MOUNTAIN WEATHER FORECAST

Stevens Pass Mountain Weather Forecast

Tuesday, February 18, 2020, 0900

Current Observations:

24hr Precipitation:          0

Temperature profile:      13 base,  15 ridge

Pass level winds:              light   ENE

Barometer:                      1022mb’s and holding

Sky:                                  clear

Radar:                             clear

The Forecast:  Clear and sunny today with temperatures peaking in the upper 20’s.  Hit repeat for tomorrow.

The Science:  High pressure parked over the PNW will dominate the weather pattern for the next few days.  Warm air advection creeping up the western slopes, coupled with cooler easterly flow, will create a temperature inversion for the Cascade Crest.  Rh values (30-50%) should be low enough to keep the inversion cloud layer from forming.   This high pressure is expected to weakening and drifting south as the week progresses.    

Long Range. Clouds with light precipitation can be expected on Friday with snow likely for the weekend.

Confidence:  Good

Values from 4am today through 4am tomorrow.

Precipitation: Today 24hr water:0  snow:0 Tomorrow’s 24hr water:  0  snow:0 Trend and Timing: 0

Temperature: Low: 15   High: 28 Freezing level:   1000’ east slopes, 3000’ west slopes Trend and Timing: Temperature will have good daytime recovery with early morning lows in the teens.

Winds Base: 0-5 E Ridge Top:  5-10 E Trend and Timing: East flow will strengthen today and continue through at least Thursday.