Atlantic Hurricane Feed

Hurricane Helene Public Advisory

Published Date and Time: 2024-09-26 01:56:21



000
WTNT34 KNHC 260556
TCPAT4

BULLETIN
Hurricane Helene Intermediate Advisory Number 11A
NWS National Hurricane Center Miami FL       AL092024
100 AM CDT Thu Sep 26 2024

...HELENE MOVING NORTHWARD AND EXPECTED TO BRING CATASTROPHIC WINDS 
AND STORM SURGE TO THE NORTHEASTERN GULF COAST...
...PREPARATIONS TO PROTECT LIFE AND PROPERTY SHOULD BE RUSHED TO
COMPLETION...


SUMMARY OF 100 AM CDT...0600 UTC...INFORMATION
----------------------------------------------
LOCATION...23.7N 86.5W
ABOUT 385 MI...620 KM SW OF TAMPA FLORIDA
ABOUT 425 MI...680 KM SSW OF APALACHICOLA FLORIDA
MAXIMUM SUSTAINED WINDS...85 MPH...140 KM/H
PRESENT MOVEMENT...N OR 5 DEGREES AT 12 MPH...19 KM/H
MINIMUM CENTRAL PRESSURE...971 MB...28.67 INCHES


WATCHES AND WARNINGS
--------------------
CHANGES WITH THIS ADVISORY:

None.

SUMMARY OF WATCHES AND WARNINGS IN EFFECT:

A Storm Surge Warning is in effect for...
* Mexico Beach eastward and southward to Flamingo
* Tampa Bay
* Charlotte Harbor

A Hurricane Warning is in effect for...
* Anclote River to Mexico Beach

A Hurricane Watch is in effect for...
* Englewood to Anclote River, including Tampa Bay

A Tropical Storm Warning is in effect for...
* Florida Keys, including the Dry Tortugas
* Flamingo to Anclote River, including Tampa Bay
* West of Mexico Beach to the Okaloosa/Walton County Line
* Flamingo northward to Little River Inlet
* Lake Okeechobee
* Cuban provinces of Artemisa, Pinar del Rio, and the Isle of Youth

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 Hurricane Warning means that hurricane conditions are expected
somewhere within the warning area.  A warning is typically issued
36 hours before the anticipated first occurrence of
tropical-storm-force winds, conditions that make outside
preparations difficult or dangerous.  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 the next 36 hours.

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.

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 100 AM CDT (0600 UTC), the center of Hurricane Helene was located
near latitude 23.7 North, longitude 86.5 West. Helene is moving
toward the north near 12 mph (19 km/h).  A northward or
north-northeastward motion at a faster forward speed is expected
during the next 36 hours.  On the forecast track, Helene will move
across the eastern Gulf of Mexico today and cross the Florida Big 
Bend coast this evening.  After landfall, Helene is expected to 
turn northwestward and slow down over the Tennessee Valley on 
Friday and Saturday.

Maximum sustained winds are near 85 mph (140 km/h) with higher
gusts.  Strengthening is forecast, and Helene is expected to be a
major hurricane when it reaches the Florida Big Bend coast this
evening.  Weakening is expected after landfall, but Helene's fast
forward speed will allow strong, damaging winds, especially in
gusts, to penetrate well inland across the southeastern United
States, including over the higher terrain of the southern
Appalachians.

Hurricane-force winds extend outward up to 35 miles (55 km) from
the center and tropical-storm-force winds extend outward up to 345
miles (555 km).  The NOAA automated station at Sand Key, Florida 
recently reported sustained winds of 45 mph (72 km/h).

The estimated minimum central pressure from Air Force Reserve 
Hurricane Hunter aircraft data is 971 mb (28.67 inches).


HAZARDS AFFECTING LAND
----------------------
Key Messages for Helene can be found in the Tropical Cyclone
Discussion under AWIPS header MIATCDAT4 and WMO header WTNT44 KNHC
and on the web at hurricanes.gov/text/MIATCDAT4.shtml

STORM SURGE: The combination of a life-threatening 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...

Carrabelle, FL to Suwannee River, FL...15-20 ft
Apalachicola, FL to Carrabelle, FL...10-15 ft
Suwannee River, FL to Chassahowitzka, FL...10-15 ft
Chassahowitzka, FL to Anclote River, FL...8-12 ft
Indian Pass, FL to Apalachicola, FL...6-10 ft
Anclote River, FL to Middle of Longboat Key, FL...5-8 ft
Tampa Bay...5-8 ft
Middle of Longboat Key, FL to Englewood, FL...4-7 ft
East of Mexico Beach, FL to Indian Pass, FL...3-5 ft
Englewood, FL to Flamingo, FL...3-5 ft
Charlotte Harbor...3-5 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.

Storm surge could raise water levels by as much as 2 to 4 feet above
normal tide levels in areas of onshore winds along the southern
coast of Pinar del Rio, Cuba, including the Isle of Youth.

WIND: Hurricane conditions are expected within the U.S. hurricane
warning area late today, with tropical storm conditions beginning 
this morning.  Tropical storm conditions are expected in southern 
Florida this morning and will spread northward across the rest of 
Florida, Georgia, and South Carolina through tonight.

Tropical storm conditions are expected over portions of the warning
area in western Cuba during the next several hours.

RAINFALL: Hurricane Helene is expected to produce total rain
accumulations of 4 to 8 inches over western Cuba, the Cayman Islands
and the northeast Yucatan Peninsula, with isolated totals around 12
inches. This rainfall brings a risk of considerable flooding.

Over portions of the Southeastern U.S. into the Southern
Appalachians, Helene is expected to produce total rain accumulations
of 6 to 12 inches with isolated totals around 18 inches. This
rainfall will likely result in catastrophic and potentially
life-threatening flash and urban flooding, along with significant
river flooding. Numerous landslides are expected in steep terrain
across the southern Appalachians.

For a complete depiction of forecast rainfall associated with
Hurricane Helene, 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 tornado or two may occur this morning over parts of 
Florida. The risk for tornadoes will increase later today, expanding
northward across Florida into parts of Georgia and South Carolina.

SURF: Swells generated by Helene will affect the southern coast of
Cuba and the Yucatan Peninsula of Mexico during the next couple of
days.  Swells will spread northward toward the west coast of Florida
and the northeastern Gulf Coast today. These swells are likely to 
cause life-threatening surf and rip current conditions.  Please 
consult products from your local weather office.


NEXT ADVISORY
-------------
Next complete advisory at 400 AM CDT.

$$
Forecaster Beven



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