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BULLETIN
Hurricane Idalia Advisory Number  12
NWS National Hurricane Center Miami FL       AL102023
1100 AM EDT Tue Aug 29 2023
 
...IDALIA STRENGTHENING...
...LIFE-THREATENING STORM SURGE AND HURRICANE CONDITIONS EXPECTED
ALONG PORTIONS OF THE GULF COAST OF FLORIDA TONIGHT AND WEDNESDAY...
 
 
SUMMARY OF 1100 AM EDT...1500 UTC...INFORMATION
-----------------------------------------------
LOCATION...24.6N 84.8W
ABOUT 120 MI...190 KM W OF THE DRY TORTUGAS
ABOUT 275 MI...440 KM SSW OF TAMPA FLORIDA
MAXIMUM SUSTAINED WINDS...85 MPH...140 KM/H
PRESENT MOVEMENT...N OR 5 DEGREES AT 14 MPH...22 KM/H
MINIMUM CENTRAL PRESSURE...976 MB...28.82 INCHES
 
 
WATCHES AND WARNINGS
--------------------
CHANGES WITH THIS ADVISORY:
 
A Tropical Storm Warning has been issued from Altamaha Sound,
Georgia, northward to South Santee River, South Carolina.
 
A Tropical Storm Watch has been issued from South Santee River
northward to Surf City, North Carolina.
 
SUMMARY OF WATCHES AND WARNINGS IN EFFECT:
 
A Storm Surge Warning is in effect for...
* Englewood northward to Indian Pass, including Tampa Bay
 
A Hurricane Warning is in effect for...
* Cuban province of Pinar del Rio
* Middle of Longboat Key northward to Indian Pass, including Tampa
Bay
 
A Tropical Storm Warning is in effect for...
* Isle of Youth Cuba
* Dry Tortugas Florida
* Chokoloskee northward to the Middle of Longboat Key
* West of Indian Pass to Mexico Beach
* Sebastian Inlet Florida to South Santee River South Carolina
 
A Storm Surge Watch is in effect for...
* Chokoloskee northward to Englewood, including Charlotte Harbour
* Mouth of the St. Mary's River to South Santee River South
Carolina
 
A Hurricane Watch is in effect for...
* Englewood to the Middle of Longboat Key
 
A Tropical Storm Watch is in effect for...
* Lower Florida Keys west of the west end of the Seven Mile Bridge
* South Santee River northward to Surf City North Carolina
 
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 Storm Surge Warning means there is a danger of life-threatening
inundation, from rising water moving inland from the coastline,
during the next 36 hours in the indicated locations. For a
depiction of areas at risk, please see the National Weather
Service Storm Surge Watch/Warning Graphic, available at
hurricanes.gov.  This is a life-threatening situation.  Persons
located within these areas should take all necessary actions to
protect life and property from rising water and the potential for
other dangerous conditions.  Promptly follow evacuation and other
instructions from local officials.
 
A Tropical Storm Warning means that tropical storm conditions are
expected somewhere within the warning area.
 
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 Tropical Storm Watch means that tropical storm conditions are
possible within the watch area, generally within 48 hours.
 
Interests elsewhere along the southeastern U.S. coast should
monitor the progress of this system.  Additional watches and
warnings will likely be required later today.
 
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 1100 AM EDT (1500 UTC), the center of Hurricane Idalia was
located near latitude 24.5 North, longitude 84.8 West.  Idalia is
moving toward the north near 14 mph (22 km/h).  A faster motion
toward the north and north-northeast is expected through early
Wednesday while Idalia approaches the Gulf coast of Florida.  A
turn toward the northeast and east-northeast is forecast late
Wednesday and Thursday, bringing the center of Idalia near or along
the coasts of Georgia and the Carolinas.
 
Maximum sustained winds have increased to near 85 mph (140 km/h)
with higher gusts.  Rapid intensification is expected before
landfall, and Idalia is forecast to be a major hurricane when it
reaches the Gulf coast of Florida Wednesday morning.
 
Hurricane-force winds extend outward up to 15 miles (30 km) from the
center and tropical-storm-force winds extend outward up to 160 miles
(260 km).
 
The estimated minimum central pressure from NOAA Hurricane Hunter 
aircraft data is 976 mb (28.82 inches).
 
 
HAZARDS AFFECTING LAND
----------------------
Key messages for Idalia 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
 
STORM SURGE:  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...
 
Aucilla River, FL to Yankeetown, FL...10-15 ft
Yankeetown to Chassahowitzka, FL...7-11 ft
Chassahowitzka, FL to Anclote River, FL...6-9 ft
Ochlockonee River, FL to Aucilla River, FL...6-9 ft
Anclote River, FL to Middle of Longboat Key, FL...4-7 ft
Tampa Bay...4-7 ft
Carrabelle, FL to Ochlockonee River, FL...4-7 ft
Middle of Longboat Key, FL to Englewood, FL...3-5 ft
Englewood, FL to Chokoloskee, FL...2-4 ft
Charlotte Harbor...2-4 ft
Indian Pass, FL to Carrabelle, FL...3-5 ft
Mouth of the St. Mary's River to South Santee, SC...2-4 ft
South Santee, SC to Surf City, NC...1-3 ft
Chokoloskee, FL to East Cape Sable, FL...1-3 ft
Flagler/Volusia County Line, FL to Mouth of St. Mary's River...1-3
ft
Indian Pass to Mexico Beach...1 to 3 ft.
Florida Keys...1-2 ft
 
The deepest water will occur along the immediate coast in areas of
onshore winds, where the surge will be accompanied by large and
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.
 
Elevated water levels along the southern coast of Pinar del Rio,
Cuba will gradually subside today.
 
WIND:  Hurricane and tropical storm conditions are expected to
continue within the warning areas in western Cuba for the next few
hours.
 
Hurricane conditions are expected within the hurricane warning area
in Florida by tonight or early Wednesday, with tropical storm
conditions beginning today.
 
Tropical storm conditions are likely beginning in the Dry Tortugas
and will begin within the tropical storm warning area along the
Florida Gulf coast and the Florida west coast later today.
 
Tropical storm conditions are expected to begin on Wednesday in the
warning area along the east coast of Florida, Georgia, and South
Carolina.  Tropical storm conditions are possible within the watch
area in South and North Carolina Wednesday night and Thursday.
 
RAINFALL:  Idalia is expected to produce the following rainfall 
amounts:

Western Cuba: 4 to 7 inches, with isolated higher totals of 10 
inches.

Portions of the west coast of Florida, the Florida Panhandle, 
southeast Georgia and the eastern Carolinas: 4 to 8 inches from 
Tuesday into Thursday. Isolated higher totals of 12 inches possible, 
primarily near landfall in northern Florida.

This rainfall may lead to flash and urban flooding, and landslides 
across western Cuba. 

Areas of flash and urban flooding, some of which may be locally 
significant, are expected across portions of the west coast of 
Florida, the Florida Panhandle, and southern Georgia Tuesday into 
Wednesday, spreading into portions of the eastern Carolinas 
Wednesday into Thursday.
 
SURF:  Swells generated by Idalia are affecting portions of the
southern coast of Cuba and eastern Yucatan.  These swells will
spread northward along the eastern United States Gulf Coast during
the next day or two. These swells are likely to cause life-
threatening surf and rip current conditions.  Please consult
products from your local weather office.
 
TORNADOES: A few tornadoes will be possible along the west central 
Florida coast through tonight.  The tornado threat will also spread 
northward into the Florida Big Bend tonight, and toward southeast 
Georgia and the coastal Carolinas Wednesday.
 
 
NEXT ADVISORY
-------------
Next intermediate advisory at 200 PM EDT.
Next complete advisory at 500 PM EDT.
 
$$
Forecaster Berg
 
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