Issued at 1100 PM AST Fri Oct 20 2023
000
WTNT35 KNHC 210254
TCPAT5
BULLETIN
Hurricane Tammy Advisory Number 11
NWS National Hurricane Center Miami FL
AL202023
1100 PM AST Fri Oct 20 2023
...TAMMY A LITTLE STRONGER WHILE PASSING JUST EAST OF MARTINIQUE...
...HEAVY RAINFALL AND FLOODING LIKELY OVER MUCH OF THE LESSER
ANTILLES...
SUMMARY OF 1100 PM AST...0300 UTC...INFORMATION
-----------------------------------------------
LOCATION...14.7N 60.2W
ABOUT 55 MI...85 KM E OF MARTINIQUE
ABOUT 135 MI...220 KM SE OF GUADELOUPE
MAXIMUM SUSTAINED WINDS...80 MPH...130 KM/H
PRESENT MOVEMENT...WNW OR 295 DEGREES AT 9 MPH...15 KM/H
MINIMUM CENTRAL PRESSURE...992 MB...29.30 INCHES
WATCHES AND WARNINGS
--------------------
CHANGES WITH THIS ADVISORY:
The government of Barbados has discontinued the Tropical Storm
Watch for Barbados.
SUMMARY OF WATCHES AND WARNINGS IN EFFECT:
A Hurricane Warning is in effect for...
* Guadeloupe
* Antigua, Barbuda, Montserrat, St. Kitts, Nevis, and Anguilla
* St. Maarten
* St. Martin and St. Barthelemy
A Hurricane Watch is in effect for...
* Dominica
A Tropical Storm Warning is in effect for...
* Dominica
* Saba and St. Eustatius
A Tropical Storm Watch is in effect for...
* Martinique
A Hurricane Warning means that hurricane conditions are expected
somewhere within the warning area, in this case within the next 24
hours. Preparations to protect life and property should be rushed
to completion.
A Hurricane Watch means that hurricane conditions are possible
within the watch area, in this case within the next 24 hours.
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.
For storm information specific to your area, please monitor
products issued by your national meteorological service.
DISCUSSION AND OUTLOOK
----------------------
At 1100 PM AST (0300 UTC), the center of Hurricane Tammy was located
near latitude 14.7 North, longitude 60.2 West. Tammy is moving
toward the west-northwest near 9 mph (15 km/h). A turn toward the
northwest is anticipated tonight, followed by a north-northwestward
and northward turn Saturday night through Sunday night. On the
forecast track, the center of Tammy will move near or over portions
of the Leeward Islands tonight through Saturday night, and then move
north of the northern Leeward Islands on Sunday.
Maximum sustained winds have increased to near 80 mph (130 km/h)
with higher gusts. Some additional strengthening is forecast during
the next day or so while the hurricane moves near or over portions
of the Leeward Islands.
Hurricane-force winds extend outward up to 25 miles (35 km) from the
center and tropical-storm-force winds extend outward up to 125 miles
(205 km).
The minimum central pressure estimated from Hurricane Hunter
aircraft observations is 992 mb (29.30 inches).
HAZARDS AFFECTING LAND
----------------------
Key messages for Tammy can be found in the Tropical Cyclone
Discussion under AWIPS header MIATCDAT5 and WMO header WTNT45 KNHC
and on the web at hurricanes.gov/text/MIATCDAT5.shtml
WIND: Tropical storm conditions are expected within the tropical
storm warning area beginning tonight. Hurricane conditions are
expected in the hurricane warning area by late tonight or early
Saturday. Hurricane conditions are possible in the hurricane watch
area in the Leeward Islands on Saturday. Tropical storm conditions
are possible within the tropical storm watch area beginning tonight.
RAINFALL: Tammy is expected to produce the following storm total
rainfall:
Leeward Islands: 4 to 8 inches with maximum amounts of 12 inches.
Portions of the Windward Islands: 2 to 4 inches with maximum amounts
of 6 inches.
British and U.S. Virgin Islands into eastern Puerto Rico: 1 to 2
inches with maximum amounts of 4 inches.
These rains may produce isolated flash and urban flooding, along
with isolated mudslides in areas of higher terrain.
STORM SURGE: Storm surge could raise water levels by as much as 1
to 3 feet above normal tide levels near where the center of Tammy
moves across the Leeward Islands. Near the coast, the surge will
be accompanied by large and dangerous waves.
SURF: Swells generated by Tammy will continue to affect portions of
the Lesser Antilles during the next few days. These swells are
likely to cause life-threatening surf and rip current conditions.
Please consult products from your local weather office.
NEXT ADVISORY
-------------
Next intermediate advisory at 200 AM AST.
Next complete advisory at 500 AM AST.
$$
Forecaster Pasch
Click here to read more at The National Hurricane Center
