March 24, 2017

8:00 Start Saturday March 25, No ABS


MOUNTAIN WEATHER FORECAST

Time and Day: 0700 Friday

The Snapshot:   It’s 320f  and snowing this morning with 3” of new snow.   Mixed rain and snow is expected today with a short dose of moderate snow tonight.  Passing snow showers with sun breaks can be anticipated for the weekend.    

The Science:  A nice batch of moisture ahead of the approaching cold/occluded front is currently in the mountains.  A bit of rain below 4500’ will be added to the mix once the day begins to warms up. Radar has the back boundary of the moisture just east of the Olympics with the front still offshore.   

The front is timing out to pass east of the Cascade Crest early tonight with good westerly flow and lowering freezing levels filling in.  Hopefully, we will get a few inches of new snow to report on tomorrow morning.  A weak high pressure ridge between systems will produce clear periods but also keep the chance of snow showers possible into early Sunday morning.

The Long Range:   The weather for the first full week of spring will continue to be active with the snow/rain game continuing throughout.  There are signs of a pattern change late next week with high pressure developing off of the Oregon/California coast – this could be the start of a prolonged drying trend for the PNW, or not.   

24hr Precipitation ending at 4am:
Today 24hr water = .5-.75 snow = 3-5
Tomorrow’s 24hr water = .25-.5 snow = 2-5

Trend and Timing:
Snow this morning shifting to mixed rain and snow through the day.  The precipitation diminishes to light showers tomorrow.


24hr temperature ending at 4 am: 
Low:  28   High: 38
Freezing level: 4500’ – 3500’

Trend and Timing:   
Freezing levels will peak near 4500’ this afternoon and then begin to fall tonight.

 
24hr Winds (mph) ending at 4 am:
Base: 0-5 ESE
Ridge Top: 5-10 SE

Trend and Timing:
Light easterly winds shift southerly then westerly over the next 24hrs.



jM

March 23, 2017

8:00 Start Friday March 24, No ABS


MOUNTAIN WEATHER FORECAST

Time and Day: 0700 Thursday

The Snapshot:   Partly cloudy this morning with a brand new inch of snow to play on.   Today will be mostly dry with some sun breaks, more moisture is on the way.

The Science:   A weak ridge of high pressure has produced a rather peaceful morning in the mountains.  The next weather feature to pull our attention is a triple point frontal system making its way in. The leading edge of the warm front is still off the Oregon coast and is expected to reach the Central Cascades tonight.  This system is not packing a ton of energy and is expected to weaken when it hits the mountains.

You know the drill, warm southerly flow with mixed rain and snow, followed by a cold front, lowering freezing levels and then taper off the snow.  Being it is spring, early morning temperatures will be near freezing with good daytime warming - snow levels bounce between 3500’ and 5000’.

The Long Range:   Snow showers persist into Saturday with more of the same weather starting on Sunday.  The fronts keep right on coming through most of next week.

24hr Precipitation ending at 4am:
Today 24hr water = .25  snow = 1-2
Tomorrow’s 24hr water = .5  snow = 2-4

Trend and Timing:
Light mixed rain and snow develops tonight and continues into Saturday morning.


24hr temperature ending at 4 am: 
Low: 26    High: 36
Freezing level: +-4500’

Trend and Timing:   
Freezing levels will hover around 4500’ with typical daytime warming.  It is spring after all. 

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

Trend and Timing:
The strong westerly winds that blew last night will diminish and shift southerly today.



jM

March 22, 2017

8:00 start Thur March 23rd no ABS

MOUNTAIN WEATHER FORECAST

Time and Day:  0630 Wednesday

The Snapshot:  Snow showers today, dry tomorrow, more mixed rain and snow heading into the weekend.

The Science:  Showers out ahead of an approaching cold front will move through the mountains today.  Cooler westerly flow will fill in behind the front, lowering freezing levels and providing some moderate snow showers through the night.  A weak high pressure ridge will break up the moisture tomorrow for some drying and clearing. Another frontal system arrives on Friday for more of the same rain vs snow. 

The Long Range:  It seems like we are locked into this pattern of a frontal system followed by a ridge of high pressure every other day or so.  Therefore expect this active weather with freezing levels bouncing above and below 4500’ to continue through the weekend and likely into early next week.    

24hr Precipitation ending at 4am:
Today 24hr water = .5 snow = 3-5
Tomorrow’s 24hr water = .25  snow = 1-2

Trend and Timing:
Passing snow showers will continue today with precipitation tapering off tomorrow.


24hr temperature ending at 4 am: 
Low:  26   High: 34
Freezing level: 4500’ – 3000’ – 4500’

Trend and Timing:   
Freezing levels will fall tonight with daytime warming rebounding temperatures.


 
24hr Winds (mph) ending at 4am:
Base: 0-5 E shifting W
Ridge Top: 5-10 W gusty

Trend and Timing:
East flow this morning will shift westerly this afternoon. 



jM