...Unseasonably cold and wet storm for the holiday weekend...
Another late spring storm is developing over the area. This storm is expected to last through monday morning with main impacts being unseasonably cold...wet and sometimes snowy conditions.
Daytime temperatures for Saturday and Sunday will be in the 40s in the mountains and 50s in the valleys and highlands. Overnight lows will drop to the 20s and 30s in the mountains and mid 30s to mid 40s in the valleys and highlands. High temperatures will average 15 to 20 degrees below normal for these dates.
Moderate to heavy rain and snow is forecast with this storm. The heaviest precipitation will begin over southern areas of the region then work north into the central mountains tonight and Sunday. Wrap around moisture from the large low center will combine with falling snow levels to produce wet snow accumulations over the highlands of Oregon and Idaho tonight and Sunday. 2 to 4 inches is possible in these areas with significant snowfall in the mountains. Rainfall totals could also be heavy with up to one inch of rain in parts of southern Idaho and southeast Oregon. Around a half inch of rain is expected in the populated Snake River valley by the time the storm ends.
In addition to the wet conditions...blustery west to northwest winds will develop on Sunday as the storm slowly departs. Speeds of 15 to 30 mph with gusts up to 40 mph are likely from Boise and mountain home westward through Oregon.
Slightly warmer and drier conditions will develop on Memorial Day especially by afternoon. A more significant warm up is forecast for mid-week with temperatures returning to normal or even slightly above normal.
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