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  • ADVISORY: Post-tropical Cyclone Isaias Advisory Number 20

    From COD Weather Processor @1:2320/107 to All on Sun Oct 11 15:00:46 2026
    692
    WTNT34 KWNH 111500
    TCPAT4

    BULLETIN
    Post-Tropical Cyclone Isaias Advisory Number 20
    NWS Weather Prediction Center College Park MD AL092026
    1100 AM EDT Sun Oct 11 2026

    ...FLASH FLOOD THREAT FROM ISAIAS IS DECREASING BUT SOME
    RISK CONTINUES TODAY ACROSS PORTIONS OF THE APPALACHIANS AND
    MID-ATLANTIC...


    SUMMARY OF 1100 AM EDT...1500 UTC...INFORMATION -----------------------------------------------
    LOCATION...37.5N 84.0W
    ABOUT 180 MI...285 KM NE OF NASHVILLE TENNESSEE
    MAXIMUM SUSTAINED WINDS...25 MPH...35 KM/H
    PRESENT MOVEMENT...ENE OR 65 DEGREES AT 22 MPH...35 KM/H
    MINIMUM CENTRAL PRESSURE...1010 MB...29.83 INCHES


    WATCHES AND WARNINGS
    --------------------
    SUMMARY OF WATCHES AND WARNINGS IN EFFECT:

    Flood Watches are in effect for...
    * Portions of the Central and Southern Appalachians

    Wind Advisory is in effect for...
    * Portions of the Central Appalachians


    DISCUSSION AND OUTLOOK
    ----------------------
    At 1100 AM EDT (1500 UTC), the center of Post-Tropical Cyclone
    Isaias was located near latitude 37.5 North, longitude 84.0 West.
    The post-tropical cyclone is moving toward the east-northeast near
    22 mph (35 km/h) and this motion is expected to continue today
    before the low dissipates over West Virginia this evening.

    Maximum sustained winds are near 25 mph (35 km/h) with higher gusts.
    Little change in strength is forecast during the next 12 hours,
    with the low dissipating thereafter.

    The estimated minimum central pressure is 1010 mb (29.83 inches).


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

    RAINFALL: Additional rainfall of 1 to 3 inches is possible today
    across portions of the Central Appalachians into the Mid-Atlantic,
    with localized flash and urban flooding possible. In western North
    Carolina, rainfall is diminishing, but rapid river rises and
    flooding remain possible today.

    For a complete depiction of forecast rainfall associated with
    Isaias, 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
    with Isaias, see the companion storm summary at WBCSCCNS4 with the
    WMO header ACUS44 KWBC or at the following link: https://urldefense.com/v3/__http://www.wpc.ncep.noaa.gov/discussions/nfdscc4.html__;!!DZ3fjg!7DS9LChgNTQGSUPkjhkcGYJCYLB1R5As6BJ4m4dO42g17tsA5Hz_sDcS6IUUOYiDPIw1dlCj5YKDrHyuMK1ZmCDSVSg$ .

    TORNADOES: A couple of tornadoes are possible today across the
    Piedmont and Coastal Plain of Virginia and North Carolina.

    SURF: Swells from Isaias will continue to affect much of the
    Gulf and Southeast coasts of the United States today. These swells
    are likely to cause life-threatening surf and rip current
    conditions. Please consult products from your local weather office.

    A depiction of rip current risk for the United States can be found
    at: hurricanes.gov/graphics_at4.shtml?ripCurrents


    NEXT ADVISORY
    -------------
    This is the last public advisory issued by the Weather Prediction
    Center on this system.

    $$
    Forecaster Chenard
    = = = = = = =
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    --- scorpsmtpd
    * Origin: capitolcityonline.net * KY, USA (1:2320/107)