Area Forecast Discussion
Issued by NWS Las Vegas, NV

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FXUS65 KVEF 260340

Area Forecast Discussion
National Weather Service Las Vegas NV
840 PM PDT Thu May 25 2017

.SYNOPSIS....A weak shortwave trough will clip our area bringing
temperatures down to season normals tomorrow and Saturday before
warming back up to triple digits on Memorial Day. Winds are
expected to be breezy to windy tonight and Friday for across the
Mojave Desert. Slight chances for showers in northeast Lincoln
County Friday and Saturday afternoon.


.UPDATE...A few lingering light showers exist across northern
Lincoln county but otherwise dry and breezy conditions dominate the
forecast area. Winds will tend to subside across the region this
evening but locally gusty conditions will persist in wind prone
locations and across the western Mojave desert. Current forecast is
in good shape and no updates are planned this evening.



.SHORT TERM...tonight through Sunday night

A shortwave trough is digging southward, currently positioned over
the OR/ID border. Under the troughs influence temperatures have been
slightly cooler this afternoon and will continue to hover around
the seasonal average tomorrow as well before a warm up this
weekend. Winds this evening will be breezy to windy across
southern areas of the Mojave Desert. A Wind Advisory for western
San Bernardino County is in effect until midnight tonight, with
winds gusting up to 45 mph spreading across much of that area.
Elsewhere, breezy to windy conditions are expected this evening
and will pick up again Friday. Tonight and tomorrow isolated
areas in Mohave County may reach wind gusts up to 40 mph, but have
not issued a Wind Advisory for those areas due to the isolated
nature. As the shortwave swings eastward Friday and Saturday it
will clip northeast Lincoln County where a slight chance of
afternoon showers and high based thunderstorms will be a

After the influence of the trough has passed, strong ridging will
build in behind it on Sunday and Monday. Temperatures will warm up
quiet a bit underneath the ridge and will push temperatures back to
triple digits across lower portions of the Mojave Desert. Winds will
be light through the Memorial Day weekend.


.LONG TERM....Monday through Thursday.

A ridge of high pressure will be centered over the area on Monday
and provide mostly dry conditions and temperatures several
degrees above their seasonal normals. An area of low pressure will
form off the southern California coast Monday night into Tuesday.
The exact track and strength of the low is still, but southeast
to easterly flow around the low will act to bring an increase in
moisture into the Mohave County on Tuesday. The operational GFS is
quickest to eject the low and moisture to the east, on Wednesday,
but is more of an outlier with the bulk of the guidance lingering
the moisture into at least Wednesday. I maintained a slight
chance of thunderstorms, particularly over the northwest plateau
of Mohave County Tuesday through Thursday. Temperatures will
remain above normal through the period with a couple of degrees of
cooling expected by mid week.


.FIRE WEATHER...conditions will remain hot and dry. With
gusty winds forecast to be around 35 MPH again this evening
across Clark and Mohave counties, critical fire weather conditions
are once again enhanced and a Red Flag Warning remains in effect to
highlight the potential for rapid fire spread.


.AVIATION...For McCarran...winds are expected to stay out of the
southwest to west direction through the evening gusting up to 25-30
kts until around midnight. Overnight a 10-18 kt wind will remain
southwesterly with occasional gusts up to 25 kts. Tomorrow morning
winds will lighten up around 14z-15z favoring a southerly direction,
similar to this morning. Clear skies expected through the period.

For the rest of southern Nevada, northwest Arizona and southeast
California...across the area wind directions will be west to
southwest with wind speeds around 15-20 kts and gusts up to 30
kts throughout the evening. The exception being KDAG where winds
will be westerly from 20-25 kts and gusting around 30-35 kts.
Winds will become lighter overnight for most areas except Mohave
County where an overnight southerly wind will be 15-20 kts. Slight
chances for showers are possible in northeast Lincoln County.
Elsewhere clear skies expected through the period.


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


LONG TERM.............Czyzyk

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