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  • MESO: Mesoscale Discussion 0578

    From COD Weather Processor@1:2320/107 to wx-storm@lists.illinois.edu on Mon Apr 27 22:27:14 2026
    ACUS11 KWNS 272227
    SWOMCD
    SPC MCD 272226=20
    KYZ000-INZ000-280030-

    Mesoscale Discussion 0578
    NWS Storm Prediction Center Norman OK
    0526 PM CDT Mon Apr 27 2026

    Areas affected...southern IN into north-central KY

    Concerning...Severe Thunderstorm Watch 159...

    Valid 272226Z - 280030Z

    The severe weather threat for Severe Thunderstorm Watch 159
    continues.

    SUMMARY...Isolated strong thunderstorms may persist for a few hours
    late this afternoon/early this evening, posing mainly a risk for
    hail and gusty winds. However, the severe risk may increase again
    later tonight.

    DISCUSSION...Convection is ongoing across southern IN along outflow
    north of the Ohio River. Training convection and cloud cover
    extending southward in central KY is limiting instability and
    resulting in at least weak inhibition. Some lingering risk for
    marginally severe hail and gusty winds is expected over the next few
    hours. Later this evening into tonight, airmass recovery is expected
    as stronger warm advection overspreads the lower OH Valley and a
    cold front approaching the Mid-MS Valley advances eastward.=20

    A relative lull in severe potential may develop in the short term
    due to convective contamination. Severe Thunderstorm Watch 159 could
    be locally extended to cover the short term marginal severe
    potential. However, increasing severe potential will likely have to
    be addressed later this evening across portions of the region.

    ..Leitman.. 04/27/2026

    ...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!96h-VuXVfeHmo0gSYwrQipS0vRc6W_KIlKCWhGRceony9dtsmRNc4e0bnBbcXN3Ih-vKVhoZM= khxOjUhCl8DUyXgDAQ$ for graphic product...

    ATTN...WFO...ILN...LMK...IND...PAH...

    LAT...LON 39018496 38298486 37758538 37478628 37698668 38328706
    38848719 39188698 39398649 39298538 39018496=20

    MOST PROBABLE PEAK TORNADO INTENSITY...UP TO 90 MPH
    MOST PROBABLE PEAK WIND GUST...55-70 MPH
    MOST PROBABLE PEAK HAIL SIZE...1.00-1.75 IN


    =3D =3D =3D
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