Chalfant Valley, California 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

684
FXUS65 KREV 271950
AFDREV

Area Forecast Discussion
National Weather Service Reno NV
1250 PM PDT Sun Apr 27 2025

.KEY MESSAGES...

* Lingering showers with a few thunderstorms over northwest NV
  will diminish this evening.

* After a chilly start to the week, a warming trend begins with
  mainly dry conditions through Tuesday afternoon.

* Shower and thunderstorm chances return by midweek, with
  increasing potential for another cooler and showery storm by
  next weekend.

&&

.DISCUSSION...

Another round of steady precip last night into this morning
produced a few more inches of snow for the Tahoe basin and parts
of northeast CA, with up to 8 inches for higher Sierra peaks. Snow
amounts were lighter and more spotty across Mono and Mineral
counties. Decent wetting rain fell across areas mainly north of
I-80, with a swath of northeast CA and northwest NV receiving
between 0.50 and 1 inch of rainfall since Saturday evening.

The cold upper low that brought this late April rain and snow will
exit into Utah tonight, with showers decreasing across most areas
this afternoon. The final bands of showers with embedded thunder
over west central NV mainly east of US-95 wind down this evening.
Overnight clearing then leads to chilly temperatures with some
rural valleys in western NV/eastern CA dropping below freezing
early Monday. Areas of freezing fog are likely to develop
overnight in fog prone valleys of northeast CA, including the
Martis Valley/Truckee area and Sierra Valley in eastern
Sierra/southeast Plumas counties.

Afternoon highs will rise back up closer to late April averages
(lower-mid 60s for lower elevations and mid 50s for Sierra
communities) by Monday afternoon, with another 4-8 degrees of
warming for Tuesday. Dry conditions will prevail Monday through
much of Tuesday afternoon, although a weak shortwave passage will
bring another chance of light rain showers mainly to northeast
CA/northwest NV Tuesday evening and night.

This system then drops farther south into central/southern CA
for Wednesday-Thursday, with increasing instability leading to
showers/isolated thunder mainly near the eastern Sierra and parts
of western NV south of US-50 each afternoon, with higher potential
(20-30% chance) on Wednesday. These shower and thunderstorm
chances then expand to much of eastern CA/western NV Friday
afternoon-evening as a more organized Pacific storm approaches
the west coast. Temperatures will reach their warmest levels by
late week with highs into the mid-upper 70s for lower elevations
and 60s for Sierra communities, and increasing SW winds Friday.

As we get to the first weekend of May, latest blended guidance
continues trending toward another colder upper low moving across
CA/NV. This storm may be similar to this weekend`s system,
dropping temperatures below average with scattered showers and
possible embedded thunder again. Travel impacts over Sierra passes
could again arise next Saturday night/early AM Sunday, as latest
projections dip snow levels to 5000-5500 feet. MJD

&&

.AVIATION...

Overall conditions will improve as the weekend storm exits, with
terrain obscuration as the main effect through the rest of the
day until the low cloud deck breaks up this evening. A few
leftover -SHRA/-SHSN could bring brief MVFR conditions to
KTRK/KTVL thru 00Z. W-NW wind gusts of 20-25 kt are expected
through this afternoon at the main terminals, then diminish early
this evening after 02-03Z.

As skies clear out tonight, FZFG will develop and produce LIFR
conditions at KTRK mainly between 06-16Z but it could begin to
form prior to 06Z due to abundant ground moisture. Another round
of FZFG is likely at KTRK Monday night thru early AM Tuesday,
although onset of the fog should occur a few hours later compared
to tonight.

Otherwise for Monday-Tuesday, VFR conditions prevail at the main
terminals with generally light winds (gusts below 20 kt). MJD

&&

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

$$