Markleeville, California Weather Forecast Discussion

621
FXUS65 KREV 250906
AFDREV
Area Forecast Discussion
National Weather Service Reno NV
206 AM PDT Thu Sep 25 2025
.KEY MESSAGES...
* Shower and thunderstorm chances today, mainly south of I-80.
* Another low pressure system early next week brings potential for
  cooler temperatures, increased shower chances, and breezy
  conditions.
&&
.DISCUSSION...
Showers are already beginning to circulate over the Sierra, with
heavy showers containing lightning appearing over the Central
Valley of California early this morning. We expect this to
continue today, with showers filtering in and becoming more
numerous by afternoon. The primary areas that can expect heavy
rains will be for Mono County along the Sierra crest, where precip
chances rise to 70-80% this afternoon. Showers may be found as far
north as I-80, but the chances along and south of I-80 are much
lower, around 10-20%. The gradient for the greatest chances drapes
along US-50, with lesser chances to the north and highest chances
to the south. As this cut-off low meanders across California and
Arizona for the next few days, we expect shower chances to
continue.
For now, Friday is advertised as a relatively dry day, with
showers returning for Saturday. This forecaster believes that is
subject to the relative position of the low, and therefore won`t
rule out a stray shower in far southern Mono County for Friday.
Chances return on Saturday, but the bulk of the precipitation will
once again be found along the similar areas as today`s rains, but
the chances are far less. We only see a 20-35% for showers and
storms, still held mostly south of US-50. Sunday, we round out the
weekend with increasing chances and more widespread showers,
bringing potential northward. The cut-off low is still the source
of these showers, but an incoming frontal boundary will join the
party.
Monday we start to see influence from the trough that is currently
developing over the northern Pacific, which will draw in some
colder air from the north. Breezy winds will increase, especially
along the ridges, where gusts may reach 60 mph, while valley gusts
could reach 35 mph. Showers look to continue into midweek, and
may include snow above 10,000 feet by Tuesday morning. Chances
dwindle for Wednesday and Thursday, with a few areas still
looking at chances of 10% as the system moves into the
Intermountain West. HRICH
&&
.AVIATION...
* Showers will increase this morning, affecting Sierra terminals
  as early as 12-15Z. KMMH may see MVFR as day breaks, with
  showers and storms moving north by 18Z for KTVL/KMEV/KCXP.
  Chances for showers will approach 75-80% for KMMH, while
  KTVL/KCXP/KMEV have afternoon chances as high as 25-35%. KRNO
  will see chances increase through the day, and arriving around
  20Z. Main hazards will be heavy rains, possible small hail,
  lightning, and terrain obscuration.
* Chances will taper as the sun sets this evening, with much drier
  conditions for Friday.
-HRICH
&&
.REV Watches/Warnings/Advisories...
NV...None.
CA...None.
&&
$$

NWS REV Office Area Forecast Discussion