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Area Forecast Discussion (AFD)

Issued by Las Vegas, NV (VEF)

                            
025 
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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