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Hurricane Maria Intermediate Advisory Number 7A
NWS National Hurricane Center Miami FL AL152017
200 AM AST Mon Sep 18 2017
...STRENGTHENING MARIA EXPECTED TO BECOME A MAJOR HURRICANE BY THE
TIME IT REACHES THE LEEWARD ISLANDS...
SUMMARY OF 200 AM AST...0600 UTC...INFORMATION
ABOUT 90 MI...145 KM NNE OF BARBADOS
ABOUT 170 MI...270 KM ESE OF DOMINICA
MAXIMUM SUSTAINED WINDS...90 MPH...150 KM/H
PRESENT MOVEMENT...WNW OR 290 DEGREES AT 13 MPH...20 KM/H
MINIMUM CENTRAL PRESSURE...977 MB...28.85 INCHES
WATCHES AND WARNINGS
CHANGES WITH THIS ADVISORY:
SUMMARY OF WATCHES AND WARNINGS IN EFFECT:
A Hurricane Warning is in effect for...
* St. Kitts, Nevis, and Montserrat
A Tropical Storm Warning is in effect for...
* Antigua and Barbuda
* Saba and St. Eustatius
* St. Lucia
A Hurricane Watch is in effect for...
* U.S. Virgin Islands
* British Virgin Islands
* Saba and St. Eustatius
* St. Maarten
* St. Martin and St. Barthelemy
A Tropical Storm Watch is in effect for...
* St. Vincent and the Grenadines
A Hurricane Warning means that hurricane conditions are expected
somewhere within the warning area. 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 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
A Tropical Storm Watch means that tropical storm conditions are
possible within the watch area, generally within 48 hours.
Interests elsewhere in the Lesser Antilles, Puerto Rico, and the
Dominican Republic should monitor the progress of this system.
Additional Hurricane and Tropical storm Warnings may be issued for
portion of the Leeward and Virgin Islands on today, and
Hurricane Watches will likely be issued for Puerto Rico and the
nearby islands this morning.
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
the United States, please monitor products issued by your national
DISCUSSION AND 48-HOUR OUTLOOK
At 200 AM AST (0600 UTC), the center of Hurricane Maria was located
by Martinique radar near latitude 14.4 North, longitude 59.0 West.
Maria is moving toward the west-northwest near 13 mph (20 km/h), and
this motion with a decrease in forward speed is expected through
Tuesday night. On the forecast track, the center of Maria will move
across the Leeward Islands late today and tonight and then over the
extreme northeastern Caribbean Sea Tuesday and Tuesday night.
Maximum sustained winds have increased to near 90 mph (150 km/h)
with higher gusts. Rapid strengthening is forecast during the next
48 hours, and Maria is expected to become a major hurricane before
it moves through the Leeward Islands.
Hurricane-force winds extend outward up to 15 miles (30 km) from
the center and tropical-storm-force winds extend outward up to 105
miles (165 km).
The estimated minimum central pressure is 977 mb (28.85 inches).
HAZARDS AFFECTING LAND
WIND: Hurricane conditions are first expected within portions of
the Leeward Islands by late today, with tropical storm conditions
beginning during the day today. Hurricane conditions are possible
within the hurricane watch area by Tuesday, with tropical storm
conditions possible tonight. Tropical storm conditions are possible
in the tropical storm watch area through tonight.
STORM SURGE: A dangerous storm surge accompanied by large and
destructive waves will raise water levels by as much as 5 to 7 feet
above normal tide levels near where the center of Maria moves
across the Leeward Islands.
RAINFALL: Maria is expected to produce total rain accumulations of
6 to 12 inches with isolated maximum amounts of 20 inches across the
central and southern Leeward Islands, including Puerto Rico and the
U.S. and British Virgin Islands, through Wednesday night. Maria is
also expected to produce total rain accumulations of 2 to 4 inches
with isolated maximum amounts of 8 inches over the remaining
northern Leeward Islands from Barbuda to Anguilla, as well as the
Windward Islands and Barbados. Rainfall on all of these islands
could cause life-threatening flash floods and mudslides.
SURF: Swells generated by Maria are affecting the Lesser Antilles.
These swells are likely to cause life-threatening surf and rip
current conditions. Please consult products from your local
Next complete advisory at 500 AM AST.