Some Thunder in the forecast the next few days….Then warmer for the weekend…..Next cool down comes later next week with fall-like Trofs effecting Mainly the Pac NW…….Cooler weather 2nd half of next week.
Tuesday September 10, 2013
Posted at 8:42 am by Howard
Upper low over Nevada now with counter-clockwise flow at 700mb back washing some moisture into the Eastern Sierra over the next few days. Yesterday there looked to be a storm over the Yosemite valley. For those that want an update on the Rim fire, here is a link to a good blog that will help: http://northcasmoke.blogspot.com/
High temps the next few days may be a bit cooler, just because of the added moisture and cloud cover with highs closer to 70 in Mammoth Lakes. Lows in the 40s.
The outlook finally shows the upper low moving east by Friday night so that the weekend is clear and dry of moisture. High temps will rise again into the weekend back into the mid 70s with lows in the 40s.
There appears to be major changes to the larger scale features over both the eastern pacific and far west that will put an end to…the persistent hose of monsoon moisture moving out of Mexico and effecting the desert southwest about the middle of next week. The first series of Fall like Trof’s that have been advertised for over a week now by both the Climate Forecast System and GFX would begin to move into the great basin about Tuesday or Wednesday. This may be a bit fast but it is significant change and about time. The Climo is favorable for a series of Trof’s to begin their march in the Pacific NW about the 3rd to 4th week of September. The GFS advertises for the Central Sierra, thickness cooling, gradient, stronger winds and cloudiness, all from the Gulf of Alaska…… and snows for the Cascades!
We finally got rid of the haze this morning as the gradient was not strong enough yesterday. Stronger NNE flow took care of that. This mornings 12z NAM showed a weak upper low over NW Arizona that will wobble NW into NV and remain there for a day or so. The upper flow has been quite moist to the east of the low. Apparently, some wraparound will affect the sierra the next few days and so the chance of some showers or thunder may occur from some interesting directions. Over all there is a slight chance as the AZ monsoon season comes to a close this month here in the Central Sierra.
High temperatures have been in the mid 70s in Mammoth and with the drier air of late, the longer nights have contributed to some good radiational cooling with temps well down into the 30s and 40s.
It will be gorgeous! high tempos will make a run for the upper 70s where in the Owens Valley possibly near 100. By the way….. the latest 100 hundred ever recorded in Bishop was in 1971 on the 14 of September. You may tie that record, or if it happens Sunday or Monday break it by it occurring a day or two later. As I am saying….there is a chance!
The Dweebs see quite the trof on the horizon later next week!!! Cooling…gusty winds….????
Dr Howard and the Dweebs……………………….:-)