Area Forecast Discussion
Issued by NWS Las Vegas, NV

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FXUS65 KVEF 202135
AFDVEF

Area Forecast Discussion
National Weather Service Las Vegas NV
235 PM PDT Fri Apr 20 2018

.SYNOPSIS...A dry and warm weather pattern will hold over the
region through the weekend and much of next week.
&&

.SHORT TERM...through Sunday night.

Northwest winds gusting 25 to 35 mph early this afternoon will
generally decrease to less than 15 mph this evening on the back side
of the upper low moving away over the Four Corners region. Winds
will be quite light Saturday through Sunday morning as a ridge
migrates over the western states. Temperatures will climb about 5
degrees each day to reach the upper 80s to lower 90s across the
Mojave Desert zones by Sunday. A short wave trough is forecast to
brush northern Nevada Sunday afternoon and Sunday night which will
stir up winds over the southern Sierra and western Mojave Desert but
speeds will generally be 10 to 20 mph for the valleys and deserts
and around 20-30 mph in the higher terrain.
&&

.LONG TERM...Monday through Friday.

A stretch of well above normal temperatures will continue from the
weekend into next week as ridging sits overhead. Diurnal temperature
ranges will be 8-12 degrees above normal through the long term, with
Las Vegas in the low 90s for highs which is more typical of late
May. A quick moving shortwave  to the north will aid breezy south
winds Monday and Tuesday, which should help boost temps even more
each of those days. While ridging looks to remain overhead through
Thursday, there is better agreement between models this morning on
an upstream cutoff low developing a couple hundred miles off the CA
coast on Wednesday. Prior runs have shown this feature as well, but
the latest runs are trending a slightly more progressive solution.
Cutoff now shows slow eastward advancement into NorCal on Thursday,
which would put the Great Basin and Mojave desert in a great
position for breezy to strong southerly winds; confidence is low on
current forecast wind speeds Thursday, which are fairly conservative
when compared to either extended MOS guidance. If models continue to
agree on this setup, I suspect winds will need to be increased for
Thursday.
&&

.AVIATION...For McCarran...Northwest winds will continue to gust
20-25 knots through the afternoon then decreasing and swinging back
to the typical southwesterly direction overnight. Aside from FEW-SCT
clouds around 10k feet this afternoon, operationally significant
clouds and weather are not expected. Quieter weather is expected
over the weekend.

For the rest of southern Nevada, northwest Arizona and southeast
California...FEW-SCT clouds 8-10k feet over Lincoln, Clark, Mohave
counties this afternoon with clear skies elsewhere. Northwest winds
across the region gusting 20-30 knots through the afternoon then
decreasing tonight and trending to typical diurnal directions. Dry
and quiet weather over the weekend.
&&

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

$$

SHORT TERM...Adair
LONG TERM...Boothe
AVIATION...Salmen

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