Tahoe Weather Geek
Wednesday Oct. 15
The first of several troughs of low pressure spinning out of a deep low in the Gulf of Alaska is moving through the Sierra Nevada this morning but bringing little more than high winds, clouds and cooler temperatures.
Winds should subside this morning but gusts of around 50 mph are still possible.
The storm has generated some light rain and high elevation snow north of Tahoe but so far the Tahoe Basin has been mostly dry. We might still see a few showers and snow flurries as low as 7000 to 7500 feet this morning before the system moves through.
Another, similar low is due to reach the Sierra late Friday night but will split apart as it bangs up against a ridge of high pressure over the west, with any precip again likely to fall in far Northern California.
After a weekend warm up yet another low is in line to reach California by Monday. With the axis of the high pressure ridge shifting east, there might be room for the Monday storm to push into the Sierra with greater force, possible bringing some measurable precipitation to the region.
Stay tuned for more details.
Tuesday Oct. 14
High winds have begun to rake the Tahoe Basin and surrounding peaks in advance of a cold front that is expected to reach the Sierra later today and pass through Tahoe on Wednesday. Wind gusts of 50 mph have been reported in some locations this morning, and those will continue into Wednesday.
This storm is not going to be a wet one. Less than a quarter-inch of rain is expected through Wednesday, with most of that falling in the early morning hours, and mostly north of Truckee. Snow levels will be high but there is a chance of a few flurries as low as Donner Summit. Accumulations are unlikely.
The large trough of moisture in the Northern Pacific will continue to spawn storms through the weekend into next week. But a rebuilding ridge of high pressure in the west will largely deflect the first of those systems, on Friday and Saturday, pushing it into the Pacific Northwest. We might see a few showers in the Northern Sierra but nothing major.
Another system due early next week, around Monday or Tuesday, looks like it has the potential to bring a little more precipitation to Tahoe.
Monday October 13
A low pressure system brewing in the Gulf of Alaska is expected to push into the Pacific Northwest and then California by the middle of this week, bringing high winds and colder temperatures and a chance of light rain and snow.
The first sign of the storm system will be the arrival of strong winds Tuesday and Tuesday night, followed by the passage of the cold front early Wednesday.
Precipitation amounts are expected to be light, with perhaps a tenth of an inch around the northern edge of the Tahoe Basin and slightly higher amounts further north toward Mt. Lassen. We could see a few snow flurries over Donner Pass but accumulations look unlikely at this point.
The system is expected to move through by Wednesday afternoon, with cooler temps and 40 mph to 50 mph gusts in its wake.
Although a deep trough of potential moisture will remain over the Pacific, a ridge of high pressure over the west is likely to block any additional storms from reaching California. Some cloud cover is possible Thursday and Friday as those storms move into the Northwest.
Warmer temperatures are expected to return by the weekend.
Thursday Oct. 9
Unseasonably warm weather will continue into the weekend before a change in the pattern beginning Sunday opens the door to cooler temperatures early next week.
Two systems are on the horizon that are likely to make things in Tahoe feel more like fall than late summer after the next few days.
First a cold front will drop into the Great Basin and Nevada Sunday, bringing north winds and colder temperatures. Highs in the region should drop by about 10 degrees, closer to normal for this time of year, and overnight lows will be near freezing in many parts of the Tahoe Basin.
A second low pressure system building in the Gulf of Alaska will likely push a trough into the Pacific Northwest and Northern California by Tuesday or Wednesday. This will bring more high winds and continued cool temperatures. As of now it appears as if most if not all of the precipitation with this system will remain near the Oregon-California border. But that could change as it moves in. We will keep our eye on it and let you know as it develops.