Amargosa Valley, Nevada Weather Forecast Discussion

991
FXUS65 KVEF 201121
AFDVEF
Area Forecast Discussion
National Weather Service Las Vegas NV
421 AM PDT Sat Sep 20 2025
.KEY MESSAGES...
* Slight chances for showers and thunderstorms will linger through
  the weekend and into the upcoming week.
* Humid conditions will continue, and additional tropical moisture
  could get pulled northward around the middle of the week.
&&
.DISCUSSION...through Friday. Early morning satellite loop showed
much quieter conditions than 24 hours ago with only scattered mid
level clouds. Surface obs showed humid conditions, light winds, and
mild temperatures. The humid conditions left over from Mario`s
passage will be one driver of thunderstorm chances, which will be
the primary forecast concern. Another driver will be the cutoff low
near 32N 129W early this morning. Unfortunately, as is often the
case with cutoff lows, there is still a lot of model disagreement
regarding its eventual eastward track - when will it kick inland,
and how far north or south will it be when it does so? These factors
will drive when and where the best thunderstorm chances will occur,
so low confidence in these details means a low confidence
thunderstorm forecast. What can be said with moderate to high
confidence is that another slug of tropical moisture southwest of
the Baja will track northward over the weekend, and IF the cutoff
low does not move north, this moisture will get directed onshore on
the southeast side of the low. This could lead to enhanced rain
chances southeast of I-15 as early as Sunday and Sunday night.
Around midweek, IF the low begins to move inland as most of the
clusters suggest, there could be another round of enhanced
thunderstorm chances, but exactly where this occurs would be highly
dependent on how far north or south the low is when it moves inland.
Clusters suggest anywhere from San Francisco to Ensenada, so
confidence is low. Slightly less than half of the clusters show a
Gulf of Alaska low bringing southwest flow to our area next weekend,
possibly flushing out the lingering moisture, but this is a long way
away.
&&
.AVIATION...For Harry Reid...For the 12Z Forecast Package...Winds
will be light and diurnal today, with speeds generally 8 kts or
less. Cannot rule out an occasional gust to 15 kts from the
southeast this afternoon. SCT aoa 12 kft expected over area
mountains this afternoon, but will clear out after sunset.
For the rest of southern Nevada, northwestern Arizona and
southeastern California...For the 12Z Forecast Package...Winds will
be light today following typical diurnal directional trends, with
speeds generally 8 kts or less. The exceptions will be KBIH, with
gusty south-southeast winds to 20 kts this afternoon and KDAG, with
breezy westerly winds after sunset between 8 and 12 kts. SCT aoa 12
kft on area mountains this afternoon, but will clear out after
sunset.
&&
.SPOTTER INFORMATION STATEMENT...Spotters are encouraged to report
any significant weather or impacts according to standard operating
procedures.
&&
$$
DISCUSSION...Morgan
AVIATION...Soulat
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NWS VEF Office Area Forecast Discussion