The Chance of Showers and Thunderstorms return Saturday through Sunday with less of a chance on Memorial Day….A taste of Summer definitely in forecast by Tuesday though Friday next week…
Friday May 27, 2016
Posted at 11:00 pm by Howard
Weak deformation zone has set up over Mono County showing up on the 850MB. Light showers and some thunder so far in Mammoth with the snow level above 10K.
Showers will trend further north with time……
Looking at the 00Z Saturday WRF…..the upper flow at the moment is light from the NW. A weak wave is forecasted to come through early Saturday AM. This will spin up a small upper low off the South Central CA coast Saturday with the upper center over Southern CA Sunday. The Dweebs did not see any specific areas of Deformation. However, worth noting is a pocket of strong upper divergence developing at 250MB over Mono County. Additionally, there is a strong corresponding area of Convective Available Potential Energy (CAPE) of between 750 and 1000 J/KG progged for Mono County Saturday afternoon into the evening. Thus…..Showers and Thunderstorms will likely form here and there…..especially if an area of deformation sets up during the afternoon. Weather conditions are similar Sunday….
Highs Saturday 63 …Sunday 65 Monday 69 Lows in the 30s….
The outlook for next week shows an upper ridge building in with above normal temps resulting. We may see low 70s by Tuesday then through Friday……Enjoy!
Dr Howard and the Dweebs………………:-)
Chilly Weekend to be followed by the potential of some significant snowfall Tuesday PM Through Wednesday AM……Cold Mid May adjustment wave over the far west is pretty much stationary through much of next week….The Dweebs will keep a weary eye on the Memorial Day holiday weekend……
Saturday May 21, 2016
Posted at 8:55 pm by Howard
A Broad Trof remains over the far west this week with the upper jet west-east across Paso Robles to DV. Thus Mammoth remains on the cyclonic side of the upper jet. Several impulses will move through the broad upper trof the next few days allowing Rain showers and snow showers to occur. Some showers may be moderate with the potential for hail and accumulating snow mainly at elevations about 9K. A combination of deformation over Mono County, Upper Divergence/afternoon CAPE, will make for a potentially active late afternoon today…… This unsettled pattern is likely to continue off and on through this week. The TOML may pick up an inch or 2 of snow over the next few days…At elevations above 8K
The Holiday Weekend is looking less active at this time with cooler than normal temps and isolated showers. High temps near 60 each day over the holiday weekend…lows in the low 30s. The Dweebs are still in the camp for the possibility of 3 to 6 inches of snow above 9000 this week…..Mainly Tuesday through Thursday AM…
Saturday Evening: 8:55PM
Like yesterday, temperatures ended up 20 degrees below normal for Mammoth with todays high of 45 similar to yesterdays 44. There was over 12 hours of below freezing temperatures last night, with lows in the upper 20s. The duration of the below freezing temps qualified for a hard freeze last night and this morning. With the freezing level rising Sunday, temps will rise with highs near 50 at the Village. Most of the precipitation over CA has been under the cold pool over Northern CA. The short wave coming in this evening has little moisture with it. Nevertheless we might get a dusting or so over the upper elevations. The long wave or west coast adjustment wave will remain in place over the California next week. Individual shots of energy “are not storms” but impulses/Vort maxes that will travel down the coast then inland over the southern half of CA, during the first half of this up coming week. This is all part of the same system that is bringing much colder than normal temps to our region, snow flurries in town and snow showers on Mammoth Mt.
The latest guidance from CRFC at 21Z today had the QPF of up to nearly 2/3rd of an inch beginning Tuesday afternoon through Wednesday AM over the west side of the sierra crest. This particular strong vort max spins up to a closed center “off the coast” all with in the same upper western trof. The forecast for .63 looks good for 3 to 6 inches of snow at and above 9,000, mainly late Tuesday afternoon and throughout the night Wednesday. The Dweebs will update on this short wave Monday to see how it is coming along…and will adjust for any change in amounts if necessary…….
Expect a cool unsetteled week ahead with a slight chance of showers and thunder each period the next few days…..Temperatures will run below normal….As the Great Basin Upper Trof reloads and retrogrades….even more unsettled weather is expected over the weekend……
Monday May 16, 2016
Posted at 8:27 am by Howard
This mornings 5 day means from the ECMWF Control Ensembles showed a ridge at 140 west and a Trof in the mean over the Great Basin. A NW flow is occurring over CA with limited moisture. Strong Mid May daytime heating will destabilize the atmosphere enough for a “few” thunderstorms over Mono County. The track of an upper low over the Great Basin today is south….Then SW over Southern CA Tuesday. This gives the southern sierra the main focus of any thunderstorms action, especially Tuesday. It will be slightly cooler today and Tuesday. Highs in the upper 50s to near 60 in Mammoth with lows near freezing.
The weather pattern according to the 00z Monday European ensembles this week shows the upper high near 140west both retrograding and amplifying. This will retrograde the upper Great Basin low westward forming a rather deep low (for this time of the year) over the far west over the weekend. This upper low has been well advertised the past 3 to 5 day for next weekend. The Dweebs expect the upper low to be preceded by wind Thursday afternoon into Saturday AM with Snow over the upper elevations and rain or snow in town this weekend.
It is too soon to forecast any amounts of snowfall on Mammoth Mt at this time.
The long range models keep the trof in the mean over the far west or far eastern pacific for a few weeks.
Dr Howard and the Dweebs………….