216
WTNT34 KNHC 042051
TCPAT4

BULLETIN
Tropical Storm Debby Advisory Number 10
NWS National Hurricane Center Miami FL AL042024
500 PM EDT Sun Aug 04 2024

...DEBBY EXPECTED TO BECOME A HURRICANE TONIGHT AND MAKE LANDFALL
IN THE FLORIDA BIG BEND AREA ON MONDAY...
...WILL BRING A MAJOR FLOOD THREAT TO THE SOUTHEASTERN UNITED
STATES...

SUMMARY OF 500 PM EDT...2100 UTC...INFORMATION ----------------------------------------------
LOCATION...27.7N 84.4W
ABOUT 120 MI...190 KM W OF TAMPA FLORIDA
ABOUT 125 MI...200 KM SW OF CEDAR KEY FLORIDA
MAXIMUM SUSTAINED WINDS...65 MPH...100 KM/H
PRESENT MOVEMENT...N OR 360 DEGREES AT 12 MPH...19 KM/H
MINIMUM CENTRAL PRESSURE...992 MB...29.30 INCHES

WATCHES AND WARNINGS
--------------------
CHANGES WITH THIS ADVISORY:
The Storm Surge Watch from the mouth of the Saint Mary's River to
South Santee River South Carolina has been changed to a Storm Surge
Warning.

The Hurricane Warning is extended west of the Ochlockonee River to
Indian Pass.

The Tropical Storm Watch from west of Indian Pass to Mexico Beach
Florida has been changed to a Tropical Storm Warning.

A Tropical Storm Warning has been issued for Florida and Georgia
coast from Ponte Vedre Beach to the Savannah River.

The Tropical Storm Warning for the Dry Tortugas is discontinued.

The Tropical Storm Warning south of Bonita Beach Florida is
discontinued.

SUMMARY OF WATCHES AND WARNINGS IN EFFECT:

A Storm Surge Warning is in effect for...
* Florida coast from the middle of Longboat Key northward to Indian
Pass including Tampa Bay
* Georgia and South Carolina coast from the Mouth of the St. Mary's
River to South Santee River South Carolina

A Storm Surge Watch is in effect for...
* Florida coast from Bonita Beach northward to the middle of
Longboat Key, including Charlotte Harbor

A Hurricane Warning is in effect for...
* Florida coast from the Suwannee River to Indian Pass

A Hurricane Watch is in effect for...
* Florida coast south of the Suwannee River to Yankeetown

A Tropical Storm Warning is in effect for...
* Florida coast south of the Suwannee River to Bonita Beach
* Florida coast from west of Indian Pass to Mexico Beach
* Ponte Vedre Beach to the Savannah River

A Tropical Storm Watch is in effect for...
* Savannah River to South Santee River South 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 Tropical Storm Warning means that tropical storm conditions are
expected somewhere within the warning area within 36 hours.

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.

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 Storm Surge Watch means there is a possibility of life-
threatening inundation, from rising water moving inland from the
coastline. For a depiction of areas at risk, please see the National
Weather Service Storm Surge Watch/Warning Graphic, available at
hurricanes.gov.

Interests elsewhere in Florida and the southeastern coast of the
United States should monitor the progress of this system.
Additional watches and warnings will likely be required later today
or tonight.

For storm information specific to your area, including possible
inland watches and warnings, please monitor products issued by your
local National Weather Service forecast office.

DISCUSSION AND OUTLOOK
----------------------
At 500 PM EDT (2100 UTC), the center of Tropical Storm Debby was
located near latitude 27.7 North, longitude 84.4 West. Debby is
moving toward the north near 12 mph (19 km/h). A gradual decrease
in forward speed with a turn toward the northeast and east is
expected on Monday and Tuesday. On the forecast track, the center
will move across the northeastern Gulf of Mexico through tonight and
reach the Florida Big Bend coast around midday Monday. Debby is
then expected to move slowly across northern Florida and southern
Georgia Monday and Tuesday.

Maximum sustained winds are near 65 mph (100 km/h) with higher
gusts. Rapid strengthening is forecast, and Debby is expected to
become a hurricane tonight, with additional strengthening likely
before it reaches the Florida Big Bend coast on Monday. Weakening
is expected on Monday and Tuesday after Debby moves inland.

Tropical-storm-force winds extend outward up to 140 miles (220 km)
from the center.

The estimated minimum central pressure is 992 mb (29.30 inches).

HAZARDS AFFECTING LAND
----------------------
Key messages for Debby can be found in the Tropical Cyclone
Discussion under AWIPS header MIATCDAT4 and WMO header WTNT44 KNHC.

WIND: Hurricane conditions are expected in the hurricane warning
area and possible in the hurricane watch area early Monday, with
tropical storm conditions expected to arrive this evening. Tropical
storm conditions are expected to spread northward over the tropical
storm warning area along the Gulf coast through tonight, and begin
along portions of the tropical storm warning area along the Atlantic
coast by late Monday. Tropical storm conditions are possible along
the coast of South Carolina within the tropical storm watch area
late Monday night.

STORM SURGE: The combination of storm surge and 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...

Suwannee River to Ochlockonee River, FL...6-10 ft
Yankeetown, FL to Suwannee River, FL...5-8 ft
Ochlockonee River, FL to Indian Pass, FL...4-6 ft
Tampa Bay...3-5 ft
Middle of Longboat Key, FL to Yankeetown, FL...3-5 ft
Bonita Beach, FL to Middle of Longboat Key, FL...2-4 ft
Mouth of the St. Mary's River to South Santee River, SC...2-4 ft
Charlotte Harbor...2-4 ft

For a complete depiction of areas at risk of storm surge inundation,
please see the National Weather Service Peak Storm Surge Graphic,
available at hurricanes.gov/graphics_at4.shtml?peakSurge.

RAINFALL: Debby is expected to produce rainfall totals of 6 to 12
inches, with maximum amounts of 18 inches, across portions of
northern Florida and southeastern North Carolina through Friday
morning. This rainfall will likely result in areas of considerable
flash and urban flooding, with significant river flooding expected.

Across portions of southeast Georgia and South Carolina, 10 to 20
inches of rainfall, with local amounts to 30 inches, are expected
through Friday morning. This potentially historic rainfall will
likely result in areas of catastrophic flooding.

For western Cuba, additional rainfall amounts of 1 to 2 inches, with
localized higher amounts, will be possible through today. This will
result in isolated to scattered areas of flooding.

For a complete depiction of forecast rainfall and flash flooding
associated with Tropical Storm Debby, please see the National
Weather Service Storm Total Rainfall Graphic, available at hurricanes.gov/graphics_at4.shtml?rainqpf and the Flash Flood Risk
graphic at hurricanes.gov/graphics_at4.shtml?ero

TORNADOES: A few tornadoes are possible over central and northern
Florida and southern Georgia tonight and Monday. The threat will
spread northeastward into coastal Georgia and parts of South
Carolina on Monday.

SURF: Swells generated by Debby are expected to affect much of the
Gulf coast of Florida through Monday. Swells will begin to affect
the Southeast U.S. coast on Monday and continue through the middle
of the week. These conditions 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 800 PM EDT.
Next complete advisory at 1100 PM EDT.

$$
Forecaster Pasch
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