National Weather Service United States Department of Commerce

Heavy Rain and Thunderstorms in the Plains; Snow in the Northern Rockies

A storm system moving eastward will bring widespread showers and thunderstorms over parts of the Northern Plains to the Southern Plains and Upper Great Lakes through Friday. Heavy snow will continue over parts of the Northern Rockies. 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


274
FTUS46 KSEW 160520
TAFSEA
TAF
KSEA 160520Z 1606/1712 15004KT P6SM SCT250
FM161400 17004KT P6SM FEW030
FM161700 21007KT P6SM SCT070 BKN150
FM170400 20009G16KT P6SM OVC035
PROB30 1706/1712 -SHRA OVC027=
 
 

279
FTUS46 KSEW 160520
TAFBFI
TAF
KBFI 160520Z 1606/1706 VRB02KT P6SM SCT250
FM161400 17004KT P6SM FEW030
FM161700 19006KT P6SM SCT070 BKN150
FM170400 20008G15KT P6SM OVC035=
 
 
   

286
FTUS46 KSEW 160520
TAFPAE
TAF
KPAE 160520Z 1606/1706 15004KT P6SM SCT150
FM161400 18005KT P6SM VCFG FEW004
FM161800 20006KT P6SM BKN150
FM170400 18008G15KT P6SM OVC035
PROB30 1704/1706 -SHRA OVC027=