

Tropical Storm Wipha Passes Near Northern Luzon

The center of Tropical Storm Wipha passed just to the north of northern Luzon on Friday.  At 11:00 a.m. EDT on Friday the center of Tropical Storm Wipha was located at latitude 19.6°N and longitude 122.0°E which put the center about 80 miles (130 km) north-northeast of Aparri, Philippines.  Wipha was moving toward the northwest at 13 m.p.h. (21 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 991 mb.

The center of Tropical Storm Wipha was passing between northern Luzon and Taiwan on Friday.  More thunderstorms formed near the center of Wipha’s circulation on Friday.  Numerous bands of showers and thunderstorms were revolving around the center of Tropical Storm Wipha.  Storms near the center of Wipha generated upper level divergence that pumped mass away to the south and west of the tropical storm.  The removal of mass caused the surface pressure to decrease.

The circulation around Tropical Storm Wipha was very large.  Winds to tropical storm force extended out 205 miles (330 km) from the center of Wipha’s circulation.

Tropical Storm Wipha will move through an environment favorable for intensification during the next 24 hours.  Wipha will move over water where the Sea Surface Temperatures are near 29°C.  It will move under the southern side of an upper level ridge that is north of the Philippines.  The upper level ridge will produce easterly winds that will blow toward the top of Wipha’s circulation.  Those winds will cause some vertical wind shear, but the wind shear will not be enough to prevent intensification.  Tropical Storm Wipha will intensify during the next 24 hours.  Wipha could strengthen to a typhoon during the weekend.

Tropical Storm Wipha will move around the southwestern part of a high pressure system over the Western North Pacific Ocean.  The high pressure system will steer Wipha toward the west-northwest during the next 24 hours.  On its anticipated track, Tropical Storm Wipha could approach Hong Kong in 36 hours.

Tropical Storm Wipha will produce gusty winds and locally heavy rain in northern Luzon and southern Taiwan during the rest of today.  Heavy rain could produce flash floods in some locations.

Low Pressure System Moves Inland over Southern Louisiana

A low pressure system designated as Invest 93L moved inland over southern Louisiana on Thursday.  At 2:00 p.m. EDT on Thursday the center of a low pressure system designated as Invest 93L was located at latitude 29.9°N and longitude 89.7°W which put the center about 20 miles (30 km) east of New Orleans, Louisiana.  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 1012 mb.

The center of a low pressure system designated as Invest 93L moved inland over southern Louisiana east of New Orleans on Thursday.   The distribution of thunderstorms in the low pressure system was asymmetrical.  Thunderstorms were occurring mainly in bands in the western side of Invest 93L.  Bands in the eastern side of the low pressure system consisted primarily of showers and lower clouds.

An upper level ridge over the southern U.S. was producing east-northeasterly winds that were blowing toward the top of Invest 93L.  Those winds were causing moderate vertical wind shear.  The vertical wind shear was causing the asymmetrical distribution of thunderstorms.

The low pressure system designated as Invest 93L will move around the southern side of a high pressure system over the southern 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 inland across southern Louisiana.

Invest 93L could drop heavy rain over parts of southern Mississippi and southern Louisiana.

Flood Watches are in effect for parts of southern Mississippi and southern Louisiana.

Low Pressure System Moves Along Northern Gulf Coast

A low pressure system designated as Invest 93L moved along the northern Gulf Coast on Wednesday.  At 2:00 p.m. EDT on Wednesday the center of a low pressure system designated as Invest 93L was located at latitude 30.1°N and longitude 85.9°W which put the center about 30 miles (50 km) southeast of Destin, Florida.  Invest 93L was moving toward the west 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 1012 mb.

The center of a low pressure system designated as Invest 93L moved along the northern Gulf Coast on Wednesday.  The distribution of thunderstorms in Invest 93L continued to be asymmetrical.  Thunderstorms were occurring in bands in the southwestern quadrant of the low pressure system.  Much of the heavier rain was falling over the Gulf of Mexico.  Bands in the other parts of Invest 93L 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 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 toward southern Louisiana.

Invest 93L will move through an environment marginally 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 southern part of an upper level ridge over the southeastern U.S.  The upper level ridge will produce northeasterly winds that would 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 might not be enough to prevent Invest 93L from developing into a tropical depression, if the center remains over water.

Invest 93L could drop heavy rain over parts of southern Mississippi and southern Louisiana.

Flood Watches are in effect for parts of southern Mississippi and southern Louisiana.

Low Pressure System Moves Over Northern Florida

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

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

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

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

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

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.