Area Forecast Discussion
Issued by NWS Las Vegas, NV

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FXUS65 KVEF 231611 AAA
AFDVEF

Area Forecast Discussion
National Weather Service Las Vegas NV
910 AM PDT Mon Oct 23 2017

.SYNOPSIS...Warm and dry weather is expected this week with the
warmest temperatures expected for the first half of the week ahead.
In addition, periods of gusty north winds are expected down the
Colorado River Valley.
&&

.Update...High pressure over the region will lead to well above
normal temperatures areawide today. A weak surface trough will help
increase the surface pressure gradient down the Colorado River
Valley today bringing an increase in northerly winds. Winds are
expected to be strong enough for Lake Wind Advisories and the
current one we have in place looks good. No updates needed.
&&

PREV DISCUSSION
200 AM PDT Mon Oct 23 2017

.Short Term...through Thursday Night.

Impressive ridge building over the Western States will result in
very warm temperatures through midweek, with temperatures warming to
within a few degrees of record territory by late the afternoon. In
response to the building high, pressure gradients will tighten
resulting in gusty north winds down the Colorado River Valley. Some
gusty winds are anticipated by later this morning, with even
stronger winds expected Tuesday. Opted to issue a Lake Wind Advisory
for the Monday-Tuesday period, though winds may bump more into
general wind advisory criteria at times near Laughlin on Tuesday. By
Wednesday and Thursday, high pressure will build further north and
west, resulting in gradual cooling for our area and decreasing wind
speeds.

.Long Term...Friday through Sunday.

A high-amplitude trough is forecast to remain over the western CONUS
through the long term period. Winds down the Colorado River Valley
in the wake of a weak passing wave on Thursday will be the only real
sensible weather. The high will keep temperatures some 5-10 degrees
above normal through the weekend.
&&

.AVIATION...For McCarran...Light and variable winds this morning
will give way to breezy northeast winds this afternoon which will
persist into Tuesday. Speeds this afternoon will tend to be in the 9-
12 knot range with gusts to 20 knots possible, with similar
conditions Tuesday. Mostly clear skies expected.

For the rest of southern Nevada, northwest Arizona and southeast
California...Increasing north or northeast winds expected across the
region today under mostly clear skies. Strongest winds will be near
KIFP and KEED where gusts of 25 to 35 knots are possible. Elsewhere,
max gusts to 20 knots are expected.
&&

.FIRE WEATHER...Red Flag Warning issued for the Colorado River
Valley area Monday - Tuesday. High pressure building over the area
will bring dry, windy and warm conditions through much of the week.
Gusty north winds Monday and especially on Tuesday down the Colorado
River where fuels remain critical. Humidity values will drop into
the single digits and lower teens with poor overnight humidity
recoveries.
&&

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

$$

Update...Gorelow

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