BULLETIN
Hurricane Isaias Advisory Number 15
NWS National Hurricane Center Miami FL AL092020
500 PM EDT Fri Jul 31 2020
...HURRICANE WARNING ISSUED FOR PORTIONS OF THE FLORIDA EAST
COAST...
...TROPICAL STORM CONDITIONS AND HEAVY RAINS CONTINUE TO SPREAD
ACROSS THE CENTRAL BAHAMAS...
SUMMARY OF 500 PM EDT...2100 UTC...INFORMATION
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LOCATION...22.6N 75.7W
ABOUT 195 MI...320 KM SSE OF NASSAU
ABOUT 330 MI...535 KM SE OF FREEPORT GRAND BAHAMA ISLAND
MAXIMUM SUSTAINED WINDS...75 MPH...120 KM/H
PRESENT MOVEMENT...NW OR 305 DEGREES AT 15 MPH...24 KM/H
MINIMUM CENTRAL PRESSURE...991 MB...29.27 INCHES
WATCHES AND WARNINGS
--------------------
CHANGES WITH THIS ADVISORY:
A Hurricane Warning is in effect for the east coast of Florida from
Boca Raton to the Volusia/Brevard County Line.
A Hurricane Watch is in effect from the Volusia/Brevard County Line
to the Flagler/Volusia County Line and from south of Boca Raton to
Hallendale Beach.
A Storm Surge Watch is in effect for the east coast of Florida from
Jupiter Inlet to Ponte Vedre Beach.
A Tropical Storm Watch is in effect from the Flagler/Volusia County
Line to Ponte Vedre Beach.
A Tropical Storm Warning is in effect for Lake Okeechobee.
SUMMARY OF WATCHES AND WARNINGS IN EFFECT:
A Hurricane Warning is in effect for...
* Boca Raton to the Volusia/Brevard County Line Florida
* Northwestern Bahamas
* Southeastern Bahamas
* Central Bahamas
A Hurricane Watch is in effect for...
* Hallendale Beach to south of Boca Raton Florida
* Volusia-Brevard County Line to the Flagler/Volusia County Line
A Storm Surge Watch is in effect for...
* Jupiter Inlet to Ponte Vedre Beach Florida
A Tropical Storm Warning is in effect for...
* Turks and Caicos Islands
* North of Ocean Reef to south of Boca Raton Florida
* Lake Okeechobee
A Tropical Storm Watch is in effect for...
* Flagler/Volusia County Line to Ponte Vedre Beach Florida
Interests elsewhere along the southeast coast of the United States
should monitor the progress of Isaias. Additional watches or
warnings may be required later tonight and Saturday.
A Hurricane Warning means that hurricane conditions are expected
somewhere within the warning area. A warning is typically issued
36 hours before the anticipated first occurrence of
tropical-storm-force winds, conditions that make outside
preparations difficult or dangerous. Preparations to protect life
and property should be rushed to completion.
A Hurricane Watch means that hurricane conditions are possible
within the watch area. A watch is typically issued 48 hours
before the anticipated first occurrence of tropical-storm-force
winds, conditions that make outside preparations difficult or
dangerous.
A Storm Surge Watch means there is a possibility of life-
threatening inundation, from rising water moving inland from the
coastline, in the indicated locations during the next 48 hours.
For a depiction of areas at risk, please see the National Weather
Service Storm Surge Watch/Warning Graphic, available at
hurricanes.gov.
A Tropical Storm Warning means that tropical storm conditions are
expected somewhere within the warning area within 36 hours.
A Tropical Storm Watch means that tropical storm conditions are
possible within the watch area, generally within 48 hours.
For storm information specific to your area in the United
States, including possible inland watches and warnings, please
monitor products issued by your local National Weather Service
forecast office. For storm information specific to your area
outside of the United States, please monitor products issued by
your national meteorological service.
DISCUSSION AND OUTLOOK
----------------------
At 500 PM EDT (2100 UTC), the center of Hurricane Isaias was located
by satellite imagery and Bahamas radar data near latitude 22.6
North, longitude 75.7 West. Isaias is moving toward the northwest
near 15 mph (24 km/h), and a general northwestward motion with some
decrease in forward speed is expected for the next day or so,
followed by a turn toward the north-northwest by late Sunday. On
the forecast track, the center of Isaias will continue to move near
or over the Southeastern Bahamas this afternoon and evening. Isaias
is forecast to be near the Central Bahamas tonight, and move near or
over the Northwestern Bahamas Saturday and near the east coast of
the Florida peninsula Saturday afternoon through Sunday.
Maximum sustained winds are near 75 mph (120 km/h) with higher
gusts. Strengthening is expected later tonight and early Saturday,
and Isaias is forecast to remain a hurricane for the next couple of
days.
Hurricane-force winds extend outward up to 35 miles (55 km) from the
center and tropical-storm-force winds extend outward up to 175 miles
(280 km). A private weather observing station at Pitts Town Point,
Bahamas, recently reported a sustained wind of 37 mph (59 km/h).
The estimated minimum central pressure is 991 mb (29.27 inches).