Area Forecast Discussion
Issued by NWS Las Vegas, NV

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FXUS65 KVEF 240913

Area Forecast Discussion
National Weather Service Las Vegas NV
213 AM PDT Sun Sep 24 2017

.SYNOPSIS...Cool fall weather will continue today with gradually
warming temperatures through the upcoming week. Occasional north
breezes can be expected, especially down the Colorado River Valley.

.SHORT TERM...through Tuesday night. Aside from breezy north winds
down the Colorado River Valley, quiet weather is expected this
period. After one more unseasonably cool day today, temperatures
will rebound several degrees Monday and Tuesday as the deep trough
finally moves away.

.LONG TERM...Wednesday through Sunday.

Few if any weather impacts are in store for our forecast area from
Wednesday into next weekend. Even though a short wave diving down
from the north is forecast to spin up a weak closed low over
southern Nevada and surrounding states Wednesday, moisture will be
confined mainly over Arizona and Utah. There may be enough moisture
and instability over eastern and northern Mohave County Thursday for
a chance of showers and thunderstorms. Also, periods of northeast
winds 15-25 mph will be stirred up by the low over parts of southern
Nevada and the Colorado River Valley Wednesday and Thursday. The
upper low is then forecast to slowly move over the Four Corners
region Friday into Saturday, but the operational models begin to
diverge with upstream synoptic features. The GFS depicts a weak open
trough dropping down through southern Nevada by Saturday followed by
ridging Sunday while the ECMWF brings a broad ridge inland from the
West Coast next weekend. In any case benign weather is indicated and
temperatures will be near or slightly above normal with highs
climbing back into the upper 80s to lower 90s across most of the
Mojave Desert region.

.AVIATION...For McCarran...Light winds early this morning will
eventually favor a more northwesterly direction around sunrise
before turning more northeasterly later this morning. Speeds should
remain under 10 knots about 80 to 90 percent of the time. The
northeasterly winds will persist after sunset, but southwesterly
drainage winds should eventually take over before midnight. Skies
will remain mostly clear.

For the rest of southern Nevada, northwest Arizona and southeast
California...Skies will be mostly clear areawide today, with north
to northwest winds 10 to 15 knots in most areas. The exception will
be the Colorado River Valley, especially the Laughlin Bullhead City
area, where north winds could gust around 30 knots.

.SPOTTER INFORMATION STATEMENT...Spotters are encouraged to report
any significant weather or impacts using standard operating


Short term/Aviation...Morgan
Long term...Adair

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