Mammoth Mountain & Eastern Sierra Weather Forecast

Mammoth Mountain & Eastern Sierra Weather Forecast

Mammoth Mountain & Eastern Sierra Recreational Weather Forecast

Friday, September 24th, 2021 @ 11:43 AM

Good afternoon everyone, checking the window cast the haze and smoke are slowly starting to move back into the Eastern Sierra. Right now areas above 8500 feet north of Crowley are being affected. Over the next 24 hours, I expect all areas to be overtaken by the haze with the wind flow changing over to the W to SW.

Taking a look at local conditions the last couple of days. Yesterday at the top of Mammoth Mountain there was a high of 42. The peak wind gust was 40 MPH out of the ENE. No record of the low this morning as the weather station system up at Mammoth Mountain is having some issues today.

In Mammoth Lakes, the temperature peaked at 70 degrees with a low of 40 degrees this morning. There was a peak wind gust today of 13 MPH out of the NNE.

Down in Bishop, there was a temperature of 89 degrees with a low of 50 degrees this morning. There was a peak wind gust of 12 MPH out of the SSE.

Temperatures: Mammoth Lakes will be in the mid-70s Friday into Sunday with overnight lows in the low to mid-40s. Down in Bishop and the Round Valley areas highs are expected in the upper 80s to very low 90s with lows in the mid-50s. 

Winds: Into Monday expect Southwest winds 5 MPH to 15 MPH with stronger gusts over the higher elevations and mountain ridges.

Precipitation: All clear thru the weekend now. There could be a dusting of snow later on Tuesday possibly early Wednesday morning.

Here are the links to the local NWS Forecasts for Main Lodge & the Mammoth Lakes BasinMammoth LakesJune LakeCrowley Lake, and Bishop.

Fire and Smoke Forecast: Expect periods of Smoke and Haze Friday Afternoon through the weekend in the high country. Lower elevations are hazy but have better air quality at this time. Most likely by Saturday, all areas in the Eastern Sierra will be dealing with some amount of smoke and haze.

Looking at the wind flows over the next couple of weeks I would expect periods of clear skies with clean air and then periods of haze at times. Right now the two fires that are burning to our south have a ton of fuel to burn through so we will be playing this game for a few weeks.

Current Air Quality Image

Today's Weather Story

9-24-21 @ 1:12 PM 

Here is a look at today’s weather story for the next week, be forewarned at this time a year the outlook period seems to change about daily. (It can drive you nuts unless you learn it’s transition season and this is what happens.)

With that said, A ridge of pressure is still over the area and bringing nice warm early Fall temperatures to the Eastern Sierra. The ridge will be moving to our east over the next 3 days.

Next up a deep low pressure system will move into central California around Tuesday of next week.

The low is moisture starved but it could offer up a dusting of snow above the 8500 foot level around Tuesday of next week.

A week out from today heights rise again and bring temperatures back up to seasonal averages.

No signs yet of any strong AR systems moving towards California at this point. Way to early to expect anything, but we have seen good rains at this time of year in the past so we hope for a change. Snowman

Fantasy Long Range: These charts can be fun to look but are not to be taken as a forecast.

ECMWF Seasonal Ensemble Mean – Monthly Update 9-5-2021

Mammoth Mountain and Eastern Sierra Weather Posts

Who Are We?

Steve Taylor – Mammoth Snowman Over the last 30+ years, Snowman has spent countless hours studying and learning about Mammoth Mountain Weather and Snow Conditions first hand. He has been skiing around the hill with marked ski poles since March of 1991 so he can measure the fresh snowfall amounts out on the hill. 

Snowman started blogging this information back in 1990 on the old Mammoth BBS system, then the RSN Forums and then on to in 2004 with Video & Photo Blog report. (No YouTube back then). Facebook got added to the fold back in 2008 and then the Facebook Group in 2016. 

Reports, videos, and photos from the website have been featured on both local TV Stations here in Mammoth, along with AP, Fox, ABC, CBS, and NBC News.

Ted Schlaepfer – Mammoth WeatherGuy – The Powder Forecast – Posted Tuesday and Fridays at 5 PM November into Mid May. These forecasts are now responsible for many people getting multiple powder days on Mammoth Mountain over the years.  

Ted’s Bio: Ted has been a full-time Meteorologist (CCM) for the past 25+ years. He has always been fascinated with the weather,” skiing was just a natural extension of my love for snow and rain. I started skiing at age 5,  first discovered Mammoth in 1979 as a youth, and have been a regular visitor since the late ’80s.”.

Here is the link to The WeatherGuys Powder Forecast Page. 

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