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Tropical Storm Isaac Advisory Number 24...Corrected
NWS National Hurricane Center Miami FL AL092018
1100 AM AST Thu Sep 13 2018
Corrected for Puerto Rico rainfall in the Hazards section
...ISAAC NOW MOVING ACROSS THE EASTERN CARIBBEAN SEA...
SUMMARY OF 1100 AM AST...1500 UTC...INFORMATION
ABOUT 50 MI...75 KM SW OF DOMINICA
ABOUT 100 MI...160 KM SSW OF GUADELOUPE
MAXIMUM SUSTAINED WINDS...45 MPH...75 KM/H
PRESENT MOVEMENT...W OR 265 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.
A Tropical Storm Watch means that tropical storm conditions are
possible within the watch area.
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 1100 AM AST (1500 UTC), the center of Tropical Storm Isaac was
located by NOAA Hurricane Hunter aircraft data and surface
observations near latitude 14.9 North, longitude 61.8 West. Isaac is
moving toward the west near 20 mph (31 km/h). A westward track with
a slower forward motion is forecast to continue for the next few
days. On the forecast track, Isaac should move farther away from
Lesser Antilles today, and then move across the eastern and central
Caribbean Sea through the weekend.
Maximum sustained winds remain near 45 mph (75 km/h) with higher
gusts. Little change in strength is expected over the next several
hours as Isaac moves through the Leeward Islands. Gradual weakening
is forecast after that as Isaac moves through the eastern Caribbean.
Tropical-storm-force winds extend outward up to 160 miles (260 km)
from the center.
The estimated minimum central pressure from NOAA Hurricane Hunter
aircraft data and surface observations is 1006 mb (29.71 inches).
HAZARDS AFFECTING LAND
RAINFALL: Tropical Storm Isaac is expected to produce total
rainfall accumulations of 2 to 4 inches with isolated amounts up to
8 to 10 inches over Dominica. Rainfall amounts of 2 to 4 inches
with isolated amounts up to 6 inches over elevated terrain are
forecast across Martinique, Dominica, and Guadeloupe. Rainfall
totals of 2 to 4 inches with isolated amounts of 6 inches are
forecast across southeastern Puerto Rico, while totals of 1 to 2
inches with maximum amounts of 3 inches are possible across the
remainder of Puerto Rico and the U.S. Virgin Islands. This rainfall
may cause dangerous flash flooding.
WIND: Tropical storm conditions are occuring within portions of the
warning area and should continue through the afternoon hours.
Tropical storm conditions are possible within the watch area today.
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 intermediate advisory at 200 PM AST.
Next complete advisory at 500 PM AST.