NWS National Hurricane Center Miami FL
1100 AM AST Thu Sep 13, 2018
…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 centre 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 centre.
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 across Martinique, Dominica, and Guadeloupe, especially over elevated terrain. Rainfall totals 1 to 2 inch 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 dangerous flash flooding.
WIND: Tropical storm conditions are occurring 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.
Source: The Daily Herald https://www.thedailyherald.sx/islands/80599-tropical-storm-isaac-advisory-number-24