National Weather Service United States Department of Commerce

Widespread Damaging Winds Likely in the Northern Plains; Heat Continues in the Central and Southeast U.S.

Severe thunderstorms, heavy rainfall, and flooding are possible from the northern Rockies into the Upper Midwest. A derecho is likely across portions of the northern Plains, with several gusts expected to exceed 75 mph. Extreme heat is expected to intensify across much of the Southeast and Tennessee Valley, continuing through much of this 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.





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


702
FTUS46 KSEW 291720
TAFSEA
TAF
KSEA 291720Z 2918/3024 02006KT P6SM SKC
FM300300 34009KT P6SM SKC
FM300900 36005KT P6SM FEW250
FM302100 34009KT P6SM FEW250=
 
 

798
FTUS46 KSEW 291720
TAFBFI
TAF
KBFI 291720Z 2918/3018 01005KT P6SM SKC
FM300300 31008KT P6SM SKC
FM300900 00000KT P6SM FEW250
FM301700 32006KT P6SM FEW250=
 
 
   

942
FTUS46 KSEW 291720
TAFPAE
TAF
KPAE 291720Z 2918/3018 01006KT P6SM SKC
FM300100 34007KT P6SM SKC
FM301000 01003KT P6SM FEW250
FM301700 34007KT P6SM FEW250=