December 4, 2019

MOUNTAIN WEATHER FORECAST



Stevens Pass Mountain Weather Forecast
Wednesday, December 4, 2019, 0900


Current Observations:
24hr Precipitation:                  .21 SWE, 0 snow
Temperature profile:                 37 base
Pass level winds:                      Light, westerly
Barometer:                             1010mbs and falling
Sky:                                          OC, obscure ridgtops
Radar:                 Rain falling over the northern mountain with the snow level around 6000’              


The Forecast:  Rain today with tonight and tomorrow trending dry.  Temperatures will be a bit cooler tonight but not cool enough.

Long Range: Rain returns for the weekend with freezing levels +-5000’.  No significant snow accumulation expectedL.  Next week will start out dry with another chance of moisture on Wednesday. 
  
The Science: The atmosphere will dry out tonight as pressure gradients weaken.  Warm SW flow will keep a warm air regime over the PNW through at least the middle of next week.   A low pressure system will bring rain showers to Stevens pass on Friday. A high pressure ridge slides into place early next week with cooler temperatures expected. 

Long range outlooks points to late next week as our next chance of snow.

Confidence: Good.

Values from 4am today through 4am tomorrow.
Precipitation:
Today 24hr
water: .25-.5 snow: trace

Tomorrow’s 24hr
water: lt.10th  snow: 0

Trend and Timing:
The rain will slowly taper off through the day with dry conditions expected tonight and tomorrow.


Temperature:
Low: 30   High: 38
Freezing level: 5500’ - 4500

Trend and Timing:   
Freezing levels will fall tonight to around 4500’ and push back up tomorrow.

 
Winds
Base: 0-5 W shifting E
Ridge Top: 0-10 W shifting S/SE

Trend and Timing:
East flow will develop at Pass level with SW flow aloft.


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0800 Start for Sunday 2/1/26, no ABS