Area Forecast Discussion
Issued by NWS Las Vegas, NV

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FXUS65 KVEF 231633

Area Forecast Discussion
National Weather Service Las Vegas NV
Issued by National Weather Service FLAGSTAFF AZ
833 AM PST Tue Jan 23 2018

.SYNOPSIS...Other than lingering northerly breezes along the
Colorado River Valley today, expect mostly sunny skies, seasonal
temperatures and dry weather conditions through Wednesday. A fast
moving system will bring increasing winds and cooler temperatures to
the area later in the week with some shower activity expected over
the Sierra and southern Great Basin Thursday and Thursday night.

.UPDATE...Fairly quiet weather today as a ridge of high pressure
builds over the area. Generally light winds across the area with
breezy conditions down the Colorado River Valley were observed
this morning. These winds will continue today 15 to 20 knots
gusting 25 knots with isolated gusts up to 30 knots possible
around the Bullhead City/Laughlin area. High temperatures today
will be close to seasonal averages. No significant changes needed
to the current near term forecast.


.SHORT TERM...High pressure will be in play the next couple of days
as ridging along the western coastline today shifts east across
the intermountain region by Wednesday. A quick hitting storm
system then changes up the weather later Wednesday and Thursday.

Most areas will see relatively light winds, clear skies and seasonal
temperatures today and Wednesday. Gusty north winds 15-25 mph will
affect the Colorado River Valley again today with local wind gusts
between 35 and 40 mph. Decreasing winds tonight with lighter winds
expected on Wednesday.

A quick hitting system will bring increasing winds to the Sierra and
northwest CWA Wednesday night. High resolution models show some
potential for a weak downslope event reaching into the lower slopes
of the Sierra. At the moment, it doesn`t look like it justifies a
High Wind Watch. Thursday afternoon, models forecast 40-45 knot 700
mb winds across the deserts affecting San Bernardino, Clark and
Mohave counties. So, there is potential for advisory level winds
Thursday afternoon.

Precipitation amounts are not a big concern with this system due to
it`s quick hitting nature and limited moisture. The Sierra will
likely see showers develop overnight Wednesday spilling over into
the far reaches of the northern CWA on Thursday and the northeast
CWA Thursday night...possibly including northern Mohave County. One
other relatively minor impact will be cooler conditions heading into
the long term.


.LONG TERM...No significant weather impacts are expected Friday
through Monday. There is some indication of strong winds
developing late Tuesday with a cold low pressure system possibly
diving into the Great Basin, but confidence is low at this time.

The back side of the aforementioned system will be clearing our area
Friday morning followed by a ridge developing over the region through
the weekend then slight flattening of the ridge Monday. This will
lead to a warming trend with generally benign weather through
Monday. Highs across the Mojave Desert zones will generally climb
into the mid 60s and lower 70s by Sunday. Typical breezy to windy
conditions under the area of high pressure can be expected along the
Colorado River Valley from Laughlin-Bullhead City to Lake Havasu.

The ECMWF depicts a fast moving cold trough diving down over Nevada
Tuesday while the operational GFS keeps it much farther north and
progressing from west to east across the Intermountain Region. This
will be the main feature to watch in the extended period.


.AVIATION...For McCarran...Variable winds generally less than 7
knots can be expected through Wednesday morning under occasional
high clouds. Winds will likely favor a northeasterly direction late
this morning and afternoon with a shift to a southwesterly direction
this evening through early Wednesday.

For the rest of southern Nevada, northwest Arizona and southeast
California...Most of the region will see variable winds less than 10
knots through Wednesday morning under occasional high clouds. The
exception is along the Colorado River Valley from Laughlin-Bullhead
City southward where northerly gusts of 20-30 knots can be expected
through this afternoon. Winds are expected to weaken tonight.


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



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