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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.

   ..Smith.. 05/19/2017

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

   ATTN...WFO...FWD...OUN...

   LAT...LON   33949711 33999822 34609772 34969636 34189635 33949711 

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Page last modified: May 19, 2017
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