AgWeatherNet Frost Warning for May 11, 2012

Sub-Freezing Temperatures Likely on Friday Morning

Nic Loyd, Meteorologist, 509-786-9357
Gerrit Hoogenboom, Director, 509-786-9371

Frost Risk Summary
  • Friday Morning: Lows in the mid to upper 20s in cold areas, and 30s to low 40s in most other areas.

Frost is likely across parts of Washington on Friday morning. Although uncertainty still exists regarding the exact temperatures, it appears that the coldest areas will drop into the mid to upper 20s, while many areas will be in the 30s to low 40s. With generally clear skies, low dew point temperatures, and increasing stability, certain calm areas may be quite cold tonight, despite warming conditions higher in the atmosphere.

The most likely danger areas in central Washington will be the Yakima Valley, Okanogan region (excluding the Oroville/Canadian Border area), and parts of the Basin. On frost nights, Moxee tends to be the coldest AgWeatherNet location with significant agricultural interests. It is possible that some locations will be helped out by a light north breeze later in the night, in connection with weak high pressure in southern British Columbia. The frost risk is less in the Wenatchee region, the Mattawa/Wahluke Slope region, and areas near water or the urban heat islands of cities.

Eastern Washington will be cold, with subfreezing overnight temperatures likely in the Pullman and Spokane areas. Rural areas of western Washington that are away from water, such as the typically cold regions outside of Olympia, may drop to 30 to 32 degrees tonight. However, most of western Washington will be above freezing.

There is a slight chance of frost on Saturday morning in the very coldest locations, although it generally appears safe for most areas. Temperatures will warm rapidly this weekend, with highs climbing to around 90 in south central Washington by Monday.

Washington State University