• MESO: Mesoscale Discussion 1630

    From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Wednesday, November 07, 2018 19:55:28
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    ACUS11 KWNS 071855
    SWOMCD
    SPC MCD 071854
    ALZ000-MSZ000-LAZ000-072100-

    Mesoscale Discussion 1630
    NWS Storm Prediction Center Norman OK
    1254 PM CST Wed Nov 07 2018

    Areas affected...Portions of southern LA/MS

    Concerning...Severe potential...Watch unlikely

    Valid 071854Z - 072100Z

    Probability of Watch Issuance...5 percent

    SUMMARY...Isolated strong/gusty winds will remain possible through
    the afternoon. Watch issuance is not expected.

    DISCUSSION...Multiple ongoing clusters of thunderstorms across
    southern LA/MS will continue moving slowly eastward this afternoon.
    Most of this convection is occurring to the south of surface front
    draped east-west across the Southeast. A moist low-level airmass and
    modest diurnal heating are contributing to around 1500-2000 J/kg of
    MLCAPE across the warm sector. VWP from KLIX radar shows generally
    modest south-southwesterly winds in the 0-2 km AGL, but mid-level
    winds do increase to around 30-35 kt. Similar magnitudes of
    effective bulk shear will support at least some updraft organization
    even though the stronger mid/upper-level winds will remain displaced
    to the north of the surface front. Given a mainly multicell mode
    observed so far, isolated instances of 40-60 mph winds producing
    occasional tree damage should be the primary threat. Limited
    hodograph curvature in the low levels owing to weak/veered winds
    will probably limit a meaningful tornado threat, although some weak
    low-level rotation has been noted recently with a couple cells
    embedded within a larger cluster to the north of Lake Pontchartrain
    in southeastern LA. Regardless, the lack of stronger shear will
    likely limit the overall severe threat, and watch issuance is not
    expected.

    ..Gleason/Thompson.. 11/07/2018

    ...Please see www.spc.noaa.gov for graphic product...

    ATTN...WFO...MOB...JAN...LIX...LCH...

    LAT...LON 29679259 29939246 30339211 30769173 30669098 30669057
    31038990 31318969 31318847 30178837 29598891 29238958
    29069021 29039090 29309139 29389183 29479258 29679259



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