Tropical Storm Isaias Public Advisory

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000
WTNT34 KNHC 302340
TCPAT4

BULLETIN
Tropical Storm Isaias Intermediate Advisory Number 10A
NWS National Hurricane Center Miami FL       AL092020
800 PM EDT Thu Jul 30 2020

...ISAIAS NEAR THE NORTH COAST OF THE DOMINICAN REPUBLIC...
...HURRICANE WARNINGS ISSUED FOR THE NORTHWESTERN BAHAMAS...


SUMMARY OF 800 PM EDT...0000 UTC...INFORMATION
----------------------------------------------
LOCATION...19.9N 71.2W
ABOUT 45 MI...70 KM WNW OF PUERTO PLATA DOMINICAN REPUBLIC
ABOUT 155 MI...245 KM ESE OF GREAT INAGUA ISLAND
MAXIMUM SUSTAINED WINDS...60 MPH...95 KM/H
PRESENT MOVEMENT...NW OR 310 DEGREES AT 20 MPH...31 KM/H
MINIMUM CENTRAL PRESSURE...999 MB...29.50 INCHES


WATCHES AND WARNINGS
--------------------
CHANGES WITH THIS ADVISORY:

The government of the Bahamas has issued a Hurricane Warning
for the Northwestern Bahamas.

SUMMARY OF WATCHES AND WARNINGS IN EFFECT:

A Hurricane Warning is in effect for...
* Northwestern Bahamas including Andros Island, New Providence,
Eleuthera, Abacos Islands, Berry Islands, Grand Bahamas Island, and
Bimini

A Tropical Storm Warning is in effect for...
* Dominican Republic entire southern and northern coastlines
* North coast of Haiti from Le Mole St Nicholas eastward to the
northern border with the Dominican Republic
* Turks and Caicos Islands
* Southeastern Bahamas including the Acklins, Crooked Island, Long
Cay, the Inaguas, Mayaguana, and the Ragged Islands
* Central Bahamas, including Cat Island, the Exumas, Long Island,
Rum Cay, and San Salvador

A Tropical Storm Watch is in effect for...
* East coast of Florida from Ocean Reef to Sebastian Inlet

Interests elsewhere along the southeast coast of the United
States should monitor the progress of this system.  Additional
watches or warnings may be required for a portion of the Florida
peninsula tonight or Friday.

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 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 800 PM EDT (0000 UTC), the center of Tropical Storm Isaias was
located near latitude 19.9 North, longitude 71.2 West. Isaias is
moving toward the northwest near 20 mph (31 km/h), and a
northwestward motion with some decrease in forward speed is expected
over the next couple of days.  On the forecast track, the center of
Isaias will move near the Southeastern Bahamas by late tonight.
Isaias is forecast to be near the Central Bahamas Friday night and
move near or over the Northwestern Bahamas and near South Florida on
Saturday.

Maximum sustained winds are near 60 mph (95 km/h) with higher
gusts.  Strengthening is forecast during the next day or so, and
Isaias is forecast to become a hurricane on Friday or Friday night.

Tropical-storm-force winds extend outward up to 240 miles (390 km)
from the center.

The estimated minimum central pressure is 999 mb (29.50 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:  A dangerous storm surge will raise water levels by as
much as 3 to 5 feet above normal tide levels in areas of onshore
flow in the central and northwest Bahamas.  Storm surge will raise
water level by as much as 1 to 3 ft above normal tide levels in the
southeastern Bahamas.

WIND:  Tropical storm conditions will continue to spread across
portions of the Dominican Republic, Haiti, the southeastern Bahamas
and Turks and Caicos within the warning area tonight. Tropical storm
conditions are expected to begin in the central Bahamas Friday
morning and spread into the northwestern Bahamas beginning late
Friday.  Hurricane conditions are expected within portions of the
the northwestern Bahamas Friday night and Saturday.

Tropical storm conditions are possible in the watch area in Florida
beginning Saturday.

RAINFALL: Isaias is expected to produce the following rain
accumulations:

Puerto Rico, Dominican Republic and northern Haiti: 4 to 8 inches,
with isolated maximum totals of 12 inches.

Bahamas, Turks and Caicos: 4 to 8 inches.

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

These rainfall amounts will lead to life-threatening flash flooding
and mudslides, as well as river flooding.  Urban and small stream
flooding is expected for the U.S. Virgin Islands, eastern and
southwestern Puerto Rico, and Hispaniola.

Heavy rains associated with Isaias may begin to affect eastern
Florida over the weekend.  This rain could result in isolated flash
and urban flooding, especially in low-lying and poorly drained
areas.

SURF:  Swells generated by Isaias are affecting portions of
the Leeward Islands, the Virgin Islands, Puerto Rico, the Dominican
Republic, the Turks and Caicos Islands and the southeastern
Bahamas. These swells will spread along the coast of Cuba and into
the central and northwestern Bahamas over the next day or two.
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 1100 PM EDT.

$$
Forecaster Pasch



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