Light Rain and Snow Expected for Parts of Eastern Oregon and Idaho

Bryan Dijkhuizen

From now through Saturday night, there will be an adding Pacific trough that will still bring a possibility of light rain and snow to eastern Oregon this evening, with most of the precipitation falling in the mountains.

It is anticipated to fall less than a half-inch fresh snow. Towards evening, the trough will be too feeble to produce much more than a few flurries in the southern Sawtooths.

By morning, the trough will have moved southeastward and low clouds and patchy fog will be forming in the valleys, particularly in the Lower Treasure Valley and the Treasure Valley.

As high pressure builds in the atmosphere on Friday, the inversion in the valleys will become more intense. With high temperatures similar to today, Friday should be generally sunny after a morning of low clouds and fog in the valleys.

The Lower Treasure Valley, however, may be cooler than the rest of the state because the skies may not clear until the afternoon.
Radar Image of Western United StatesNWS Radar/Government Site

Forecast for the Weekend

Low clouds and more widespread fog will blanket the valleys on Friday night, with the exception of areas where east winds of 10 mph or stronger blow, such as the area around Jerome, Idaho.


Saturday's weather will be similar to Friday's, with pockets of fog and low clouds, which will likely continue throughout the day in the Lower Treasure Valley but will dissipate in most other locations.


Weekend hours are Sunday through Thursday. An upper ridge will remain in place for a lengthy period of time, allowing for dry and quiet conditions to prevail.

Forecast for the Rest of the Week

Surface inversions will continue to exist in valley sites, resulting in temperatures that are below normal, while temperatures at higher altitudes will be somewhat warmer than average.

Through the rest of the week, ensembles are leaning toward a ridging pattern, but the position and length of the pattern are still up in the air.

Monday and Tuesday

Because of moisture near the perimeter of the ridge, a modest possibility of snow showers will continue to exist over the central mountains through Monday and into Tuesday and beyond.

Model soundings indicate that low-level moisture is abundant over valley regions as well, which may contribute to the production of valley fog and low stratus if the inversion persists for an extended period of time.

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