Mesoscale Discussion 1522
   NWS Storm Prediction Center Norman OK
   1000 PM CDT Mon Aug 17 2020

   Areas affected...North central Oregon and south central Washington.

   Concerning...Severe Thunderstorm Watch 446...

   Valid 180300Z - 180430Z

   The severe weather threat for Severe Thunderstorm Watch 446
   continues.

   SUMMARY...An isolated damaging-wind threat continues for the next 1
   to 2 hours in northwest portions of watch 446.

   DISCUSSION...Overall storm activity has struggled within severe
   thunderstorm watch 446, but the strongest storms have been in
   western portions of the watch. This corresponds to a plume of
   mid-level moisture which can be observed on water vapor imagery and
   was observed on the 00Z MFR and OTX RAOB. This increase in mid-level
   moisture has increased elevated instability in this region (~1500
   MUCAPE per SPC mesoanalysis). Therefore, while the severe weather
   threat is likely waning, a few strong to severe storms remain
   possible for the next few hours, especially where the elevated
   instability is greatest.

   ..Bentley.. 08/18/2020

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

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

   LAT...LON   45492028 46011994 46371922 46501839 46311792 45831808
               45471875 45291952 45341999 45492028