Jump to: Weather Forecast I Precipitation I Snow Level I 5000' Temps I Ridgeline Winds I Extended Weather
Weather Synopsis
The Pacific Northwest will experience very active and wintery weather throughout the forecast period.
A cool trough remains in place Monday afternoon with light to moderate W flow combined with cold temperatures aloft to efficiently touch off low-density snow showers with rain/snow lines around 1000-1500 ft.
The pattern remains in place Monday night, but a developing deep low offshore gives the flow a more SWerly wind direction as we head into the overnight hours.Expect significant snow accumulations to continue for the western slopes of the Cascades and Olympics, with most areas picking up 2-6" of snow, but 6-12" amounts are likely for Mt St Helens and Mt Rainier.
Mostly light snow showers generally end early Tuesday a deep upper low off Heida Gwaii pulls down cold air from the Gulf of Alaska, invigorating and rapidly intensifying a newly formed surface low. By Tuesday evening this low-pressure center drops to 940-945 mb, rivaling the strength of hurricanes.
The result will be more cloudy weather with light snow at times on Tuesday morning. Increasing light to moderate ESE winds through the mountain gaps and SSW winds aloft will focus some mostly light snowfall on the east slopes of the Cascades, the Olympics, and southern Volcanoes by the afternoon/
This whole package intensifies very rapidly during the evening hours as the storm reaches peak strength in our offshore waters as it lifts northward. Expect moderate to heavy snowfall focusing on similar areas with lighter snowfall spreading into the western central and northern Cascades. E winds driven by circulation around the low combined with -14 mb cross-cascade pressure gradients (very strong) will create blizzard conditions in the mountain passes and breaking mountain waves could produce damaging winds in the western Cascade Foothills with gusts in the 50-75 mph range over widespread areas.
A warming trend that started Tuesday evening will continue on Wednesday as precipitation decreases in the light to moderate range with decreasing E winds continuing to focus more precipitation along the E slopes of the ranges and SSW winds aloft favoring the volcanoes.
Weather Forecast
| Monday Night | Light snow showers. Locally intense at times. |
|---|---|
| Tuesday | Cloudy in the northern Olympics with increasing light to moderate snow developing in the southern and eastern Olympics. Light ridgeline winds become moderate in the afternoon with strong gusts. |
| Monday Night | Light to occasionally moderate snow showers. Locally heavy at times. |
|---|---|
| Tuesday | Light snow showers mostly ending, then remaining cloudy with very light snow possible at times. Light ridgeline winds become moderate in the afternoon with strong gusts. |
| Monday Night | Light to occasionally moderate snow showers. Locally heavy at times. |
|---|---|
| Tuesday | Light snow showers ending early, then remaining cloudy. Light ridgeline winds become moderate in the afternoon with strong gusts. |
| Monday Night | Light to moderate snow showers, heaviest at Paradise. Locally intense at times. |
|---|---|
| Tuesday | Light snow showers transition to periods of light snow. Light ridgeline winds become moderate in the afternoon with strong gusts. |
| Monday Night | Light snow showers. Light ridgeline and W wind at the Pass shifting E overnight. |
|---|---|
| Tuesday | A few snow showers in the morning, then cloudy conditions in the afternoon. Light ridgeline and E winds at the pass in the morning. Ridgeline winds increase into the moderate range in the afternoon. |
| Monday Night | Light snow showers. Light ridgeline and W wind at the Pass shifting E overnight. |
|---|---|
| Tuesday | A few snow showers in the morning, then cloudy conditions in the afternoon. Light ridgeline and E winds at the pass in the morning. Ridgeline winds increase into the moderate range in the afternoon. |
| Monday Night | Mostly cloudy with occasional light snow showers. |
|---|---|
| Tuesday | Cloudy with occasional snow showers in the morning and occasional light snow late in the day. Light ridgeline winds increase into the moderate range during the afternoon. |
| Monday Night | Mostly cloudy with light snow showers at times. |
|---|---|
| Tuesday | Cloudy with occasional snow showers in the morning and occasional light snow in the afternoon. Light ridgeline winds increase into the moderate range during the afternoon. |
| Monday Night | Mostly cloudy with light snow showers at times. |
|---|---|
| Tuesday | Cloudy with occasional snow showers in the morning and steady light snow develops in the afternoon. Light ridgeline winds increase into the moderate range during the afternoon. |
| Monday Night | Light to moderate snow showers may be locally intense at times. Moderate ridgeline winds. |
|---|---|
| Tuesday | Light snow showers in the morning becoming steady and increasing light to potentially moderate snow in the afternoon. Increasing moderate ridgeline winds with strong gusts likely in the afternoon. |
Issued: 2:23 PM PST Monday, November 18, 2024
Precipitation (in)
| Monday Night | Tuesday | Tuesday Night | Wednesday | |
|---|---|---|---|---|
| 4 pm - 4 am | 4 am - 4 pm | 4 pm - 4 am | 4 am - 4 pm | |
| Hurricane Ridge | LT 0.25 | 0 | 0.50 - 0.75 | 0.25 |
| Mt Baker Ski Area | 0.25 | LT 0.10 | 0.75 | 0.25 - 0.50 |
| Mt. Loop - Barlow Pass | 0.25 | LT 0.10 | 0.50 | LT 0.25 |
| Stevens Pass | LT 0.10 | LT 0.10 | 0.25 - 0.50 | LT 0.10 |
| Snoqualmie Pass | LT 0.25 | LT 0.10 | 0.25 - 0.50 | LT 0.10 |
| Crystal Mt | LT 0.10 | LT 0.10 | 0.25 - 0.50 | 0.25 |
| Paradise | 0.50 | LT 0.10 | 1.00 | 0.25 |
| White Pass | LT 0.25 | LT 0.10 | 0.75 -1.00 | 0.25 |
| Washington Pass | 0 | LT 0.10 | 0.50 | LT 0.25 |
| Mission Ridge | LT 0.10 | LT 0.10 | 0.75 | 0.25 |
| Salmon la Sac - Gallagher Head | LT 0.10 | LT 0.10 | 0.75 | 0.25 |
| Tieton River - Darland Mt. | LT 0.10 | LT 0.10 | 1.00 | 0.25 |
| Mt Hood Meadows | 0.25 | 0.25 | 1.00 | 0.25 |
| Timberline | 0.25 | 0.25 | 1.00 | 0.25 |
| Hurricane Ridge | Precipitation (in) |
|---|---|
| Monday Night | LT 0.25 |
| Tuesday | 0 |
| Tuesday Night | 0.50 - 0.75 |
| Wednesday | 0.25 |
| Mt Baker Ski Area | Precipitation (in) |
|---|---|
| Monday Night | 0.25 |
| Tuesday | LT 0.10 |
| Tuesday Night | 0.75 |
| Wednesday | 0.25 - 0.50 |
| Mt. Loop - Barlow Pass | Precipitation (in) |
|---|---|
| Monday Night | 0.25 |
| Tuesday | LT 0.10 |
| Tuesday Night | 0.50 |
| Wednesday | LT 0.25 |
| Stevens Pass | Precipitation (in) |
|---|---|
| Monday Night | LT 0.10 |
| Tuesday | LT 0.10 |
| Tuesday Night | 0.25 - 0.50 |
| Wednesday | LT 0.10 |
| Snoqualmie Pass | Precipitation (in) |
|---|---|
| Monday Night | LT 0.25 |
| Tuesday | LT 0.10 |
| Tuesday Night | 0.25 - 0.50 |
| Wednesday | LT 0.10 |
| Crystal Mt | Precipitation (in) |
|---|---|
| Monday Night | LT 0.10 |
| Tuesday | LT 0.10 |
| Tuesday Night | 0.25 - 0.50 |
| Wednesday | 0.25 |
| Paradise | Precipitation (in) |
|---|---|
| Monday Night | 0.50 |
| Tuesday | LT 0.10 |
| Tuesday Night | 1.00 |
| Wednesday | 0.25 |
| White Pass | Precipitation (in) |
|---|---|
| Monday Night | LT 0.25 |
| Tuesday | LT 0.10 |
| Tuesday Night | 0.75 -1.00 |
| Wednesday | 0.25 |
| Washington Pass | Precipitation (in) |
|---|---|
| Monday Night | 0 |
| Tuesday | LT 0.10 |
| Tuesday Night | 0.50 |
| Wednesday | LT 0.25 |
| Mission Ridge | Precipitation (in) |
|---|---|
| Monday Night | LT 0.10 |
| Tuesday | LT 0.10 |
| Tuesday Night | 0.75 |
| Wednesday | 0.25 |
| Salmon la Sac - Gallagher Head | Precipitation (in) |
|---|---|
| Monday Night | LT 0.10 |
| Tuesday | LT 0.10 |
| Tuesday Night | 0.75 |
| Wednesday | 0.25 |
| Tieton River - Darland Mt. | Precipitation (in) |
|---|---|
| Monday Night | LT 0.10 |
| Tuesday | LT 0.10 |
| Tuesday Night | 1.00 |
| Wednesday | 0.25 |
| Mt Hood Meadows | Precipitation (in) |
|---|---|
| Monday Night | 0.25 |
| Tuesday | 0.25 |
| Tuesday Night | 1.00 |
| Wednesday | 0.25 |
| Timberline | Precipitation (in) |
|---|---|
| Monday Night | 0.25 |
| Tuesday | 0.25 |
| Tuesday Night | 1.00 |
| Wednesday | 0.25 |
Issued: 2:23 PM PST Monday, November 18, 2024
Snow Level (ft)
| Monday Evening | Monday Night* | Tuesday Morning* | Tuesday Afternoon* | Tuesday Evening* | Tuesday Night* | Wednesday Morning* | Wednesday Afternoon* | |
|---|---|---|---|---|---|---|---|---|
| Olympics | 1000' | 1000' | 1000' | 2000' | 2500' | 3000' | 3000' | 3000' |
| West North | 1000' | 1000' | 500' | 2000' | 1500' | 2000' | 2500' | 3000' |
| West Central | 1000' | 1000' | 1000' | 2500' | 1500' | 2000' | 2500' | 3000' |
| West South | 1000' | 1000' | 1000' | 2000' | 2000' | 2500' | 3000' | 3500' |
| Stevens Pass | 1000' | 1000' | 500' | 1500' | 1500' | 2000' | 2500' | 3000' |
| Snoqualmie Pass | 1000' | 1000' | 1000' | 1500' | 2000' | 2500' | 2500' | 3000' |
| East North | 500' | 500' | 0 | 1000' | 1000' | 1500' | 2000' | 3000' |
| East Central | 1000' | 1000' | 1000' | 1500' | 2000' | 2000' | 2500' | 3000' |
| East South | 1000' | 1000' | 1500' | 2000' | 2000' | 2500' | 3000' | 3500' |
| Mt. Hood | 1500' | 2000' | 2500' | 3000' | 3500' | 4000' | 4000' | 4000' |
| Olympics | Elevation |
|---|---|
| Monday Evening | 1000' |
| Monday Night* | 1000' |
| Tuesday Morning* | 1000' |
| Tuesday Afternoon* | 2000' |
| Tuesday Evening* | 2500' |
| Tuesday Night* | 3000' |
| Wednesday Morning* | 3000' |
| Wednesday Afternoon* | 3000' |
| West North | Elevation |
|---|---|
| Monday Evening | 1000' |
| Monday Night* | 1000' |
| Tuesday Morning* | 500' |
| Tuesday Afternoon* | 2000' |
| Tuesday Evening* | 1500' |
| Tuesday Night* | 2000' |
| Wednesday Morning* | 2500' |
| Wednesday Afternoon* | 3000' |
| West Central | Elevation |
|---|---|
| Monday Evening | 1000' |
| Monday Night* | 1000' |
| Tuesday Morning* | 1000' |
| Tuesday Afternoon* | 2500' |
| Tuesday Evening* | 1500' |
| Tuesday Night* | 2000' |
| Wednesday Morning* | 2500' |
| Wednesday Afternoon* | 3000' |
| West South | Elevation |
|---|---|
| Monday Evening | 1000' |
| Monday Night* | 1000' |
| Tuesday Morning* | 1000' |
| Tuesday Afternoon* | 2000' |
| Tuesday Evening* | 2000' |
| Tuesday Night* | 2500' |
| Wednesday Morning* | 3000' |
| Wednesday Afternoon* | 3500' |
| Stevens Pass | Elevation |
|---|---|
| Monday Evening | 1000' |
| Monday Night* | 1000' |
| Tuesday Morning* | 500' |
| Tuesday Afternoon* | 1500' |
| Tuesday Evening* | 1500' |
| Tuesday Night* | 2000' |
| Wednesday Morning* | 2500' |
| Wednesday Afternoon* | 3000' |
| Snoqualmie Pass | Elevation |
|---|---|
| Monday Evening | 1000' |
| Monday Night* | 1000' |
| Tuesday Morning* | 1000' |
| Tuesday Afternoon* | 1500' |
| Tuesday Evening* | 2000' |
| Tuesday Night* | 2500' |
| Wednesday Morning* | 2500' |
| Wednesday Afternoon* | 3000' |
| East North | Elevation |
|---|---|
| Monday Evening | 500' |
| Monday Night* | 500' |
| Tuesday Morning* | 0' |
| Tuesday Afternoon* | 1000' |
| Tuesday Evening* | 1000' |
| Tuesday Night* | 1500' |
| Wednesday Morning* | 2000' |
| Wednesday Afternoon* | 3000' |
| East Central | Elevation |
|---|---|
| Monday Evening | 1000' |
| Monday Night* | 1000' |
| Tuesday Morning* | 1000' |
| Tuesday Afternoon* | 1500' |
| Tuesday Evening* | 2000' |
| Tuesday Night* | 2000' |
| Wednesday Morning* | 2500' |
| Wednesday Afternoon* | 3000' |
| East South | Elevation |
|---|---|
| Monday Evening | 1000' |
| Monday Night* | 1000' |
| Tuesday Morning* | 1500' |
| Tuesday Afternoon* | 2000' |
| Tuesday Evening* | 2000' |
| Tuesday Night* | 2500' |
| Wednesday Morning* | 3000' |
| Wednesday Afternoon* | 3500' |
| Mt. Hood | Elevation |
|---|---|
| Monday Evening | 1500' |
| Monday Night* | 2000' |
| Tuesday Morning* | 2500' |
| Tuesday Afternoon* | 3000' |
| Tuesday Evening* | 3500' |
| Tuesday Night* | 4000' |
| Wednesday Morning* | 4000' |
| Wednesday Afternoon* | 4000' |
Issued: 2:23 PM PST Monday, November 18, 2024
5000' Temperatures (°F)
| Monday Night | Tuesday | ||
|---|---|---|---|
| Max / Min | Max / Min | ||
| Olympics | 22 / 19 | 29 / 19 | |
| West North | 22 / 19 | 27 / 19 | |
| West Central | 24 / 19 | 26 / 18 | |
| West South | 24 / 22 | 30 / 22 | |
| Stevens Pass | 23 / 19 | 26 / 19 | |
| Snoqualmie Pass | 24 / 20 | 25 / 19 | |
| East North | 20 / 11 | 18 / 10 | |
| East Central | 22 / 19 | 25 / 18 | |
| East South | 23 / 19 | 27 / 21 | |
| Mt. Hood | 26 / 23 | 29 / 24 |
| Olympics | 5000' Temperature Forecast (Max / Min) |
|---|---|
| Monday Night | 22 / 19 |
| Tuesday | 29 / 19 |
| West North | 5000' Temperature Forecast (Max / Min) |
|---|---|
| Monday Night | 22 / 19 |
| Tuesday | 27 / 19 |
| West Central | 5000' Temperature Forecast (Max / Min) |
|---|---|
| Monday Night | 24 / 19 |
| Tuesday | 26 / 18 |
| West South | 5000' Temperature Forecast (Max / Min) |
|---|---|
| Monday Night | 24 / 22 |
| Tuesday | 30 / 22 |
| Stevens Pass | 5000' Temperature Forecast (Max / Min) |
|---|---|
| Monday Night | 23 / 19 |
| Tuesday | 26 / 19 |
| Snoqualmie Pass | 5000' Temperature Forecast (Max / Min) |
|---|---|
| Monday Night | 24 / 20 |
| Tuesday | 25 / 19 |
| East North | 5000' Temperature Forecast (Max / Min) |
|---|---|
| Monday Night | 20 / 11 |
| Tuesday | 18 / 10 |
| East Central | 5000' Temperature Forecast (Max / Min) |
|---|---|
| Monday Night | 22 / 19 |
| Tuesday | 25 / 18 |
| East South | 5000' Temperature Forecast (Max / Min) |
|---|---|
| Monday Night | 23 / 19 |
| Tuesday | 27 / 21 |
| Mt. Hood | 5000' Temperature Forecast (Max / Min) |
|---|---|
| Monday Night | 26 / 23 |
| Tuesday | 29 / 24 |
Issued: 2:23 PM PST Monday, November 18, 2024
Ridgeline Winds (mph)
| Monday Evening | Monday Night | Tuesday Morning | Tuesday Afternoon | |
|---|---|---|---|---|
| Olympics | SSW 0-10 | SSW 5-15 | S 5-15 | SSE 20-30 |
| West North | SSW 0-10 | SSE 5-15 | SSE 10-20 | SE 15-25 |
| West Central | SW 5-15 | S 0-10 | SE 5-15 | ESE 20-30 |
| West South | SW 5-15 | SW 5-15 | S 5-15 | SE 15-25 |
| Stevens Pass | WSW 5-15 | SSW 0-10 | SE 5-15 | ESE 15-25 |
| Snoqualmie Pass | W 5-15 | SSW 0-10 | ESE 10-20 | ESE 25-35 |
| East North | WSW 5-15 | SSW 0-10 | SE 5-15 | SE 15-25 |
| East Central | W 10-20 | WSW 5-15 | S 5-15 | SE 15-25 |
| East South | W 5-15 | WSW 10-20 | S 5-15 | SE 15-25 |
| Mt. Hood | WSW 20-30 | SW 10-20 | SW 10-20 | S 20-30 |
| Olympics | Ridgeline Winds (mph) |
|---|---|
| Monday Evening | SSW 0-10 |
| Monday Night | SSW 5-15 |
| Tuesday Morning | S 5-15 |
| Tuesday Afternoon | SSE 20-30 |
| West North | Ridgeline Winds (mph) |
|---|---|
| Monday Evening | SSW 0-10 |
| Monday Night | SSE 5-15 |
| Tuesday Morning | SSE 10-20 |
| Tuesday Afternoon | SE 15-25 |
| West Central | Ridgeline Winds (mph) |
|---|---|
| Monday Evening | SW 5-15 |
| Monday Night | S 0-10 |
| Tuesday Morning | SE 5-15 |
| Tuesday Afternoon | ESE 20-30 |
| West South | Ridgeline Winds (mph) |
|---|---|
| Monday Evening | SW 5-15 |
| Monday Night | SW 5-15 |
| Tuesday Morning | S 5-15 |
| Tuesday Afternoon | SE 15-25 |
| Stevens Pass | Ridgeline Winds (mph) |
|---|---|
| Monday Evening | WSW 5-15 |
| Monday Night | SSW 0-10 |
| Tuesday Morning | SE 5-15 |
| Tuesday Afternoon | ESE 15-25 |
| Snoqualmie Pass | Ridgeline Winds (mph) |
|---|---|
| Monday Evening | W 5-15 |
| Monday Night | SSW 0-10 |
| Tuesday Morning | ESE 10-20 |
| Tuesday Afternoon | ESE 25-35 |
| East North | Ridgeline Winds (mph) |
|---|---|
| Monday Evening | WSW 5-15 |
| Monday Night | SSW 0-10 |
| Tuesday Morning | SE 5-15 |
| Tuesday Afternoon | SE 15-25 |
| East Central | Ridgeline Winds (mph) |
|---|---|
| Monday Evening | W 10-20 |
| Monday Night | WSW 5-15 |
| Tuesday Morning | S 5-15 |
| Tuesday Afternoon | SE 15-25 |
| East South | Ridgeline Winds (mph) |
|---|---|
| Monday Evening | W 5-15 |
| Monday Night | WSW 10-20 |
| Tuesday Morning | S 5-15 |
| Tuesday Afternoon | SE 15-25 |
| Mt. Hood | Ridgeline Winds (mph) |
|---|---|
| Monday Evening | WSW 20-30 |
| Monday Night | SW 10-20 |
| Tuesday Morning | SW 10-20 |
| Tuesday Afternoon | S 20-30 |
Issued: 2:23 PM PST Monday, November 18, 2024
Extended Weather Synopsis
The deep mid-latitude cyclone bringing wild weather early in the week continues to rotate off the British Columbia coastline, spinning waves of light to occasionally moderate rain and snow into our region as snow levels continue to gradually rise. Expect somewhat cooler temperatures east of the Cascade Crest, a wintry mix at times through the Cascade Gaps, and a transition to rain at middle elevations along the western slopes of the Cascades Thursday through Friday.
Extended Snow Level (ft)
| Wednesday Night* | Thursday * | Thursday Night* | Friday * | |
|---|---|---|---|---|
| West North | 2500' | 3000' | 3500' | 4000' |
| Snoqualmie Pass | 3000' | 3000' | 4000' | 5000' |
| Mt. Hood | 4000' | 5000' | 6000' | 6500' |
| West North | Elevation |
|---|---|
| Wednesday Night* | 2500' |
| Thursday * | 3000' |
| Thursday Night* | 3500' |
| Friday * | 4000' |
| Snoqualmie Pass | Elevation |
|---|---|
| Wednesday Night* | 3000' |
| Thursday * | 3000' |
| Thursday Night* | 4000' |
| Friday * | 5000' |
| Mt. Hood | Elevation |
|---|---|
| Wednesday Night* | 4000' |
| Thursday * | 5000' |
| Thursday Night* | 6000' |
| Friday * | 6500' |
Jump to: Weather Forecast I Precipitation I Snow Level I 5000' Temps I Ridgeline Winds I Extended Weather
Previous forecast from Nov 17, 2024
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.