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Mesoscale Discussion 1816
NWS Storm Prediction Center Norman OK
0439 AM CST Thu Nov 26 2020
Areas affected...Southeast Alabama/far western Georgia
Concerning...Severe potential...Watch unlikely
Valid 261039Z - 261215Z
Probability of Watch Issuance...5 percent
SUMMARY...Strong storms with a localized severe risk may persist
through the early morning hours across parts of southeast Alabama
into far western Georgia. Localized wind damage and/or a brief
tornado cannot be ruled out.
DISCUSSION...Convection has persisted much of the overnight with a
modest increase in intensity (evidenced by lightning
flashes/radar-derived updraft intensity) of storms within a
northeast/southwest-oriented corridor across southeast Alabama into
west-central/north-central Georgia near/ahead of an
east-southeastward advancing cold front. The strongest convection
has generally paralleled I-85 in Alabama over the past couple of
hours, where supercell characteristics have been observed including
weak/transient rotation.
Surface temperatures and dewpoints have tended to rise overnight,
which is minimizing boundary layer inhibition. Latest Maxwell/MXX
WSR-88D VWP data still indicates upwards of 40 kt of 0-6 km bulk
shear, which will remain supportive of some supercell structures in
conjunction with MLCAPE estimated to be on the order of 600-1000
J/kg. Low-level shear will tend to gradually weaken through/beyond
sunrise as winds in the lowest 1-2 km AGL continue to veer
southwesterly and weaken. While the severe storm risk is expected to
remain low, localized wind damage and/or a brief tornado cannot be
entirely ruled out over the next few hours.
..Guyer.. 11/26/2020
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...FFC...TAE...BMX...
LAT...LON 31948617 32408600 33378453 32958396 32468391 32238397
31878444 31578525 31678596 31948617
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