Start Time Tuesday---8am

8:00 start monday

Start Time Sunday---8am

MOUNTAIN WEATHER FORECAST

Time and Day: 1100 Saturday

 

The Snapshot: Snow showers will persist for the rest of the weekend.  Next week will start out dry with some sun.

 

The Science:  The atmosphere will remain unstable under strengthening westerly flow for the rest of the weekend.  The low pressure system tracking south along the coast will create easterly/offshore flow on Monday.  This will push moisture away from the PNW at the start of the new week.  

 

4-7day Long Range:  The first half of next week will be mostly dry with sunshine.  The rain/snow game returns at the end of next week.

 

Precipitation: 16hr Water by 4am tomorrow  = .25-.5   Snow = 3-5 24hr water by noon tomorrow = .5  Snow = 5   Trend and Timing: Snow showers will continue through tomorrow.  With temperatures close to freezing and good daytime warming, snow accumulation will be slow.

Base Temp and Freezing levels:  Low: 30  High: 36 Freezing level: +- 4000’   Trends and Timing Freezing will fluctuate between 3500’ and 4500’ through Monday morning.

Winds (mph) Base: 5-10 W Ridge Top: 5-15 W   Trend and Timing: Westerly flow will strengthen today with gusty ridge top winds likely through the night.

Start Time Saturday---8am

MOUNTAIN WEATHER FORECAST

Time and Day: 0900 Friday

 

The Snapshot:  Snow turning to rain today.  Mixed rain and snow can be anticipated through the weekend.

 

The Science:  A strong warm front with a trailing cold front will pass over the mountains today.  Freezing levels will rise to above 5000’ in a few hours.  The trailing cold front is expected to move through later this evening which will turn the precipitation to showers and lower freezing levels to 4000’.  Mixed rain and snow showers will persist in the mountains through the weekend.  Cooler air is expected on Sunday with snow showers continuing.     

 

4-7day Long Range:   There will be a break in the precipitation Monday through Wednesday with more of the snow/rain mix during the second half of the week.

 

Precipitation: 16hr Water by 4am tomorrow  = .25-.5  Snow = 0-3 24hr water by noon tomorrow = .5+   Snow = 0-4   Trend and Timing: Snow will change to rain today.  Intermittent mixed snow and rain will continue through tomorrow.

Base Temp and Freezing levels:  Low: 30  High: 38 Freezing level: 4000’    5500’   Trends and Timing Freezing levels rise to 5500’ this afternoon and then fall back to 4000’ tomorrow.

Winds (mph) Base: 0-5 E shifting SW Ridge Top: 0-10 E shifting SW   Trend and Timing: Winds will shift southwest with the passing of the front later today.

MOUNTAIN WEATHER FORECAST

Time and Day:  0830 Thursday

 

The Snapshot:  Today will be mostly dry with light scattered rain/snow showers likely; snow changing to rain tomorrow.

 

The Science:  A strong warm front is expected to reach the mountains early tomorrow morning. This will bring rising freezing levels and moderate to heavy snow changing to rain through the day tomorrow.    

 

4-7day Long Range:   Mixed snow and rain will continues through the weekend.   Next week will start out dry with some clearing.   More wet and warm systems are positioned to hit the PNW on Wednesday/Thursday.   

 

Precipitation: 16hr Water by 4am tomorrow  =<.25   Snow = trace 24hr water by noon tomorrow = .5  Snow = 1-3   Trend and Timing: Light snow showers with sun breaks today.  Snow will begin early tomorrow morning and change to rain by noon or so.

Base Temp and Freezing levels:  Low: 26  High: 34 Freezing level: 4000’   5500’   Trends and Timing Freezing levels will hover around 4000’ through the night and then rise to 5500’ with the passing of the front tomorrow.

Winds (mph) Base: 0-5 W Ridge Top: 5-10 WSW   Trend and Timing:  Light westerly flow today shifting back to easterly tomorrow.

Start Time Friday---8am

MOUNTAIN WEATHER FORECAST

Time and Day: 1200 Wednesday

 

The Snapshot:   The snow is starting to corn up nicely today.   Another round of rain and snow will enter the mountains this evening with light scattered showers and sun breaks tomorrow.  It seems like we will be stuck with this on-off, snow- rain pattern for the next 4-7 days.

 

The Science:  The low pressure system parked off the coast will continue to swing bands of precipitation into the Cascades through the weekend.  Freezing levels will bounce between 4000’ and 5000’ through this series of weak fronts.  Therefore, rain and snow can be expected to continue into the coming weekend.   

 

4-7day Long Range:  Starting Friday, the weather will trend wetter as more moisture gets entrained from the SW.   Next week will start out dry with more systems moving through on Tuesday.

 

Precipitation: 16hr Water by 4am tomorrow  = .5   Snow = 3-5 24hr water by noon tomorrow = .5  Snow = 3-6   Trend and Timing: Light precipitation should begin to fall after closing today.  Mixed rain and snow will increase overnight and then rapidly diminish by morning. Higher accumulations can be expected on the upper ridges.

Base Temp and Freezing levels:  Low: 26   High: 40 Freezing level: +- 4000’   Trends and Timing Surface temperatures will touch 40f today with the aid of the sun.  Freezing levels will hover around 4000’ through tomorrow.

Winds (mph) Base: 0-5 E Ridge Top: 0-10 E   Trend and Timing: Light east flow develops today. Winds will shift westerly tomorrow but remain light.

8:00 start thursday

MOUNTAIN WEATHER FORECAST

Time and Day: Tuesday 1000

The Snapshot:  Periods of light rain and snow will be on the weather menu for the next few days. 

 

The Science:   The weakening low pressure system spinning off the NW coast will produce light snow and rain showers in the mountains for remainder of the week – a fairly typical spring pattern.   Weak high pressure ridges will form between the bands for dry periods and possible sun breaks.      

 

4-7day Long Range:  This pattern will likely continue into theweekend.

 

Precipitation: 16hr Water by 4am tomorrow  =.25   Snow = 0-3 24hr water by noon tomorrow = .25   Snow = 0-3   Trend and Timing: Light rain and snow showers will continue through tomorrow.

Base Temp and Freezing levels:  Low: 26  High: 36 Freezing level: 5000’   4000’   Trends and Timing Freezing levels will fall to just below 4000’ tonight.   Daytime temperatures will recover to the lower to mid 30’s.

Winds (mph) Base: 0-5 WSW Ridge Top:5-10 W   Trend and Timing: Winds will flip flop between W and E as these bands of moisture come and go.

 

 

 

8:00 start wednesday

8:00 start time tuesday

MOUNTAIN WEATHER FORECAST

Time and Day: 0900 Monday

 

The Snapshot:  Today will be dry and warm.  A series of wet systems will begin to batter the PNW starting tomorrow.  Next week will be stormy with rain and snow.   

 

The Science:  A strong low pressure system creeping towards the western coast will begin sending a series of systems through the PNW tomorrow. Freezing levels will bounce between 4000’ and 5000’ as these fronts come and go.   Sound familiar?   Therefore, the general layout for the week will be rain tomorrow, snow on Wednesday and Thursday, then back to rain on Friday.     

 

4-7day Long Range: Long range models show this pattern continuing into the weekend.  If this holds true (which is unlikely) snow can be expected on Saturday.  

 

Precipitation: 16hr Water by 4am tomorrow  = 0  Snow = 0 24hr water by noon tomorrow = .25  Snow = 0-2   Trend and Timing: The first wave of moisture is expected to reach the mountain after 4am tomorrow morning. Mixed rain and snow with periods of just rain can be anticipated tomorrow.

Base Temp and Freezing levels:  Low: 30  High: 38 Freezing level: 4000’   5000’  4000’   Trends and Timing Freezing levels will fluctuate between 4k and 5k through tomorrow.

Winds (mph) Base: 0-10 E Ridge Top: 5-15 E shifting SW   Trend and Timing: The current east flow will strengthen this afternoon and then shift WSW overnight.   WSW flow with gusty ridge top winds will be expected during the early morning hours and diminishing by afternoon.

Start Time Monday---8am

Start Time Sunday---8am

MOUNTAIN WEATHER FORECAST

Time and Day: 0900 Saturday

 

The Snapshot:  Nice alpenglow on the mountains this morning, don’t-ya think?   Clouds will move in later today with a chance of some light snow tonight.  The sun returns tomorrow for a few days of spring like weather.

 

The Science: A weak system tracking across the northern portion of the state will drop some light snow on Stevens Pass tonight.  The high pressure ridge reforms tomorrow for a few days of dry and warmer weather.  

 

4-7day Long Range:  A large low pressure system developing offshore will begin to send wet systems into the region starting on Tuesday.  The rest of the week will be active with a chance of rain and snow throughout.

 

Precipitation: 16hr Water by 4am tomorrow  = < .25  Snow = 1-3 24hr water by noon tomorrow = .25   Snow = 1-3   Trend and Timing: Light snow will begin to fall late tonight and then taper off early tomorrow morning.  Tomorrow will be mostly dry.

Base Temp and Freezing levels:  Low: 24   High: 32 Freezing level: +- 4000’   Trends and Timing Today and tomorrow, freezing levels will rise to 4000’ during the day and then fall back to around 3000’ at night.   The sun may push surface temperatures above freezing during the day.

Winds (mph) Base: 0-5  ESE Ridge Top: 0-10 S   Trend and Timing: Winds will shift from E to S to W through the next 24hrs.   East flow develops on Monday.

Start Time Saturday---8am

MOUNTAIN WEATHER FORECAST

Time and Day: 0900 Friday

 

The Snapshot: Sunny and cool today.  Cloudy with a chance of some light snow can be anticipated tomorrow afternoon/evening.

 

The Science:  High pressure has produced a beautiful morning here in the Cascade Mountains.   The pressure ridge is expected to flatten and shift south tomorrow.  This will open the door for a weak disturbance to pass through the region late tomorrow afternoon.  Warm and dry southerly flow moves in on Sunday.    

 

4-7day Long Range:  Next week will start out dry and warm with rain and or snow during the middle of the week.

 

Precipitation: 16hr Water by 4am tomorrow  = 0   Snow = 0 24hr water by noon tomorrow =  0  Snow = 0   Trend and Timing: Dry through the night with snow expected tomorrow afternoon.

Base Temp and Freezing levels:  Low: 18  High: 26 Freezing level: +- 3500   Trends and Timing Freezing levels will remain below 4000’ through the weekend.  The sun could allow surface temperatures to climb to near freezing during the peak of the day.    An overall warming trend begins tomorrow night.

Winds (mph) Base: 0-5 ENE Ridge Top: 0-10 ENE   Trend and Timing: Light easterly breezes will continue through tomorrow.