Outside of the areas of freezing fog like Lee Vining and Crowley Lake, our weather throughout Mono County has been Steller with highs well into the 40s at resort levels and low 20s at night. A stronger upper ridge will build into the region tonight into Friday. Valley inversions are likely to continue the next couple of days with high temps climbing into the mid 50s in Mammoth and June, with lows continuing in the 20s.  The Valleys will remain colder with Freezing fog around the areas lakes through Friday AM.

A change in the pattern will be under way this weekend. The upper ridge breaks down this Friday night and a system moves into the Pacific NW Friday night. This will increase the breeze Friday night and hopefully bring enough wind to hinder Freezing Fogs to develop along the highway 395 corridor Saturday AM.  The first system probably won’t bring significant cooling to the high country but breeze yes!

A stronger upper jet will dig down into CA Monday. The GFS has come into more of an agreement with the ECMWF in it being more of a NW slider, and so expect a dryer scenario in this case. Nevertheless…..Light amounts of snowfall seem likely at this point. Amounts 1 to 6 inches, something like that Monday. Modified polar makes a return to Mammoth early next week as well.

The following system for Thursday and Friday is more complex as it “may tap” moisture from a subtropical Jet, emanating from a closed low NW of Kauai. This mornings 12Z deterministic run of the GFS has confluent Jets on Thursday the 1st. Of course it is very early in the game of forecasting to actually believe such scenario at this moment of time. However, this would at the least, offer moderate amounts of snowfall. (6 to 18 inches). However, in checking the same 12z run of the GFS “Ensembles”, the system NW of Kauai has too much downstream ridge to allow enough energy and moisture to converge with the polar Jet along the west coast.  So…”At this time”, it appears that this may be, another system with marginal over water trajectory Thursday and Friday. Stay Tuned!…Will update in the next day or two!

The Dweebs hope all readers have the best Thanksgiving and as always, thanks for your interest and reading!  🙂


Dr Howard and the Dweebs……………….:-)