Tag Archives: Cabo Verde

Tropical Storm Kirk Forms South of the Cabo Verde Islands

Tropical Storm Kirk formed south of the Cabo Verde Islands on Saturday.  At 11:00 a.m. EDT on Saturday the center of Tropical Storm Kirk was located at latitude 8.3°N and longitude 23.6°W which put it about 450 miles (730 km) south of the Cabo Verde Islands.  Kirk was moving toward the west at 14 m.p.h. (22 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.

The circulation around Tropical Storm Kirk is large and not well organized.  There is a low level center of circulation, but there are not many thunderstorms near the center.  There were thunderstorms in a cluster west of the center and more thunderstorms were in another cluster east of the center.  Some of the thunderstorms appeared to be organizing into bands, but the bands were not well developed.

Tropical Storm Kirk will move through an environment during the next day or two that should be favorable for intensification.  Kirk will move over water where the Sea Surface Temperature is near 27°C.  It will move through an area where the upper level winds are weak and the wind shear will not be strong enough to prevent intensification.  Tropical Storm Kirk is likely to become more organized during the next 24 to 48 hours.  It will move into a region in a couple of days where the lower level easterly winds will be stronger vertical wind shear could increase.

Tropical Storm Kirk will move south of a subtropical high pressure system over the Atlantic Ocean.  The high will steer Kirk toward the west at a fairly quick pace.  On its anticipated track Tropical Storm Kirk could approach the Lesser Antilles by late next week.

Elsewhere over the tropical Atlantic, Tropical Depression Eleven moved slowly toward the Windward Islands.  At 11:00 a.m. EDT on Saturday the center of Tropical Depression Eleven was located at latitude 13.2°N and longitude 53.8°W which put it about 485 miles (780 km) east of the Windward Islands.  It was moving toward the west at 3 m.p.h. (5 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 1008 mb.

Florence Strengthens Back Into a Hurricane

Florence strengthened back into a hurricane on Sunday morning.  At 11:00 a.m. EDT on Sunday the center of Hurricane Florence was located at latitude 24.4°N and longitude 56.3°W which put it about 750 miles (1210 km) southeast of Bermuda.  Florence was moving toward the west at 6 m.p.h. (10 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 984 mb.

Hurricane Florence was better organized on Sunday morning.  A NOAA research aircraft reported a circular eye with a diameter of 24 miles (39 km).  The eye was surrounded by a ring of strong thunderstorms and the strongest winds were occurring in that ring of storms.  Several bands of showers and thunderstorms were revolving around the core of Hurricane Florence.  Storms near the core were generating upper level divergence which was pumping mass away from the hurricane.  Winds to hurricane force extended out about 20 miles (35 km) to the east of the center of circulation.  Winds to tropical storm force extended out about 115 miles (185 km) to the north of the center and about 50 miles (80 km) to the south of the center.

Hurricane Florence will be moving through an environment favorable for intensification.  Florence 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 Florence will strengthen and it could intensify rapidly at times.  Florence is likely to be a major hurricane on Monday.

Hurricane Florence will move around the western end of a subtropical high pressure system over the western Atlantic Ocean.  The high will steer Florence in a general west-northwesterly direction.  On its anticipated track the center of Hurricane Florence will approach the southeast coast of the U.S. on Thursday.  It is likely to be a major hurricane at that time.

Elsewhere, Tropical Storm Helene and Tropical Storm Isaac moved westward over the tropical Atlantic Ocean.  At 11:00 a.m. EDT on Sunday the center of Tropical Storm Helene was located at latitude 13.2°N and longitude 25.0°W which put it about 120 miles (195 km) south-southwest of the Cabo Verde Islands.  Helene was moving toward the west at 13 m.p.h. (20 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 997 mb.  Tropical Storm Warnings were in effect for Santiago, Fogo and Brava.

At 11:00 a.m. EDT on Sunday the center of Tropical Storm Isaac was located at latitude 14.3°N and longitude 39.1°W which put it about 1470 miles (2370 km) east of the Windward Islands.  Isaac was moving toward the west at 9 m.p.h. (15 km/h).  The maximum sustained wind speed was 65 m.p.h. (105km/h) and there were wind gusts to 80 m.p.h. (130 km/h).  The minimum surface pressure was 999 mb.

Tropical Storm Florence Develops West of Cabo Verde Islands

Tropical Storm Florence developed west of the Cabo Verde Islands on Saturday.  At 5:00 p.m. EDT on Saturday the center of Tropical Storm Florence was located at latitude 15.6°N and longitude 29.0°W which put it about 310 miles (500 km) west of the Cabo Verde Islands.  Florence was moving toward the west-northwest at 16 m.p.h. (26 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 1002 mb.

The circulation of former Tropical Depression Six became better organized on Saturday and the National Hurricane Center designated the system as Tropical Storm Florence.  The center of circulation became more well defined and more thunderstorms developed closer to the center.  Numerous bands of showers and thunderstorms began to form.  The forming rainbands were revolving around the center of circulation.  Storms near the center started to generate upper level divergence.

Tropical Storm Florence will be moving through an environment somewhat favorable for intensification during the next day or two.  Florence will move over water where the Sea Surface Temperature is near 26°C.  It will move through a region where the upper level winds will be weak and there will be little vertical wind shear.  Tropical Storm Florence is likely to intensify during the next 24 to 48 hours.

Tropical Storm Florence will be moving south of a subtropical ridge over the eastern Atlantic Ocean.  The ridge will steer Florence in a general west-northwesterly motion during the next two or three days.  On its anticipated track the center of Tropical Storm Florence will move farther away from the Cabo Verde Islands.

Potential Tropical Cyclone Six Causes Warning for Cabo Verde Islands

The potential strengthening of Potential Tropical Cyclone Six caused the government of the Cabo Verde Islands to issue Tropical Storm Warnings for some of the southern islands on Thursday.  Tropical Storm Warnings were issued to Santiago, Fogo and Brava.  At 5:00 p.m. EDT on Thursday the center of Potential Tropical Cyclone Six was located at latitude 12.9°N and longitude 19.4°W which put it about 360 miles (580 km) east-southeast of the Cabo Verde Islands.  It 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 1007 mb.

The circulation of of Potential Tropical Cyclone Six was still organizing.  There was a broad area of low pressure, but there was not a well defined center of circulation.  Numerous bands of showers and thunderstorms were revolving around the circulation of the broad low.  Many of the stronger thunderstorms were in the outer part of the circulation.  Since there were few thunderstorm in the inner portion of the circulation, it had not started to generate upper level divergence.

Potential Tropical Cyclone Six will be moving through an area favorable for intensification.  It will move over water where the Sea Surface Temperature is near 28°C.  It will move through a region where there will be little vertical wind shear.  Potential Tropical Cyclone Six is forecast to become a tropical depression during the next 12 hours.  It could strengthen into a tropical storm on Friday and it could intensify into a hurricane during the weekend.

Potential Tropical Cyclone Six will move south of a subtropical ridge over the eastern Atlantic Ocean during the next few days.  The ridge will steer the system toward the west-northwest.  On its anticipated track Potential Tropical Cyclone Six will pass near the southern Cabo Verde Islands on Friday, which is why the Tropical Storm Warning was issued.