After a slightly cooler weekend, a major heat spell will engulf California as the subtropical high rebuilds once again and a heat wave takes over the southern half of the state. High temps will be near record levels by mid week next week in Mammoth and hold through the holiday weekend. For Southern CA,  desert heat moves into the valleys by mid week with highs between 100 and 110 later next week. Lows at night in many areas will be in the 80s. Question is, where does our weather go after Labor day? GFS has very high precipitable water levels along with high dew points by the middle of week 2 for Southern Ca as tropical systems both in the Gulf of Mexico and Eastern Pac give a one-two punch. Worth noting is that the ECMWF is not nearly as aggressive with that pattern later week 2.  As always, time will tell.  For the high country; The Labor Day holiday weekend will be more mid to late July like temperature wise, with highs running 10 to 15 degrees above normal.

Labor Day holiday weekend in So Cal could be a scorcher.

Plan ahead for near record heat.


Dr Howard and the Dweeb……………………:-)



Some small changes over the weekend will bring a bit cooler weather to the high country as a trough of low pressure pushes through the Pacific NW. Expect a degree or two of cooling beginning today Wednesday and each day thereafter through Sunday.  Today Wednesday is expected to be 79 degrees in Mammoth with mid 70s by Saturday and Sunday. An enhanced Zephier is expected this weekend making for the potential for critical weather WX. Winds could gust in the 30 to 40mph range!

The longer nights and drier airmass will allow lows at night well down into the 40s this weekend with even some 30s in the colder valleys.

Next week models shows more anomalous warmth by mid week as another strong upper high build over the west.

Record or near record high temperatures may return mid week next week!

Climatically…..The average high in Mammoth is now near 70 and low 90s in Bishop.   Who knows what’s normal!!


Dr Howard and the Dweebs……………………………..:-)


PS   For those that wish to know where the monsoon went; its over Texas!

PPS  September is an interesting month for the southern and central west coast. Watch out for dying tropical storms coming up Baja, who’s moisture may get caught up in an approaching west coast trough, then into Central California and Sierra around mid month!  😉




Hard to say whether this will be the last hot week of the Summer.   Models are waffling on the Labor Day holiday weekend in the week two period. Some runs have unusually high 500mb heights over the Great Basin, other runs showing SW flow with troughing to our north.   Meteorological Summer ends a week from this Wednesday on the 31st so model week 2 accuracy will go down with the seasonally change

In the meantime, we have a nice afternoon Zephier that will take the edge off the heat this week. 15 to 30MPH in the late afternoon. Longer nights will allow good cooling to occur before sunrise.  Highs this week mostly in the low 80s with lows in the 50s.  I looks a little cooler this weekend but still at least 5 degrees above normal.