Tag Archives: Subtropical Storm Patty

Tropical Storm Warning Issued for Jamaica, Hurricane Watch for Cayman Islands

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The threat posed by a low pressure system over the Southwestern Caribbean Sea prompted the issuance of a Tropical Storm Warning for Jamaica and a Hurricane Watch for the Cayman Islands on Sunday afternoon.  The low pressure system was designated as Potential Tropical Cyclone Eighteen by the U.S. National Hurricane Center.  At 4:00 p.m. EST on Sunday the center of Potential Tropical Cyclone Eighteen was located at latitude 13.0°N and longitude 77.1°W which put the center about 345 miles (555 km) south of Kingston, Jamaica.  The low pressure system was moving toward the northeast at 7 m.p.h. (11 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 1004 mb.

A Hurricane Watch is in effect for Grand Cayman, Little Cayman, and Cayman Brac.

A Tropical Storm Warning is in effect for Jamaica.

A U.S. Air Force Reserve Hurricane Hunter aircraft investigated a low pressure system over the Southwestern Caribbean Sea on Sunday afternoon.  The aircraft found that there was a distinct low low level center of circulation in the low pressure system.  More thunderstorms were forming near the center of the low pressure system.  Bands of showers and thunderstorms were starting to revolve around the center of Potential Tropical Cyclone Eighteen.  Storms near the center of the low pressure system began to generate upper level divergence.

Potential Tropical Cyclone Eighteen will move through an environment favorable for intensification during the next 24 hours.  The low pressure system will move over water where the Sea Surface Temperatures are near 29°C.  It will move under the western end of an upper level ridge over the Caribbean Sea.  The upper level ridge will produce southeasterly winds that will blow toward the top of the low pressure system.  Those winds will cause some vertical wind shear, but the wind shear will not be enough to prevent intensification.  Potential Tropical Cyclone Eighteen will intensify during the next 24 hours.  It is likely to become a tropical storm on Monday.

Potential Tropical Cyclone Eighteen will move around the southwestern part of a high pressure system over the western Atlantic Ocean.  The high pressure system will steer Potential Tropical Cyclone Eighteen toward the north-northwest during the next 24 hours.  On its anticipated track, Potential Tropical Cyclone Eighteen will reach Jamaica on Monday night.  It could reach the Cayman Islands on Tuesday afternoon.

Potential Tropical Cyclone Eighteen will bring strong winds and heavy rain Jamaica and the Cayman Islands.  Heavy rain is likely to cause floods in some locations.

Elsewhere, Subtropical Storm Patty moved east of the Azores.  At 4:00 p.m. EST on Sunday the center of Subtropical Storm Patty was located at latitude 37.3°N and longitude 22.3°W which put the center about 280 miles (450 km) east-southeast of Lajes, Azores.  Patty was moving toward the east at 17 m.p.h. (28 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 990 mb.

Subtropical Storm Patty Moves Across the Azores

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Subtropical Storm Patty was moving across the Azores on Saturday night.  At 11:00 p.m. EDT on Saturday the center of Subtropical Storm Patty was located at latitude 37.9°N and longitude 27.8°W which put the center about 75 miles (120 km) south-southwest of Lajes, Azores.  Patty was moving toward the east at 20 m.p.h. (32 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 985 mb.

A Tropical Storm Warning is in effect for the Azores.

Subtropical Storm Patty strengthened a little as it approached the Azores on Saturday.  However, Patty appeared to be starting to weaken on Saturday night.  The distribution of thunderstorms started to look a little more asymmetrical.  The strongest thunderstorms were occurring in bands in the northeastern part of Patty’s circulation.  Bands in the southern and western parts of Subtropical Storm Patty consisted primarily of showers and lower clouds.

The circulation around Subtropical Storm Patty remained large.  Winds to tropical storm force extended out 205 miles (325 km) in the southern side of Patty’s circulation.  Winds to tropical storm force extended out 105 miles (165 km) in the northern side of Subtropical Storm Patty.

Subtropical Storm Patty will move through an environment unfavorable for intensification during the next 24 hours.  Patty will move over water where the Sea Surface Temperatures are near 21°C.  It will move under the southern part of an upper level low.  The upper level low will produce southwesterly winds that will blow toward the top of Patty’s circulation.  Those winds will cause moderate vertical wind shear and the wind shear will inhibit intensification.  Subtropical Storm Patty is likely to weaken during the next 24 hours.

The upper level trough will steer Subtropical Storm Patty toward the east during the next 24 hours.  On its anticipated track, Subtropical Storm Patty will continue to move across the Azores during the next 12 hours,  Patty will move east of the Azores later on Sunday.

Subtropical Storm Patty will bring strong winds and heavy rain to the Azores during Saturday night and Sunday.  Strong winds could cause localized damage and electricity outages.

 

Subtropical Storm Patty Forms, Tropical Storm Warning Issued for Azores

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Subtropical Storm Patty formed over the North Atlantic Ocean on Saturday morning and a Tropical Storm Warning was issued for the Azores. At 5:00 a.m. EDT on Saturday the center of Subtropical Storm Patty was located at latitude 39.9°N and longitude 34.4°W which put the center about 426 miles (675 km) west-northwest of the Azores.  Patty was moving toward the east-southeast at 7 m.p.h. (11 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 998 mb.

A Tropical Storm Warning is in effect for the Azores.

A low pressure system at the center of an old occluded extratratropical cyclone over the North Atlantic Ocean was designated as Subtropical Storm Patty by the U.S. National Hurricane Center on Saturday morning.  The circulation around Subtropical Storm Patty was symmetrical.  A clear area like an eye was at the center of Patty’s circulation.  The clear area was surrounded by a ring of showers and low topped thunderstorms.  Bands of showers and thunderstorms were revolving around the center of Subtropical Storm Patty.

The circulation around Subtropical Storm Patty was large, since Patty formed at the center of an old occluded extratropical cyclone.  Winds to tropical storm force extended out 205 miles (330 km) in the southern side of Patty’s circulation.  Winds to tropical storm force extended out 105 miles (165 km) in the northern side of Subtropical Storm Patty.

Subtropical Storm Patty will move through an environment only marginally favorable for intensification during the next 24 hours.  Patty will move over water where the Sea Surface Temperatures are near 21°C.  It will move under the southern part of an upper level low that was part of the old occluded extratropical cyclone.  The upper level low will produce westerly winds that will blow toward the top of Patty’s circulation.  Those winds will cause moderate vertical wind shear and the wind shear will inhibit intensification.  Subtropical Storm Patty could intensify a little during the next 24 hours, but it is likely to start to weaken on Sunday.

The upper level trough will steer Subtropical Storm Patty toward the east-southeast during the next 24 hours.  On its anticipated track, Subtropical Storm Patty will reach the western Azores on Saturday night.  Patty will move across the Azores on Sunday.

Subtropical Storm Patty will bring strong winds and heavy rain to the Azores during Saturday night and Sunday.  Strong winds could cause localized damage and electricity outages.