TD 7 Strengthens Into Tropical Storm Gonzalo

Former Tropical Depression Seven strengthened into Tropical Storm Gonzalo on Wednesday morning.  At 11:00 a.m.  EDT on Wednesday the center of Tropical Storm Gonzalo was located at latitude 9.9°N and longitude 43.6°W which put it about 1205 miles (1935 km) east of the southern Windward Islands.  Gonzalo was moving toward the west at 14 m.p.h. (22 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 1000 mb.

The circulation around former Tropical Depression Seven exhibited much better organization on Wednesday morning and the National Hurricane Center designated the system as Tropical Storm Gonzalo.  A band of thunderstorms curved around the southern and eastern sides of the center of circulation.  The inner end of the band appeared to be wrapping farther around the center and visible satellite images suggested that an eye could be forming.  Bands of showers and thunderstorms were revolving around the center of Gonzalo.  Storms near the center were generating upper level divergence which was pumping mass away from the tropical storm.  The circulation around Tropical Storm Gonzalo was small.  Winds to tropical storm force only extended out 25 miles (40 km) from the center of circulation.

Tropical Storm Gonzalo will move through an environment favorable for intensification.  Gonzalo will move over water where the Sea Surface Temperature is near 29.5°C.  It will move through a region where the upper level winds are weak and there will be little vertical  wind shear.  Tropical Storm Gonzalo is likely to intensify and it could strengthen into a hurricane during the next 36 hours.  Small tropical cyclones like Gonzalo can change intensity rapidly if they move into a different type of environment.

Tropical Storm Gonzalo will move south of the subtropical high pressure system over the North Atlantic Ocean.  The high will steer Gonzalo toward the west.  On its anticipated track Tropical Storm Gonzalo could approach the Windward Islands on Saturday.  Watches could be issued for some of those islands when Gonzalo moves closer.

Elsewhere, more thunderstorms were developing around a low pressure system over the Gulf of Mexico that is currently designated as Invest 91L.  At 8:00 a.m. EDT on Wednesday the center of Invest 91L was located at latitude 25.7°N and longitude 87.9°W which put it about 645 miles (1040 km) east-southeast of Corpus Christi, Texas.  The low pressure system was moving toward the west-northwest 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 1011 mb.  The National Hurricane Center was indicating the probability was 50% that the low pressure system would develop into a tropical cyclone.