Its been a fabulous few days, enjoying the spring thaw and the warm high country sun….   The  Forecast models show a small upper low moving the Southern CA and Northern Baja today and tonight. Unstable air will interact with the high mid August like sun today for a chance of mainly high elevation showers Monday. The upper ridge over the Eastern Pacific will amplify northward and help an overland cold front to deepen south Tuesday. This in turn forces short wave energy to drop south over the Northern Great Basin and along the Eastern Slopes of the Sierra Tuesday, into Early Wednesday AM.  Although there may be a few showers from this Cold Front, for the most part over Southern Mono County it will be just wind and cooling.  Highs in Mammoth Tuesday will hang close to the upper 40s during the afternoon with a hard freeze Wednesday AM with lows in the mid 20s. A warm up is expected to begin Wednesday afternoon into Friday with highs once again in the upper 60s by Friday.

Looking onward, it’s all about the Eastern Pacific Ridge as it builds northward with a weak undercutting of the westerlies. This allows short wave energy to once again cross into CA over the following weekend. (Cinco de Mayo) Thus the pattern appears to be repeating itself with a minor closed low, this time coming in north of Santa Barbara for a better pattern of upper diffluence and upper divergence the next weekend for the Sierra. Then yet another System will follow from the north mid week, similar to what we expect tomorrow Tuesday.


Both the 6 to 10 day and 8 to 14 day outlooks show above normal precipitation for the Sierra. Of course above normal precip this time of the year doesn’t always mean much snow or rain. Not because of temperatures but because the climo is pretty dry by early May.


Bye for Now….


The Dweeber………………..:-)