November 29, 2015

MOUNTAIN WEATHER FORECAST

Time and Day: 0800 Sunday

The Snapshot:  Expect one more beautiful day before things begin to change tomorrow.   Snow? 

The Science:  High cirrus clouds will begin to move over the PNW tonight as a series of storms begins to make their approach.  The first will arrive tomorrow but split apart as it hits the wall of higher pressure, so not much is expected.  A warm front arrives late Tuesday night with more frontal systems moving through the region for the remainder of the week.

The trick for whether these storms will produce snow or not is east flow.  Tuesday nights front is a warm front with warmer air and a southwest fetch of moisture.  Freezing levels are expected to rise to near 4000’-5000’ along the western slopes. 

Initially, the cold air trapped in the eastern basin will provide east flow temperatures cool enough for snow at Stevens Pass.  Periods of rain and or freezing rain (east of the mountains) should be anticipated.  Storm totals with snow/rain amounts will be posted later today with better intel.    

Long Range:  More systems with similar characteristics will arrive on Thursday and then again on Friday.    A larger warm front is expected to bring higher freezing levels and potentially rain for the weekend.   



Precipitation ending at 4 am:

Today’s 24hr Water =  0  Snow = 0 

Tomorrow’s 24hr Water = <.10   Snow = trace 

Trend and Timing:
Dry today with very light snow tomorrow night.


24hr temperature ending at 4 am tomorrow: 
Low: 24  High: 30
Freezing level: 3000’ -4000.'

Trends and Timing:
The temperature inversion will continue until the front pushes through tomorrow night.

 
24hr Winds (mph) ending at 4 am tomorrow:
Base:  0-10 E
Ridge Top: 5-10 E  

Trend and Timing:
East flow will continue through early Tuesday morning.



JM

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