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ACUS11 KWNS 190240
SWOMCD
SPC MCD 190240
OKZ000-TXZ000-190345-

Mesoscale Discussion 0457
NWS Storm Prediction Center Norman OK
0940 PM CDT Fri May 18 2018

Areas affected...Far eastern TX Panhandle...eastern OK Panhandle and western/northern OK

Concerning...Severe Thunderstorm Watch 104...

Valid 190240Z - 190345Z

The severe weather threat for Severe Thunderstorm Watch 104
continues.

SUMMARY...Local WFO extension in time and area may be needed for WW
104 for part of OK for an isolated threat for hail and/or damaging
wind gusts.

DISCUSSION...At 0230Z, mosaic radar imagery indicated a
strong-severe storm in southwest OK and additional strong to severe
storms moving to the east-northeast through extreme northwest to
north-central OK. The onset of boundary-layer cooling, given the
loss of daytime heating has strengthened surface-based inhibition
per modification of 00Z OUN sounding. This factor should limit the
likelihood for more widespread storms, though residual moderate
elevated instability and steep midlevel lapse rates suggest isolated
severe hail will remain possible in the short term across southwest
OK. Farther north, the southern extent of a band of intense storms
moving through central KS extended into northern Woods and northwest
Alfalfa Counties OK. Locally strong damaging winds and/or hail will
remain a threat, with this portion of the line possibly posing a
severe risk to Grant County in the short term. A strengthening cap
should limit the southward extension of the KS storms.

..Peters.. 05/19/2018

...Please see www.spc.noaa.gov for graphic product...

ATTN...WFO...OUN...AMA...

LAT...LON 34609994 36510001 36920037 36959812 36279817 35509858
34299859 34139879 34169966 34239995 34609994



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