Area Forecast Discussion
Issued by NWS Las Vegas, NV

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FXUS65 KVEF 222025

Area Forecast Discussion
National Weather Service Las Vegas NV
125 PM PDT Sun Oct 22 2017

.SYNOPSIS...High pressure will build over the region and remain in
place through much of the week.  Temperatures will climb well above
normal by Monday and Tuesday and remain warm and dry through the end
of next week. Gusty north winds are expected Monday and Tuesday down
the Colorado River Valley with generally light winds elsewhere.

.Discussion...through Sunday.

High pressure building over the region will lead to dry and warm
conditions through much of the upcoming week. A weak surface trough
will move through northern Nevada Monday and Tuesday bringing an
increase in the northerly flow to mainly the eastern half of the
forecast area. This will allow for an increase in north to northeast
winds and lead to better mixing. Gradients will be tightest down the
Colorado River where gusty north winds will occur. Once again winds
will be borderline for Wind Advisories and Red Flag Warnings, but
will hold off on any products and let the next shift take a closer

With high pressure building overhead, temperatures will rise to well
above normal Monday and Tuesday with readings approaching record
levels in some areas. By Wednesday, a weak system will dig south
over the northern Rockies and help push the ridge westward. This
will increase the surface gradient over the eastern half of the area
and potentially bring some gusty north to northeast winds to the
area Thursday and Friday while also bring in somewhat cooler air.
Outside of a few high clouds, skies will generally remain clear
through the week.

Once that weak system passes through the region the models once
again reestablish the high over the area next weekend bringing
increasing temperatures and continued dry conditions.

.AVIATION...For McCarran...Light easterly, and at times variable,
winds will continue through the afternoon remaining below 8 knots.
Drainage winds will begin to push through around 03z and remain
overnight. North to northeast winds will develop Monday morning with
speeds from 9-12 knots and some gusts up to 18 knots are possible in
the afternoon. Dry weather continues with mostly clear skies.

For the rest of southern Nevada, northwest Arizona and southeast
California...North winds will continue down the Colorado through
afternoon and begin to taper off this evening. Elsewhere, light
winds favoring diurnal patterns are expected through the evening and
overnight. North to northeast winds generally between 5-15 knots
will develop Monday, with the exception will EED and IFP where
strong north winds with gusts up to 30 knots are likely. No
operationally significant cloud cover expected.

.FIRE WEATHER...High pressure building over the area will
bring dry and warm conditions through much of the week. Gusty north
winds will return Monday and Tuesday especially down the Colorado
River where fuels remain critical. Humidity values will drop into
the single digits and lower teens with poor overnight humidity
recoveries. Localized Red Flag Conditions in the Colorado River
Valley will be possibly at times Monday and Tuesday.

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


Discussion/Fire Weather...Gorelow

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