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Mesoscale Discussion 0614
NWS Storm Prediction Center Norman OK
0338 PM CDT Sat May 16 2020
Areas affected...Portions of far east-central MO...southern/central
IL...far southwestern IN...and western KY
Concerning...Severe potential...Watch unlikely
Valid 162038Z - 162315Z
Probability of Watch Issuance...5 percent
SUMMARY...Storms capable of producing mainly isolated strong/gusty
winds will continue this afternoon. Watch issuance is not expected.
DISCUSSION...Scattered to numerous thunderstorms have developed
along/south of a weak front across parts of far east-central MO,
southern/central IL, far southwestern IN, and western KY. This
convection is occurring with nebulous large-scale forcing for ascent
and in the presence of weak mid-level winds. This is limiting
deep-layer shear per area VWPs, with pulse-type and cluster storm
modes expected to dominate through the remainder of the afternoon.
Still, sufficient instability (500-1000 J/kg MLCAPE) and a
moderately well-mixed boundary layer should support some threat for
strong/gusty downdraft winds as cores collapse. This wind threat is
expected to remain quite isolated. Marginally severe hail also
cannot be completely ruled out with semi-discrete storms mainly in
southern/central IL where instability is somewhat stronger.
Regardless, this overall environment appears only marginally
supportive of isolated strong to severe storms for the next few
hours before weakening occurs with the loss of daytime heating, and
a watch is not anticipated.
..Gleason/Dial.. 05/16/2020
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...IND...PAH...ILX...LSX...
LAT...LON 38819057 39219065 39759036 40128986 39978922 39118802
38458732 37828710 37608721 37448736 37568802 37718918
37948972 38819057
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