Boulder City, Nevada Weather Forecast Discussion

832
FXUS65 KVEF 271927
AFDVEF
Area Forecast Discussion
National Weather Service Las Vegas NV
1227 PM PDT Sat Sep 27 2025
.KEY MESSAGES...
* Isolated to scattered showers and thunderstorms will continue
  through Sunday across southern Nevada, northwest Arizona, and
  southeastern California.
* A low pressure system approaching the West Coast Monday will bring
  breezier winds and drier air. Temperatures will climb back to near
  normal for the end of September and beginning of October.
&&
.DISCUSSION...through next Saturday. Midday satellite loop showed
the cutoff low which has been our main weather player for a while
centered near the Riverside/Imperial county line. Area radars showed
thunderstorms beginning to increase in coverage while moving
counterclockwise around the low center. The greatest thunderstorm
coverage was southeast of I-15, and the strongest storms thus far in
our CWA were in southeast and far southern San Bernardino County.
High resolution models are verifying pretty well thus far, and show
storms continuing to expand farther north and increase in coverage
through the afternoon before diminishing overnight. Erratic gusty
winds, heavy rain, and hail will all be in play through the
afternoon. Sunday, low pressure digging down from the Gulf of Alaska
should get close enough to exert some influence on the cutoff low
and start pushing it away. As the low slowly begins to lift
northeast, thunderstorm chances will follow it, and should be
limited primarily to Mohave, Clark, and Lincoln counties. That being
said, if the low is any slower to move than anticipated, storm
chances could stay farther southwest during the day. By Sunday
night, the formerly cutoff low should be out of here, and the
aforementioned Gulf of Alaska low should be nearing 130W as a full-
latitude trough. As this trough swings inland, it will bring small
chances for showers and thunderstorms to the Sierra Nevada and the
higher terrain of the southern Great Basin Monday and Tuesday. It
will also produce breezy southwest winds over much of the CWA, which
would normally flush out all the residual moisture, but this time
could be a little different. Hurricane Narda (which should be a
remnant low by Tuesday) could inject a little moisture into the
trough (not enough for thunderstorms in our area, but maybe enough
to prevent dewpoints from crashing) if it moves northward quickly
enough. However, if it is too slow in its northward trek, the trough
would bypass it and dry us out more efficiently. Late in the week,
the next trough in the westerlies could reach the West Coast, with
too much model spread to pin down any details yet. The atmosphere is
beginning to look like autumn.
&&
.AVIATION...For Harry Reid...For the 18Z Forecast Package...Outside
of thunderstorm influences, expecting light winds that follow
typical, daily patterns. Scattered showers and storms are expected
this afternoon and evening, with the best chances between 21z and
03z. Storms will likely contain erratic and gusty outflow winds,
frequent lightning, and brief MVFR/IFR conditions within heavy rain.
Thunderstorm potential should wane after sunset, but scattered
showers may linger into the night. Cloud bases generally 8-12kft
throughout the period, with SCT-BKN conditions this afternoon and
evening.
For the rest of southern Nevada, northwest Arizona and southeast
California...For the 18Z Forecast Package...Outside of thunderstorm
influences, expecting light winds that follow typical, daily
patterns. Scattered showers and storms are likely today, especially
across the Mojave Desert during the daytime hours. Storms will
likely contain erratic and gusty outflow winds, frequent lightning,
and brief MVFR/IFR conditions and terrain obscuration within heavy
rain. Thunderstorm potential should wane after sunset, but isolated
to scattered showers may linger into the night. Cloud bases
generally 8-12kft throughout the period, with periods of SCT-BKN
conditions.
&&
.SPOTTER INFORMATION STATEMENT...Spotters are encouraged to report
any significant weather or impacts according to standard operating
procedures.
&&
$$
DISCUSSION...Morgan
AVIATION...Morgan
For more forecast information...see us on our webpage:
https://weather.gov/lasvegas or follow us on Facebook and Twitter

NWS VEF Office Area Forecast Discussion