Lee Vining, California Weather Forecast Discussion

599
FXUS65 KREV 271930
AFDREV
Area Forecast Discussion
National Weather Service Reno NV
1230 PM PDT Sat Sep 27 2025
.KEY MESSAGES...
* A few showers and thunderstorms in the Eastern Sierra south of
  Tahoe this afternoon, with storm chances expanding Sunday into
  Monday into portions of western Nevada.
* Significantly cooler, with gusty winds and periods of showers much
  of the next work week.
* A drying trend is on tap for late week into next weekend, though
  temps will remain below normal.
&&
.DISCUSSION...
* Moisture bands wrapping around an area of low pressure centered
  over the SoCal/Arizona border will bring 15-30% chances for
  showers and thunderstorms this afternoon, primarily in the eastern
  Sierra south of the Tahoe Basin. High resolution forecast
  simulations are pointing toward showers continuing for southern
  Lyon, Mineral, and eastern Churchill Counties overnight.
  Elsewhere, it will be warm and dry today.
* A robust early fall storm originating in the eastern Pacific
  will bring a significant cool down, along with gusty winds and
  periods of showers to the region through much of next week.
  Southwest winds will begin to increase Sunday afternoon, with
  the strongest winds Monday and Tuesday due to a pair of cold
  frontal passages. Instability ahead of the front will help to
  produce increasing shower and thunderstorm chances across much
  of western Nevada, predominately near Alt-95 eastward,
  stretching south into the Eastern Sierra of Mono Co. The
  enhanced shear from the upper level jet, in particular on
  Monday, will help to organize and strengthen thunderstorms in
  western Nevada. Otherwise, there will be periods of showers
  across the region throughout the week. The highest probability
  for wetting rains (0.10"+) will be in the northern Sierra,
  northeast CA, and far northern Nevada into central and eastern
  Nevada. We may even see some light snowfall along Sierra peaks,
  as snow levels dip to around 9kft at times.
* Temperatures will be significantly cooler than what we have seen
  as of late, roughly 10-15 degrees below normal, or 50s and 60s
  in Sierra valleys, and 60s to around 70 in western Nevada
  valleys. Overnight lows will dip below freezing in most Sierra
  Valleys Tuesday-Friday morning next week, with upper 30s to mid
  40s for most of western Nevada. If you live in a known cold
  spot, you may want to turn off your irrigation.
* General troughiness remains over the west, with additional
  shortwaves rotating into the main trough into next weekend.
  While it doesn`t look particularly wet, it will keep
  temperatures below normal. -Dawn
&&
.AVIATION...
* There`s a 20% chance for a shower or thunderstorm to impact KMMH
  this afternoon between 21z-02z. Developing cumulus clouds may
  obscure mountain tops in the vicinity of the airport during this
  time frame as well. Overnight, showers may persist from KMMH-
  KYER- KNFL, but will be isolated in nature. Elsewhere, VFR
  conditions will prevail with light NE breezes this morning
  becoming W/SW this afternoon between 23-01z with speeds reaching
  up to 15 kts at terminals.
* Increased shower and thunderstorm activity Sunday and through
  much of next week with a strong area of low pressure moving into
  the region. Winds will also be on the increase, esp
  Monday/Tuesday with a pair of cold fronts, leading to LLWS and
  mountain wave turbulence concerns. Ceilings will be lower with
  terrain obscurement likely. -Dawn
&&
.REV Watches/Warnings/Advisories...
NV...None.
CA...None.
&&
$$

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