What remains of the Summertime four corners high will dissipate over the next few days as late summer troughs from the Gulf of AK head to the west coast. The transitory short waves will bring cooler air to our region and even the Desert SW.  This in turn breaks up the upper high in that region and will likely bring an end to the Monsoon Season by this weekend. This transition from Summer weather to Fall weather usually happens in September. Meteorological Fall was September 1st, contrary to astronomical fall which occurs about the 21st.

In the meantime, southerly flow will bring moisture and thunderstorms through Thursday; a passing Trof Thursday night will give way to a drier air mass. The next trof for Saturday/Sunday will bring quite breezy weather Saturday afternoon and night followed by cooler temperatures Sunday into Next week.  Thickness falls suggest that some frost may occur both Sunday and Monday mornings in some of the typically coolest valleys, with Mammoth just getting down possibly to the mid to upper 30s. Daytime highs will move from the mid 70s to the mid to upper 60s by Sunday and Monday.  BTW;  high temps in the low 70s is typical for Mammoth Lakes this time of the year.   Lows in the 40s.

 

The extended outlook is dry with breezy weather early next week then a warm up expected the 2nd half of next week with well above normal temperatures beginning next weekend into Week 2.   September 15th on…..

The ECMWF is bringing subtropical moisture into our region week 2 so thunderstorms may return again, the following week.  (15th-21st)

 

Dr Howard and the Dweebs……………………….:-)