November 17, 2015

MOUNTAIN WEATHER FORECAST

Time and Day: 0800 Tuesday

The Snapshot:  A bit damp and windy today.  The heavy rain changes to snow tonight, intermittent snow showers will be possible through Thursday morning.  Drier and cooler weather will end the week. 

The Science:  The 8” or so of snow we receive last night is quickly being washed away by the heavy rain. The rain took over around midnight and will continue through most of  the daylight hours. 

A cold front will swing through this evening changing the rain to snow.  Moderate to heavy snow can be expected as the front approaches, but the moisture will shift to showers once the front moves east of the mountains. Freezing levels are expected to fall below 4000’ this evening with snow falling into the early morning hours.  A low-pressure system tracking along the Oregon/Washington border tomorrow night, will spin weak bands of moisture north; there will be little love for Stevens Pass with just a few inches of snow likely.  The week will end dry and cool as an upper-level high-pressure ridge begins to build Thursday afternoon.     

Long Range:  This past wet weather madness will shift to a drier pattern starting on Thursday and will likely continuing into early next week.    


Precipitation ending at 4 am:

Today’s 24hr Water = 2   Snow = 4-8 

Tomorrow’s 24hr Water = .25   Snow = 2-4

Trend and Timing:
Rain turns back to snow sometime after 4 pm today.  Snow will slowly shift to showers through the night and eventually taper off tomorrow. 


24hr temperature ending at 4 am tomorrow: 
Low: 24  High: 40
Freezing level: 7000’ – 3000.'

Trends and Timing:
Freezing levels are expected to drop below 4000’ this afternoon.  Surface temperatures should remain below freezing for the remainder of the week.

 
24hr Winds (mph) ending at 4 am tomorrow:
Base: 10-20 W gusty
Ridge Top:   20-40 W gusty

Trend and Timing:
Strong winds will continue into tonight.  The winds mellow out tomorrow.
 


JM

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