Tag Archives: Potential Tropical Cyclone Six

Low Pressure System over Gulf of Mexico Designated Potential Tropical Cyclone Six

A low pressure system over the southwestern Gulf of Mexico was designated as Potential Tropical Cyclone Six by the U.S. National Hurricane Center on Sunday afternoon.  A Tropical Storm Watch was issued for the coast of northern Mexico.  At 5:00 p.m. EDT on Sunday the center of Potential Tropical Cyclone Six located at latitude 21.6°N and longitude 94.6°W which put the center about 340 miles (545 km) south-southeast of the Mouth of the Rio Grande River.  The low pressure system was moving toward the northwest at 5 m.p.h. (8 km/h).  The maximum sustained wind speed was 50 m.p.h. (80 km/h) and there were wind gusts to 60 m.p.h. (95 km/h).  The minimum surface pressure was 1003 mb.

A Tropical Storm Watch was in effect for the portion of the coast from Barra del Tordo,, Mexico to the Mouth of the Rio Grande River.

A U.S. Air Force Reserve Hurricane Hunter reconnaissance aircraft investigated a low pressure system over the southwest Gulf of Mexico that was previously designated as Invest 91L on Sunday afternoon.  The Hurricane Hunters found that there was a large low pressure system with a broad counterclockwise rotation.  The reconnaissance flight was unable to find a distinct low level center of circulation.  The flight crew did find a large area of tropical storm force winds in the western side of the low pressure system.

Winds to tropical storm force extended out 185 miles (295 km) in the western side of Potential Tropical Cyclone Six.  The winds in the eastern side of the low pressure system were blowing at less than tropical storm force.

The strongest winds in Potential Tropical Cyclone Six were occurring in bands of thunderstorms in the southwestern part of the low pressure system.  The bands in the other parts of the circulation consisted primarily of showers and lower clouds.  The storms in the southwestern part of Potential Tropical Cyclone Six began to generate upper level divergence that pumped mass away from the low pressure system.

Potential Tropical Cyclone Six will move through an environment mostly favorable for the intensification during the next 24 hours.  The low pressure system will move over water where the Sea Surface Temperatures are near 30°C.  It will move over the eastern part of an upper level ridge over northern Mexico and the western Gulf of Mexico.  The upper level ridge will produce northwesterly winds that will blow toward the top of Potential Tropical Cyclone Six’s circulation.  Those winds will cause some vertical wind shear.  The wind shear will inhibit intensification, but the shear will not be enough to prevent intensification.  The large size of the circulation around the low pressure system will also reduce the rate of intensification.  Potential Tropical Cyclone Six is likely to intensify slowly during the next 24 hours.  The low pressure system could intensify more rapidly after an inner core forms.

Potential Tropical Cyclone Six will move around the southwestern part of a high pressure system that extends from the western Atlantic Ocean to the Gulf of Mexico.  The high pressure system will steer the low pressure system toward the northwest during the next 24 hours.  On its anticipated track, Potential Tropical Cyclone Six will move toward northern Mexico.  The low pressure system will move more toward the north on Tuesday when it moves around the western end of the high pressure system.  It is likely to be southeast of Texas on Tuesday night.  Potential Tropical Cyclone Six could approach the coast of Louisiana on Wednesday.  It could be a hurricane when it approaches the coast of Louisiana.

Potential Tropical Cyclone Six Prompts Watches for Puerto Rico, U.S. Virgin Islands, Dominican Republic

Potential Tropical Cyclone Six prompted the issuance of Tropical Storm Watches for Puerto Rico, the U.S. Virgin Islands, the Dominican Republic and some of the Lesser Antilles on Monday afternoon. At 5:00 p.m. EDT on Monday the center of Potential Tropical Cyclone Six was located at latitude 14.2°N and longitude 59.2°W which put it about 165 miles (270 km) east-southeast of Dominica. The potential tropical cyclone was moving toward the west-northwest at 15 m.p.h. (24 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 1010 mb.

Tropical Storm Watches were issued for the U.S. Virgin Islands and Puerto Rico including Culebra and Vieques. A Tropical Storm Watch was issued for the coast of the Dominican Republic from Punta Palenque to the northern border with Haiti. Tropical Storm Watches were also issued for Dominica, Guadeloupe and Martinique.

The National Hurricane Center designated a low pressure system east of the Lesser Antilles (formerly designated at Invest 94L) as Potential Tropical Storm Six on Monday afternoon in order to issue the Tropical Storm Watches. The circulation around Potential Tropical Cyclone Six exhibited more organization on Monday. More thunderstorms formed in bands revolving around the center of the low pressure system. Storms near the center of circulation began to generate upper level divergence that pumped mass away from the low pressure system. The removal of mass should allow the surface pressure to decrease.

Potential Tropical Cyclone Six will move through an environment favorable for intensification during the next 24 hours. It will move over water where the Sea Surface Temperatures are near 28°C. The low pressure system will move under a small upper level ridge near the Lesser Antilles. The upper level winds are weak in the ridge and there will be little vertical wind shear. Potential Tropical Cyclone Six could develop into a tropical storm by the time it reaches the Lesser Antilles.

Potential Tropical Cyclone Six will move south of a subtropical high pressure system over the Atlantic Ocean. The high will steer the low pressure system toward the west-northwest during the next several days. On its anticipated track Potential Tropical Cyclone Six will move over the central Lesser Antilles on Monday night. It will bring gusty winds and locally heavy rain. Heavy rain could cause flash floods in some locations. Potential Tropical Cyclone Six could approach Puerto Rico later on Tuesday.

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.