December 18, 2015

MOUNTAIN WEATHER FORECAST

Time and Day: 11:00 Friday

The Snapshot:  Snow will shift to light showers this afternoon.  Tonight and tomorrow will be relatively dry with the next storm arriving early Sunday morning.

The Science:  The tail end of the frontal boundary has passed east of the mountains.  The precipitation will shift to showers and all but dry up tonight; temperatures will also begin fall.  Weak up level ridging will produce some clearing tonight; we might even get a peak at the sun tomorrow.  

A low-pressure system spinning off the BC coast will drive the next system toward the PNW early Sunday morning with another foot or more of snow expected by Monday morning. 

Long Range:  NW flow will keep snow in the forecast through the middle of next week.  A high-pressure system is beginning to appear in the long range models for a potentially dry and clear Christmas Holiday weekend.

Precipitation ending at 4 am:
Today’s 24hr Water = <.25   Snow = 1-3  

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

Trend and Timing:
Snow will taper off today.  The next front is expected late tomorrow night or early Sunday morning. 


24hr temperature ending at 4 am tomorrow: 
Low: 22  High: 30
Freezing level: 3500’   2500.'

Trends and Timing:
Freezing levels will fall to +-2500’ by early tomorrow morning.

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

Trend and Timing:
Wind will shift westerly winds today.  Light westerly flow will continue through tomorrow.



jM

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