Mammoth Mountain Weather Forecast & Discussion

January 30th, 2023 @ 10:19 AM

Mammoth Weather Summary:  4-6+ inches of new 15:1 snow has fallen from the small system that is now to the south of Mammoth Mountain.

Skies have now cleared out under a NE Flow that is ushering in a very cold modified arctic air mass. The cold NE flow will remain in place on Tuesday as the low continues to drop to the SE of the area.

By Wednesday into Thursday there will be a short wave ridge of high pressure in the area and that will allow winds to move over to the SW.  Temperatures will also come up to about average for the start of February.

If you’re going to be out on the hill on Tuesday expect clear skies with temperatures in the mid to upper 20s. The wind will be out of the NE @ 15 to 20 mph, with gusts as high as 35 -55 mph over the higher elevations.

Wednesday and Thursday look for pt cloudy skies at times with highs around Main Lodge into the mid to upper 30s. Winds will also shift over to the SW @ 5-15 MPH with gusts to 25 MPH over the higher elevations.


PS: Scroll down the page for the full Mammoth Mountain Weather Discussion & Long Range Outlook

Mammoth Mountain 10 Day Outlook

Below is the ECMWF Operational Model for the next 10 days. You can see the low that is dropping to our south today being replaced by a short-wave ridge of high pressure.

Next up is the weak low that is coming on Friday followed by a possibly moderate system next Sunday into Sunday night. Those two systems will be followed more ridging that lasts right out to Day 10.

ECM 10 Day Outlook

Below is the ECMWF 24 hour Snowfall Forecast for the next 10 days. The gif shows the weak system for Friday followed by the moderate system on Sunday that should result in a powder day for next Monday.

ECMWF 24 Hour Snowfall Outlook

Mammoth Mountain Long-Range Discussion

1-28-23 – Taking a look at the long-range outlook, Mammoth Mountain is back in the drier La Nina pattern that we saw last season. Do look for some snow over the next few weeks, but the overall consensus is to expect well below-normal snowfall during February.

The La Nina is weakening fast now and if that keeps up there could be some decent snow in March and April.

Overall the Mammoth area is around 135% of the average for the entire snow season, so even if there are some drier times the mountain will still be well above normal for the season.

Pray for Snow, Snowman

ECM Precipitation Outlook into February 7th
ENSO Outlook

Mammoth Mountain and Eastern Sierra Weather Posts