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Mesoscale Discussion 922
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MD 922 graphic

   Mesoscale Discussion 0922
   NWS Storm Prediction Center Norman OK
   0448 PM CDT Tue May 30 2017

   Areas affected...portions of the OR/WA Columbia Basin

   Concerning...Severe potential...Watch unlikely 

   Valid 302148Z - 310015Z

   Probability of Watch Issuance...20 percent

   SUMMARY...Isolated small to marginally severe hail and severe gusts
   are possible late this afternoon (south) through the late evening
   (north).

   DISCUSSION...Visible satellite imagery shows a cumulus field across
   central OR to the east of a northeast migrating mid-level shortwave
   trough forecast to move into central WA tonight.  Lightning data and
   radar mosaic show isolated storms have developed across
   north-central OR within a warm/well-mixed boundary layer (40 degrees
   F temperature-dewpoint spreads).  Very steep low- to mid-level lapse
   rates will favor strong evaporative cooling potential for a couple
   of the stronger thunderstorm cores.  Strengthening mid-level winds
   will act to organize cold pools and a skeletal band of storms may
   develop by early evening.  If a linear cold pool develops, it is
   possible scattered strong to severe gusts may occur on the leading
   edge of outflow.  Short-term trends will be monitored.

   ..Smith/Guyer.. 05/30/2017

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

   ATTN...WFO...OTX...PDT...

   LAT...LON   44942131 46512135 47182082 47261970 46901907 45031899
               44421972 44472070 44942131 

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