Tomorrow is forecast to be nearly the same temperature as today.
Forecast for West Slopes Northern Cascades and Passes
Updated: 3:30 PM PST on November 11, 2009
Winter Storm Watch in effect from late Thursday night through Friday evening...
Tonight
Mostly cloudy. Showers likely south and a chance of showers north. Snow level 2000 feet. Snow accumulation up to 4 inches south. Light wind in the passes becoming east near 10 mph.
Thursday
Mostly cloudy. A chance of showers. Snow level 2500 feet. Afternoon pass temperatures in the 30s. East wind in the passes near 10 mph becoming light.
Clouding up with snow or rain developing. Snow level 2000 feet. Snow accumulation of 3 to 7 inches. East wind in the passes near 10 mph.
Friday
Showers. Snow level 1500 feet. Afternoon pass temperatures near 30. Significant additional snow accumulations possible. West wind in the passes 15 to 20 mph.
... Winter Storm Watch in effect from late Thursday night through Friday evening...
The National Weather Service in Seattle has issued a Winter Storm Watch for the Olympics and central and northern Cascades... which is in effect from late Thursday night through Friday evening.
A cold front will pass across the region during the pre-dawn hours Friday. In advance of this front... heavier snow is expected to develop shortly before midnight over the Olympics and a few hours after midnight across the Cascades then continue into the morning hours.
After the front passes... strong west to northwest flow will likely generate heavy snow showers throughout the Cascades through the day Friday and possibly into Friday evening. There is the potential for an extra boost to the snow across the central Cascades Friday evening due to convergent flow around the Olympics and Vancouver Island.
Storm total accumulations over 12 inches is possible with this system... especially in the central Cascades. The snow level will generally range from 1500 to 2500 feet which will affect all the mountain passes.
Precautionary/preparedness actions...
A Winter Storm Watch means there is a potential for significant snow accumulations that may impact travel. Continue to monitor the latest forecasts.
Cerniglia
Public Information Statement
Statement as of 8:00 PM PDT on November 11, 2009
Rainfall in Washington during the month of October was above normal for the entire state. The northern part of the state averaged around 200 percent of normal for October precipitation.
For western Washington... the percentage of normal precipitation ranged from 130 for the southwest interior to 212 for the northwest interior. The greatest amount of precipitation recorded at climate stations for the mountains and foothills... coasts... and interior lowlands was 18.84 inches at Hoh vistor center... 15.41 inches at Clearwater... and 12.38 inches at Grays River respectively.
For eastern Washington... the percentage of normal precipitation ranged from 137 for the Palouse and Blue Mountains to 205 for the Okanogan area. The greatest amount of precipitation recorded at climate stations for the mountains and foothills and The Lowlands was 3.70 inches at plain and 2.51 inches at Newport respectively.
The outlook for November and beyond... the outlook for the next two weeks is for above normal precipitation for the west side and near normal precipitaion for the east side. The outlook for November through January is for below normal precipitation for the west side and near normal precipitation for the east side.
The Table below gives precipitation figures as a percent of normal for regions of Washington. The current water year ended September 2009.
Oct water year past 3 past 12 2009 to date months months western Washington coast 150 150 122 90 Olympics 144 144 128 74 northwest interior 212 212 149 109 Puget Sound lowlands 160 160 135 97 southwest interior 130 130 110 90 west foothills Cascades 164 164 136 102 Cascades 152 152 124 99
Eastern Washington east slopes Cascades 177 177 129 96 Okanogan 205 205 99 75 Central Basin 174 174 100 93 northeast 180 180 107 95 Palouse and Blue Mountains 137 137 96 124
The Table below expresses precipitation in inches and as a percent of normal for a variety of locations around the state. Occasionally missing data at a site are estimated using observed data from surrounding stations.
Oct 2009 water year to date past 12 months inches pct inches pct inches pct