Jump to: Weather Forecast I Snow/Freezing Level I Precipitation I Free Winds 5k I Free Winds 9k I Extended Weather
Weather Synopsis for Tuesday night through Monday
A strong blocking ridge offshore continues to dominate Pacific Northwest weather for the rest of the week, bringing northerly flow aloft, continued mild temperatures, dry weather with low relative humidities in the mountains, and very light or variable winds. The blocking ridge keeps us in a "stuck" pattern with disturbance forming closed lows splitting off the main jet in the vicinity of SE Alaska and dropping southward offshore. The first of these disturbances currently passing over the region is very weak.
A moderate inversion mixed out by mid-morning on Tuesday. Temperatures at Leavenworth and Crystal Base rose an impressive 11F and 15F, respectively, from 9-10 AM.
Another moderate inversion forms overnight as a disturbance passing down our coastline today brings the high clouds currently over the region southward. The inversion should once again mix out by mid-morning on Wednesday, with Washington experiencing more direct sunshine, while filtered sunshine can be expected for Mt. Hood. Temperatures should peak later in the day as offshore ridging works further onshore.
Wednesday night should be clear and mild once again with the ridging over the region becoming slightly more pronounced and providing another sunny, warm day on Thursday as the next closed low moves southward, but stays well offshore.
Freezing levels hold relatively steady in the 4000-6000 ft range with significant diurnal influence.
Weather Forecast
Hurricane Ridge
| Tuesday Night | Mostly clear skies. Mild at upper elevations with an inversion forming below 5000 ft. |
| Wednesday | Clear skies and warm temperatures with the inversion mixing out by around 10 AM. |
Mt. Baker
| Tuesday Night | Mostly clear skies. Mild at upper elevations with an inversion forming below 5000 ft. |
| Wednesday | Clear skies and warm temperatures with the inversion mixing out by around 10 AM. |
Washington Pass and Leavenworth
| Tuesday Night | Clouds lingering for the central and south Cascades, exiting by morning. Mild at upper elevations with an inversion forming below 5000 ft. |
| Wednesday | Clear skies and warm temperatures with the inversion mixing out by around 10 AM. |
Stevens and Snoqualmie Pass
| Tuesday Night | Some thin high clouds lingering into the evening for Stevens Pass and until around midnight for Snoqualmie Pass, then decreasing and becoming scattered. Mild at upper elevations with an inversion forming below 5000 ft. Light E winds through the mountain gaps. |
| Wednesday | Mostly sunny. Warm temperatures with the inversion mixing out by around 10 AM. |
Mt. Rainier, Crystal and White Pass
| Tuesday Night | High clouds lingering until around midnight and then becoming scattered. Mild at upper elevations with an inversion forming below 5000 ft. |
| Wednesday | Mostly sunny with a few high clouds. Warm temperatures with the inversion mixing out by around 10 AM. |
Mt. Hood
| Tuesday Night | High clouds. Mild at upper elevations with an inversion forming below 5000 ft. |
| Wednesday | High clouds in the morning with some slightly thicker mid-level clouds possible in the afternoon. Warm temperatures with the inversion mixing out by around 10 AM. |
Issued: 2:13 PM PDT Tuesday, March 17, 2020
Snow/Freezing Level (ft)
| Hurricane Ridge | Mt. Baker | Washington Pass | Leavenworth | Stevens Pass | Snoqualmie Pass | Mt. Rainier, Crystal & White Pass | Mt. Hood | ||
|---|---|---|---|---|---|---|---|---|---|
| Tuesday Evening | Freezing Level * | 6500' | 5500' | 5500' | 5000' | 5500' | 6000' | 6000' | 6000' |
| Tuesday Night | Freezing Level | 5000' | 4000' | 3500' | 3500' | 4000' | 4000' | 4500' | 3500' |
| Wednesday Morning | Freezing Level | 5000' | 4000' | 4000' | 4000' | 4000' | 4500' | 4500' | 3500' |
| Wednesday Afternoon | Freezing Level | 6000' | 5000' | 5500' | 5500' | 5500' | 5500' | 5500' | 4500' |
| Wednesday Evening | Snow Level | 6000' | 5500' | 5500' | 6000' | 5500' | 5500' | 5500' | 5000' |
| Wednesday Night | Snow Level | 5500' | 4000' | 4000' | 4500' | 4000' | 4000' | 5000' | 4500' |
| Thursday Morning | Snow Level | 5000' | 4500' | 4500' | 4500' | 4500' | 4500' | 5000' | 4500' |
| Thursday Afternoon | Snow Level * | 5500' | 5500' | 5500' | 5000' | 5500' | 5500' | 600' | 5500' |
| Hurricane Ridge | Elevation |
|---|---|
| Tuesday Evening |
Freezing Level 6500' (Easterly Flow *) |
| Tuesday Night |
Freezing Level 5000' |
| Wednesday Morning |
Freezing Level 5000' |
| Wednesday Afternoon |
Freezing Level 6000' |
| Wednesday Evening |
Snow Level 6000' |
| Wednesday Night |
Snow Level 5500' |
| Thursday Morning |
Snow Level 5000' |
| Thursday Afternoon |
Snow Level 5500' (Easterly Flow *) |
| Mt. Baker | Elevation |
|---|---|
| Tuesday Evening |
Freezing Level 5500' (Easterly Flow *) |
| Tuesday Night |
Freezing Level 4000' |
| Wednesday Morning |
Freezing Level 4000' |
| Wednesday Afternoon |
Freezing Level 5000' |
| Wednesday Evening |
Snow Level 5500' |
| Wednesday Night |
Snow Level 4000' |
| Thursday Morning |
Snow Level 4500' |
| Thursday Afternoon |
Snow Level 5500' (Easterly Flow *) |
| Washington Pass | Elevation |
|---|---|
| Tuesday Evening |
Freezing Level 5500' (Easterly Flow *) |
| Tuesday Night |
Freezing Level 3500' |
| Wednesday Morning |
Freezing Level 4000' |
| Wednesday Afternoon |
Freezing Level 5500' |
| Wednesday Evening |
Snow Level 5500' |
| Wednesday Night |
Snow Level 4000' |
| Thursday Morning |
Snow Level 4500' |
| Thursday Afternoon |
Snow Level 5500' (Easterly Flow *) |
| Leavenworth | Elevation |
|---|---|
| Tuesday Evening |
Freezing Level 5000' (Easterly Flow *) |
| Tuesday Night |
Freezing Level 3500' |
| Wednesday Morning |
Freezing Level 4000' |
| Wednesday Afternoon |
Freezing Level 5500' |
| Wednesday Evening |
Snow Level 6000' |
| Wednesday Night |
Snow Level 4500' |
| Thursday Morning |
Snow Level 4500' |
| Thursday Afternoon |
Snow Level 5000' (Easterly Flow *) |
| Stevens Pass | Elevation |
|---|---|
| Tuesday Evening |
Freezing Level 5500' (Easterly Flow *) |
| Tuesday Night |
Freezing Level 4000' |
| Wednesday Morning |
Freezing Level 4000' |
| Wednesday Afternoon |
Freezing Level 5500' |
| Wednesday Evening |
Snow Level 5500' |
| Wednesday Night |
Snow Level 4000' |
| Thursday Morning |
Snow Level 4500' |
| Thursday Afternoon |
Snow Level 5500' (Easterly Flow *) |
| Snoqualmie Pass | Elevation |
|---|---|
| Tuesday Evening |
Freezing Level 6000' (Easterly Flow *) |
| Tuesday Night |
Freezing Level 4000' |
| Wednesday Morning |
Freezing Level 4500' |
| Wednesday Afternoon |
Freezing Level 5500' |
| Wednesday Evening |
Snow Level 5500' |
| Wednesday Night |
Snow Level 4000' |
| Thursday Morning |
Snow Level 4500' |
| Thursday Afternoon |
Snow Level 5500' (Easterly Flow *) |
| Mt. Rainier & Crystal | Elevation |
|---|---|
| Tuesday Evening |
Freezing Level 6000' (Easterly Flow *) |
| Tuesday Night |
Freezing Level 4500' |
| Wednesday Morning |
Freezing Level 4500' |
| Wednesday Afternoon |
Freezing Level 5500' |
| Wednesday Evening |
Snow Level 5500' |
| Wednesday Night |
Snow Level 5000' |
| Thursday Morning |
Snow Level 5000' |
| Thursday Afternoon |
Snow Level 600' (Easterly Flow *) |
| Mt. Hood | Elevation |
|---|---|
| Tuesday Evening |
Freezing Level 6000' (Easterly Flow *) |
| Tuesday Night |
Freezing Level 3500' |
| Wednesday Morning |
Freezing Level 3500' |
| Wednesday Afternoon |
Freezing Level 4500' |
| Wednesday Evening |
Snow Level 5000' |
| Wednesday Night |
Snow Level 4500' |
| Thursday Morning |
Snow Level 4500' |
| Thursday Afternoon |
Snow Level 5500' (Easterly Flow *) |
* Easterly flow in the Cascade Passes can cause locally lower Snow or Freezing levels than areas further west.
Freezing Level is when no precipitation is forecast.
Precipitation Forecast
| Tuesday Night | Monday | Monday Night | Monday | |
|---|---|---|---|---|
| 4 pm - 4 am | 4 am - 4 pm | 4 pm - 4 am | 4 am - 4 pm | |
| Hurricane Ridge | 0 | 0 | 0 | 0 |
| Mt Baker Ski Area | 0 | 0 | 0 | 0 |
| Washington Pass | 0 | 0 | 0 | 0 |
| Leavenworth | 0 | 0 | 0 | 0 |
| Stevens Pass | 0 | 0 | 0 | 0 |
| Snoqualmie Pass | 0 | 0 | 0 | 0 |
| Mission Ridge | 0 | 0 | 0 | 0 |
| Crystal Mt | 0 | 0 | 0 | 0 |
| Paradise | 0 | 0 | 0 | 0 |
| White Pass | 0 | 0 | 0 | 0 |
| Mt Hood Meadows | 0 | 0 | 0 | 0 |
| Timberline | 0 | 0 | 0 | 0 |
| Hurricane Ridge | Precipitation Forecast |
|---|---|
| Tuesday Night | 0 |
| Monday | 0 |
| Monday Night | 0 |
| Monday | 0 |
| Mt Baker Ski Area | Precipitation Forecast |
|---|---|
| Tuesday Night | 0 |
| Monday | 0 |
| Monday Night | 0 |
| Monday | 0 |
| Washington Pass | Precipitation Forecast |
|---|---|
| Tuesday Night | 0 |
| Monday | 0 |
| Monday Night | 0 |
| Monday | 0 |
| Leavenworth | Precipitation Forecast |
|---|---|
| Tuesday Night | 0 |
| Monday | 0 |
| Monday Night | 0 |
| Monday | 0 |
| Stevens Pass | Precipitation Forecast |
|---|---|
| Tuesday Night | 0 |
| Monday | 0 |
| Monday Night | 0 |
| Monday | 0 |
| Snoqualmie Pass | Precipitation Forecast |
|---|---|
| Tuesday Night | 0 |
| Monday | 0 |
| Monday Night | 0 |
| Monday | 0 |
| Mission Ridge | Precipitation Forecast |
|---|---|
| Tuesday Night | 0 |
| Monday | 0 |
| Monday Night | 0 |
| Monday | 0 |
| Crystal Mt | Precipitation Forecast |
|---|---|
| Tuesday Night | 0 |
| Monday | 0 |
| Monday Night | 0 |
| Monday | 0 |
| Paradise | Precipitation Forecast |
|---|---|
| Tuesday Night | 0 |
| Monday | 0 |
| Monday Night | 0 |
| Monday | 0 |
| White Pass | Precipitation Forecast |
|---|---|
| Tuesday Night | 0 |
| Monday | 0 |
| Monday Night | 0 |
| Monday | 0 |
| Mt Hood Meadows | Precipitation Forecast |
|---|---|
| Tuesday Night | 0 |
| Monday | 0 |
| Monday Night | 0 |
| Monday | 0 |
| Timberline | Precipitation Forecast |
|---|---|
| Tuesday Night | 0 |
| Monday | 0 |
| Monday Night | 0 |
| Monday | 0 |
LT = less than; WE or Water equivalent is the liquid water equivalent of melted snow in hundredths of inches. As a rough approximation 1 inch of snow = about .10 inches WE, or 10 inches of snow = about 1 inch WE.
Issued: 2:13 PM PDT Tuesday, March 17, 2020
Free Winds at 5000' (mph)
| Hurricane Ridge | Mt. Baker | Stevens to Snoqualmie Pass | Mt. Rainier | Mt. Hood | |
|---|---|---|---|---|---|
| Tuesday Evening | E 0 - 10 | ENE 0 - 10 | E 0 - 10 | VAR 0 - 10 | VAR 0 - 10 |
| Tuesday Night | VAR 0 - 10 | ENE 0 - 10 | E 0 - 10 | VAR 0 - 10 | NE 0 - 10 |
| Wednesday Morning | NE 0 - 10 | VAR 0 - 10 | W 0 - 10 | VAR 0 - 10 | E 0 - 10 |
| Wednesday Afternoon | VAR 0 - 10 | VAR 0 - 10 | W 0 - 10 | W 0 - 10 | ENE 0 - 10 |
| Hurricane Ridge | Elevation |
|---|---|
| Tuesday Evening | E 0 - 10 |
| Tuesday Night | VAR 0 - 10 |
| Wednesday Morning | NE 0 - 10 |
| Wednesday Afternoon | VAR 0 - 10 |
| Mt. Baker | Elevation |
|---|---|
| Tuesday Evening | ENE 0 - 10 |
| Tuesday Night | ENE 0 - 10 |
| Wednesday Morning | VAR 0 - 10 |
| Wednesday Afternoon | VAR 0 - 10 |
| Stevens and Snoqualmie Pass | Elevation |
|---|---|
| Tuesday Evening | E 0 - 10 |
| Tuesday Night | E 0 - 10 |
| Wednesday Morning | W 0 - 10 |
| Wednesday Afternoon | W 0 - 10 |
| Mt. Rainier | Elevation |
|---|---|
| Tuesday Evening | VAR 0 - 10 |
| Tuesday Night | VAR 0 - 10 |
| Wednesday Morning | VAR 0 - 10 |
| Wednesday Afternoon | W 0 - 10 |
| Mt. Hood | Elevation |
|---|---|
| Tuesday Evening | VAR 0 - 10 |
| Tuesday Night | NE 0 - 10 |
| Wednesday Morning | E 0 - 10 |
| Wednesday Afternoon | ENE 0 - 10 |
| Hurricane Ridge | Direction - Speed |
|---|---|
| Tuesday Evening | E 0 - 10 |
| Tuesday Night | VAR 0 - 10 |
| Wednesday Morning | NE 0 - 10 |
| Wednesday Afternoon | VAR 0 - 10 |
| Mt. Baker | Direction - Speed |
|---|---|
| Tuesday Evening | ENE 0 - 10 |
| Tuesday Night | ENE 0 - 10 |
| Wednesday Morning | VAR 0 - 10 |
| Wednesday Afternoon | VAR 0 - 10 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Tuesday Evening | E 0 - 10 |
| Tuesday Night | E 0 - 10 |
| Wednesday Morning | W 0 - 10 |
| Wednesday Afternoon | W 0 - 10 |
| Mt. Rainier | Direction - Speed |
|---|---|
| Tuesday Evening | VAR 0 - 10 |
| Tuesday Night | VAR 0 - 10 |
| Wednesday Morning | VAR 0 - 10 |
| Wednesday Afternoon | W 0 - 10 |
| Mt. Hood | Direction - Speed |
|---|---|
| Tuesday Evening | VAR 0 - 10 |
| Tuesday Night | NE 0 - 10 |
| Wednesday Morning | E 0 - 10 |
| Wednesday Afternoon | ENE 0 - 10 |
Directions above indicate the direction the wind blows from on the 16-point cardinal scale. These winds indicate "free" winds, or those winds in the atmosphere not influenced by terrain. Topographical effects may produce greater or lower wind speeds in certain locations as well as significant variations in direction.
Free Winds at 9000' (mph)
| Mt. Baker | Washington Pass | Stevens to Snoqualmie Pass | Mt. Rainier | Mt. Hood | |
|---|---|---|---|---|---|
| Tuesday Evening | ENE 0 - 10 | E 0 - 10 | ESE 0 - 10 | E 0 - 10 | NE 5 - 15 |
| Tuesday Night | N 5 - 15 | VAR 0 - 10 | VAR 0 - 10 | ENE 0 - 10 | ENE 10 - 20 |
| Wednesday Morning | NNW 5 - 15 | NNW 5 - 15 | NNW 5 - 15 | NNE 5 - 15 | ENE 10 - 20 |
| Wednesday Afternoon | NNW 5 - 15 | NW 5 - 15 | NNW 5 - 15 | N 5 - 15 | ENE 10 - 20 |
| Mt. Baker | Direction - Speed |
|---|---|
| Tuesday Evening | ENE 0 - 10 |
| Tuesday Night | N 5 - 15 |
| Wednesday Morning | NNW 5 - 15 |
| Wednesday Afternoon | NNW 5 - 15 |
| Washington Pass | Direction - Speed |
|---|---|
| Tuesday Evening | E 0 - 10 |
| Tuesday Night | VAR 0 - 10 |
| Wednesday Morning | NNW 5 - 15 |
| Wednesday Afternoon | NW 5 - 15 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Tuesday Evening | ESE 0 - 10 |
| Tuesday Night | VAR 0 - 10 |
| Wednesday Morning | NNW 5 - 15 |
| Wednesday Afternoon | NNW 5 - 15 |
| Mt. Rainier | Direction - Speed |
|---|---|
| Tuesday Evening | E 0 - 10 |
| Tuesday Night | ENE 0 - 10 |
| Wednesday Morning | NNE 5 - 15 |
| Wednesday Afternoon | N 5 - 15 |
| Mt. Hood | Direction - Speed |
|---|---|
| Tuesday Evening | NE 5 - 15 |
| Tuesday Night | ENE 10 - 20 |
| Wednesday Morning | ENE 10 - 20 |
| Wednesday Afternoon | ENE 10 - 20 |
Directions above indicate the direction the wind blows from on the 16-point cardinal scale. These winds indicate "free" winds, or those winds in the atmosphere not influenced by terrain. Topographical effects may produce greater or lower wind speeds in certain locations as well as significant variations in direction.
Issued: 2:13 PM PDT Tuesday, March 17, 2020
Extended Weather Synopsis for Monday night through Monday
High pressure with clear skies and calm winds aloft dominates Thursday night as we sit between an offshore low and the Canadian jetstream. A weak disturbance drops southward on Friday, bringing Washington State some cloud cover and very light rain/snow showers or weak convergence activity which lingers on NW flow as a trough digs to our east. Freezing levels continue to hold relatively steady Thursday night through Friday night, in the 4000-6000 ft, with slight cooling on Saturday.
Extended Snow/Freezing Levels
| Mt. Baker | Snoqualmie Pass | Mt. Hood | Easterly Flow * | ||
|---|---|---|---|---|---|
| Thursday Night | Snow Level | 5000' - 6000' | 5000' - 6000' | 5000' - 6000' | * |
| Friday | Snow Level | 4500' - 5500' | 5000' - 6000' | 5500' - 6500' | |
| Friday Night | Snow Level | 4000' - 5500' | 5000' - 6000' | 6000' - 7000' | |
| Saturday | Snow Level | 3500' - 4500' | 4000' - 5000' | 4000' - 5000' |
| Mt. Baker | Elevation |
|---|---|
| Thursday Night |
Snow Level 5000' - 6000' (Easterly Flow *) |
| Friday |
Snow Level 4500' - 5500' |
| Friday Night |
Snow Level 4000' - 5500' |
| Saturday |
Snow Level 3500' - 4500' |
| Snoqualmie Pass | Elevation |
|---|---|
| Thursday Night |
Snow Level 5000' - 6000' (Easterly Flow *) |
| Friday |
Snow Level 5000' - 6000' |
| Friday Night |
Snow Level 5000' - 6000' |
| Saturday |
Snow Level 4000' - 5000' |
| Mt. Hood | Elevation |
|---|---|
| Thursday Night |
Snow Level 5000' - 6000' (Easterly Flow *) |
| Friday |
Snow Level 5500' - 6500' |
| Friday Night |
Snow Level 6000' - 7000' |
| Saturday |
Snow Level 4000' - 5000' |
* Easterly flow in the Cascade Passes can cause locally lower Snow or Freezing levels than areas further west.
Freezing Level is when no precipitation is forecast.
Jump to: Weather Forecast I Snow/Freezing Level I Precipitation I Free Winds 5k I Free Winds 9k I Extended Weather
Previous forecast from Mar 17, 2020
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