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BULLETIN
Tropical Storm Ida Intermediate Advisory Number 3A
NWS National Hurricane Center Miami FL       AL092021
200 AM EDT Fri Aug 27 2021
 
...CENTER OF IDA PASSING THROUGH THE CAYMAN ISLANDS...
 
 
SUMMARY OF 200 AM EDT...0600 UTC...INFORMATION
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LOCATION...19.4N 80.9W
ABOUT 30 MI...50 KM ENE OF GRAND CAYMAN
ABOUT 310 MI...500 KM ESE OF THE WESTERN TIP OF CUBA
MAXIMUM SUSTAINED WINDS...40 MPH...65 KM/H
PRESENT MOVEMENT...NW OR 320 DEGREES AT 12 MPH...19 KM/H
MINIMUM CENTRAL PRESSURE...1006 MB...29.71 INCHES
 
 
WATCHES AND WARNINGS
--------------------
CHANGES WITH THIS ADVISORY:

None.
 
SUMMARY OF WATCHES AND WARNINGS IN EFFECT:
 
A Storm Surge Watch is in effect for...
* Sabine Pass to Alabama/Florida border
* Vermilion Bay, Lake Borgne, Lake Pontchartrain, Lake Maurepas, and
Mobile Bay
 
A Hurricane Watch is in effect for...
* Cameron, Louisiana to the Mississippi/Alabama border
* Lake Pontchartrain, Lake Maurepas, and Metropolitan New Orleans
 
A Tropical Storm Warning is in effect for...
* Cayman Islands
* Cuban provinces of Matanzas, Mayabeque, Havana, Artemisa, Pinar
del Rio, and the Isle of Youth
 
A Tropical Storm Watch is in effect for...
* Mississippi/Alabama border to the Alabama/Florida border.
 
A Storm Surge Watch means there is a possibility of life-
threatening inundation, from rising water moving inland from the
coastline, in the indicated locations during the next 48 hours.
For a depiction of areas at risk, please see the National Weather
Service Storm Surge Watch/Warning Graphic, available at
hurricanes.gov.
 
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.
 
Interests elsewhere in central and western Cuba, in the northern
Yucatan Peninsula, and elsewhere along the northern U.S. Gulf coast
should monitor the progress of this system.
 
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 of the United States, please monitor products issued by
your national meteorological service.
 
 
DISCUSSION AND OUTLOOK
----------------------
At 200 AM EDT (0600 UTC), the center of Tropical Storm Ida was
located by the weather radar on Grand Cayman near latitude 19.4 
North, longitude 80.9 West. Ida is moving toward the northwest near 
12 mph (19 km/h) and this general motion should continue over the 
next few days.  On the forecast track, the center of Ida will pass 
through the Cayman Islands during the next few hours, pass near 
or over the Isle of Youth and western Cuba later today, and over 
the southeastern and central Gulf of Mexico tonight and Saturday. 
The system is forecast to approach the U.S. northern Gulf coast on 
Sunday.
 
Maximum sustained winds are near 40 mph (65 km/h) with higher
gusts. Ida is forecast to become a hurricane over the southeastern
Gulf of Mexico in a day or two with additional strengthening
expected thereafter. Ida could be near major hurricane strength when
it approaches the northern Gulf coast.
 
Tropical-storm-force winds extend outward up to 70 miles (110 km)
from the center.  An unofficial weather station on Grand Cayman 
recently reported a wind gust of 46 mph (74 km/h).
 
The estimated minimum central pressure is 1006 mb (29.71 inches).  A 
weather station on Grand Cayman recently reported a pressure of 
1007 mb (29.74 inches).
 
 
HAZARDS AFFECTING LAND
----------------------
Key messages for Tropical Storm Ida can be found in the
Tropical Cyclone Discussion under AWIPS header MIATCDAT4, WMO
header WTNT44 KNHC, and on the web at
hurricanes.gov/graphics_at4.shtml?key_messages.
 
STORM SURGE:  A dangerous storm surge will raise water levels by
as much as 2 to 4 feet above normal tide levels in areas of onshore
winds along the immediate coast of the Isle of Youth and near and to
the east of where the center crosses the coast of western Cuba.
Near the coast, the surge will be accompanied by large and
destructive waves.
 
The combination of a dangerous 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 could reach the
following heights above ground somewhere in the indicated areas if
the peak surge occurs at the time of high tide...
 
Morgan City, LA to Ocean Springs, MS including Lake Borgne...7-11 ft
Rockefeller Wildlife Refuge, LA to Morgan City, LA including
Vermilion Bay...4-7 ft
Ocean Springs, MS to MS/AL border...4-7 ft
MS/AL border to AL/FL border including Mobile Bay...3-5 ft
Lake Pontchartrain...3-5 ft
Lake Maurepas...2-4 ft
Sabine Pass to Rockefeller Wildlife Refuge, LA...2-4 ft
 
The deepest water will occur along the immediate coast near and to
the east of the landfall location, where the surge will be
accompanied by large and dangerous 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 office.
 
WIND:  Tropical storm conditions are expected in the Cayman Islands 
this morning, and are expected to reach the Isle of Youth and 
portions of western Cuba in the warning area later today.  Hurricane 
conditions are possible in the hurricane watch area along the 
northern Gulf coast late Saturday night or Sunday and tropical storm 
conditions are possible in the watch area late Saturday night or 
Sunday.
 
RAINFALL:  Tropical Storm Ida is expected to produce total rainfall
accumulations of 6 to 10 inches with maximum totals of 15 inches
across Jamaica.  Rainfall totals of 8 to 12 inches with isolated
maximum amounts of 20 inches are expected across the Cayman Islands
and western Cuba, including the Isle of Youth.  These rainfall
amounts may produce life-threatening flash floods and mudslides.
 
Tropical Storm Ida is likely to bring rainfall amounts of 8 to 12
inches with isolated maximum amounts up to 15 inches along the
central Gulf Coast Sunday into Monday.  This is likely to result in
flash, urban, small stream, and riverine flooding to the central
Gulf Coast.
 
SURF:  Swells generated by this system will affect Jamaica, the
Cayman Islands and Cuba tonight and Friday. Swells will begin
reaching portions of the northern Gulf coast Saturday night or
early Sunday.  These swells are likely to cause life-threatening
surf and rip current conditions. Please consult products from your
local weather office.
 
 
NEXT ADVISORY
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Next complete advisory at 500 AM EDT.
 
$$
Forecaster Beven
 
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