National Weather Service United States Department of Commerce

Tracking Late Season Winter Storms; Unusual Early-Season Heat Wave in the Southwest

Heavy snow and high winds continue in the Great Lakes and Northeast. A moderate atmospheric river will continue to bring heavy precipitation to the Pacific Northwest and northern Rockies. A major winter storm will develop across the northern High Plains tonight into Saturday and rapidly strengthen as it moves into the Great Lakes on Sunday. Above-average temperatures expected in the Southwest. 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


475
FTUS46 KSEW 131816 AAA
TAFSEA
TAF AMD
KSEA 131816Z 1318/1424 VRB04KT 1SM -SN BR BKN004 OVC015
FM132100 14003KT 3SM -RASN BR SCT007 BKN015 OVC025
FM132300 19003KT 5SM -RA BR SCT010 BKN015 OVC025
FM140500 VRB03KT 6SM BR VCSH BKN007 OVC015
FM140800 VRB04KT 1SM -SHRA BKN005 OVC015
FM141400 21007KT P6SM VCSH OVC020
FM141700 20010KT P6SM BKN050=
 
 

832
FTUS46 KSEW 131818 AAA
TAFBFI
TAF AMD
KBFI 131818Z 1318/1418 00000KT 1SM -SN BR BKN007 OVC020
FM132100 VRB03KT 3SM -RASN BR SCT007 BKN015 OVC025
FM132300 VRB03KT P6SM -RA SCT012 BKN018 OVC025
FM140500 VRB03KT 6SM BR VCSH BKN012 OVC018
FM140800 VRB04KT 3SM -SHRA BKN008 OVC018
FM141400 21007KT P6SM VCSH OVC020=
 
 
   

502
FTUS46 KSEW 131724
TAFPAE
TAF
KPAE 131724Z 1318/1418 00000KT 2SM -SN BR OVC003
FM132200 VRB05KT 5SM BR VCSH OVC010
FM141100 28005KT 6SM BR VCSH OVC003
FM141500 25005KT P6SM SCT020 BKN050=