January 23, 2017

8:00 start tue jan 24th no abs

MOUNTAIN WEATHER FORECAST

Time and Day: 0630 Monday

The Snapshot:  The proverbial January thaw is upon us.   Long term clear and dry weather begins today.   Enjoy the sunshine and the stars.

The Science: The low-pressure system that brought us the dusting of snow yesterday will be replaced by a blocking ridge of high pressure today.  This high pressure system is expected to strengthen through the week. Therefore, expect clear and dry weather to prevail over the Central Cascades for the next + 5 days.  Cold clear mornings with nice daytime warming will be the temperature profile through the week as well.

The Long Range:  The dry weather pattern will likely persist into the upcoming weekend. 

Precipitation Ending at 4am:

Today 24hr water = 0 Snow = 0

Tomorrow’s 24hr water = 0 snow = 0

Trend and Timing:
0

24hr temperature ending at 4 am tomorrow: 
Low: 16   High: 26
Freezing level: +-2500’

Trend and Timing:   
10-15 degree temperature spreads with lows in the upper teens and highs pushing into the upper 20’s or even low 30’s will develop over the next few days.

 
24hr Winds (mph) ending at 4 am tomorrow:
Base:  0-5 W
Ridge Top: 0-10 NW

Trend and Timing:
Winds will be light and mostly westerly for the week.




jM

January 22, 2017

8:00 Start Monday January 23, No ABS


Mountain Weather Forecast

Time and Day: 0700 Sunday

The Snapshot: More light snow showers today, clearing skies tonight and tomorrow.

The Science: The trend of light snow showers and partly cloudy skies will continue today. A weak occluded front will cross Stevens Pass today bringing another minor refresh of snow. The low pressure system off the coast that has been spinning these bands of snow into the Northwest will begin to move onshore at the Oregon/California border Sunday afternoon night, leaving Washington under clearing skies and cool northern upper level flow. High pressure will build over the West Coast Monday afternoon and Tuesday bringing mostly sunny and dry days with freezing levels around 2,000’.

The Long Range: A high amplitude high pressure ridge will build over the West Coast for most of next week. A very weak low pressure trough may try to move through on Wednesday night/Thursday, with the main effect being increasing clouds, before the ridge rebuilds for the remainder of the week.


Precipitation Ending at 4am:

Today 24hr water = >.25 Snow = 1-3

Tomorrow’s 24hr water = 0 Snow = 0

Trend and Timing:
Light snow during the day Sunday, ending Sunday afternoon. Dry Monday night.

24hr temperature ending at 4 am tomorrow: 
                                     
Low:   25  High: 30
Freezing level: 2500-3000

Trend and Timing:   
Temperatures will bump up during the day Sunday, and drop under clearing skies Sunday night and Monday.
 
24hr Winds (mph) ending at 4 am tomorrow:
Base: E 10-15
Ridge Top: E 5-10

Trend and Timing:
Gusty east winds through the Pass today, light east winds at the ridgetops diminishing Sunday night.

 DV

January 21, 2017

8:00 am start sun jan 22nd no ABS

MOUNTAIN WEATHER FORECAST

Time and Day:  0730 Saturday

The Snapshot:  Lightly snowing with 1” of fresh snow this morning.  We can look forward to intermittent snow showers and sun breaks for the remainder of the weekend.  Dry and clear weather begins on Monday.

The Science:  Satellite imagery has scattered snow showers rotating around an offshore stationary low.  Bands of moisture will continue to move north as the low-pressure cell slowly drifts southeast into Oregon over the next few days. The bulk of the moistures is expected to remain along the eastern slopes with more accumulation east of the Cascade Crest possible. 

Freezing levels to the east have settled around 2500’ with 3500’over the western slopes; this will continue to produce east-west pressure gradients and thus, periods of gusty easterly winds.   

The Long Range:   Dry and clear weather develops on Monday as high pressure strengthens over the PNW.   The blocking ridge of high pressure is expected to dominate the weather pattern for all of next week.

Precipitation Ending at 4am:

Today 24hr water =  .25 Snow = 2-4

Tomorrow’s 24hr water = .25  snow = 2-4

Trend and Timing:
Passing snow showers will continue through early Monday morning.


24hr temperature ending at 4 am tomorrow: 
Low: 24    High: 32
Freezing level: +-2500’

Trend and Timing:   
Temps will be consistent with normal daytime warming.

 
24hr Winds (mph) ending at 4 am tomorrow:
Base: 5-10 E
Ridge Top: 5-15 E

Trend and Timing:
Periods of gusty easterly winds will continue today and tomorrow. 




jM