• MESO: Mesoscale Discussion 1052

    From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Mon Jun 21 20:56:54 2021
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    ACUS11 KWNS 212056
    SWOMCD
    SPC MCD 212056=20
    MEZ000-212230-

    Mesoscale Discussion 1052
    NWS Storm Prediction Center Norman OK
    0356 PM CDT Mon Jun 21 2021

    Areas affected...Northern Maine

    Concerning...Severe potential...Watch possible=20

    Valid 212056Z - 212230Z

    Probability of Watch Issuance...40 percent

    SUMMARY...Supercells are expected to persist into the evening.

    DISCUSSION...Two strong supercells are ongoing across northern
    Maine. The northernmost storm is in a region of weaker instability,
    but has developed a strong mesocyclone and is near the warm front.
    The farther south supercell just entering Maine from Quebec appears
    very healthy with a 2+ inch MRMS MESH signature and an unstable
    downstream airmass. In addition, surface winds are backed in the
    region given the proximity to the warm front which does increase the
    chance of a tornado or two with both storms.=20

    Storm coverage has been isolated thus far and and it is unclear how
    it will evolve through the evening. If the greater threat remains
    confined to one or two supercells, a watch may not be necessary, but
    a greater storm coverage may necessitate a watch.

    ..Bentley/Hart.. 06/21/2021

    ...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!rGZqltgE1suH0lVOsDE3lfiptRMmkAz33739Qk7uNDBUfqA55o8enVQ3rot15grVhtBDmAnn$=
    for graphic product...

    ATTN...WFO...CAR...GYX...

    LAT...LON 46417023 47036974 47516921 47276815 47036772 46246797
    45736867 45346989 45347056 45527083 46417023=20



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