Time and Day: 0700
Thursday
The Snapshot: Cold and breezy today with snow developing
tonight. Winter storm action begins
tomorrow and continues through the
weekend.
Warning: Wind chill temperatures will feel like -10o
to -15o today.
The Science: The winter storm(s) developing off the PNW coast
will spin the first band of moisture into the mountains tonight. Stiff, cold east winds will strengthen today
with snow arriving after sunset. The associated low-pressure
cell is expected to stall a bit offshore before it makes it push tomorrow.
Therefore, snow will be moderate to light and then intensify tomorrow night
into Saturday morning. The flow pattern will remain easterly through most of tomorrow
with warm air advection slowly eroding the cold air along the eastern slopes. Once
the flow shifts SW late tomorrow night or early Saturday morning the freezing
levels will rise to 3000’ or 3500’ along with heavy snow. The timing for all this is tricky, but expect
the heaviest period of snow late Friday night into Saturday.
Storm totals from
4pm today through 4am Sunday = 1-2” water, 12-24” of snow. New storm totals will be calculated later
today.
Long Range: The snow ends on Sunday with another cold, dry
airmass arriving early next week.
|
Precipitation
Ending at 4am:
Today 24hr water = .25
Snow = 2-4
Tomorrow’s 24hr water
= .5-.75 snow = 5-8
Trend and Timing:
Light snow arrives
after sunset today. Snow slowly intensifies
through the day tomorrow.
|
|
|
|
24hr temperature ending at 4 am tomorrow:
Low: 10 High:
16
Freezing level: 500’ -
2000’
Trend and Timing:
Wind chills will be
well below 0 today.
Temperatures will
slowly warm over the next 24-36 hrs.
|
|
|
|
24hr Winds (mph) ending at 4 am tomorrow:
Base: 10-15 E Gusty
Ridge Top: 10-30 E High wind warning.
Trend and Timing:
Easterly winds will strengthen today with +50mph
ridge top winds possible. Winds will
shift SW then W tomorrow evening.
|
jM
No comments:
Post a Comment