by: KIRO 7 Chief Meteorologist Morgan Palmer Updated:
Locations that still have piles of snow around storm drains could see flooding as more than an inch of rain will fall through Thursday. Other locations nearer the Cascades and across Whatcom County will remain icy and snowpacked, despite the rain.
A warm plume of moisture from the Pacific will bring heavy rain to the region through Thursday afternoon. Initially, the precipitation has been falling as snow and freezing rain around Whatcom and Skagit counties, the San Juans and parts of the Olympic Peninsula. Eventually, the atmosphere will warm enough to turn all that to rain, but especially in Whatcom County, this will take until Thursday morning.
Across many locations that received more than a half-foot of snow, expect areas of urban flooding because of rainwater that is blocked from running off into the storm drains. This problem will only slowly get better through Thursday.
Rivers will also be on the rise, but the relatively short duration of the heavy rain in the mountains will likely keep river flooding from getting above minor flood stages. However, they will be running fast and the rises will be rapid.
At time of high tide, there will also be some coastal flooding and tidal overwash Thursday, not only around Puget Sound and the rest of the Salish Sea, but along the Pacific coast as well.
Thursday will also be breezy, especially at the coast. Highs will be in the 40s and 50s.
Looking up for the weekend
We'll finally get a chance to dry out this weekend with temperatures close to where they ought to be for this time of year.
There is indication that warmer weather will continue but KIRO 7 meteorologists will continue to be on the lookout for any weather patterns that could turn the region much colder again. It is a possibility as we're only in early February.
© 2017 Cox Media Group.
Areas of flooding possible Thursday
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