|Mesoscale Discussion 783|
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Mesoscale Discussion 0783
NWS Storm Prediction Center Norman OK
0245 PM CDT Fri May 19 2017
Areas affected...Big Country of TX
Concerning...Tornado Watch 246...
Valid 191945Z - 192045Z
The severe weather threat for Tornado Watch 246 continues.
SUMMARY...Tornado threat continues across WW246.
DISCUSSION...Boundary-layer has been slow to warm across much of
north-central TX this afternoon, though strong sunshine has
contributed to significant heating across southwest TX into the TX
south plains where sfc-3km lapse rates now exceed 9 C/km. Earlier
outflow boundary that approached Tarrant County has stalled and
currently extends across Grayson-Denton-Jack Counties.
Thunderstorms have concentrated north of this boundary aided in
large part to low-level warm advection. However, isolated
supercells continue to generate south of the boundary across WW246
along the eastern edge of steeper lapse rate plume where CINH is
relatively weak. Latest visible satellite imagery suggests
additional thunderstorm activity will soon evolve as towering cu
currently extends as far south as eastern Crockett County.
...Please see www.spc.noaa.gov for graphic product...
LAT...LON 31100121 32860094 32879888 31099915 31100121
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