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Tropical Storm Isaac Intermediate Advisory Number 22A
NWS National Hurricane Center Miami FL AL092018
200 AM AST Thu Sep 13 2018
...NOAA HURRICANE HUNTER AIRCRAFT FINDS ISAAC A LITTLE WEAKER...
...HEAVY RAINS AND TROPICAL-STORM-FORCE WINDS EXPECTED OVER PORTIONS
OF THE LEEWARD ISLANDS ON THURSDAY...
SUMMARY OF 200 AM AST...0600 UTC...INFORMATION
ABOUT 170 MI...275 KM E OF DOMINICA
ABOUT 185 MI...300 KM ESE OF GUADELOUPE
MAXIMUM SUSTAINED WINDS...45 MPH...75 KM/H
PRESENT MOVEMENT...W OR 270 DEGREES AT 20 MPH...31 KM/H
MINIMUM CENTRAL PRESSURE...1006 MB...29.71 INCHES
WATCHES AND WARNINGS
CHANGES WITH THIS ADVISORY:
SUMMARY OF WATCHES AND WARNINGS IN EFFECT:
A Tropical Storm Warning is in effect for...
A Tropical Storm Watch is in effect for...
* St. Kitts and Nevis
* Saba and St. Eustatius
* St. Martin and St. Maarten
A Tropical Storm Warning means that tropical storm conditions are
expected somewhere within the warning area, in this case within 12
A Tropical Storm Watch means that tropical storm conditions are
possible within the watch area, in this case within 12 hours.
Interests elsewhere in the Leeward Islands should monitor the
progress of Isaac.
For storm information specific to your area, please monitor
products issued by your national meteorological service.
DISCUSSION AND OUTLOOK
At 200 AM AST (0600 UTC), the center of Tropical Storm Isaac was
located near latitude 15.3 North, longitude 58.8 West. Isaac is
moving toward the west near 20 mph (31 km/h), and this general
motion with a decrease in forward is expected to continue through
the weekend. On the forecast track, Isaac is forecast to move
across the central Lesser Antilles and into the eastern Caribbean
Sea later today, and then move across the eastern and central
Caribbean Sea through the weekend.
Data from a NOAA Hurricane Hunter aircraft indicate that the maximum
sustained winds have decreased to near 45 mph (75 km/h) with higher
gusts. A continued gradual decrease in the winds is forecast during
the next few days.
Tropical-storm-force winds extend outward up to 175 miles (280 km)
to the north of the center.
Recent data from the NOAA aircraft indicate that the minimum
pressure is 1006 mb (29.71 inches).
HAZARDS AFFECTING LAND
RAINFALL: Isaac is expected to produce total rainfall accumulations
of 2 to 4 inches with isolated amounts up to 8 inches across
Martinique, Dominica, and Guadeloupe. Rainfall of 1 to 2 inches
with isolated amounts to 4 inches are forecast across Puerto Rico
and the southern United States Virgin Islands, with up to an inch
anticipated across the remaining Windward and Leeward Islands. This
rainfall may cause life-threatening flash flooding.
WIND: Tropical storm conditions are expected within the tropical
storm warning area later this morning through the afternoon.
Tropical storm conditions are possible within the tropical storm
watch area, beginning later this morning.
STORM SURGE: Some coastal flooding is possible in areas of onshore
winds. Near the coast, the surge will be accompanied by large
SURF: Swells generated by Isaac are affecting portions of the
Lesser Antilles. These swells are likely to cause life-threatening
surf and rip current conditions. Please consult products from your
local weather office.
Next complete advisory at 500 AM AST.