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Hurricane Irma Advisory Number 28
NWS National Hurricane Center Miami FL AL112017
1100 PM AST Tue Sep 05 2017
...POTENTIALLY CATASTROPHIC CATEGORY 5 HURRICANE IRMA GETTING VERY
CLOSE TO THE NORTHERN LEEWARD ISLANDS...
SUMMARY OF 1100 PM AST...0300 UTC...INFORMATION
ABOUT 50 MI...80 KM ENE OF ANTIGUA
ABOUT 50 MI...75 KM ESE OF BARBUDA
MAXIMUM SUSTAINED WINDS...185 MPH...295 KM/H
PRESENT MOVEMENT...WNW OR 285 DEGREES AT 15 MPH...24 KM/H
MINIMUM CENTRAL PRESSURE...916 MB...27.05 INCHES
WATCHES AND WARNINGS
CHANGES WITH THIS ADVISORY:
SUMMARY OF WATCHES AND WARNINGS IN EFFECT:
A Hurricane Warning is in effect for...
* Antigua, Barbuda, Anguilla, Montserrat, St. Kitts, and Nevis
* Saba, St. Eustatius, and Sint Maarten
* Saint Martin and Saint Barthelemy
* British Virgin Islands
* U.S. Virgin Islands
* Puerto Rico, Vieques, and Culebra
* Dominican Republic from Cabo Engano to the northern border with
A Hurricane Watch is in effect for...
* Haiti from the northern border with the Dominican Republic to Le
Mole St. Nicholas
* Turks and Caicos Islands
* Southeastern Bahamas
* Cuba from Matanzas province eastward to Guantanamo province
A Tropical Storm Warning is in effect for...
* Dominican Republic from south of Cabo Engano westward to the
southern border with Haiti
A Tropical Storm Watch is in effect for...
* Haiti from south of Le Mole St. Nicholas to Port-Au-Prince
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 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 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, generally within 48 hours.
Interests elsewhere in the Dominican Republic and Haiti, as
well as Cuba, the central and northwestern Bahamas, and Florida
should monitor the progress of Irma.
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 1100 PM AST (0300 UTC), the eye of Hurricane Irma was located
near latitude 17.4 North, longitude 61.1 West. Irma is moving
toward the west-northwest near 15 mph (24 km/h), and this motion is
expected to continue for the next couple of days. On the forecast
track, the extremely dangerous core of Irma will move over portions
of the northern Leeward Islands tonight and early Wednesday, move
near or over portions of the northern Virgin Islands Wednesday, and
pass near or just north of Puerto Rico late Wednesday and Wednesday
Maximum sustained winds remain near 185 mph (295 km/h) with higher
gusts. Irma is a category 5 hurricane on the Saffir-Simpson
Hurricane Wind Scale. Some fluctuations in intensity are likely
during the next day or two, but Irma is forecast to remain a
powerful category 4 or 5 hurricane during the next couple of days.
Hurricane-force winds extend outward up to 50 miles (85 km) from the
center and tropical-storm-force winds extend outward up to 175 miles
The minimum central pressure estimated from Air Force and NOAA
Hurricane Hunter aircraft observations is 916 mb (27.05 inches).
HAZARDS AFFECTING LAND
STORM SURGE: The combination of a life-threatening storm surge and
large breaking waves will raise water levels ABOVE NORMAL TIDE
LEVELS by the following amounts within the hurricane warning area
near and to the north of the center of Irma. Near the coast, the
surge will be accompanied by large and destructive waves.
Northern Leeward Islands...7 to 11 ft
Turks and Caicos Islands...15 to 20 ft
Southeastern Bahamas...15 to 20 ft
Northern coast of the Dominican Republic...3 to 5 ft
Northern coast of Haiti and the Gulf of Gonave...1 to 3 ft
The combination of a life-threatening storm surge and the tide will
cause normally dry areas near the coast to be flooded by rising
waters moving inland from the shoreline. The water is expected to
reach the following HEIGHTS ABOVE GROUND if the peak surge occurs at
the time of high tide...
British and U.S. Virgin Islands except St. Croix...7 to 11 ft
Northern coast of Puerto Rico...3 to 5 ft
Southern coast of Puerto Rico and St. Croix...1 to 2 ft
The deepest water will occur along the immediate coast in areas of
onshore winds, where the surge will be accompanied by large and
destructive waves. Surge-related flooding depends on the relative
timing of the surge and the tidal cycle, and can vary greatly over
short distances. For information specific to your area, please see
products issued by your local National Weather Service forecast
WIND: Hurricane conditions are expected within the hurricane
warning area in the Leeward Islands tonight, with tropical storm
conditions beginning within a couple of hours. Hurricane
conditions are expected to begin within the hurricane warning area
in the British and U.S. Virgin Islands and Puerto Rico on Wednesday,
with tropical storm conditions beginning tonight. Hurricane
conditions are expected to begin within the hurricane warning area
in the Dominican Republic early Thursday, with tropical storm
conditions beginning Wednesday night.
Hurricane and tropical storm conditions are possible within the
watch area in Haiti, the Turks and Caicos Islands, and the
southeastern Bahamas by early Thursday.
RAINFALL: Irma is expected to produce the following rain
accumulations through Thursday:
Northern Leeward Islands...8 to 12 inches, isolated 20 inches
Northeast Puerto Rico and the British and U.S. Virgin Islands
except St. Croix...4 to 10 inches, isolated 15 inches
Southwest Puerto Rico, the southern Leeward Islands, and
St. Croix...2 to 4 inches
Irma is expected to produce the following rain accumulations
Wednesday through Saturday:
Southeast Bahamas and Turks and Caicos...8 to 12 inches, isolated 20
Northern Dominican Republic and northern Haiti...4 to 10 inches,
isolated 15 inches
Southwest Haiti...1 to 4 inches
These rains could cause life-threatening flash floods and mudslides.
SURF: Swells generated by Irma will affect the northern Leeward
Islands, Puerto Rico, the Virgin Islands, the southeastern Bahamas,
the Turks and Caicos Islands, and the northern coast of the
Dominican Republic during the next several days. 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 AM AST.
Next complete advisory at 500 AM AST.