In case you haven't noticed, we're having a rare freezing rain/sleet storm everywhere south of Everett. It's caused by a temperature inversion near the surface, where warm air pushes up above a sub-freezing air mass. Some of this rain is freezing on the way down into ice pellets (sleet), but a lot of it is staying liquid and hitting the ground as freezing rain (freezes on contact with the cold surface).
Today there will be a wintry potpourri: freezing rain, sleet, snow, and rain, until the air warms up enough to turn it all into rain.
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