Thursday was my last day in the field before a well-advertised storm was to drop 1–3 feet of snow in the Mono Basin. As I drove down to Rush Creek, the winds were picking up, snow was blowing off Sierra peaks, and lenticular clouds graced the late-afternoon skies.

Rush Creek bottomlands, a day before the storm hit.

The Los Angeles Department of Water & Power (DWP) had just lowered the flows in Rush Creek and Lee Vining Creek, and I was checking to see if certain side channels were still flowing, as well as checking on a few other things before the expected deep snow made travel to the streams difficult. (more…)

October 2010, the Mono Basin’s warmest October since 2005, set a new record for precipitation in Lee Vining: 3.74 inches! With data going back to 1988, last month beat the old record of 2.41 inches set in 1992 by 1.33 inches! It also beat the 1950-1988 October precipitation record from the Mono Inn, the previous home of our weather instruments (5 miles north). Median October precipitation in Lee Vining is 0.23 inches, usually our third driest month after June and July.

At Cain Ranch, just five miles south but slightly drier, 3.11 inches of rain set a new record going all the way back to 1931! (more…)

October 1, 2010 was the first day of the 2011 Water Year—Happy New Year! A Water Year in the Mono Basin runs from October 1 to September 30th. This lumps the winter’s precipitation into the same year as the following summer’s runoff, as well as the next year’s growing season.

The 2010 Water Year (October 1, 2009 — September 30, 2010) was near-normal (more…)

It has been an unusual summer for water. With just 104% of average runoff forecasted for the Mono Basin, sudden warmth the first week in June brought peak flows down the creeks more typical of a wet year. But despite the high flows in the creeks during June and July, the total volume is not representative of a wetter year.

Grant Lake Reservoir spilled from July 3rd until the (more…)

On Saturday July 3rd, Grant Lake Reservoir began spilling for the second time since the year 2000–it also spilled in 2006 after filling up in 2005.

Inflow is dropping as the melting snow runs out, although the warm weather is melting higher elevation snow, which could maintain high inflow for a few more days. Outflow is declining as well after peaking this morning at about 460 cfs (cubic feet per second). The spill peaked at 171 cfs on Thursday and Friday last week, but LADWP was still increasing the flow in the MGORD (Mono Gate One Return Ditch) until this morning. LADWP installed pumps at the spillway in order to ensure it would (more…)

Water cascades over the Lundy Lake Reservoir spillway on its way down Mill Creek to Mono Lake. Photo by Sarah Melcher.

I grabbed the flow meter and eagerly drove out to Lundy Canyon, where our beloved Mill Creek runs in its complicated course to Mono Lake. As the intern assigned to monitor Mill Creek this summer, I got to be one of the first people to see Lundy Lake Reservoir spill into the usually less-than-full creek bed.

Typically, Mill Creek is diverted at Lundy Lake to the SCE power plant. Some of that water is then diverted for delivery to water rights holders, but (more…)

May 2010 was almost as cold as May 1998. The average temperature this May was 46.6 degrees F, making it the second-coldest May in Lee Vining since weather records started in 1988. It also set a new record low, 20 degrees, 1 degree colder than the previous May record in 2000. The average minimum temperature of 33.9 also set a new record, beating 1998′s 34.16.

Eight daily records were set last month, with seven of them broken the week of the 23rd through the 29th. Four days set new records for the lowest maximum temperature and four set new records for the lowest minimum temperature ever recorded in (more…)

Mono Lake
On April 1st, 2009 (the beginning of this Runoff Year), Mono Lake was at an elevation of 6382.5 feet. It dropped about a foot by the end of the calendar year, and in January and February it rose half a foot, for a net loss of 0.6 feet since last April 1st. The half-foot rise in January and February is the largest 2-month wintertime rise since a 0.6 foot rise in January and February 2006. Mono Lake usually rises 0.1 foot in March–if it does that this month, we should be looking at an April 1st level of about 6382.0 feet. Click here for more on Mono Lake’s levels.

Lee Vining Precipitation
Here in Lee Vining, from October through February we’ve received 11.72 inches of precipitation, which is 108% (more…)

Howard Schekter, our local Mammoth weatherman, says

“THIS EVENT HAS THE POTENTIAL TO APPROACH OR RIVAL THE JANUARY/FEBRUARY 1998 EL NINO EVENT IN CENTRAL CA AND THE JANUARY 1995 TIME FRAME FOR SOUTHERN CALIFORNIA.”

The National Weather Service in Reno has issued a Special Weather Statement that includes

“THE COMBINATION OF SNOW AND WIND IN THE SIERRA MAY CAUSE SIGNIFICANT TRAVEL DELAYS AND PERIODIC ROAD CLOSURES.”

The following email we just received from the USGS through our contacts with the Forest Service (original email appears to be from Chris Haile with CalFire). It has been reposted on several other blogs (more…)

I just read Bartshe’s post about the NASA study showing that Mono Lake’s July-September surface temperature warmed about 4 degrees from 64 degrees F in 1992 to 68.3 degrees F in 2008. The article suggests comparing the water temperatures with air temperatures, and I have just done that with the results shown below. (more…)