National Weather Service United States Department of Commerce

Severe Thunderstorms in the Midwest; Mountain Snow in the Northern Rockies

Scattered thunderstorms capable of producing damaging winds, large hail, and a few tornadoes are expected to develop across parts of the Ohio Valley and Lower Great Lakes this afternoon. Pockets of heavy mountain snow will develop over the Northern Rockies Wednesday evening into Thursday morning. Read More >

A Puget Sound Convergence Zone (PSCZ) forms when strong westerly winds flow around the Olympic Peninsula and converge over Puget Sound. It generally forms north of Seattle, and may move southward to as far as Boeing Field or SeaTac Airport. A PSCZ can cause a narrow band of convective precipitation along it, which can include rain showers, thunderstorms, or snowfall. Strong south to southwest winds are to the south of the PSCZ and north to northwest winds to the north.





 
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Wind Barbs, PIREPs, Radar, 10nm Range Rings, all sites except CWOP


000
FTUS46 KSEW 172320
TAFSEA
TAF
KSEA 172320Z 1800/1906 33012G18KT P6SM SCT250
FM180600 03008KT P6SM SKC
FM181800 01014G20KT P6SM SKC=
 
 

000
FTUS46 KSEW 172320
TAFBFI
TAF
KBFI 172320Z 1800/1824 32010G18KT P6SM SCT250
FM180600 00000KT P6SM SKC
FM181800 33013G21KT P6SM SKC=
 
 
   

000
FTUS46 KSEW 172320
TAFPAE
TAF
KPAE 172320Z 1800/1824 33010G18KT P6SM SKC
FM180600 34004KT P6SM SKC
FM181800 35010G18KT P6SM SKC=