Area Forecast Discussion
National Weather Service Las Vegas NV
248 PM PDT Sat Sep 13 2025
.KEY MESSAGES...
* High pressure building over the southwest will allow for dry, mild
weather and increasing temperatures through the middle of next
week.
* Moisture looks to return to the region late next week, bringing
increased cloud cover and precipitation chances with it.
&&
.DISCUSSION...through Friday.
Ridging will slowly build in over the region in the wake of the low
pressure system responsible for the cooler than normal temperatures
of the past few days. As 500 mb heights rise, temperatures will
begin to gradually increase as we head into next week with
temperatures returning to normal by the middle of the week. In
addition to warming temperatures, dry conditions and mild weather
are on tap for southern Nevada, northwestern Arizona, and
southeastern California through mid-week thanks to the upper-level
ridge.
While ridging builds over the area early next week, weak cut-off low
will begin to develop off the coast of southern California and the
remnant circulation that was formerly tropical storm Mario will
continue to drift northwest. By mid-to-late week, moisture from the
remnants of Mario will have made it far enough north for moisture to
be advected into the Southwestern US by the south-southwesterly
upper-level flow resulting from low pressure system off the coast of
California. This increase in moisture will result in increasing
cloud cover during the day on Wednesday and increasing
precipitation chances beginning Thursday. 500 mb heights will fall
as the low off the coast of California begins to inch closer to the
coast. This will result in cooler than normal temperatures returning
to the region as we head into the weekend.
&&
.AVIATION...For Harry Reid...For the 00Z Forecast Package...Winds
will follow typical daily directional trends through the Sunday
morning with sustained speeds of 8 knots or less. Winds will
become light and variable early tomorrow morning before picking up
and settling in from the southeast during the afternoon.
Tomorrow`s southeasterly winds will hover around 10 knots. VFR
conditions prevail with temperatures remaining below 100 degrees
into next week.
For the rest of southern Nevada, northwest Arizona and southeast
California...For the 00Z Forecast Package...Across the region,
winds will follow typical diurnal patterns through Sunday morning,
with sustained speeds under 10KT. The exception to this is the
western Mojave Desert where winds will become light and variable
this afternoon, shifting to the west and picking back up with
sustained speeds of 10 to 15 knots beginning this evening. These
breezy westerly winds will continue through Sunday morning. Dry,
VFR conditions prevail areawide.
&&
.SPOTTER INFORMATION STATEMENT...Spotters are encouraged to report
any significant weather or impacts according to standard operating
procedures.
&&
$$
DISCUSSION/AVIATION...Stessman
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