Dry Valley, Nevada Weather Forecast Discussion

676
FXUS65 KVEF 270916
AFDVEF
Area Forecast Discussion
National Weather Service Las Vegas NV
216 AM PDT Sat Sep 27 2025
.KEY MESSAGES...
* Chances for isolated to scattered showers and thunderstorms will
  continue through the weekend across southern Nevada, northwest
  Arizona, and southeastern California.
* Moisture will gradually decrease next week as a low pressure
  system approaches West Coast, bringing breezier winds and
  helping cooler than normal temperatures hang around through the
  week.
&&
.DISCUSSION...through next Friday.
The low pressure system responsible for the showers and
thunderstorms of the past few days will continue to sit and spin
over southern California, southern Nevada, and western Arizona
through the weekend. This system, combined with above normal
moisture, will drive isolated to scattered showers and thunderstorms
across the region today and tomorrow. Moderate-to-heavy rain, flash
flooding, strong outflow winds, hail as big as 1 inch, and frequent
lightning will be hazards with any storms that develop. Storms will
begin to push into southern San Bernardino and Mohave Counties early
this morning with additional storm development spreading later in
the morning and into the afternoon as daytime heating gets going.
The greatest risk for flooding will be across southern San
Bernardino County into Mohave County where stronger storms will be
capable of producing 1.0+ inch per hour rain rates. Convection will
weaken after sunset, however, some areas will see weak, isolated
showers and thunderstorms continue into the overnight hours as the
low remains stationary to our south. Another round of storms is
expected on Sunday, but coverage will be less expansive as we find
ourselves on the back side of the low as it starts to exit the
region.
The low pressure system will begin its slow exit from the Desert
Southwest on Sunday, lifting out of the region on Monday as a trough
pushes into the Western US. This will result in breezy winds across
the region with isolated showers possible on Monday and Tuesday
across northwestern Arizona and the Great Basin as this system
pushes in. As we find ourselves under southwesterly flow aloft, we
will see moisture gradually scoured out. However, it is important to
note there remains some uncertainty regarding how quickly we will
dry out as it will depend on how much moisture from Hurricane Narda
in the East Pacific ends up getting advected into the area during
the second half of the week. Regardless of what happens with
moisture from Narda, the lower than normal 500 mb heights will allow
cooler than normal temperatures to stick around through the end of
the week.
&&
.AVIATION...For Harry Reid...For the 06Z Forecast Package...Light
winds will continue through Saturday morning, with winds expected
to shift to the east-southeast around 8KT through the afternoon.
Another round of scattered showers and thunderstorms is expected
during the afternoon and evening, with erratic gusty outflow
winds, frequent lightning, and MVFR/IFR conditions in heavy rain
will accompany storms that develop across the area. However,
precise timing of storms impacting the terminal remains in
question, though the most likely window will be late afternoon and
early evening. By mid to late evening, the thunderstorm threat is
expected to diminish, with lingering showers and light and
variable winds thereafter. Outside of storms, VFR conditions
prevail with SCT-BKN ceilings around 10-12kft.
For the rest of southern Nevada, northwest Arizona and southeast
California...For the 06Z Forecast Package...Showers and
thunderstorms have diminished this evening, with light winds
through Saturday morning. Another round of storms is expected
across northwestern Arizona, southern Nevada, and portions of
southeastern California during the afternoon and evening, possibly
by late morning across the Lower Colorado River Valley. Erratic
gusty winds, heavy rain, and frequent lightning are concerns, with
blowing dust also possible along outflow boundaries. While a
majority of thunderstorm activity diminishing by late evening,
lingering showers are expected into the night across southern
Nevada and northwestern Arizona. Away from storms, winds will
generally be around 8KT or less, shifting to the southeast by
Saturday afternoon. In the Owens Valley, dry conditions are
expected with gusty up-valley winds late afternoon through the end
of the period. VFR conditions with ceilings around 10-12kft will
prevail.
&&
.SPOTTER INFORMATION STATEMENT...Spotters are encouraged to report
any significant weather or impacts according to standard operating
procedures.
&&
$$
DISCUSSION...Stessman
AVIATION...Phillipson
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NWS VEF Office Area Forecast Discussion