Frigid cold tightens its icy grip across Wash. state

Temperatures plunged into the teens and 20s across Western Washington overnight as entrenched frigid air tightened its grip on the region. By late Thursday morning, some snow flurries were falling across the northern Olympic Peninsula.Overnight lows in selected cities: 14 at Bremerton, 14 at Shelton, 16 at Olympia, 16 at Joint Base Lewis-McChord, 18 at Centralia, 21 at Bellingham, 22 at Hoquiam, 25 at Everett, 25 at SeaTac, and 27 at Mount Vernon.Across the Cascades in Eastern Washington, the mercury plunged even lower. It hit minus-2 at Pullman, 10 at Spokane, 10 at Ellensburg, 5 at Moses Lake, and 4 in the Tri-Cities.As the day progressed, mid- to high-level clouds moved over Western Washington, bringing a few snow flurries to Quillayute, Port Angeles and other locations along the northern reaches of the Olympic Peninsula. The light snowfall is expected to remain west of Puget Sound.Thursday's highs should max out in the 30s.Another shot of cold air will move down over the area from British Columbia Thursday night and early Friday, with the cold and dry air mass maintaining its grip over the region through the weekend.The National Weather Service says Seattle has the potential to have three consecutive mornings - Saturday, Sunday and Monday - with a low temperature below 20 degrees. The last time there was a stretch of at least three days in a row with lows less than 20 degrees in Seattle was in 1998 with four days in a row - Dec. 19 through 22. Temperatures may begin to moderate across the region next Tuesday and Wednesday as the low-level flow prevailing winds flip back to onshore, bringing a chance of rain.