• TS Helene Winds and Flood

    From Mike Powell@618:250/1 to All on Friday, September 27, 2024 08:01:00
    503
    WTNT34 KNHC 271152
    TCPAT4

    BULLETIN
    Tropical Storm Helene Intermediate Advisory Number 16A
    NWS National Hurricane Center Miami FL AL092024
    800 AM EDT Fri Sep 27 2024

    ...HELENE PRODUCING DAMAGING GUSTY WINDS AND LIFE-THREATENING
    FLOODING OVER PORTIONS OF THE SOUTHEAST AND SOUTHERN APPALACHIANS...

    ...FLASH FLOOD EMERGENCY IN EFFECT FOR METROPOLITAN ATLANTA...

    SUMMARY OF 800 AM EDT...1200 UTC...INFORMATION ----------------------------------------------
    LOCATION...34.2N 83.0W
    ABOUT 35 MI...60 KM SSW OF CLEMSON SOUTH CAROLINA
    ABOUT 80 MI...130 KM ENE OF ATLANTA GEORGIA
    MAXIMUM SUSTAINED WINDS...60 MPH...95 KM/H
    PRESENT MOVEMENT...N OR 360 DEGREES AT 30 MPH...48 KM/H
    MINIMUM CENTRAL PRESSURE...972 MB...28.70 INCHES

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

    The Tropical Storm Warning along the Florida Gulf Coast from the
    mouth of the Suwannee River to Indian Pass has been discontinued.
    The Tropical Storm Warning along the east coast of Florida and
    extreme southeastern Georgia from the Flagler/Volusia County Line
    to Altamaha Sound has been discontinued.

    The Storm Surge Warning for the Florida coast has been discontinued
    south of the Middle of Longboat Key.

    SUMMARY OF WATCHES AND WARNINGS IN EFFECT:

    A Storm Surge Warning is in effect for...
    * Indian Pass to Middle of Longboat Key, Florida
    * Tampa Bay

    A Tropical Storm Warning is in effect for...
    * Altamaha Sound northward to Little River Inlet

    A Storm Surge Warning means there is a danger 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. This is a life-threatening situation.

    A Tropical Storm Warning means that tropical storm conditions are
    expected somewhere within the warning area.

    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.

    DISCUSSION AND OUTLOOK
    ----------------------
    At 800 AM EDT (1200 UTC), the center of Tropical Storm Helene was
    located near latitude 34.2 North, longitude 83.0 West. Helene is
    moving toward the north near 30 mph (48 km/h). Helene is expected
    to turn northwestward and slow down over the Tennessee Valley later
    today and Saturday.

    Maximum sustained winds have decreased to near 60 mph (95 km/h)
    with higher gusts. Continued weakening is expected, and Helene is
    expected to become a post-tropical low this afternoon or tonight.
    However, damaging wind gusts will penetrate far inland across the
    southeastern United States, including over the higher terrain of the
    southern Appalachians.

    Tropical-storm-force winds extend outward up to 275 miles (445 km)
    mainly to the east of the center. An observation in Brasstown
    Bald, Georgia recently reported a wind gust of 72 mph (116 km/h).
    An observation in Dewees Island, South Carolina, recently reported
    a sustained wind of 46 mph (74 km/h) and a gust of 62 mph (100 km/h).

    The minimum central pressure based on surface observations is
    972 mb (28.70 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...

    Aucilla River, FL to Chassahowitzka, FL...5-10 ft
    Indian Pass, FL to Aucilla River, FL...3-6 ft
    Chassahowitzka, FL to Anclote River, FL...3-5 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.

    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.

    WIND: Tropical storm conditions are occurring along much of the
    Georgia and South Carolina coasts, and these conditions will
    continue for the next several hours. Strong, damaging winds,
    especially in gusts, will also continue as far inland as the higher
    terrain of the southern Appalachians.

    RAINFALL: 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 20 inches. This
    rainfall will likely result in catastrophic and potentially
    life-threatening flash and urban flooding, along with significant
    and record river flooding. Numerous significant 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.

    For a list of rainfall observations (and wind reports) associated
    this storm, see the companion storm summary at WBCSCCNS4 with the
    WMO header ACUS44 KWBC or at the following link: http://www.wpc.ncep.noaa.gov/discussions/nfdscc4.html .

    TORNADOES: Tornadoes are possible this morning over parts of eastern
    Georgia, and through this afternoon over the Carolinas and southern Virginia.

    SURF: Swells generated by Helene will affect the coasts of Georgia
    and the Carolinas during the next day or so. 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 1100 AM EDT.

    $$
    Forecaster Cangialosi/Harrigan
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