0700 Thursday:
The Snapshot: While the mountains remain relatively quiet, our friends to the
west are cleaning up and restoring power after one of the strongest storms of
the year – and another one on the way. A
special note of interest; yesterday was the warmest December day on record at
Sea-tac. Rain showers with mix snow above 4500’ today,
a drying trend begins tomorrow.
The Science: A strong low-pressure cell will track north along
the coast today bringing another round of heavy precipitation and wind to Western
Washington. This system will spare the Cascades
again as it skirts along the western edge of the state. Cooler air aloft will mix with this system
and drop freezing levels to around 4500’ – so expect some white stuff on the
upper mountain today with mostly rain at Pass level. High-pressure begins to build tomorrow turning
the weather cool and dry for the weekend.
4-7day
Long Range: The Cascade Mountains will
remain mostly dry through the first part of next week. Some storms are beginning to develop starting
on Wednesday; this has potential to bring some snow by the end of the week.
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Precipitation ending at 4am:
Today’s 24hr Water
= .25 Snow = 1-2”
Tomorrow’s 24hr Water= .10 Snow = trace
Trend and Timing:
Intermittent showers will continue through the
night. A drying trend begins after 7am
tomorrow morning.
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24hr temperature ending at 4am tomorrow:
Low: 32 High:
40
Freezing level: +-5000
Freezing Level Trends and Timing
Freezing levels will slowly fall to 5000’ today
and then continue to descend to 4000’ tomorrow.
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24hr Winds (mph) ending at 4am tomorrow:
Base: 5-10
ESE
Ridge Top: 5-15 ESE
Trend and Timing:
Some gusty ridge top winds (easterly) will be possible
as this storm passes to the west. Winds shift westerly tomorrow.
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JM
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