Upper High over Nevada to Weaken Today Allowing Moist Upper Flow to finally move North through the Central Sierra…..Showers and Thunderstorms a good bet the next few days……
Monday July 22, 2013
Posted at 8:57 am by Howard
Tuesday AM Update:
NWS Hoists Flash Flood Watch for both Inyo and Mono County’s:
Campers, Hikers and Fisher folks keep your eyes on the weather today. Be aware of your surroundings and stay away from areas prone to flash flooding. IE Canyons, Arroyos, creeks and stream’s. If heavy rain is observed upstream get to higher ground.
Latest 12Z WRF has very slow moving VT Max along the Inyo/Mono County boarder ATM….shifting NNW so far. PWAT chart has rich isopleath of 1.8+ over Kern Co/Inyo Border with gradient right up the Owens valley and Mono County. CAPE in our vicinity is near 750 Jewels per KG. IE AIRMASS is Very Buoyant with convergent/divergent couplet
Main message is for areas of very heavy rain today. Travel on roads between Eastern Ca and Nevada through areas “like” West Guard pass/Lida Junction will be dangerous this afternoon due to potential for Flash flooding. Additionally, areas along the Sierra in historically flash flood prone areas will be the same.
Another very warm weekend has come and gone as an area of strong high pressure acted to break more high temperature records as well as develop mainly air mass showers and thunderstorms. This mornings guidance is a bit different as the upper high that created another high of 105 in the Reno area for the 4th time this Summer…and upper 80s in Mammoth is breaking down. The strong easterly wave that moved out of AZ and into Southern Ca over the weekend is now associated with an area of low pressure off the coast of Baja. To its NE is PWATs in the range of 1.5 to almost 2 inches.
With the upper high over NV breaking down, monsoon moisture and dynamics are being allowed to move north and invade Eastern, Ca , Southern Ca , the Southern Sierra and eventually up through the Central Sierra later today. Vandenberg, sounding was over 1.5 Pwat this AM. A vort max near the coast of south-central Ca was enhancing shower activity near Paso Robles this AM. A Divergence/Convergence couplet was located over the Southern Sierra at 1600UTC.
Flash Flood Watch’s were issued for portions of White Mts adjacent to the Owens Valley Today. Scattered TSRWS were in the forecast for the Mammoth area…..with the action going possibly into the night tonight and continue Tuesday.
If you are camping and or hiking be sure to keep an eye on the weather this week for the possibility of heavy rainfall in the Sierra.
High temps will not be as high the next few days because of more cloudiness and moisture. Nighttime lows will be higher…..