Mammoth Mountain Weather Forecast & Discusion

1-10-25 @ 9 AM Weather Summary: There will be a brief change in the wind flow today, with SW winds expected. By Saturday, the next low will form to our east and usher in a North flow that will bring cooler air into the area and gusty N to NE winds over Mammoth Mountain that will last into next week. Currently, there is no snow in sight for the next 6-10 days. 

If you’re out on the hill today, temperatures at the first chair will be in the low to mid-20s, and midday temperatures will be in the mid to upper 40s from Main Lodge down to Canyon Lodge. Temperatures over the upper mountain will be in the upper 30s to lower 40s.

Winds on the Lower Mountain will be southwest 5 -10 mph. Over the Mid and Upper Mountain, there will be a Southwest wind of around 15-20 mph, with gusts as high as 25 – 35 mph.

On Saturday and Sunday, temperatures at the first chair will be in the low 20s, and midday temperatures will be in the lower to mid-30s from Main Lodge down to Canyon Lodge. Temperatures over the upper mountain will be in the mid-20s. 

Winds on the Lower Mountain will be Northeast at around 10 mph. Over the Mid and Upper Mountain, the west wind will be Northeast at 20 to 25 mph, with gusts as high as 35-45 mph.

Mountain Winds: As the gif below shows, there will be periods of gusty N to NE winds on Mammoth Mountain into next Wednesday. These are cold upslope winds that blow in your face as you ski and ride down the hill. I would advise you to have face protection on upslope windy days. 

Temperatures: The Upper Air Temperature Anomaly shows cooler air arriving in the Mammoth area on Saturday. When the north-to-north flow moves into the area, you can expect cooling on the East Side.  

Long-Range Fantasy Outlook & Discussion: The 7-10-day forecast remains dry; beyond that, ensembles show some snow possible after the 21st of the month. The ECMWF is very weak with the possible change, while the GEFS is wetter. Currently, all bets are off any of the outcomes we see in the long range. 

Below is the 00z run of the ECMWF ENS; as you can see, ridging to our north and a cut-off low to our S will be the leading players over the next 10 days.

The Longer-Range ECMWF Seasonal for February still gives us hope for an average snowfall month. 

The reality is that there needs to be a major change in the weather pattern soon, or this is going to be a well below-average snowfall season.

Hopefully, in the next week or two, we will start to see that on the longer-range model trends heading towards wet across the entire site.

Forever Hopefull for a series of Powder Storms, Steve Taylor – the Mammoth Snowman