National Weather Service United States Department of Commerce

Hawaii and Guam Concerns; Record Warmth Spreads Eastward; Heavy Snow for Sierra-Nevada; Severe Weather for the Plains

A very active spring pattern with tropical concerns across the Pacific. Heavy rainfall will continue to impact Hawaii this weekend. Meanwhile we continue to monitor a developing typhoon that may affect Guam into early next week. For the Lower 48, heavy snow for mountains of California this weekend, increase threat for severe thunderstorms next week for the Plains and record warmth spreads east. 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


048
FTUS46 KSEW 121607 AAC
TAFSEA
TAF AMD
KSEA 121607Z 1216/1318 03007KT P6SM OVC007
FM121700 36006KT P6SM OVC010
FM121900 26006KT P6SM SCT010 OVC045
FM130600 22008KT 4SM BR BKN009
FM131000 20012KT P6SM OVC020=
 
 

049
FTUS46 KSEW 121607 AAB
TAFBFI
TAF AMD
KBFI 121607Z 1216/1312 00000KT P6SM OVC008
FM121700 36003KT P6SM OVC020
FM121900 29005KT P6SM SCT020 OVC045
FM130500 19004KT P6SM OVC030=
 
 
   

834
FTUS46 KSEW 121442 AAA
TAFPAE
TAF AMD
KPAE 121442Z 1215/1312 35004KT P6SM OVC002
FM122000 31005KT P6SM OVC025
FM130000 35005KT P6SM OVC050=