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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
----------------------------------------------
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).
 
 
HAZARDS AFFECTING LAND
----------------------
Key messages for Isaias can be found in the Tropical Cyclone
Discussion under AWIPS header MIATCDAT4, WMO header WTNT44 KNHC, and
on the web at www.hurricanes.gov/text/MIATCDAT4.shtml.
 
STORM SURGE:  The combination of a dangerous storm surge and the
tide will cause normally dry areas near the coast to be flooded by
rising waters moving inland from the shoreline.  The water could
reach the following heights above ground somewhere in the indicated
areas if the peak surge occurs at the time of high tide...

Jupiter Inlet to Ponte Vedra Beach FL...2-4 ft
North Miami Beach to Jupiter Inlet FL...1-3 ft

The deepest water will occur along the immediate coast near and to 
the right of the center, where the surge will be accompanied by 
large waves.  Surge-related flooding depends on the relative timing 
of the surge and the tidal cycle, and can vary greatly over short 
distances.  For information specific to your area, please see 
products issued by your local National Weather Service forecast 
office.

A dangerous storm surge will raise water levels by as
much as 3 to 5 feet above normal tide levels in areas of onshore
winds in the Bahamas.
 
WIND:  Hurricane conditions will continue to spread northwestward 
into the central and northwestern Bahamas tonight and Saturday.
 
Hurricane conditions are expected to reach the coast within the 
hurricane warning area in Florida late Saturday and Saturday night. 
Winds are expected to first reach tropical storm strength on  
Saturday, making outside preparations difficult or dangerous.  
Preparations to protect life and property should be rushed to 
completion.
 
RAINFALL: Isaias is expected to produce the following rain 
accumulations:

Bahamas, Turks and Caicos: 4 to 8 inches.

Cuba: 1 to 2 inches, with isolated maximum totals of 4 inches.

These rainfall amounts could lead to life-threatening flash  and 
urban flooding, especially in low-lying and poorly drained areas.

From Friday night through Tuesday:

South Florida into east-Central Florida: 2 to 4 inches, with 
isolated maximum totals of 6 inches.

Northeast Florida into coastal Georgia: 1 to 2 inches.

Carolinas into the mid Atlantic, including the southern and central 
Appalachians: 2 to 4 inches, with isolated maximum totals of 6 
inches.

Heavy rainfall from Isaias could result in isolated flash and urban 
flooding, especially in low-lying and poorly drained areas. Isolated 
minor river flooding is possible across the eastern Carolinas and 
into Virginia.
 
SURF:  Swells generated by Isaias are affecting portions of 
Hispaniola, eastern Cuba, the Turks and Caicos, and the southeastern 
and central Bahamas. These swells will spread along the east coast 
of Florida and the southeastern United States coast on Saturday. 
These swells are likely to cause life-threatening surf and rip 
current conditions. Please consult products from your local 
weather office.
 
 
NEXT ADVISORY
-------------
Next intermediate advisory at 800 PM EDT.
Next complete advisory at 1100 PM EDT.
 
$$
Forecaster Stewart
 
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