SPC MD 1522

MD 1522 CONCERNING SEVERE THUNDERSTORM WATCH 446... FOR NORTH CENTRAL OREGON AND SOUTH CENTRAL WASHINGTON.

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 

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from SPC Forecast Products http://www.spc.noaa.gov/products/md/md1522.html