Issued: 2:37 PM PDT Monday, March 20, 2023
by Robert Hahn

Jump to: Weather Forecast I Precipitation I Snow Level I 5000' Temps I Ridgeline Winds I Extended Weather

Weather Synopsis

The remnants of a trough linger over the region Monday night, bringing scattered rain and snow showers that become more isolated overnight. With slightly more unstable air and light onshore winds, expect the chance for weak convergence aimed in the viscinity of the Mountain Loop. A weak surface low continues to produce wrap-around light rain and snow into the Wenatchee Mountain area through early Tuesday. Snow levels linger around 3500 ft with light ridgeline winds.

Split flow keeps us in a relatively dry and mild pattern Tuesday and Wednesday. Tuesday starts with mostly cloudy skies. Expect a chance of sprinkles and snow flurries in most areas early in the day. Skies become partly to mostly sunny with freezing levels rising to 4000-5000 ft. Winds will be light out of the E through the mountain gaps. Freezing levels drop to just above Snoqualmie Pass level Tuesday night. Expect dry conditions Wednesday morning with a chance for scattered or isolated showers Wednesday afternoon as a shortwave trough approaches. Snow levels should rise to around 4500-5500 ft in the afternoon.

 

Weather Forecast

Olympics
West North
West Central
West South
Stevens Pass
Snoqualmie Pass
East North
East Central
East South
Mt. Hood
Use dropdown to select your zone
Monday Night Decreasing light rain and snow showers.
Tuesday A few sprinkles/flurries in the morning then becoming partly to mostly sunny in the afternoon.
Monday Night Light rain and snow showers in the evening, becoming isolated overnight.
Tuesday Mostly cloudy with a chance of snow flurries in the morning, then becoming partly to mostly sunny in the afternoon.
Monday Night Rain/snow showers and possibly weak convergence during the evening hours. Rain/snow decreases overnight.
Tuesday Mostly cloudy with a chance of snow flurries in the morning, then becoming partly to mostly sunny in the afternoon.
Monday Night Decreasing light rain and snow showers, heaviest at Paradise.
Tuesday A chance of isolated sprinkles/flurries throughout the day. Mostly cloudy in the morning, then becoming partly cloudy by the afternoon.
Monday Night Decreasing light rain/snow showers. Light ridgeline and W wind becoming variable at the Pass by morning.
Tuesday Mostly cloudy with a chance of snow flurries in the morning, then becoming partly to mostly sunny in the afternoon. Light ridgeline and light variable switching E winds at the Pass.
Monday Night Decreasing light rain/snow showers. Light ridgeline and W wind becoming variable at the Pass by morning.
Tuesday Mostly cloudy with a chance of snow flurries in the morning, then becoming partly to mostly sunny in the afternoon. Light ridgeline and light variable switching E winds at the Pass.
Monday Night Decreasing light rain or snow showers.
Tuesday Mostly cloudy to start, then becoming mostly sunny by the afternoon.
Monday Night Decreasing light rain or snow showers with more consisting light rain/snow for the Wenatchee Mountains.
Tuesday Mostly cloudy in the morning with a few flurries/springkles, then becoming mostly sunny by the afternoon. Tapering light rain/snow in the Wenatchee mountains.
Monday Night Mostly cloudy with isolated very light rain or snow showers.
Tuesday Mostly cloudy with light rain or snow showers, then decreasing clouds in the afternoon.
Monday Night Light rain or snow showers in the evening, decrease or end overnight.
Tuesday Partly to mostly sunny skies.

Issued: 2:37 PM PDT Monday, March 20, 2023

Precipitation (in)

Monday Night Tuesday Tuesday Night Wednesday
5 pm - 5 am 5 am - 5 pm 5 pm - 5 am 5 am - 5 pm
Hurricane Ridge LT 0.10 LT 0.10 0 LT 0.10
Mt Baker Ski Area LT 0.10 LT 0.10 0 LT 0.10
Mt. Loop - Barlow Pass LT 0.25 LT 0.10 0 0
Stevens Pass LT 0.25 LT 0.10 0 LT 0.10
Snoqualmie Pass LT 0.25 LT 0.10 0 LT 0.10
Crystal Mt LT 0.10 LT 0.10 0 LT 0.10
Paradise LT 0.25 LT 0.10 0 LT 0.10
White Pass LT 0.10 LT 0.10 0 LT 0.10
Washington Pass LT 0.10 0 0 0
Mission Ridge LT 0.25 LT 0.25 0 0
Salmon la Sac - Gallagher Head LT 0.10 LT 0.10 0 0
Tieton River - Darland Mt. 0 LT 0.10 0 0
Mt Hood Meadows LT 0.10 0 0 LT 0.10
Timberline LT 0.25 0 0 LT 0.10
Hurricane Ridge Precipitation (in)
Monday Night LT 0.10
Tuesday LT 0.10
Tuesday Night 0
Wednesday LT 0.10
Mt Baker Ski Area Precipitation (in)
Monday Night LT 0.10
Tuesday LT 0.10
Tuesday Night 0
Wednesday LT 0.10
Mt. Loop - Barlow Pass Precipitation (in)
Monday Night LT 0.25
Tuesday LT 0.10
Tuesday Night 0
Wednesday 0
Stevens Pass Precipitation (in)
Monday Night LT 0.25
Tuesday LT 0.10
Tuesday Night 0
Wednesday LT 0.10
Snoqualmie Pass Precipitation (in)
Monday Night LT 0.25
Tuesday LT 0.10
Tuesday Night 0
Wednesday LT 0.10
Crystal Mt Precipitation (in)
Monday Night LT 0.10
Tuesday LT 0.10
Tuesday Night 0
Wednesday LT 0.10
Paradise Precipitation (in)
Monday Night LT 0.25
Tuesday LT 0.10
Tuesday Night 0
Wednesday LT 0.10
White Pass Precipitation (in)
Monday Night LT 0.10
Tuesday LT 0.10
Tuesday Night 0
Wednesday LT 0.10
Washington Pass Precipitation (in)
Monday Night LT 0.10
Tuesday 0
Tuesday Night 0
Wednesday 0
Mission Ridge Precipitation (in)
Monday Night LT 0.25
Tuesday LT 0.25
Tuesday Night 0
Wednesday 0
Salmon la Sac - Gallagher Head Precipitation (in)
Monday Night LT 0.10
Tuesday LT 0.10
Tuesday Night 0
Wednesday 0
Tieton River - Darland Mt. Precipitation (in)
Monday Night 0
Tuesday LT 0.10
Tuesday Night 0
Wednesday 0
Mt Hood Meadows Precipitation (in)
Monday Night LT 0.10
Tuesday 0
Tuesday Night 0
Wednesday LT 0.10
Timberline Precipitation (in)
Monday Night LT 0.25
Tuesday 0
Tuesday Night 0
Wednesday LT 0.10

Issued: 2:37 PM PDT Monday, March 20, 2023

Snow Level (ft)

Monday Evening Monday Night Tuesday Morning* Tuesday Afternoon* Tuesday Evening* Tuesday Night* Wednesday Morning Wednesday Afternoon
Olympics 3500' 3500' 3000' 3500' 5000' 4500' 4500' 4500'
West North 3500' 3500' 3500' 4000' 5000' 4000' 4000' 4500'
West Central 3500' 3000' 3000' 4000' 5000' 3500' 3500' 4500'
West South 3500' 3500' 3000' 4500' 5000' 4000' 3500' 4500'
Stevens Pass 3500' 3500' 3500' 4000' 5000' 3500' 3500' 4500'
Snoqualmie Pass 3500' 3500' 3000' 4000' 5000' 3500' 3500' 4500'
East North 4500' 3500' 3500' 5500' 5000' 3500' 3500' 5500'
East Central 4000' 3500' 3500' 4000' 4500' 3500' 3500' 5500'
East South 4000' 3000' 2500' 4000' 5000' 4000' 4500' 5500'
Mt. Hood 3000' 2500' 2000' 4000' 5000' 4000' 4000' 4500'
Olympics Elevation
Monday Evening 3500'
Monday Night 3500'
Tuesday Morning* 3000'
Tuesday Afternoon* 3500'
Tuesday Evening* 5000'
Tuesday Night* 4500'
Wednesday Morning 4500'
Wednesday Afternoon 4500'
West North Elevation
Monday Evening 3500'
Monday Night 3500'
Tuesday Morning* 3500'
Tuesday Afternoon* 4000'
Tuesday Evening* 5000'
Tuesday Night* 4000'
Wednesday Morning 4000'
Wednesday Afternoon 4500'
West Central Elevation
Monday Evening 3500'
Monday Night 3000'
Tuesday Morning* 3000'
Tuesday Afternoon* 4000'
Tuesday Evening* 5000'
Tuesday Night* 3500'
Wednesday Morning 3500'
Wednesday Afternoon 4500'
West South Elevation
Monday Evening 3500'
Monday Night 3500'
Tuesday Morning* 3000'
Tuesday Afternoon* 4500'
Tuesday Evening* 5000'
Tuesday Night* 4000'
Wednesday Morning 3500'
Wednesday Afternoon 4500'
Stevens Pass Elevation
Monday Evening 3500'
Monday Night 3500'
Tuesday Morning* 3500'
Tuesday Afternoon* 4000'
Tuesday Evening* 5000'
Tuesday Night* 3500'
Wednesday Morning 3500'
Wednesday Afternoon 4500'
Snoqualmie Pass Elevation
Monday Evening 3500'
Monday Night 3500'
Tuesday Morning* 3000'
Tuesday Afternoon* 4000'
Tuesday Evening* 5000'
Tuesday Night* 3500'
Wednesday Morning 3500'
Wednesday Afternoon 4500'
East North Elevation
Monday Evening 4500'
Monday Night 3500'
Tuesday Morning* 3500'
Tuesday Afternoon* 5500'
Tuesday Evening* 5000'
Tuesday Night* 3500'
Wednesday Morning 3500'
Wednesday Afternoon 5500'
East Central Elevation
Monday Evening 4000'
Monday Night 3500'
Tuesday Morning* 3500'
Tuesday Afternoon* 4000'
Tuesday Evening* 4500'
Tuesday Night* 3500'
Wednesday Morning 3500'
Wednesday Afternoon 5500'
East South Elevation
Monday Evening 4000'
Monday Night 3000'
Tuesday Morning* 2500'
Tuesday Afternoon* 4000'
Tuesday Evening* 5000'
Tuesday Night* 4000'
Wednesday Morning 4500'
Wednesday Afternoon 5500'
Mt. Hood Elevation
Monday Evening 3000'
Monday Night 2500'
Tuesday Morning* 2000'
Tuesday Afternoon* 4000'
Tuesday Evening* 5000'
Tuesday Night* 4000'
Wednesday Morning 4000'
Wednesday Afternoon 4500'

Issued: 2:37 PM PDT Monday, March 20, 2023

5000' Temperatures (°F)

Monday Night Tuesday
Max / Min Max / Min
Olympics 31 / 27 32 / 26
West North 31 / 28 35 / 28
West Central 30 / 27 34 / 27
West South 31 / 25 38 / 25
Stevens Pass 31 / 28 34 / 27
Snoqualmie Pass 31 / 28 34 / 27
East North 32 / 26 35 / 25
East Central 32 / 26 33 / 26
East South 32 / 26 36 / 26
Mt. Hood 31 / 27 36 / 27
Olympics 5000' Temperature Forecast
(Max / Min)
Monday Night 31 / 27
Tuesday 32 / 26
West North 5000' Temperature Forecast
(Max / Min)
Monday Night 31 / 28
Tuesday 35 / 28
West Central 5000' Temperature Forecast
(Max / Min)
Monday Night 30 / 27
Tuesday 34 / 27
West South 5000' Temperature Forecast
(Max / Min)
Monday Night 31 / 25
Tuesday 38 / 25
Stevens Pass 5000' Temperature Forecast
(Max / Min)
Monday Night 31 / 28
Tuesday 34 / 27
Snoqualmie Pass 5000' Temperature Forecast
(Max / Min)
Monday Night 31 / 28
Tuesday 34 / 27
East North 5000' Temperature Forecast
(Max / Min)
Monday Night 32 / 26
Tuesday 35 / 25
East Central 5000' Temperature Forecast
(Max / Min)
Monday Night 32 / 26
Tuesday 33 / 26
East South 5000' Temperature Forecast
(Max / Min)
Monday Night 32 / 26
Tuesday 36 / 26
Mt. Hood 5000' Temperature Forecast
(Max / Min)
Monday Night 31 / 27
Tuesday 36 / 27

Issued: 2:37 PM PDT Monday, March 20, 2023

Ridgeline Winds (mph)

Monday Evening Monday Night Tuesday Morning Tuesday Afternoon
Olympics SW 0-10 SE 0-10 E 0-10 ENE 0-10
West North SW 0-10 SSW 0-10 E 0-10 ESE 0-10
West Central WSW 5-15 WSW 5-15 NNE 0-10 ESE 5-15
West South WSW 0-10 WSW 0-10 E 0-10 E 5-15
Stevens Pass W 5-15 W 5-15 ENE 0-10 E 5-15
Snoqualmie Pass W 10-20 WNW 5-15 ENE 0-10 ESE 5-15
East North WNW 0-10 NW 0-10 E 0-10 ESE 5-15
East Central WNW 10-20 WNW 5-15 ENE 5-15 E 5-15
East South W 5-15 NW 0-10 ESE 0-10 ESE 5-15
Mt. Hood WSW 10-20 SSW 0-10 S 5-15 SE 5-15
Olympics Ridgeline Winds (mph)
Monday Evening SW 0-10
Monday Night SE 0-10
Tuesday Morning E 0-10
Tuesday Afternoon ENE 0-10
West North Ridgeline Winds (mph)
Monday Evening SW 0-10
Monday Night SSW 0-10
Tuesday Morning E 0-10
Tuesday Afternoon ESE 0-10
West Central Ridgeline Winds (mph)
Monday Evening WSW 5-15
Monday Night WSW 5-15
Tuesday Morning NNE 0-10
Tuesday Afternoon ESE 5-15
West South Ridgeline Winds (mph)
Monday Evening WSW 0-10
Monday Night WSW 0-10
Tuesday Morning E 0-10
Tuesday Afternoon E 5-15
Stevens Pass Ridgeline Winds (mph)
Monday Evening W 5-15
Monday Night W 5-15
Tuesday Morning ENE 0-10
Tuesday Afternoon E 5-15
Snoqualmie Pass Ridgeline Winds (mph)
Monday Evening W 10-20
Monday Night WNW 5-15
Tuesday Morning ENE 0-10
Tuesday Afternoon ESE 5-15
East North Ridgeline Winds (mph)
Monday Evening WNW 0-10
Monday Night NW 0-10
Tuesday Morning E 0-10
Tuesday Afternoon ESE 5-15
East Central Ridgeline Winds (mph)
Monday Evening WNW 10-20
Monday Night WNW 5-15
Tuesday Morning ENE 5-15
Tuesday Afternoon E 5-15
East South Ridgeline Winds (mph)
Monday Evening W 5-15
Monday Night NW 0-10
Tuesday Morning ESE 0-10
Tuesday Afternoon ESE 5-15
Mt. Hood Ridgeline Winds (mph)
Monday Evening WSW 10-20
Monday Night SSW 0-10
Tuesday Morning S 5-15
Tuesday Afternoon SE 5-15

Issued: 2:37 PM PDT Monday, March 20, 2023

Extended Weather Synopsis

A shortwave trough brings very light rain and snow showers as snow levels lower from 4500 to 3500 ft. A trough moving in from the Gulf of Alaska brings increasing light snow to the region that may become moderate in some areas late in the day. A front shifts frontal passage shifts SW winds to the W with the upper trough settling into the region during the afternoon. Expect moderate to strong ridgeline W winds at times late Thursday through Friday with moderate post-frontal snow showers focusing on the west slopes of the mountains and snow levels dropping to 1000-2000 ft.

Extended Snow Level (ft)

Wednesday Night Thursday Thursday Night Friday
West North 4000' 2500' 2000' 1000'
Snoqualmie Pass 4000' 2500' 1500' 1000'
Mt. Hood 4000' 3000' 1500' 1500'
West North Elevation
Wednesday Night 4000'
Thursday 2500'
Thursday Night 2000'
Friday 1000'
Snoqualmie Pass Elevation
Wednesday Night 4000'
Thursday 2500'
Thursday Night 1500'
Friday 1000'
Mt. Hood Elevation
Wednesday Night 4000'
Thursday 3000'
Thursday Night 1500'
Friday 1500'

Jump to: Weather Forecast I Precipitation I Snow Level I 5000' Temps I Ridgeline Winds I Extended Weather

Previous forecast from Mar 20, 2023

The NWAC program is administered by the USDA-Forest Service and operates from the National Weather Service Forecast Office in Seattle. NWAC services are made possible by important collaboration and support from a wide variety of federal, state and private cooperators.

The 5000’ temperature forecast does not imply a trend over the 12 hr period and only represents the max and min temperatures within a 12 hr period in the zone. The 6-hr snow level forecast, the forecast discussion, and weather forecast sections may add detail regarding temperature trends.

The snow level forecast represents the general snow level over a 6 hr time period. Freezing levels are forecast when precipitation is not expected.

*Easterly or offshore flow is highlighted with an asterisk when we expect relatively cool east winds in the major Cascade Passes. Easterly flow will often lead to temperature inversions and is a key variable for forecasting precipitation type in the Cascade Passes. Strong easterly flow events can affect terrain on a more regional scale.

Ridgeline winds are the average wind speed and direction over a 6 hr time period.

The wind forecast represents an elevation range instead of a single elevation slice. The elevation range overlaps with the near and above treeline elevation bands in the avalanche forecast and differs per zone.

Wind direction indicates the direction the wind originates or comes from on the 16-point compass rose.

Water Equivalent (WE) is the liquid water equivalent of all precipitation types; rain, snow, ice pellets, etc., forecast to the hundredth of an inch at specific locations. To use WE as a proxy for snowfall amounts, start with a snow to water ratio of 10:1 (10 inches of snow = 1 inch WE). Temperatures at or near freezing will generally have a lower ratio (heavy wet snow) and very cold temperatures can have a much higher ratio (dry fluffy snow).

The label LT, is shorthand for ‘less than’.