High Pressure aloft has build into California over night making for a warmer day today. As highlighted…the Summer Solstice arrives later this afternoon with tomorrow Thursday the first full day of Summer. However, Mother Nature is not without her irony. Because as the days get shorter during the month of July….Mammoth will enjoy its warmest days of the year!

Were still warming up and cooling down….

So far Spring weather continues as Mammoth is still responding to the weather systems moving into the pacific northwest. Although the seasonal heat that has developed over the deserts to our East and Southeast…..retarding or even blocking the trofs into the northwest, their effect still continues with the cooling they bring along with their winds. The next Trof approaching the northwest is stronger then the one that brought wind and cooling last weekend. SW Winds will begin to come up Thursday afternoon in the form of a zephyr with local gusts to 40MPH by days end. This is primarily due to the Thermal trof jumping east of the Sierra Thursday with local gradient winds effecting our area. No synoptic cooling is expected from that system.  However, as we get into Friday and Saturday, significant synoptic scale cooling with as 10 degrees or possibly a bit more is expected Friday through Saturday. Local winds will be both gradient force and well as the indirect effects of geostrophic flow. Highs in Mammoth will bottom out in the upper 60s to near 70 by Saturday. Lows throughout Mono county will be mostly above freezing in the 30s with a few areas possibly getting down below freezing Sunday AM.

Longer Range:

GFS means Days, 3,5,8 and 11 are suggesting that the trof in the mean near the Pacific NW will weaken next week.  With the Key negative height anomaly over the north central pacific. Although a small adjustment wave still appears to be in the picture near the pacific NW, it is not strong enough to indirectly effect us geostrophically.  At the same time….incipient Monsoon flow appears to want to begin next Monday over southeastern Ca, Southern NV into AZ.  The guidence shows this flow becoming better organized and a bit stronger toward the Holiday as the SW Continential high becomes better organized. IE (AZ Monsoon)

The Dweebs expect mid 70s to return by early next week in Mammoth with warming to the low 80s by the following Saturday then low 80s right into the Fourth of July with diurnal afternoon convection and isolated Thunderstorms and RW possible. All in All it looks like Typical Summer WX!!  Enjoy!!


Dr Howard and the Dweebs………………………:-)


Reference Glossary of Weather Terms
Disclaimer: I have been a hobbyist meteorologist for over 30 years here in the Mammoth area and I do this for my personal enjoyment. The National Weather Service saves lives every day . . . I do not. When making important planning decisions please use information provided by the National Weather Service as they are the most knowledgeable and accurate information source available today.