Frost/Freeze in North Central Oregon, Oregon

The mesonet station FW0649 Dufur recorded temperatures at or below 32 degrees for approximately 14 hours ending 1001 PDT. The Oregon DOT station ODT41 at Wasco recorded temperatures at or below 32 degrees for approximately 12 hours ending 0916 PDT. The mesonet station FW9671 Maupin recorded temperatures at or below 32 degrees for approximately 13 hours ending 1045 PDT. Most stations across the zone reported morning lows less than 28 degrees.

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 much 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.