Time and Day: 0700
Tuesday
The Snapshot: Let the games begin. 360 on the
upper mountain and 160 in the base area with overcast skies. A complicated storm with several embedded fronts will begin to affect the PNW
today.
The Science: The first batch of precipitation leading the
charge is currently entering the western slopes of the Cascades. Freezing levels over Western Washington are 7-9000’ with cold easterly flow mixing
at the Passes. This means the moisture is starting out as
rain and freezing as it falls into the cold air and onto frozen surfaces. Yuk.
The leading edge
of the stronger warm front is still offshore and is expected to make landfall
later today. Once this front enters the mountains, the freezing levels over
Stevens Pass will bump up to +-6000’ and the precipitation
(rain) will increase. Moderate to heavy
rain is expected after 4 pm today with
the rain shifting to intermittent showers tomorrow. Cool unstable flow fills in on Thursday with snow showers persisting for the
remainder of the week.
The Long Range: Active, snowy weather
continues through the weekend as a
low-pressure trough moves into place.
|
Precipitation
Ending at 4 am:
Today 24hr water = 1-1.5
Snow = 1-4
Tomorrow’s 24hr water
= .75 snow = 1-3
Trend and Timing:
Mixed rain and snow
and freezing rain changing to rain tonight, rain
showers tomorrow.
|
|
|
|
24hr temperature ending at 4 am tomorrow:
Low: 30 High:
40
Freezing level: +-5000’
Trend and Timing:
Freezing levels will
rise today and peak around 6000’
tomorrow.
|
|
|
|
24hr Winds (mph) ending at 4 am tomorrow:
Base: 0-5 E
Ridge Top: 5-10 SSW
Trend and Timing:
Southerly flow aloft with east flow at the surface will change westerly over the next 24-36hrs.
|
jM
No comments:
Post a Comment