A weak trough of low pressure over the Great Basin today will present conditions favorable for the chance of showers and or thunderstorms this afternoon and evening over the Sierra Crest. The upper low will slowly move east on Wednesday, but lingering instability will keep
a small threat of storms to continue Wednesday for the central and southern Sierra. By Thursday, drier air moves in as high pressure ends the threat of thunderstorms. On Friday, a dry southwest flow becomes westerly due to a pretty strong trough in the Pacific NW. The exceptional strength of that upper trough is directly related to the effects of the old Typhoon Jebe, that has now become constructively phased with the westerlies. Had this phasing occurred in October, we would be looking a possible cold, windy, snow showery period here in Mammoth. In early September, that is not the case. So the weekend looks fair, and possibly a bit breezy early on, but warm.

 

Dr Howard and the Dweebs………………:-)