Statement as of 1:49 PM PST on November 29, 2013 Areal Flood Watch ... Flood Watch in effect from Sunday afternoon through Monday afternoon... The National Weather Service in Seattle has issued a * Flood Watch for a portion of western Washington... including the following counties... Snohomish... King... Pierce... Thurston... Lewis and... Mason. * From Sunday afternoon through Monday afternoon * moisture streaming east across the Pacific ahead of a strong front moving into the area will give around 3 inches of rain to the Olympics and north Cascades... and 4 to 8 inches of rain to the central Cascades late Saturday night through Sunday night. The heavy rainfall will produce sharp rises on area rivers Sunday and Sunday night... especially rivers flowing off the central Cascades. Minor to moderate flooding is possible on some rivers in the watch area. Precautionary/preparedness actions... A Flood Watch means conditions are favorable for flooding but flooding is not imminent or occurring. Monitor the latest forecasts from the National Weather Service and be ready to act quickly if flooding is observed or a warning is issued. Statement as of 11:01 am PST on November 29, 2013 Special Statement ... The threat for heavy snowfall in the Cascade passes through Sunday night has diminished... ... Heavy rainfall will still make travel through the passes difficult Sunday and Sunday night... ... A change to much colder weather is expected throughout western Washington next week... A strong cold front is now expected to move southward through the area on Monday. This is about 12-24 hours slower than what had been expected over the past several days. This slower movement means that there is a much diminished threat for heavy snowfall in the Cascade passes Sunday afternoon and Sunday night. It now appears that there is a moderate to high threat of heavy rainfall in the passes beginning late Saturday night and continuing through Sunday night. Snow levels are now expected to remain above 4000 feet during this period. However... Saturday still looks like the best travel day across the passes as heavy rainfall will result in water ponding on the roadways and will reduce visibilities. A strong cold front will southward from the interior of Canada on Monday. At this time it appears that the front will move into the north interior midday Monday and through the rest of western Washington Monday afternoon or evening. Windy Fraser outflow will likely affect the Bellingham area and the San Juan Islands on Monday and will continue through Tuesday. A few snow showers may accompany the front as it moves south across the area... but at this time it appears that lowland snowfall accumulations... if they occur... will be spotty. Regarding the possibility of lowland snow Monday afternoon or Monday night... it is important to note that there is a great deal of uncertainty with a 3 to 4-day weather forecast. Check back through this weekend for the latest forecasts. Cold temperatures are expected Monday night through next Thursday... with temperatures running 10 to 20 degrees below normal for this time of year. Over The Lowlands... lows in the teens to mid 20s will be common... with highs in the lower to mid 30s. Albrecht 341 am PST Fri Nov 29 2013 ... Heavy snowfall is expected in the Major Mountain passes from late Sunday afternoon into early Monday morning... ... A change to much colder weather is expected throughout western Washington next week... A strong cold front will push through western Washington on Sunday afternoon. A few hours of heavy rain will precede the front on Sunday morning... with snow levels near 6000 feet. Once the front passes... snow levels will crash down late Sunday afternoon and evening... falling to near 2000 feet by late Sunday night. At Stevens... Snoqualmie and white passes... rain will change to snow and become heavy at times during the late afternoon and evening. Travel through the passes will become challenging due to snow and wind. If you are trying to choose between traveling across the Cascades on Saturday or on Sunday... Saturday will be the more favorable weather day for travelers. If you must travel on Sunday... you may beat the wintry conditions by traveling in the morning... but heavy rain will greet you instead on the trip through the mountains. The strong cold front will also bring windy conditions for The Lowlands... with peak wind gusts around 40-50 mph expected on Sunday. Late Monday... windy Fraser outflow will start to affect the Bellingham area and the San Juan Islands... bringing a colder and drier air mass into western Washington straight from the interior of Canada. As the leading edge of the air mass slips south through the Puget Sound lowlands on Monday evening... a few snow showers may take place with spotty accumulations possible. At this time... it looks like many lowland locations will escape with little or no accumulating snow. Regarding the possibility of lowland snow on Monday... it is important to note that there is a great deal of uncertainty with a 4-day weather forecast... so check back through this weekend for the latest forecasts... along with any possible watches or warnings. Cold temperatures are expected Monday night through next Thursday... with temperatures running from 10 to 20 degrees below normal for this time of year. Over The Lowlands... lows in the upper teens to mid 20s will be common... with highs in the lower to mid 30s.
Posted on: Fri, 29 Nov 2013 21:51:52 +0000
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