Mesoscale Discussion 0703
NWS Storm Prediction Center Norman OK
1244 PM CDT Sun May 24 2020
Areas affected...Portions of northern South Carolina...western North
Carolina...west-southwest Virginia...far southeast West Virginia
Concerning...Severe potential...Watch unlikely
Valid 241744Z - 241945Z
Probability of Watch Issuance...5 percent
SUMMARY...A couple damaging gusts may accompany some of the
strongest storms, particularly where clustering may occur. Given the
overall localized, brief nature of the damaging gust threat, a WW
issuance is not currently anticipated.
DISCUSSION...With continued strong diurnal heating of a moist
airmass, convection continues to increase in coverage and intensity
along the lee of the Applachians. Given surface high pressure
present across the Mid-Atlantic, low-level trajectories indicates
weak upslope flow, further contributing to convective coverage. The
heated, moist low-level airmass is contributing to over 1000 J/kg
MLCAPE. However, mid-level lapse rates are rather poor (around 5.5
C/km), with overall weak tropospheric flow and subsequent shear in
place, based on RAP forecast soundings. As such, a couple damaging
gusts associated with water-loaded downdrafts are the most likely
concern.
Current mosaic radar indicates particularly higher concentrations of
cells across far western NC and the WV/VA border areas. Should these
areas experience any convective cell mergers, a greater chance for a
damaging gust or two will exist. Nonetheless, the overall severe
coverage is expected to remain sparse enough to preclude a WW
issuance.
..Squitieri/Hart.. 05/24/2020
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...AKQ...LWX...RAH...RNK...RLX...CAE...GSP...MRX...
LAT...LON 34988314 35968244 37168139 38088069 38408026 38447954
38217904 37567868 36397854 35547928 34897987 34478096
34988314
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