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Mesoscale Discussion 1175
NWS Storm Prediction Center Norman OK
0314 PM CDT Fri Jul 10 2020
Areas affected...western Nebraska and far northeastern Colorado
Concerning...Severe potential...Watch possible
Valid 102014Z - 102215Z
Probability of Watch Issuance...40 percent
SUMMARY...A conditional threat for isolated thunderstorm development
will exist this afternoon and early evening. If a WW is needed, the
most likely location for issuance is in western Nebraska.
DISCUSSION...Strong insolation has allowed for surface temperatures
to increase into the upper 90s to 100 F across the discussion area
recently beneath very steep mid-level lapse rates. Point forecast
soundings indicate that inhibition has been nearly completely
removed especially along/near a dryline subjectively analyzed from
near GCC to BFF to AKO. A few areas of towering cumulus have also
been noted via visible satellite imagery especially near the
dryline. Strong ridging/height rises have been noted across much of
the region, though the glancing influence of a mid-level trough over
central Montana/northern Wyoming may support isolated convective
development over time. This risk is a bit uncertain, however.
Should storms form, very steep low- and mid-level lapse rates and
appreciable deep shear (>40 knots) will promote damaging wind and
hail potential. Any linear organization/upscale growth may even
promote enough of a spatial/temporal threat to necessitate a WW
issuance, although that scenario isn't particularly clear.
Convective trends will continue to be monitored.
..Cook/Kerr.. 07/10/2020
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...LBF...GLD...BOU...CYS...
LAT...LON 42990290 42660328 42040317 41160294 40240299 39530298
39400265 39700220 40970154 41330133 42070131 42750166
42990290
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