|Mesoscale Discussion 770|
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Mesoscale Discussion 0770
NWS Storm Prediction Center Norman OK
0743 PM CDT Thu May 18 2017
Areas affected...south-central OK
Concerning...Tornado Watch 235...240...
Valid 190043Z - 190145Z
The severe weather threat for Tornado Watch 235, 240 continues.
SUMMARY...Scattered severe gusts 60-80 mph are possible with a
bowing MCS across south-central OK.
DISCUSSION...Radar imagery shows a developing MCS across the Red
River Valley in between the I-44 and I-35 corridors. The transition
to a linear mode will likely result in mainly a wind risk as it
progresses eastward across south-central OK this evening. Surface
observations ahead of the storm complex show temperatures in the
lower 80s degrees F and dewpoints around 70 F. The 00Z FWD raob
showed steep 0-2 km lapse rates and 4100 J/kg SBCAPE with a veering
and strengthening wind profile with height. A strong moist influx
and 40-kt south-southeasterly 925-850 mb flow at KFWS, steep 700-500
lapse rates (7.5 degrees C/km), and strong 0-6 km shear (50-kt) all
strongly favor a severe-wind producing MCS across southern OK.
Expecting scattered 60-80 mph winds with the stronger downdrafts.
...Please see www.spc.noaa.gov for graphic product...
LAT...LON 33949711 33999822 34609772 34969636 34189635 33949711
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