Area Forecast Discussion
Issued by NWS Las Vegas, NV

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FXUS65 KVEF 242115

Area Forecast Discussion
National Weather Service Las Vegas NV
215 PM PDT Sun Sep 24 2017

.SYNOPSIS...Cool and dry conditions will give way to a gradual
warming trend this week. Occasional periods of enhanced north winds
are possible, most notably down the Colorado River Valley.

.SHORT TERM...Through Tuesday Night.

The upper level low that brought cool and breezy conditions the
last couple days continues to move northeast across Utah this
afternoon. In its wake, northerly winds of 15-20 MPH with gusts
20-30 MPH have been noted down the Colorado River Valley (with one
outlier gust to 45 MPH at the Lake Havasu Airport), with lesser
winds elsewhere. Those northerly winds look to increase slightly
on Monday down the river and a Lake Wind Advisory has been issued
(mainly for Lake Mohave and Lake Havasu). A warming trend is still
expected early this week with temperatures Monday rising 3-5
degrees each day.

.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....Northeasterly flow is expected to remain
around 10 knots with brief gusts of 15-20 knots possible for the
afternoon. Winds lessen around sunset becoming variable as they veer
around to the northwest overnight. Northeasterly flow is expected
once again on Monday around 10 knots for much of they day.

For the rest of southern Nevada, northwest Arizona and southeast
California...North to northeasterly flow continues today with breezy
conditions across the Colorado River Valley. Decreasing flow is
expected overnight before northerly winds pick up once again Monday
morning across most of the area. Highest winds will continue to be
along the Colorado River valley with gusts in the 25-30 knot range
possible today and tomorrow.

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


SHORT TERM...Wolcott
LONG TERM....Adair

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