Sun Valley, Nevada 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

764
FXUS65 KREV 242120
AFDREV

Area Forecast Discussion
National Weather Service Reno NV
220 PM PDT Tue Jun 24 2025

.KEY MESSAGES...

* There is a slight chance for afternoon showers and thunderstorms
  near the Sierra crest from the Tahoe Basin southward through this
  evening.

* Generally dry conditions are expected through the remainder of the
  week with elevated fire weather concerns on Wednesday and Thursday.

* Temperatures return to seasonal averages on Wednesday, then rise
  to above average this weekend.

&&

.DISCUSSION...

The latest RAP analysis of the upper air pattern shows the axis of
an upper air trough over central NV this afternoon yielding a north-
northwesterly flow over the CWA. Current surface observations and
satellite imagery report dry conditions across the CWA with
afternoon clouds continuing to develop particularly along the
Sierra. CAMs are showing a slight (10-15%) chance for showers and
isolated thunderstorms mainly for the Sierra from the Tahoe Basin
down to Mono County from around 3-8 PM PDT. While severe weather
is not anticipated today, cloud-to-ground lightning and some
gusty winds are possible hazards should a thunderstorm occur
today. Please continue to be weather aware if outdoors today so
that a storm does not sneak up on you. Area low temperatures
tonight expect to be in the 40s and 50s.

Tomorrow, a west-northwesterly zonal flow moves over the area
with models showing the aforementioned trough departing to the
east. As temperatures continue their warming trend, dry conditions
are on tap for the middle of the week. Daytime highs expect to be
in the upper 80s to lower 90s in the valley areas while the
Sierra communities will see highs in the middle 70s to lower 80s
on Wednesday. Afternoon zephyrs gusting up to around 25 mph look
to return tomorrow and Thursday which in conjunction with low
relative humidity values will cause elevated fire weather
conditions in the CWA and possibly an hour or two of locally
critical conditions in Lassen and northern Washoe Counties on both
days.

The forecast shows temperatures continuing to climb going into the
weekend before peaking to begin next week. While daytime highs in
the Sierra communities look to reach the 70s and 80s by the weekend,
high temperatures in the 90s are forecast for valley areas by the
weekend with the potential for some portions of western NV (like
those around Fallon) potentially hitting the century mark on
Sunday and Monday. The latest NBM probabilities show around a
40-60% percent chance for 100 degrees or more in eastern portions
of the CWA. As such, the latest HeatRisk assessment shows the
current CWA-wide minor HeatRisk starting to introduce some spots
of moderate HeatRisk in western NV on Friday and Saturday before
growing in area by Sunday and Monday. Please consider preparing
for these hotter and above normal temperatures now if you can as
this amount of heat can affect those sensitive to heat should they
not have adequate cooling or hydration. While the general dry
pattern looks to persist, daytime heating later in the week may
allow for some pop-up showers and thunderstorms during the
afternoon hours, but there is low forecast confidence this far out
to pinpoint the details. -078

&&

.AVIATION...

VFR conditions are anticipated to persist for the rest of the day
and going into tonight with afternoon breezes becoming light
around 04Z-06Z. There is a 10-15% chance for showers and isolated
thunderstorms later this afternoon going into the evening
(22Z-03Z) for Sierra areas around the Tahoe Basin south through
Mono County. If showers or storms develop in the Martis Valley
later this afternoon, there is a chance for fog at the KTRK
terminal. Will monitor for this and adjust TAFs as needed.
Generally dry conditions are expected through the rest of the week
with area temperatures continuing to warm up. -078

&&

.REV Watches/Warnings/Advisories...
NV...None.
CA...None.
&&

$$