April 21, 2018

Mountain Weather Forecast


Time and Day:  1000 Saturday

The Snapshot: Light snow showers and mostly cloudy, cool, today. Warm and sunny on Sunday.

The Science

Current Observations:  A strong inch of snow fell overnight, with temperatures falling down to 31 in the base area and 27 on the upper mountain overnight. Winds are moderate from the west, and the barometer has been steady.

The Forecast: A quick moving cool trough is transiting Washington today. Westerly flow behind it will maintain mostly cloudy skies Saturday. Precipitation should end after noon. High pressure rebuilds overnight Saturday, bringing a return to warm weather and clear skies.


The Long Range: A strong high pressure ridge will be over the PNW next week with sunny skies and freezing levels reaching 10,000’. The other kind of spring.

24hr values daily 4am to 4am.
Precipitation:
Saturday’s   24hr
water:  .1-.25   Snow: 1-3”

Sunday’s   24hr
water: 0     Snow: 0

Trend and Timing:
Snow showers should end Saturday afternoon. Sunday will be dry.

Temperature:
Low:  27   High: 35
Snow Level: 4000’

Trend and Timing:   
Daytime warming will likely bump temps above freezing across the mountain, but not by much and not for long.
 
Winds
Base: W 5-10
Ridge Top: WNW 5-15

Trend and Timing:
Winds will fizzle out midday Saturday and become light overnight.

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