Its been called the best start to the ski season in 5 years! 12 to 30 inches at 3:00PM Tuesday…more light snowfall tonight!

Friday AM:

Main focus is now the late Sunday though Monday night system.  As indicated earlier, this system looks to be a light to at most moderate precip producer. QPF Amounts forecasted are between .30 and .50 on the west side. There will be an orographic component and so the combination of the temperature of the air mass, IE Snow to water ratio’s);  QPF and Orographic’s may still be enough to drop 5 to 10 inches over the upper elevations and that may be pushing it..  The snow that falls with be light and fluffy but not making Platinum criteria. (15 to 1 with a foot or better).


In town it will be all snow, contrary to the last storm,  2 to 5 inches is possible.


Thursday 1:00PM Update:


Lots of smiling faces around with ski conditions rated by locals as very good!  Lifts Chair 3, Broadway and Ch 11 are open for business!


Next weather system will begin as snow to the Town of Mammoth as early as Sunday afternoon with the IOP Monday, Sunrise to 11:00AM.


Early Est. show between .6 and .9 over the crest depending upon which model it is.   This storm is colder than the last but will be faster moving.

I expect between 5 and 10 inches at this time over the upper elevations and 3 to 5 inches in town.  I’ll have another update Friday….


The Dweeber…………………………………….



Mammoth Mt Update: 12 to 30 inches storm total!


Tuesday November 3rd Update:

The Dweebs are beginning to see the right kind of biases in the models for the southern half of the state.  It takes a few storms in November sometime to get some sense of the biases of storms and their track..  One of the biggest messages and in fact a (((SCREEMING MESSAGE))) is that the “RRR” IE, the Ridiculously Resilient Ridge-Resilient-Ridge has not redeveloped along the west coast so far this fall. It seems to have found a home north of Hawaiian Islands where we like it!


Additionally, there is “beginning to be” a trend or bias of storms digging further south in the GFS, noting the new 12z run of the “GFS T1534” for next Monday where earlier model runs brought this is as a NW slider for Mono Country favoring the Northern Sierra. The GFS now wants to dig it further south before turning east.  In an El Nino year, the Dweebs would expect storms that bias a more southern track and that is currently starting to happen. However, this is not the pattern you would expect from El Nino yet.  At the moment a combo of the ECMWF and GFS has upped the amounts to between 6 and 8 inched over the upper elevations for the Central Sierra next week for the 9th/10th next week.  But that is just a snap shot of that time frame which is some 6 to 7 days away.  PS….the latest 18z GFS as a stronger west coast system for the 16th. The EC has not got it yet….


What is just beginning to develop in the longer range charts are what snow dreams are made of, as the previously mentioned RRR is no ware to be found.  The long wave ridge position is west of Kauai.


I will have my first pre weekend forecast for the Platinum powder subscribers Tonight for the Thursday opener…..I guess Mammoth Mountain could not wait!


El Nino:

The latest update from the Nino basin’s 3 and 3.4 show SSTA’s of 2.8C to 2.7C. This represents peaking possibly in this anomaly. I would say that there may be a little more warming based upon the updated KV in the far tropical eastern pacific. but the SSTA anomaly will most likely remain where it is to just slightly warmer the next 4 weeks.


NOTE: the new forecasts for the CPC show the eastern US having last years western blow torch and the reverse for west.


The Dweeber……………………..:-)


Although the snow was pretty wet in town, Mammoth mountain has picked up some great early season accumulations for 11 to 18 inches with another 3 to 6 inches possible over night…… The back of the storm is currently moving through Mammoth at the moment with light to at times moderate snowfall continuing.  Cold unstable air aloft will allow snow showers to continue through Tuesday evening. Although the main upper low will stall out over the Great Basin, another band of snow may develop Wednesday morning. Latest short term guidance is digging a slider further west for mid week for this purpose.

More on that later….

The next opportunity for addition storminess in the outlook will be with a new storm about the 10th.


Dr Howard and the Dweebs…………………….:-)



Low pressure system approaching west coast will weaken and sheer as it moves through Wednesday and Thursday….light amounts of snowfall will occur over higher elevations Wednesday/Ngt ……..Much colder system may dig south over the Sierra this coming Monday….

Brief update Monday AM:  Full Update Later today….

  1. California Rivers center shows about 2.00 of QPF slated for our own Sierrra crest by Monday night.  the break down is an inch of qpf between 4:00am Monday and 10:00am so that will be the heaviest period.
  2. .55 from 10:00am to 4.00pm   It will  be all snow near the village soon…
  3. Another .50 between this evening and Tuesday PM…

Overall this is a 6 to 12 inch storm for the town and 1 to 2 feet for Mammoth Mt



5:00PM Wednesday Update:

1st Call……

This is a quick update for the QPF for the cold storm Sunday night through Wednesday.


Steady Snowfall to begin Sunday night and will end mid Monday morning.  Snow showers will continue through the day Monday. Snowfall will increase again Monday night,  then if Euro model is correct, snow showery Tuesday through Wednesday night with light accumulation’s. Few lingering showers possible Thursday. Dry Friday through Saturday next week.

QPF snowfall totals via the European model will range from 12 to 18 inches over the upper elevations at and above 9K.  Roughly 1/2 of that at the Village and half again of that 1/2 , at Highway 395 east of Mammoth. The storm is 4 to 5 days away and so amounts are subject to change.

Snow levels will fall to the Mono County Valley floors by Tuesday..  Highs in town Tuesday in the 30s with teens and 20s on Mammoth Mt.

Fabulous snow making conditions Monday through Thursday if the EURO is correct as the upper low lingers into Thursday…to the contrary, the GFS is more progressive.


Tuesday Noon:

As of late…those that are following the MJO know that there is a lot of amplification in the RIMM over the Western Indian Ocean. According to the CPC, they think that it is being supported by a Kelvin Wave traveling east through that area. They feel that it is highly unlikely that the MJO signal will remain strong or move as far east to the  Maritime Continent.The El Nino base state has very strong upper subsidence over that large region north of Australia that makes up the Maritime Continent.   However…..Just an FYI  for the west coast of the CONUS.   A strong MJO progressing east from south of India, between 70E and 95E may flip the PNA to negative over the eastern pacific. Additionally…looking at the MJO composites, in November, if a strong signal goes from Phase 1 then 2 to phase 3…the odds are pretty high for the PNA flip and thus cold wet weather for CA. Maybe this is what the new deterministic ECMWF is looking at….  (See Below)


Outlook for next week….

The new October 27th, 12Z Euro really dumps the cold air in here with 700MB temps dropping to -8C by Tuesday morning.  This system is from the Gulf of AK….Taps a lot of cold air from AK and BC, Can. Then drops pretty much SSE over the top of us. There is some over water trajectory, but the main dynamics will be in the cold core low as it moves over the top of us..  QPF is suggestive of up to a foot this far out over the higher terrain but this system is cold enough to bring snowfall to most of Mono County above 6,000 ft. early next week.  If by chance the storm digs back west a few hundred miles….then were looking at something different….


More later…..Lets light this Candle!


Dr. Howard and the Dweebs……………….:-)


The weather system west of the US has an upper Low pretty much anchored in the Gulf of AK. The upper trof pivots negative tilt and sheers southeast into CA Wednesday.  It is picking up quite a bit of subtropical moisture at this time. The guidance is in agreement in weakening the upper dynamics as it moves into California Wednesday. In the meantime, lots of mid and high level moisture from the remains of Olaf will move over California Tuesday into Early Wednesday.   The Dweebs take,  on the QPF will be a blend of the GFS and ECMWF. Amount look to be about .25 to as high as .50 over the upper elevations. The snow level will be pretty high, generally above 8500 feet. Cooler air following the trof will allow the freezing level to come down a little Thursday, after most of the precip is gone.

Next week,

The high country will have it first real taste of cold weather with a cold digging Sierra Slider early next week. So far this next system is progged to have an over land trajectory.  Thus, it should not be a major precip producer. But it looks to be mostly snow in the Town of Mammoth Monday and Tuesday.  This is actually a good storm to get the snow making going on Mammoth Mt as temps at 700MB are currently progging between -6 and -7C, or around 20F degrees.   The Dweebs will have a better idea on snowfall amounts Thursday or Friday….  Light to possibly moderate amounts are in the cards….


Dr Howard and the Dweebs……………………..:-)

Storm Clouds Clear Out to leave cool crisp morning in Mammoth with Icy Conditions and Clear Skies…..Westerlies continue to slowly strengthen as well as El Nino…..The week ahead looks seasonal and dry….However….Toward the end of next week, Stormy….

Sunday Evening…


Chatted with one of the Leed’s this morning and the upshot was that too much is going on at this time to make an accrete QPF forecast for the Wednesday night-Friday system. There are two tropical storms out over the pacific. One that is phasing with the westerlies over the western pacific, but that should be well into the guidance by tomorrow AM.  Over the eastern pacific, tropical storm Olaf is being picked up by the next wave approaching the west coast.

I will make a guess at this point but there is not a great amount of confidence. Maybe by tomorrow morning things will be different?

For what ever it worth, it appears that chances are decent that some light snow to fall…..between Wednesday afternoon through Friday night.  The snow level will begin about 8000 to 8500 feet Wednesday night but will come down Thursday and down further Friday/Ngt. The wettest model tries to bring in close to an “inch of QPF” over the west side of the sierra, over the 3 day period Wednesday night through Friday night. The driest model brings in about .25 during the same period. That is quite a big spread but that is what I am working with.   October is a tough month for forecasting….It should be easier later in November though the Winter. Next update in the morning…

Longer range is not convincing enough to get excited about anything yet…..However,  hemisphere is chilling fast and so it is just a matter of a few weeks to start seeing in the models some significant storms headed for the west coast….


OCTOBER 24th Update:

Models are diverging from earlier prongs for a storm capable of delivering several inches of snowfall to the eastern sierra. I still expect some light snowfall Wednesday over the higher terrain but it is not looking as favorable now as 3 days ago.


I will have a complete update Sunday on next weeks weather and beyond…


The Dweeber…………………………….:-)


Oct 21st, Wednesday AM:

There appears this morning, to be the possibility of a decent storm, sometime between next Wednesday and Halloween.

Here are the ingredients:

  1. Typhoon Champi was located some 500Mi  due south of Tokyo this morning
    A. Over the next 5 days Champi will be totally extra tropical and merging with the westerlies as it moves NE
  2. A moderate trough will move off the Asian coast this Saturday AM and constructively phase with Champi over the following 24 hours building a strong ridge down stream on a longitude between the Dateline and the Hawaiian Islands.
  3. That amplified ridge deepens a new trof down stream over the East Pac tapping cold from the GOAK.
  4. This eastern pacific trof entrains now Hurricane OLAF as a extra tropical storm which spins up the jet in the negative tilt system. This builds an upper ridge over the pacific NW while the upper trof digs into California “”About”” next Thursday the 29th.  This timing is subject to the scenario over the western pacific.
  5. Climo wise, this will bring the possibility of our All Hallows eve storm, even through the storm may come a day or two sooner. The models also suggest that the leading trof may be just the 1st in a series into that following 1st week of November.

Wednesday PM Update:

It should be noted that in advance of the system next week, there is a mid latitude upper low north of Hawaii this afternoon that will bring clouds and possibly some showers this Sunday….



Once again another interesting 5 day period of weather over the southern half of the state of CA. Precipitation amounts ranged mostly between 1.25 to 2.00 inches in the sierra with some isolated amounts of 3.00+ inches, especially in the mountains north of Santa Barbara.  The weather has been greatly influenced by the highly anomalous sea surface temps off the Southern California Coast this Summer, and now Fall. The positive phase indices of the PDO for the month of September reached 1.95. Comparing that to September of 1997 was 2.19.  A moderate weakening began in October of 97, before rapid weakening the end of that year.  The PDO in its positive phase is responsible for a lot of heat in the oceans along the west coast the past 12+ months. Oceanic Kelvin Waves have added to that heat this year allowing SSTA to reach record levels west of Southern CA beaches.  Sea Surface temps according to buoys, recorded temps just over 80F is some cases this past September.

The Quite Giant:

El Nino’s effect upon our current weather is quite incipient now compared to what is likely to happen this Winter as the East Asian Upper jet strengthens and migrates south and splits eastward from the Subtropics.  Its split southern branch associated with the +PNA teleconnection pattern will likely bring a lot of beneficial rains to the Southern half of our state.  In the case of strong El Niño’s like this one, even the more northerly portions of the state that are often times absent from the effects of El Nino’s wet pattern may benefit.



The Dweebs are following the RIMM phase space that are at least suggestive of a strong MJO to develop over the Indian Ocean with the potential to flip the PNA to negative in the coming weeks. . As mentioned in my last discussion, there appear to be an emerging signal over the east coast of Africa in the Eastern Indian Ocean. As of late, the Ensemble Global Forecast System may be hinting at an Equatorial Rossby Wave or tropical Storm or KV  because of the emergence is followed by an Eastward shift with the convection. That is not all that encouraging….

The ECMF is progressive and needs to be followed…..As strong Convection between 70E and 100E over the Indian Ocean is often associated with a flip in the PNA to negative and long wave trofing over the Eastern pacific. This looks like sometime between week 2 and 3.  I will update Wednesday AM after the CPC update….


As mentioned last August, the warm water along the west coast is reminiscent of the winter of 1957-58 El Nino year. However, the strength of El Nino this year is stronger, but the SSTA structure along the west coast is similar. That allowed a winter of 140% of normal to Mammoth Lakes. With as much energy (Heat) that is trapped in the tropical oceans over the EQ eastern pacific, there is likely going to be some pretty intense precip events this winter. The CFS VS2 is calling for a November that has normal amounts of precipitation for Mammoth Lakes. December on through the Winter is expected to be much wetter than normal.  I have given up on following the ECMWF monthly guidance for precipitation as it preformed so poorly last winter and several winters back.  To me it does not make much sense to try to predict 3 months of precipitation on a monthly basis, let alone a month’s worth of precip for area’s like Mammoth Mt, when you have to consistently update those figures during the month. The best forecasts will be the ones with the best guidance 7 to possibly as much 10 days out, once we get into the meat of the winter.

Although, this winter looks quite wet snowfall wise with snow to ratios low, and the likelihood of the Platinum Powder Criteria not being reached until late winter like late February or March.  Nevertheless the Dweebs will still hope for a good cold one at some point!   In the meantime, for those that have signed up for the Platinum Powder alert system, I will make good use of email by offering you all some very good forecast information well before the weekends, so you can plan accordingly before coming to Mammoth. In addition, if the Dweebs see an opportunity to advise for a Platinum Powder advisory or alert, you will benefit from the timing to cut up some amazing powder……  As a reminder, Platinum Powder criteria is 12 inches or more of light snowfall which for the majority of it is at ratios of 15 inches of snow to one inch of water at 10,000 feet and above….


Dr Howard and the Dweebs……………………..:-)