Area Forecast Discussion
Issued by NWS Las Vegas, NV

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FXUS65 KVEF 041042
AFDVEF

Area Forecast Discussion
National Weather Service Las Vegas NV
340 AM PDT Thu Jun 4 2020

.SYNOPSIS...Hot conditions today will break Friday as a low
pressure system swings up across Southern California and toward the
Four Corners region Friday night. A broad area of low pressure will
then move over the western states this weekend and early next week
with gusty winds and significant cooling.
&&

.SHORT TERM...Today through Saturday.

Temperatures will peak today with highs nudging up a degree or two
as a ridge amplifies over the region in response to the upper low
retrograding well off the SoCal Coast. Excessive Heat Warnings
remain in effect from 11 AM this morning until 8 PM this evening to
include much of southern Nevada along with the Colorado River Valley
and Death Valley. South breezes 15-25 mph will increase this
afternoon across much of the region.

South winds will increase even more Friday as the upper low swings
into Southern California by Friday afternoon then opens up and lifts
toward the Four Corners Region Friday night through Saturday
morning. South winds gusting over 35 mph will be fairly widespread
across southern Nevada and northwest Arizona Friday afternoon
leading to critical fire weather conditions and also adverse boating
conditions on Lake Mead and Lake Mohave. In addition, scattered
showers and isolated thunderstorms will be possible over Inyo
County, central Nevada and far northern Arizona Friday afternoon
through Friday night.

A deep broad trough centered near the Pacific Northwest will then
dig over the western states Saturday which will produce a belt of
gusty southwest winds and significant cooling. Temperatures will
drop 15-20 degrees from today`s readings. Chances for showers and
thunderstorms will remain around central Nevada Saturday.

.LONG TERM...Sunday through Thursday.

The broad trough will remain over the region Sunday and Monday
providing continued breezy to windy conditions and temperatures
around 10 degrees below normal. Ensemble models indicate the trough
will lift away to the east Tuesday and allow a ridge to build over
the region through the middle of the week with temperatures climbing
back into the triple digits over the Mojave Desert zones.
&&

.FIRE WEATHER...Strong south winds will develop Friday for Clark,
Lincoln, and Mohave Counties where gusts of 35 to 40 mph are likely
along with single digit relative humidity values. A Fire Weather
Watch remains in effect for these areas.
&&

.CLIMATE...Here are the record high temperatures
(most recent year of occurrence) for a few notable
locations.

 LOCATIONS:                June 4
 - Las Vegas               109(2016)
 - Kingman                 108(2016)
 - Needles                 118(2016)
 - Death Valley NP         122(1996)

&&

.AVIATION...For McCarran...Light and variable winds this morning
will give way to southerly winds late this morning or early
afternoon. Winds may initially come in as easterly or southeasterly,
but should transition to southerly for most of the afternoon. A few
afternoon cumulus buildups possible once again, with a shield of
high clouds also working up from the south. Bases should remain
above 12 Kft.

For the rest of southern Nevada, northwest Arizona and southeast
California...A few more afternoon cumulus buildups are possible once
again on the Sierra Nevada, with a push of southerly winds coming up
the Colorado River Valley. VFR conditions expected through the TAF
period, with a shield of higher clouds moving up from the south
through the day.
&&

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

$$

DISCUSSION...Adair
AVIATION...Steele

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https://weather.gov/lasvegas or follow us on Facebook and Twitter


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