Mesoscale Discussion 1693
   NWS Storm Prediction Center Norman OK
   0612 PM CDT Sat Aug 10 2019

   Areas affected...eastern portions of Washington and Oregon...and
   vicinity

   Concerning...Severe potential...Watch unlikely 

   Valid 102312Z - 110115Z

   Probability of Watch Issuance...20 percent

   SUMMARY...Scattered thunderstorms continue to develop across
   portions of the Pacific Northwest.  Local/limited severe risk is
   evident, though threat does not appear sufficient to warrant WW
   issuance.

   DISCUSSION...Latest radar loop shows storm coverage continuing to
   increase across central and eastern Washington/eastern Oregon, and
   into adjacent northern Idaho, on the northern and eastern side
   periphery of an upper low center now indicated over northern
   California.  Cold air aloft associated with this feature is
   combining with diurnal heating and a seasonally moist airmass to
   result in weak to moderate destabilization, with mixed-layer CAPE
   near 500 J/kg across eastern and northern Oregon, and as high as
   1000 to 1500 J/kg northward into Washington.

   Deep-layer flow remains somewhat weak across this region, with
   stronger flow to the south and east, within the height gradient
   between the low, and a large area of ridging over the central
   U.S./Rockies.  Still, with ample CAPE and enhanced large-scale
   ascent across the region, a few stronger cells will remain capable
   of producing locally gusty/damaging winds, and marginal hail. 
   Activity should begin to gradually wane in intensity after dark,
   with the onset of diurnal cooling.

   ..Goss/Hart.. 08/10/2019

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

   ATTN...WFO...MSO...BOI...OTX...PDT...SEW...PQR...

   LAT...LON   43121711 43231841 44722043 46382171 47422179 48751991
               49201632 48001606 44551657 43121711