Frost/Freeze in Eastern Columbia River Gorge, Washington

The ASOS KDLS recorded temperatures at or below 32 degrees for approximately 9 hours ending at 0945 PDT. The Mesonet station FW7259 recorded temperatures at or below 32 degrees for approximately 12 hours ending at 0941 PDT. The WA Department of Transportation station TMARY recorded temperatures at or below 32 degrees for approximately 5 hours ending at 0823 PDT.

Increasing northerly flow reinforced by a cold arctic airmass behind a shortwave trough passage starting October 26th lead to temperatures region-wide dropping well below normal. Overnight temperatures across the lower elevations in the intermountain Pacific Northwest were able to cool well below freezing across the region for much of the overnight period. This lead to all lower elevation zones experiencing their end of season freeze by the morning of October 28th.