ZCZC MIATCPAT5 ALL
TTAA00 KNHC DDHHMM
 
BULLETIN
Tropical Storm Tammy Advisory Number   7
NWS National Hurricane Center Miami FL       AL202023
1100 PM AST Thu Oct 19 2023
 
...TAMMY SLOWING DOWN AND REORGANIZING...
...TROPICAL STORM CONDITIONS AND HEAVY RAIN EXPECTED TO BEGIN
TOMORROW FOR PORTIONS OF THE LEEWARD ISLANDS...
 
 
SUMMARY OF 1100 PM AST...0300 UTC...INFORMATION
-----------------------------------------------
LOCATION...13.8N 57.1W
ABOUT 165 MI...270 KM ENE OF BARBADOS
ABOUT 270 MI...430 KM ESE OF MARTINIQUE
MAXIMUM SUSTAINED WINDS...60 MPH...95 KM/H
PRESENT MOVEMENT...WNW OR 290 DEGREES AT 10 MPH...17 KM/H
MINIMUM CENTRAL PRESSURE...1001 MB...29.56 INCHES
 
 
WATCHES AND WARNINGS
--------------------
CHANGES WITH THIS ADVISORY:
 
The government of St. Maarten has issued a Hurricane Watch
for St. Maarten.
 
The government of France has issued a Hurricane Watch for St.
Martin and St. Barthelemy.
 
SUMMARY OF WATCHES AND WARNINGS IN EFFECT:
 
A Hurricane Watch is in effect for...
* Guadeloupe
* Antigua and Barbuda, Montserrat, St. Kitts and Nevis, and Anguilla
* St. Maarten
* St. Martin and St. Barthelemy
 
A Tropical Storm Warning is in effect for...
* Dominica
* Guadeloupe
* Antigua and Barbuda, Montserrat, St. Kitts and Nevis, and Anguilla
* St. Maarten
* St. Martin and St. Barthelemy
 
A Tropical Storm Watch is in effect for...
* Barbados
* Martinique
* Saba and St. Eustatius
 
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
dangerous.
 
A Tropical Storm Warning means that tropical storm conditions are
expected somewhere within the warning area within 36 hours.
 
A Tropical Storm Watch means that tropical storm conditions are
possible within the watch area, generally within 48 hours.
 
Additional watches and warnings could be required tomorrow.
 
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 Tropical Storm Tammy was 
located near latitude 13.8 North, longitude 57.1 West. Tammy is 
moving toward the west-northwest near 10 mph (17 km/h). A gradual 
turn to the northwest with some additional slowdown is forecast on 
Friday, and this motion should continue through Saturday.  A more 
northward motion is forecast to begin Saturday night or Sunday.  On 
the forecast track, the center of Tammy will move near or over the 
Leeward Islands Friday and Saturday, and then move north of the 
Leeward Islands Saturday night and Sunday.
 
Data from the NOAA reconnaissance aircraft indicate that the maximum 
sustained winds remain near 60 mph (95 km/h) with higher gusts. 
Gradual strengthening is expected to begin on Friday and continue 
into this weekend. Tammy is forecast to be at or near hurricane 
intensity when it moves near the Leeward Islands Friday night and 
Saturday.
 
Tropical-storm-force winds extend outward up to 125 miles (205 km)
from the center.
 
The estimated minimum central pressure is 1001 mb (29.56 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 tomorrow.  Hurricane conditions
are possible in portions of the Leeward Islands Friday night and
Saturday. Tropical storm conditions are possible within the tropical
storm watch area beginning tomorrow.
 
RAINFALL: Tammy is expected to produce the following storm total
rainfall:
 
Leeward Islands: 4 to 8 inches with maximum amounts of 12 inches
 
Northern 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.
 
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 Papin
 
NNNN