Area Forecast Discussion
Issued by NWS Las Vegas, NV

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FXUS65 KVEF 250330

Area Forecast Discussion
National Weather Service Las Vegas NV
830 PM PDT Wed May 24 2017

.SYNOPSIS...A weak disturbance will produce isolated thunderstorms
into this evening across the southern Sierra and southern Great
Basin. This will also bring some cooling behind it Thursday and
Friday with breezy conditions lingering in some areas. Dry weather
and a warming trend are expected over the Memorial Day Weekend.

.UPDATE...The grids were updated earlier this evening to boost
precipitation chances slightly across Inyo and Nye counties where
some high based convection developed during the afternoon. Some
lingering shower activity persists this evening across central Nye
and Lincoln counties but lightning activity has diminished in the
last hour. Main impacts have been enhanced winds and isolated dry
microbursts with localized wind gusts of 50-60 mph observed in parts
of the Nevada Test site. Things will be settling down over the next
few hours and no additional updates are planned.



.SHORT TERM...through Friday.

A trough moving across the Pacific Northwest and northern Nevada was
bringing breezy to windy conditions to much of the area this
afternoon along with isolated thunderstorms across portions of
Esmeralda, Nye and Lincoln Counties. The gusty winds and isolated
thunderstorms will persist into the evening before diminishing
overnight. Weak troughiness and an area of mid level moisture and
weak instability will linger Thursday leading to isolated
thunderstorms over northern Lincoln County. Otherwise breezy and dry
conditions with slightly cooler temperatures can be expected
Thursday. Similar conditions are expected Friday with isolated
storms possible over Lincoln County. Winds do look a little weaker
with temperatures cooler a little more.

.LONG TERM....Saturday through Tuesday.

The weather pattern for the Memorial Day weekend is expected to be
dominated by high pressure before troughing before troughing becomes
more of a player across the southwestern states on Tuesday. A
transition from shortwave troughing on Friday to high pressure on
Sunday will warm temperatures from near seasonal averages Saturday
to several degrees above normal through the rest of the period. Look
for breezy afternoon winds at times with periods of high clouds
passing overhead and afternoon cumulus buildups and possible showers
over the Sierra.

.AVIATION...For McCarran....Breezy to gusty southwest winds should
continue through this afternoon peaking between 23-02Z. Sustained
winds 15-24 kts with gusts around 30 kts at times. After around 02-
03Z tonight, winds will be on a steady decline until becoming light
and variable by 13-14Z tomorrow morning. Southwest winds will again
begin to pick up similar to today around 20-21Z tomorrow. Sustained
winds tomorrow afternoon should be 14-22 kts with gusts up to 28 kts
at times. Periods of SCT150 to BKN150 through the evening tonight
before becoming mostly clear by tomorrow morning.

For the rest of southern Nevada, northwest Arizona and southeast
California...Breezy to gusty southwest winds will persist through
the afternoon today and through most of the evening across the
region. Expected sustained winds of 15-25 kts with possible gusts up
to 35 kts for our westerly wind prone sites. Periods of SCT clouds
are likely across most of the region today through the evening
before mostly clear skies tomorrow.  &&

.SPOTTER INFORMATION STATEMENT...A few thunderstorms will be
possible over the southern Sierra and central Nevada zones this
afternoon and evening. Spotter activation is not anticipated, but
spotters are encouraged to provide reports according to standard
operating procedures.

.FIRE WEATHER...Several sites across far southern Nevada and
northwest Arizona were seeing wind gusts around 35 mph while
humidity values dropped into the single digits. Models indicate more
areas seeing increased winds late this afternoon. A Red Flag Warning
was issued for northwest Arizona and mainly Clark County in Nevada
valid until 9 pm. There will be areas of near critical fire weather
conditions Thursday but it does not look widespread enough or long
enough duration for a Red Flag Warning at this time.&&

Short Term...Harrison
Long Term...Salmen

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