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  • Atlantic Post-Tropical Cyclone Ana Discussion Number 8



    660
    WTNT41 KNHC 240242
    TCDAT1

    Post-Tropical Cyclone Ana Discussion Number 8
    NWS National Hurricane Center Miami FL AL012021
    1100 PM AST Sun May 23 2021

    Ana has mainly remained devoid of deep and organized convection
    today, with only a couple of short-lived bursts noted in satellite
    imagery earlier this morning. The cyclone has been an exposed cloud
    swirl through the afternoon and evening hours, and Ana continues
    moving into a hostile environment characterized by cool sea-surface
    temperatures, dry mid-level air, and increasing vertical wind shear.
    Thus, Ana has become a post-tropical cyclone, and this will be the
    final NHC advisory on the system.

    Although a recent ASCAT-B pass missed the center of post-tropical
    Ana, it still shows an area of 30-35 kt winds in the southeast
    quadrant of the low near the edge of the swath. Therefore, the
    initial intensity is set at 35 kt, with the slightly stronger winds
    likely just a product of the accelerating forward speed of the
    system. The post-tropical cyclone is embedded in deep-layer
    southwesterly flow and will continue to accelerate northeastward
    until it opens up into a trough and becomes absorbed by a strong
    baroclinic zone approaching from the northwest on Monday.

    Additional information on post-tropical Ana can be found in High
    Seas Forecasts issued by the National Weather Service, under AWIPS
    header NFDHSFAT1, WMO header FZNT01 KWBC, and online at
    ocean.weather.gov/shtml/NFDHSFAT1.php


    FORECAST POSITIONS AND MAX WINDS

    INIT 24/0300Z 38.3N 55.2W 35 KT 40 MPH...POST-TROPICAL
    12H 24/1200Z 41.0N 50.5W 30 KT 35 MPH...POST-TROP/REMNT LOW
    24H 25/0000Z...DISSIPATED

    $$
    Forecaster Reinhart/Brown