FastCast—Wednesday, Dec. 1 to Sunday, Dec. 6:
After weeks of active weather, December will start calm and much colder than November has been. Rain associated with the final atmospheric river will continue in Whatcom County and the NW Olympic Peninsula through early Thursday. Additional river flooding is possible, mainly in minor flood stage. Temperatures will remain warm, in the mid-upper 50s, through Wednesday, but will not climb above 50 degrees after that. Expect much cooler highs in the low to mid 40s through Sunday, with lows in the mid to upper 30s. Showers are possible at times, mainly from Friday to Sunday, with totals of 0.25-0.4 inches. Since it will be much cooler, snow levels will be lower. Expect snow at the passes, around 6 inches through Sunday.
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What a month! It has been very wet and active, to say the least. Rain totals have ranged from 8-14 inches in the lowlands to 18-25 inches on the coast and in the NW Interior. Plentiful atmospheric rivers have caused multiple rounds of flooding, including devastating flooding in Whatcom County and BC’s Lower Mainland earlier in November.
The last atmospheric river is moving through at a northwesterly angle, keeping the metro area in the rain shadow. See the 24 hour rain totals ending 6 PM Tuesday. Notice the areas where totals are higher, and where they are lower (downstream of the Olympics).
The contrasts between sides of the Olympics are impressive. The most rain (1.5-2.5 inches) fell in Whatcom County, along the Coast/Olympics, and in the Cascades. This rain will taper by Thursday morning, and rivers will recede soon after.
By Thursday, temperatures don’t go above 50 degrees. Expect highs (after Wednesday) in the low to mid 40s, with lows in the mid to upper 30s. Showers are also possible, mainly from Friday to Sunday, totaling around 0.25-0.5 inches.
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