I’ve been busy this afternoon so a little slow getting the info, but here are my quick thoughts on freezing rain west of the Cascades.
- Wherever the east wind is blowing it’ll stay above freezing tonight, that includes the western Gorge below about 1,000′ and all of the east metro area. That means no freezing rain in these areas. The cold airmass in the Gorge is too “warm” and too moist now (almost no evaporative cooling).
- Some outlying areas in the valleys (mainly Washington and/or Clark Counties) will drop to freezing before midnight, but the increasing cloud cover should bring those spots back up to or above freezing when the precipitation arrives. As a result if there is some sort of freezing rain it would be only in an isolated spot or two.
- As a result, 95% of us won’t see any freezing precipitation in the next 24 hours.
In the Gorge, assuming more than a few hundredths of precipitation make it there, it should fall as snow since the cold layer is deep enough east of Bonneville.
Sunday looks very nice…like today, because the cool Gorge wind will keep fog & low clouds down in the central/southern valley.
Chief Meteorologist Mark Nelsen