National Weather Service United States Department of Commerce

Major Winter Storm Ongoing in the Upper Midwest; Severe Weather Tonight from the Mid-South to the Ohio Valley

A major winter storm will continue to bring blizzard conditions, heavy snowfall, icing, and strong winds through Monday across the Upper Midwest and Upper Great Lakes. A line of storms will be capable of producing widespread damaging winds, tornadoes, and some large hail from the Mid-South to the Ohio Valley and the Southeast through tonight, moving into the Mid-Atlantic Monday. 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. More model information for the winds around SeaTac can be found on the SeaTac Wind Page .





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


383
FTUS46 KSEW 220520
TAFSEA
TAF
KSEA 220520Z 2206/2312 20005KT P6SM SCT050 SCT250
FM221100 17006KT P6SM BKN040 BKN250
FM221300 17003KT P6SM BKN035 BKN250
FM221500 14004KT P6SM BKN040 BKN250
FM222000 30008KT P6SM SCT040 BKN250
FM230300 35006KT P6SM SCT050 SCT250=
 
 

361
FTUS46 KSEW 220520
TAFBFI
TAF
KBFI 220520Z 2206/2306 VRB05KT P6SM SCT050 SCT250
FM221100 15005KT P6SM BKN045 BKN250
FM221300 15004KT P6SM BKN040 BKN250
FM222000 31005KT P6SM SCT050 BKN250
FM230300 VRB03KT P6SM SCT050 SCT250=
 
 
   

365
FTUS46 KSEW 220520
TAFPAE
TAF
KPAE 220520Z 2206/2306 VRB03KT P6SM BKN050
FM221000 15006KT P6SM BKN040
FM222100 31005KT P6SM SCT045 BKN250
FM230100 34004KT P6SM SCT250=