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MOUNTAIN WEATHER FORECAST

Time and Day:  0700 Monday
The Snapshot:  Mixed rain and snow this morning with a short dry period tonight.  Heavy snow changing to rain tomorrow.   
The Science
Current Observations: 1.36” of water that equated to around  5” of snow, fell overnight, the temperature is 32f, the barometer is 1001mb and falling, ridge top winds are 5-10mph out of the WSW.  Radar shows the back edge of this system just entering the Olympic Range with mixed rain and snow falling at the Passes.  
A cold front will swing through today which will keep the moisture falling and usher in some cooler air. Westerly flow will fill in behind the front which could enhance snowfall for a few hours this afternoon.  Tonight will be cool and dry with some partial clearing under a weak high pressure ridge.
The Thanksgiving Storm:  As advertised, a strong, warm SW fetch of moisture enters the region tomorrow for a Pineapple Express event.  ** East flow development could (or not) allow the start of this storm to be heavy snow …

8:00 Start No ABS Monday November 20

MOUNTAIN WEATHER FORECAST

Time and Day: 0700 Sunday
The Snapshot:   Partly cloudy today with stormy conditions developing this afternoon. Moderate to heavy rain and snow overnight and clearing Monday.
The Science: The frontal boundary for the next round of weather is rapidly approaching the coast this morning. Clouds will increase throughout the day with precipitation starting after noon. Freezing levels will rise above pass level as the front approaches, providing a period of potentially “mixed precip” Sunday afternoon. A relatively cooler air mass follows the front, bringing freezing levels back down after midnight and Monday morning. The event should end with snow all the way to the base area at Stevens Pass. The atmosphere quickly dries out Monday morning, with brief ridging in advance of the Big Event. Monday should be mostly dry, partly cloudy, and benign.
The Long Range:    A classic southerly flow atmospheric river event is setting up for the Tuesday through Thursday period. This has been well advertise…

8:00 start sun nov 19th no ABS

MOUNTAIN WEATHER FORECAST

Time and Day: 0630 Saturday
The Snapshot:  Mostly dry and a touch warmer today, heavy snow with mixed rain expected tomorrow with the holiday week shaping up to mild and rainy.   
The Science
Current Observations:  3” of snow fell overnight, the temperature is 300f , the Rh is 94%, and the barometer is holding steady at 1020mb’s, the wind is 5-10mph and out of the west.  Mr. Radar shows mostly dry weather over the mountains with a few isolated showers out along the coast. 
The patchy clouds and some clearing around the region is an indicator of the high pressure ridge popping up to the south.  Thus, the next 24hrs will be mostly dry.
The next frontal system arrives tomorrow.  This storms anatomy involves a rise in freezing levels to 5000’ sometime after 7 a.m tomorrow.  Freezing levels will then slowly fall to 4000’ through the day/night.  The precipitation arrives around noon tomorrow with the intensity increasing to heavy mixed rain and snow through the afternoon. 
Storm totals from 4am…

8:00 am start sat Nov 18th no ABS

MOUNTAIN WEATHER FORECAST

Time and Day:  0630 Friday
The Snapshot:  Windy with persistent snow showers today, dry tomorrow, heavy snow on Sunday.  Warming next week.    
The Science
Current Observations: This morning’s radar has some nice snow showers in the convergence zone, telemetry is reading 7” of new snow with the temperature at 290f , the barometer has bummed up to 1006mb, the winds are blowing 5-10mph and out of the west.
A weak convergence zone with cool unstable WNW flow will keep light to moderate snow falling into tomorrow morning.   
Tomorrow, a high pressure ridge, moving into the inland NW (NE Oregon/Idaho), will begin to push the moisture to the north for a temporary break in the precipitation. 
SUNDAY.  Sunday is looking very interesting with a potential heavy snow event.  A strong warm front, with a good punch of moisture, will enter the Cascade Mountains early Sunday morning.  A cold front, hot on its heels, will swing in with good cool air mixing.   At the moment freezing levels look to peak aro…

MOUNTAIN WEATHER FORECAST

Time and Day: 0800 Thursday 
The Snapshot:  Snow showers will persist into Saturday morning.  
The Science
Current Observations: 5” of new snow is on the ground, the temperature is 30f, the Rh = 94%, the barometer is 999mb and holding steady, the wind is light and out of the SSW.
Cool NW flow will keep snow shower persistent through the end of the week and possibly into Saturday morning.  
The Long Range:  A short dry period will develop on Saturday with heavy snow possibly changing to rain on Sunday.  Long range models have next week to being rainy with high freezing levels.      
24hr Precipitation ending at 4am: Today 24hr water: .25  snow: 2-4 Tomorrow’s 24hr water:.25-.5  snow: 2-5
Trend and Timing: Snow showers will persist today and tomorrow.   A weak convergence zone could enhance some of the shower intensity from time to time.

24hr temperature ending at 4 am:  Low: 26   High: 32 Freezing level: 4000' - 3000'
Trend and Timing:  Temperatures will fall through the day with f…

MOUNTAIN WEATHER FORECAST

Time and Day:  0630 Wednesday
The Snapshot:  Snow tapering to showers this afternoon. Snow shower persists through the end of the week.  Saturday will be dry with some clear periods.  Warmer and wet weather arrives on Sunday/Monday.   
The Science
Current Observations:  2” of snow has hit the ground thus far this morning, the temperature is 31f, the Rh is 100%, the barometer has dropped to 1004mb’s, and the winds are a bit gusty and out of the ESE. 
The approaching cold front is still to the west and is pushing a swath of heavy moisture into the mountains.  The snow will diminish and the temperature will drop a few degrees once the front heads east of the crest later today. 
NW flow with cooler unstable air will keep snow showers moving through the mountains tomorrow and Friday. 
The Long Range:   Saturday will be mostly dry with a warm SW fetch of moisture entering the region on Sunday.  Next week is now looking warm with rain showers likely.    
24hr Precipitation ending at 4am: Today 24…

MOUNTAIN WEATHER FORECAST

Time and Day:  0630  Tuesday
The Snapshot: Lights snow showers today with moderate to heavy snow again tonight. Intermittent snow showers continue through the end of the week.   
The Science
Current Observations: +- 10” of snow fell overnight, the temperature is 31f, the Rh = 93%,  the barometer is 1013mb and rising, the winds are out of the west and gusting between 10-15mph.  The snow has pretty much stopped with just some light showers showing up on the radar.   
A weak ridge of high pressure between systems has created a lull in the action this morning with some partial clearing.  The next frontal system is expected to reach the mountains later today with moderate to heavy snow tonight and tomorrow morning.   The atmosphere will remain unstable allowing isolated snow showers to continue through Friday.   
The Long Range:  Saturday will be mostly dry with more precipitation and warmer temperatures arriving on Sunday.     
24hr Precipitation ending at 4am: Today 24hr water: .75+ snow: 6-10…