Area Forecast Discussion
Issued by NWS Las Vegas, NV

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FXUS65 KVEF 242127

Area Forecast Discussion
National Weather Service Las Vegas NV
227 PM PDT Mon Apr 24 2017

.SYNOPSIS...An active storm track in the western US will bring
periodic gusty winds and batches of clouds to the region through
the week.

.SHORT TERM...through Wednesday.

A trough diving southeast across the intermountain west will drag
a cold front across the entire area overnight tonight with breezy
north winds and cooler temperatures taking over for Tuesday.
Cannot rule out a few showers across the northeast fringes of the
area /Lincoln and Mohave counties/ as the trough passes by

By Wednesday the aforementioned trough will eject over the
southern plains while more energy begins to reload off the British
Columbia coast. Calmer winds and recovering temperatures expected
for Wednesday.

.LONG TERM...Thursday through Sunday.

Northwest flow will dominate through Thursday as a developing trough
begins to form early Friday near the four corners. Confidence has
increased on the development of this system as the ECMWF, GFS and
GFS ensemble have general good agreement on timing and further
deepening of this trough. As this system develops and deepens, winds
will likely be from the north-northwest and be gusty beginning as
early as Thursday night through most of Saturday. Overall, northerly
flow will continue through Sunday, but is expected to weaken
considerably by Sunday morning as the system moves further east.
There is the possibility of precipitation for portions of northern
Lincoln Co. and northeast Mohave Co. as the low pressure system
develops Friday afternoon through Saturday afternoon. Otherwise, no
other mentionable chances for precipitation after Saturday.
Temperatures are expected to drop by at least 8-10 degrees on
Friday, which is 7-12 degrees below normal. Temperatures will slowly
rebound back up to about normal by Sunday.

.FIRE WEATHER...Gusty west winds on Monday will transition to
breezy north winds with gusts around 30 mph on Tuesday with
afternoon humidities 10 to 20 percent. Dry air remains in place
with similar or lower humidity on Wednesday, though generally
calmer winds for most of the day before picking back up Wednesday
evening and Thursday. Winds gusting over 35 MPH and humidity
falling to at or below 10 percent look to increase fire danger for
the end the week.

.AVIATION...For McCarran...West southwest winds will remain
elevated, gusting around 25 knots, through tonight when a shift to
the northwest is expected between 04-06z with frontal passage.
Periods of SCT-BKN mid and high cloud coverage can be expected
through early Tuesday. Northwest winds will lose gustiness late
tonight remaining around 10-15 knots overnight. Northwest winds will
be on the rise early tomorrow morning reaching sustained 15-20 knots
gusting around 25 knots by mid morning which is expected to persist
through the afternoon. Winds decrease Tuesday evening becoming more
northerly around 10 knots or less.

For the rest of southern Nevada...northwest Arizona...and southeast
California...Gusty winds continue overnight in most areas with winds
shifting form the west to northwest as a cold front passes
overnight. San Bernardino County could see gusts of around 50 knots
with visibilities reduced due to blowing dust/sand through tonight
when winds begin to slowly decrease into tomorrow. Other areas along
the I-40 corridor in NW Arizona and southern NV could see gusts of
30-35 knots through tonight. Northerly winds become breezy on
Tuesday, especially north of I-15 where gusts of 30-35 knots will be
possible. Most areas remain dry with isolated shower activity
possible across northeast Lincoln county on Tuesday.

.SPOTTER INFORMATION STATEMENT...Gusty winds are occuring across
the western Mojave desert. Spotter are encouraged to report any
damage or reduced visibilities through tonight. Another round of
widespread gusty wind is possible by the end of the week.


Short Term/Fire...Steele
Long Term...Kryston

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