MOUNTAIN WEATHER FORECAST

Stevens Pass Mountain Weather Forecast

Day and Time:  Wednesday 0700

Current Observations:

24hr Precipitation:  0

Temperature profile: 24base,  38 ridges - A temperature inversion is underway with upper air temperatures reading in the upper 30’s with Pass levels in the mid 20’s.

Pass level winds: light and easterly

Barometer: 1013mb’s and falling

Sky: Clear

Radar: Dry with high clouds moving in

The Forecast:  Warmer today with increasing clouds.  Temperatures could reach into the mid to upper 40’s tomorrow with mixed rain and snow arriving early Friday morning.   

Long Range:  A mixed rain and snow event, hopefully turning to snow will begin early Friday morning.  Light snow showers with colder temperatures can be expected for the weekend.   

  

The Science:  A dry warm air mass will drift over the PNW today.  Freezing levels could peak above 7000’.   Luckily there is no moisture associated with this system.

A weakening cold front will push in early Friday morning with moisture in tow. Freezing levels will drop, but too or below 4000’ is still in question.  The moisture will likely start out as light rain below 4500’ with snow mixing in through the day.   Confidence in this is fair.

 The record setting cold air mass sinking in to the middle of the country will makes its way west over the weekend.  The PNW won’t see below zero temperatures, but will see a significant cooling effect. 

Values from 4am today through

 4am tomorrow.

Precipitation: Today 24hr water: 0  snow: 0 Tomorrow’s 24hr water: .24  snow: 0-2 Trend and Timing: Dry through early Friday morning.

Temperature: Low: 24    High: 40 Freezing level: 7000’ Trend and Timing:    Freezing levels will peak near at or above 7000’ today.

Winds Base: 0-5 E shifting SW Ridge Top: 0-10 WNW Trend and Timing: Westerly flow will develop today and remain the general wind pattern through tomorrow.