National Weather Service United States Department of Commerce

Severe Thunderstorms and Heavy Rainfall for the Southwest; Heat Spreads Across the Center of the Nation

Moisture will continue to move into areas of the West. This will increase showers and thunderstorms coverage and intensity, with the risk of flash flooding and damaging wind gusts. Meanwhile, heat across the Southwest will expand into the center of the nation this weekend into early next week. Trends favor this heat will spread across the Ohio Valley, mid-Atlantic next week. 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


112
FTUS46 KSEW 292102 AAA
TAFSEA
TAF AMD
KSEA 292102Z 2921/3024 21008KT P6SM VCSH SCT035 BKN060
FM300000 27008KT P6SM SCT050 BKN100
FM300600 17005KT P6SM SCT025 BKN050
FM301500 21006KT P6SM BKN025 OVC035
FM301900 23005KT P6SM SCT025 OVC035=
 
 

977
FTUS46 KSEW 291720
TAFBFI
TAF
KBFI 291720Z 2918/3018 27004KT P6SM VCSH SCT020 BKN035
FM292000 19006KT P6SM VCSH BKN040
FM300000 VRB05KT P6SM SCT050 BKN100
FM300500 15003KT P6SM SCT030 BKN100
FM301100 20006KT P6SM BKN035
FM301400 16004KT P6SM OVC025=
 
 
   

987
FTUS46 KSEW 291720
TAFPAE
TAF
KPAE 291720Z 2918/3018 33004KT P6SM FEW007 BKN025
FM292000 22005KT P6SM -SHRA BKN035
FM300300 35006KT P6SM SCT050 BKN100
FM301100 16005KT P6SM BKN025 OVC035=