686 
FXUS65 KVEF 112208
AFDVEF

Area Forecast Discussion
National Weather Service Las Vegas NV
308 PM PDT Mon Mar 11 2019

.SYNOPSIS...A couple of low pressure systems will affect the region 
through Wednesday bringing chances for rain showers and mountain 
snow showers along with gusty winds at times. Temperatures will 
remain below normal through the middle of the week then an area of 
high pressure builds and allows temperatures to climb back to normal 
by the weekend.
&&

.DISCUSSION...

Tonight through Wednesday...We will see scattered to numerous 
showers developing this evening and overnight across southern Nevada 
and points to the south as a large closed low southwest of San Diego 
lifts toward Yuma by Tuesday morning. This more northeast track will 
bring the northern edge of the system over southern Nevada. Chances 
for measurable rain are now looking more likely from Las Vegas 
southward though amounts should generally be light...less than a 
tenth of an inch. However, some shower bands may produce locally 
higher amounts up to around a quarter-inch, especially over central 
and southern Mohave county. The Spring Mountains should see 1 to 3 
inches of snow above 7000 feet overnight. Shower chances will 
diminish Tuesday morning through the afternoon as the closed low is 
kicked eastward by a fast moving trough dropping down from northwest 
Nevada. This will sweep a cold front across the entire forecast area 
Tuesday evening through early Wednesday morning with widespread post-
frontal north-northwest gusts 40 to 50 mph likely impacting most 
zones. The strong northerly flow on the back side of the exiting 
trough will remain through Wednesday afternoon before gradually 
diminishing Wednesday night. 

Thursday through Monday will bring fairly tranquil weather to our 
region as a mean ridge builds over the western states. The latest 
GFS and ECMWF are showing a weak trough moving underneath the ridge 
over southern California/Arizona Friday through early Saturday but 
little sensible weather is indicated other than holding temps down 
slightly. A noticeable warmup begins Saturday and continues through 
early next week with highs climbing into the 70s across the Mojave 
Desert region.
&&

.AVIATION...For McCarran...North to northeast winds between 8-12 
knots with periodic gusts up to 20 knots will continue into the 
early evening with lighter, variable winds overnight. Increasing 
cloud cover and lowering CIGs are expected this afternoon and 
evening as isolated to scattered showers approach from the south; 
best window for showers at the airfield will be 04z-10z. Showers at 
or near the airfield will lower CIGs at or below 5kft. Dry 
conditions expected after sunrise Tuesday along with increasing 
southwesterly winds in the afternoon. A cold front will usher in 
gusty northwest winds Tuesday night; gusts up to 35 knots possible.

For the rest of southern Nevada, northwest Arizona and southeast 
California...Northwest to northeast winds between 8-15 knots and 
periodic gusts will continue at most sites through the early 
evening. A low pressure system will bring isolated to scattered 
showers to airfields along and south of I-15 through Tuesday 
morning. Wind speeds expected to be light with showers; CIGs 
expected to drop to 4-8 kft with overnight showers. CIGs will lift 
Tuesday morning/afternoon Tuesday as low pressure tracks east. South 
to southwest winds will increase Tuesday ahead of strong cold front 
pushing through Tuesday night.
&&

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

$$

DISCUSSION...Adair
AVIATION...Boothe

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