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US Extended Snowfall Outlook
Updated April 10, 2017 (OLD)

TAHOE --> Across the western US later Tuesday through later Thursday (afternoon/ evening) it looks like Tahoe is the place to be for new snow, with the best snowfall Wednesday afternoon through Thursday morning, and snow levels starting near 7,000 feet or so, dropping to near 6,000 feet (below all Tahoe area resort base elevations) as strong late season low pressure moves in and through. A good foot of new snow is possible, with 1.5+ feet above 7,000 feet Wednesday afternoon through Thursday morning. Dynamics + moisture make this look like a bigger than 1 foot storm, but we will see... show up on Thursday for the freshies, with lighter snow showers continuing on a colder Thursday. The Cascades of Oregon/ Washington will also see more new snow, as will northern Idaho and northwest Montana. The rest of the west looks mostly dry. CM

LONGER RANGE...
Sunday through next Thursday looks snowy for Tahoe-Mammoth, with the storms that hit the west coast (full strength) weakening as they move inland. Snow is expected for the northern and central Rocky Mountains and northern Utah, Colorado as well. Resorts from Jackson Hole to Big Sky, Sun Valley to Whitefish, are all expected to see new snow, though many resorts will be closed by this point. The backcountry will be freshened up though. CM
Forecast discussion for Aspen-Snowmass and Western Colorado

Updated for Monday, August 21, 2017, at 6:40am...
Today and Tuesday, into Wednesday, more low pressure across the northwest US drives increased moisture and upper-level instability in across Colorado, with increased thunderstorm activity expected. Some heavy showers are possible, mainly on Tuesday as some upper-level instability adds to the mix. By Thursday and Friday we are warming up and drying out. CM

LONGER RANGE...
(UPDATING) --> We expect continued mostly increasing thunderstorm and shower activity across the area possibly lasting all next week, then wind and some cooling as low pressure responsible for the increase in showers across Colorado moves east and across the west with a drier west wind flow for Colorado. Late next week we expect a warm up as well, as winds become more southerly and draw warmer, more summer-like conditions into the area, but not quite as summer-like as we have seen previously. Late August, the last several days, look warmer than average, with isolated to scattered afternoon thunderstorms. CM
SnowMap Legend
CUSTOM FORECAST DETAILS
Weather Icon

↑52° / 11c°

↓37° / 3c°

Mountain Graphic

Sky Condition

Partly cloudy with thunderstorms likely

Snow Potential

None Expected

Precipitation

Scattered Storms (Potential precip: 0.28in, 7.11mm)

Wind

From the SW at 3 to 9 MPH.

Weather Icon

↑50° / 10c°

↓37° / 3c°

Mountain Graphic

Sky Condition

Partly cloudy with light showers likely

Snow Potential

None Expected

Precipitation

Showers (Potential precip: 0.24in, 6.1mm)

Wind

From the NW at 3 to 11 MPH.

Weather Icon

↑50° / 10c°

↓37° / 3c°

Mountain Graphic

Sky Condition

Partly cloudy with light showers likely

Snow Potential

None Expected

Precipitation

Showers (Potential precip: 0.17in, 4.27mm)

Wind

From the WNW at 8 to 11 MPH.

Weather Icon

↑52° / 11c°

↓37° / 3c°

Mountain Graphic

Sky Condition

Partly cloudy with scattered storms

Snow Potential

None Expected

Precipitation

Scattered Storms (Potential precip: 0.05in, 1.28mm)

Wind

From the NW at 5 to 9 MPH.

Weather Icon

↑52° / 11c°

↓37° / 3c°

Mountain Graphic

Sky Condition

Partly cloudy with scattered storms

Snow Potential

None Expected

Precipitation

Scattered Storms (Potential precip: 0.07in, 1.73mm)

Wind

From the NNW at 6 to 8 MPH.

Weather Icon

↑52° / 11c°

↓37° / 3c°

Mountain Graphic

Sky Condition

Partly cloudy with isolated storms

Snow Potential

None Expected

Precipitation

Isolated Storms (Potential precip: 0.24in, 6.18mm)

Wind

From the N at 5 to 8 MPH.

27 Sep 2016 - 11:20am PST
What is the weak La Nina/ ENSO Neutral SST pattern going to bring this winter of 2016-2017? We put together a comparison to some past possibly analogous years, here: Here is some guidance, using previous similar pattern years. This guidance is for Aspen, near base elevations (mid and upper mountain get 2 to 3 times as much snow).CM

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