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Hurricane ISAIAS (Text)


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Hurricane Isaias Intermediate Advisory Number 18A
NWS National Hurricane Center Miami FL       AL092020
200 PM EDT Sat Aug 01 2020
 
...ISAIAS EMERGING OVER THE STRAITS OF FLORIDA...
...EXPECTED TO APPROACH THE SOUTHEAST COAST OF FLORIDA TONIGHT...
 
 
SUMMARY OF 200 PM EDT...1800 UTC...INFORMATION
----------------------------------------------
LOCATION...24.9N 78.4W
ABOUT 115 MI...185 KM S OF FREEPORT GRAND BAHAMA ISLAND
ABOUT 140 MI...225 KM SE OF FORT LAUDERDALE FLORIDA
MAXIMUM SUSTAINED WINDS...75 MPH...120 KM/H
PRESENT MOVEMENT...NW OR 305 DEGREES AT 12 MPH...19 KM/H
MINIMUM CENTRAL PRESSURE...990 MB...29.23 INCHES
 
 
WATCHES AND WARNINGS
--------------------
CHANGES WITH THIS ADVISORY:
 
None.
 
SUMMARY OF WATCHES AND WARNINGS IN EFFECT:
 
A Hurricane Warning is in effect for...
* Boca Raton to the Volusia/Flagler County Line Florida
* Northwestern Bahamas
 
A Hurricane Watch is in effect for...
* Hallandale Beach to south of Boca Raton Florida
 
A Storm Surge Watch is in effect for...
* Jupiter Inlet to Ponte Vedra Beach Florida
 
A Tropical Storm Warning is in effect for...
* North of Ocean Reef to south of Boca Raton Florida
* Lake Okeechobee
* Volusia/Flagler County Line to Ponte Vedra Beach Florida
 
A Tropical Storm Watch is in effect for...
* North of Ponte Vedra Beach Florida to Altamaha Sound Georgia
 
Interests elsewhere along the southeast coast of the United States
should monitor the progress of Isaias.  Additional watches or
warnings may be required later today.
 
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, in this case within the
next 12 to 24 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 200 PM EDT (1800 UTC), the center of Hurricane Isaias was located
by an Air Force Reserve Hurricane Hunter aircraft and the Miami NOAA
Doppler weather radar near latitude 24.9 North, longitude 78.4 West.
Isaias is moving toward the northwest near 12 mph (19 km/h). A
general northwestward motion with some decrease in forward speed is
expected for the next day or so, followed by a north-northwestward
motion by late Sunday. On the forecast track, the center of Isaias
will move over the Straits of Florida tonight, and approach the
southeast coast of Florida early Sunday morning.  Isaias is then
forecast to move near or along the the east coast of the Florida
peninsula Sunday and Sunday night.
 
Data from the reconnaissance aircraft and Doppler radar indicate 
that maximum sustained winds have decreased to near 75 mph (120 
km/h) with higher gusts. Although Isaias has weakened after passing 
over Andros Island, some re-strengthening is expected tonight and 
Sunday morning when the cyclone will be moving over the warm waters 
of the Straits of Florida and the Gulf Stream. Isaias is forecast to 
remain a hurricane through Monday, followed by slow weakening 
beginning Monday night or Tuesday.
 
Hurricane-force winds extend outward up to 25 miles (35 km) from
the center and tropical-storm-force winds extend outward up to 115
miles (185 km). A wind gust to 49 mph (80 km/h) was recently
observed at Nassau, Bahamas. Doppler radar indicates that 
tropical-storm-force winds are located just offshore Broward and
Miami-Dade Counties.
 
The estimated minimum central pressure is 990 mb (29.23 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 Northwestern Bahamas.
 
WIND:  Hurricane conditions will continue to spread over the
Northwestern Bahamas through today.
 
Hurricane conditions are expected to reach the coast within the
hurricane warning area in Florida tonight and will spread northward
through Sunday. Winds are expected to first reach tropical storm
strength later today, making outside preparations difficult or
dangerous. Preparations to protect life and property should be
rushed to completion.  Tropical storm conditions are expected within
the tropical storm warning area, and are possible within the watch
area, over southern Florida by this afternoon or evening.
 
Tropical storm conditions are expected in the warning area in
northeast Florida by late Sunday, and are possible in the watch
area in northeast Florida and southeast Georgia by Monday morning.
 
RAINFALL: Isaias is expected to produce the following rain
accumulations:
 
Bahamas: 4 to 8 inches, with isolated maximum totals of 12 inches.
 
Cuba: 1 to 2 inches, with isolated maximum totals of 4 inches.
 
Eastern 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.
 
Across the Northeast, from eastern Pennsylvania into New Jersey,
southeast New York, and much of New England: 2 to 4 inches, with
isolated maximum totals of 6 inches.
 
Heavy rainfall from Isaias could result in potentially life- 
threatening flash flooding in the Bahamas and flash and urban 
flooding, especially in low-lying and poorly drained areas in 
eastern Florida and across the Carolinas to the Mid-Atlantic and 
Northeast. Minor river flooding is possible across portions of the 
Carolinas and into Virginia.
 
SURF:  Swells generated by Isaias are affecting portions of
Hispaniola, eastern Cuba, the Turks and Caicos, and the Bahamas.
These swells will spread along the east coast of Florida and the
southeastern United States coast today.  These swells are likely to
cause life-threatening surf and rip current conditions. Please
consult products from your local weather office.
 
 
NEXT ADVISORY
-------------
Next complete advisory at 500 PM EDT.
 
$$
Forecaster Stewart
 
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Page last modified: Friday, 30-Oct-2020 12:09:16 UTC