National Weather Service United States Department of Commerce

Severe Thunderstorms for Mid-Atlantic and Northeast; Typhoon Approaching Guam

A cold front will sweep eastward today accompanied by strong to severe thunderstorms for the mid-Atlantic and Northeast today. In the wake of this cold front, autumn like temperatures and gusty winds from the Plains, Mississippi Valley, Great Lakes to most of the eastern seaboard. Fire weather conditions for lower Mississippi Valley into portions of California. For Guam, a typhoon is approaching. 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


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FTUS46 KSEW 160919 AAA
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KSEA 160919Z 1609/1712 VRB03KT P6SM SCT250
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FM162100 21005KT P6SM SCT050 OVC250
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FTUS46 KSEW 160520
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KBFI 160520Z 1606/1706 VRB03KT P6SM SCT250
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FM161500 16003KT P6SM VCFG BKN250
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FTUS46 KSEW 160520
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KPAE 160520Z 1606/1706 VRB03KT P6SM SCT250
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FM162200 20006KT P6SM SCT050 BKN250
FM170300 16004KT P6SM BKN050=