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  • Atlantic Post-Tropical Cyclone Wanda Discussion Number 31



    000
    WTNT41 KNHC 071447
    TCDAT1

    Post-Tropical Cyclone Wanda Discussion Number 31
    NWS National Hurricane Center Miami FL AL212021
    300 PM GMT Sun Nov 07 2021

    Wanda is no longer generating deep convection in association with
    its low-level circulation. In fact, most of the colder cloud tops
    seen on satellite over the center right now are actually upper-level
    cirrus associated with a cold frontal boundary part of a
    larger mid-latitude cyclone southeast of Greenland. In addition, an
    1156 UTC ASCAT-B pass over Wanda's circulation shows that the north
    side is beginning to open up into a trough as the cold front is
    encroaching on the system. These above factors suggest that Wanda is
    no longer a tropical cyclone, and the system is now classified as a
    post-tropical low as of this advisory. The winds remain 35-kt based
    on the peak wind retrieval of 33-kt from the scatterometer data on
    the southeast side of the circulation.

    The system has been accelerating to the northeast with the latest
    estimated motion at 045/22 kt. The post-tropical cyclone should
    continue to accelerate to the northeast until it merges with
    the baroclinic zone approaching it. A 12 hour point is provided for
    continuity and to indicate the transition to an extratropical
    cyclone, though its quite possible the system will be fully
    absorbed by the frontal boundary by then. The track guidance at
    12 hours is tightly clustered, and the NHC track forecast at that
    time fame follows the consensus aids closely.

    This is the last NHC advisory on Wanda. Additional information on
    this system can be found in High Seas Forecasts issued by Meteo
    France under WMO header FQNT50 LFPW and available on the web at
    www.meteofrance.com/previsions-meteo-marine/bulletin/grandlarge/
    metarea2.


    FORECAST POSITIONS AND MAX WINDS

    INIT 07/1500Z 40.2N 33.5W 35 KT 40 MPH...POST-TROPICAL
    12H 08/0000Z 43.5N 29.1W 35 KT 40 MPH...POST-TROP/EXTRATROP
    24H 08/1200Z...DISSIPATED

    $$
    Forecaster Papin

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