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Mesoscale Discussion 769
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   Mesoscale Discussion 0769
   NWS Storm Prediction Center Norman OK
   0719 PM CDT Thu May 18 2017

   Areas affected...northwest and north-central OK

   Concerning...Tornado Watch 235...

   Valid 190019Z - 190045Z

   The severe weather threat for Tornado Watch 235 continues.

   SUMMARY...Large hail and severe gusts will become the main threats
   with storms over northern OK this evening.

   DISCUSSION...Radar mosaic shows several strong/severe thunderstorms
   across northwestern OK and farther east near I-35 in north-central
   OK.  OK mesonet surface observations show considerable cooling of
   the boundary layer has occurred due to widespread convection. 
   Surface temperatures are near 70 degrees F and dewpoints in the
   lower to middle 60s.  As a result, moderate buoyancy still resides
   across the discussion area despite lessening boundary layer
   instability.  While a tornado is possible over the next 30 minutes,
   it appears the primary severe hazards will continue to transition to
   hail (possibly wind-driven) and severe gusts with the stronger
   storms.

   ..Smith.. 05/19/2017

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

   ATTN...WFO...ICT...OUN...DDC...

   LAT...LON   36189757 36089960 37069862 36909735 36389728 36189757 

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Page last modified: May 19, 2017
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