Weather Service Report


611 
FXUS65 KVEF 231747
AFDVEF

Area Forecast Discussion
National Weather Service Las Vegas NV
323 AM PST Sun Feb 23 2020

.SYNOPSIS...Lingering rain and higher elevation snow over the 
northern half of Mohave County will exit to the east by late this 
morning. Dry, breezy conditions and above normal temperatures will 
prevail today and tomorrow. Temperatures drop back down to seasonal 
normals on Tuesday but will quickly rebound during the second half 
of the work week.
&&

.UPDATE...We had some reports of patchy dense fog in Pahrump Valley 
this morning. Judging from the GOES 17 fog satellite imagery, there 
were some very isolated pockets of dense fog areawide. With the 
sunrise, these have burned off and clouds associated with the system 
from yesterday have pushed east. Sunny skies with above-average 
temperatures expected today. Breezy north-northwest winds will set 
up across the region, but will be of minimal impact. No changes were 
made to the current forecast, as it looks to be in good shape.
&&

.PREVIOUS DISCUSSION...323 AM PST Sun Feb 23 2020/


.SHORT TERM...Today and Tomorrow. 

A low pressure system, which is currently centered just west of 
the Four Corners, continues to facilitate the development of a 
band of light to moderate rain/higher elevation snow as moisture 
wraps around on the back side of this system. This band of 
precipitation, which is pushing south of I-15 in southern Nevada, 
will continue to progress southeastward into Mohave County early 
this morning. Expect anywhere from a trace up to a couple tenths
of an inch of liquid precip out of this band. Additional high 
elevation snowfall will set up over the Spring Mtns, Sheep Range, 
and higher elevations of the AZ Strip. Accumulations look to 
remain between 1 to 3 inches above 6500 feet. With the precip 
wrapping up across Lincoln County, have decided to cancel the 
Winter Weather Advisory a couple hours early. As the closed low 
exits to the east, it will pull the low ceilings and remaining 
rain/snow chances along with it. Any lingering activity in Mohave 
County should end by mid-morning. 

Dry weather and clear skies can be expected for the remainder of 
Sunday and into Monday. Breezy, north to northwest flow will be 
present today and tomorrow with speeds generally between 10 to 15 
mph gusting 20 to 25 mph. Above normal temps expected.

.LONG TERM...Tuesday through Saturday.

A secondary trough will dig across the central U.S. going into
Tuesday as a ridge over the eastern Pacific weakens due to a 
series of shortwave troughs moving into the Pacific Northwest. 
The ridge remains situated along the West Coast through Friday as 
the aforementioned shortwave troughs transition southeastward across 
the Great Basin along the western extent of a persistent trough over 
the eastern two-thirds of the CONUS. Ultimately, this will lead to 
fairly quiet weather for much of the week. High clouds will spill 
over the ridge periodically and northerly winds will prevail. 
Gradient remains tight on Tuesday with the initial digging trough 
still in the vicinity and gusts of 20-25 mph are expected. The 
Colorado River Valley will see enhancement of the northerly winds 
and therefore slightly higher wind speeds with gusts of up to 30 to 
35 mph possible near Lake Mohave and Lake Havasu. Winds remain 
breezy in this area Wednesday and Thursday with slightly lower wind 
speeds. Northerly flow will usher in a slightly cooler airmass 
bringing temps back down closer to near normal on Tuesday. Temps 
warm up for the remainder of the work week back to above normal 
values. Models are beginning to pick up on the next system moving in 
next weekend but model and run-to-run consistency is poor this far 
out. 
&&

.AVIATION...For McCarran...Rain chances should end by 12Z this 
morning, followed a few hours later by decreasing clouds, leading to 
VFR conditions from about 15Z onward. Expect light easterly winds 
during the day, switching back to light south southwest overnight. 
Northerly winds Monday could be just strong enough to cause runway 
configuration issues.

For the rest of southern Nevada, northwest Arizona and southeast 
California...Skies had already cleared in Esmeralda and northern 
Inyo counties as of 10Z, and the clearing line will progress 
southeast through Mohave County by 20Z today. Light rain early this 
morning will be limited to Clark and Mohave counties, with 
associated low ceilings and terrain obscuration. Expect VFR 
conditions areawide Monday, with northerly winds gusting 20 to 30 
knots in exposed and terrain favored areas such as the Colorado 
River Valley.
&&

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

$$

UPDATE...Varian
SHORT TERM/LONG TERM...Guillet
AVIATION...Morgan


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Western Regional Climate Center, wrcc@dri.edu