Archive for January, 2023

Coldest Weather of the year expected tonight with most areas of Mono County near or Below Zero…..Moderating temperatures expected mid week with seasonal temps by the weekend…..Next Weather System Friday weakens then Snow possible again by Sunday….

For Mono County, it will be one cold night tonight. (CPK) Continental Polar that has been modified a bit has moved into Mono County last night. This will result in high temps in the mid teens today and lows near zero tonight.

The weather system that brought 4 inches of Platinum Powder yesterday was off the coast of Southern California this morning. Short Wave ridging in its rear will settle the cold into the high elevation valleys of Mono County tonight for Classic “Three Dog Night” conditions!  Expect lows tonight between -20F and -27F in the coldest valleys such as Long Valley and Bridgeport Valley.

Our Old Friend “The Hudson Bay Low” will greatly limit precipitation for the Friday storm as its position over Hudson Bay (PV) keeps strong ridging over the far west.  That will weaken the Friday system and so don’t expect much more than a dusting or and inch or two at the most after midnight Thursday night into Friday AM.   By Friday, the Hudson Bay (PV) shifts rapidly east so that by Saturday AM, it is off the coast and out over the Atlantic. This opens the storm door for the Sunday Morning system. That storm looks to be with us into Monday morning. At the moment, it appears to be a storm of moderate strength, capable of about 12 to 18 inches over the crest with roughly 1/2 of that in town by Monday the 6th. The weather may turn colder after that storm with the next system more of a slider. As a note, later that week the Eastern Pacific Ridge is flat, north of Hawaii. So we are not out of the woods yet for other storms in the future. Just need some amplification to get it all going again!


Dr Howard ad the Dweebs………………………:-)

An end to Mono Lake Fog late this weekend…..Coldest Air of the Season early next week….La Nina Pattern is Back…Mono Lake Fog to return next week…..



This mornings global model runs show some interesting changes for the first half of the month of February.  Here is what the Dweebs see.

  1. At this time, the Hudson Bay Low (Canadian Polar Vortex) has become very strong and deep. It is tied in with the strong, highly amplified ridge over the Eastern Pacific. This pattern is very common during La Nina winters where-by it is colder than normal in the west and central and at times eastern portions of the US. This pattern is a blocky pattern over the Eastern Pacific keeping out any big storms from affecting the central west coast. The system for Sunday into early Monday is classic!  Cold system with light snowfall and upslope as well.
  2. So here is the upshot of this AMs post in getting all the ducks lined up again!
  3. The Hudson Bay Vortex is forecasted to begin progressing east, just before Ground Hogs Day Thursday.  The Dweeb’s are not sure why as the Eastern Pacific upper block actually starts to break down 1st over the Eastern Pacific, this upcoming Monday.  This eastward shift of the Vortex opens the wave length between the eastward shifted Vortex near Newfoundland and the retrograding high over the Central Pacific.
  4. Additionally, the Atlantic Ridge, east of Iceland is beneficially located. This positive height anomaly is also suggestive of a pattern that is progressive as well.
  5. The next storm track does not appear to have any significant AR’s associated with it. These look to be mainly light to at times moderate snow producing storms for Mammoth. Some storms will be very cold! (Lots of cold powder)
  6. More Later…..

Preliminary snowy dates “subject to change“;  Feb 3rd; 5th and 9th.

Dr Howard and the Dweebs…………………….:-)



After an El Nino like pattern in December and January, the Northern Hemispheric Pattern has once again shifted back to La Nina. After a shot of cold water emerged over the Central Pacific due to enhanced trades, this has had the affect of returning our pattern to one of colder than normal with drier than normal conditions for California.

According to the Climatic Prediction Center, A transition from La Niña to ENSO-neutral is anticipated during the February-April 2023 season. By the Northern Hemisphere Spring (March-May 2023), the chance for ENSO-neutral is 82%.

So might this resurgence of La Nina and its associated pattern be the last?   Will See!

Weekend storm:

For the past 24 to 36 hours, the global models have been back peddling on the precipitation forecast for Mammoth Lakes and Mammoth Mt.  Here is the latest 12z/4:00AM updates.

The main differences between the GFS and European models is this;

The Euro is just slightly slower and colder than the GFS and has a little more snowfall for our area.  And….The upper low has no over water trajectory now, and the upper jet is off shore, and more NW oriented.

Both models agree that this system is much drier now with snowfall amounts for Mono County in the 1 to 6 inches range by Late Sunday night. 700MB temps go down to -16C Monday AM. That’s 3 degrees F at 10,000 feet Monday AM in Mammoth, free air conditions.

With Inversions setting in quickly Monday into Tuesday, Bridgeport Valley may go -25F Tuesday AM. Freezing Fogs to return next week for Lee Vining as well.

Longer Range:

We will continue with a hemispheric pattern associated with La Nina. Weather systems seem to be pretty tame through mid month. There is a small system on the 3rd and another small system on the 9th. Both are in the 1 inch to as much as 6 inches category.


Dr Howard and the Dweebs………..:-)


Strong Wind Chills of yesterday have abated while warming today will push highs into the mid 30s!….This weekend will be Breezy or Windy with the chance of Snow…..


Wednesday AM update;

Model runs still look good but not as wet with the Sunday-Monday system. About .75 of an inch of QPF looks good for the Sierra Crest. This means a good foot of snow at the higher elevations as snow to water ratios by Monday afternoon, 15:1 or better. Modified Arctic Air is still being pulled SW from Central Canada for a very cold early next week. Mondays highs could be in the teens in town, with below zero temps Monday night. This is a classic response to La Nina which has strengthened a bit in the past week or so.


Longer Range:

I have posted the MJO and Phase Space RMM for your perusal.

It suggests that an extended dry period is ahead of us through the middle of February. If the GEFSv12 Extended verifies, Phases 4, 5 through mid 6 are pretty dry for us. See the lag graphic and RMM chart. Each Lag is a period of 5 days. It suggests that the Pacific does not open up until the 3rd week of February into March….If the MJO remains strong, that would be our next real wet period.  With that said, this is subject to change if the MJO weakens.



SEE Graphics Below:



Today is Tuesday and the Global Models seem to coming together with a rather cold pattern the end of this weekend into Tuesday.  The upper ridge in the Gulf of Alaska is being amplified by a “Super Bomb” spinning up off the coast of Japan this morning. and another few others following on its heals. WOW!   The cold upper Vortex associated with these surface systems has a center of 489MB just crossing into the Sea of Okhostsk. There is another in back of it, headed for the Aleutians. Through the process, a massive amount of high pressure will build down stream over the Gulf of Alaska as its punched toward the North Pole. The down stream effect, is of pulling down a lot of Arctic Air over Western Canada with even a tug of Continental Air from Hudson Bay as well.  This system is in two parts with a chilly one coming through Friday Night, mainly to the NE of us. A colder one Saturday Night into through Monday night. That one shows over water trajectory and so snowfall is expected within that time period. The system Sunday into Monday will bring a good foot of Platinum Powder. All this if the new European Model runs verifies.

QPF from EURO shows possibly a foot+ of snow, 15:1 to 20:1 by Monday night.    700MB temps are expected to get down to -18C. That means highs in Mammoth about 10F-15F degrees Monday.  This would be Bugaboo, Canada powder.


Note:  This pattern is still a bit of time away…Stay Tuned!


Dr Howard and the Dweebs…………….:-)