Time and Day:
0700 Friday
The Snapshot: Increasing clouds today with light to moderate rain this evening. Rain will switch to snow showers overnight and Saturday morning before clearing and warming on Saturday afternoon.
The Science:
An elongated north-south oriented cold front is just offshore this morning and is pushing the high pressure ridge that the West Coast has been under to the east. Clouds will increase ahead of the weak front during the day today. A transitory high pressure ridge will build behind the front on Saturday and move east across the forecast area Sunday.
The Long Range:
A stronger front with lowering freezing levels will cross Stevens Pass on Sunday night with the potential for moderate snow. High pressure rebuilds for Monday and Tuesday.
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Precipitation Ending at
4am:
Today 24hr water = .25-.5 Snow = 1-3" Tomorrow’s 24hr water = <.25 snow = 0-2"
Trend and
Timing:
Precipitation will start out as rain around sunset tonight. It will switch to snow after midnight and Stevens Pass will see an inch or two before it turns to light snow showers which will end Saturday mid-morning.
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24hr temperature ending at 4
am tomorrow:
Low: 30 High:
36
Freezing level:
7000’ - 4000'
Trend and Timing:
As the warm air is pushed east, the temperature and freezing level will drop this afternoon. Freezing level will be around 5,000' when the precipitation starts, and lower further to pass level by 4am Saturday.
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24hr Winds (mph) ending at 4
am tomorrow:
Base: 0-5 E then 5-10 W
Ridge Top: 0-10
SSE then 10-20 WSW
Trend and Timing:
East flow will continue until frontal passage this evening, then winds will shift to westerly and increase until Saturday morning.
253 Dan
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