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.