Area Forecast Discussion
Issued by NWS Las Vegas, NV
FXUS65 KVEF 232129
Area Forecast Discussion
National Weather Service Las Vegas NV
229 PM PDT Sun Apr 23 2017
.SYNOPSIS...Expect breezy to windy conditions through Tuesday
with periods of high clouds and above normal temperatures.
.SHORT TERM...through Tuesday Night.
A shortwave trough is moving across the area today bringing windy
conditions. Wind Advisory for Clark, Mohave, and northern San
Bernardino Counties remains in effect until 8 PM. Wind has been
consistently blowing at 25 to 30 mph with gusts to 45 mph common.
Windy conditions will continue over the next couple days as a
broad trough sinks southward encompassing the entirety of the
western CONUS. A tightening pressure gradient associated with this
trough will bring strong winds to the southern half of the
forecast area Monday into Monday night. A High Wind Warning has
been issued for this time period across western and south central
San Bernardino County with a Wind Advisory for eastern San
Bernardino and southern Clark and Mohave Counties. Wind should
decrease from east to west Monday night. Little in the way of
precipitation is expected beyond some very light showers in the
Sierra and perhaps northern Lincoln County. Wind will decrease
Tuesday as the trough moves off into the central part of the
country, leaving the west in northwest flow. Temperatures through
Tuesday will remain 5 to 10 degrees above normal.
.LONG TERM...Wednesday through Saturday.
Minor changes were made to the long term forecast this morning and
overall confidence is moderate at best. In general, northwest flow
is expected to dominate through the period. This will keep the vast
majority area dry with occasionally breezy conditions. There will be
chances for light precipitation across central Nevada and perhaps
far northern Mohave County during the latter part of the week. The
main change this morning vs 24 hours ago is the Wednesday/Thursday
wave discussed yesterday is far less pronounced. Instead a second
wave carves out a trough over the region late Thursday through
Friday. This has implications for the timing of wind and temperature
changes. I only made modest tweaks to the forecast due to the low
confidence in these details at this time.
.AVIATION...For McCarran...Southwest wind of 20 to 25 kt gusting
to 35 kt can be expected into the evening. Wind will decrease
after 02Z Monday but remain gusty to 25 kt. After 08Z, wind can
be expected to remain southwest at around 10 kt. Periods of
scattered high clouds can be expected through the period.
For the rest of southern Nevada, northwest Arizona and southeast
California....Gusty wind can be expected through the evening with
most areas seeing a reduction in wind overnight. Wind will be an
issue again on Monday afternoon into Monday night across portions
of the area with the KDAG KEED KIFP and KIGM most affected. Wind
gusting over 50 kt is expected at KDAG with wind closer to 30 kt
elsewhere. Periods of scattered high clouds can be expected
throughout the period.
.FIRE WEATHER...Dry and windy conditions will continue into
Tuesday across much of the area. RH values across eastern San
Bernardino and southern Mohave Counties, including the lower
Colorado River Valley will be in the 10-15% range. Near Red Flag
conditions are expected as the will be a period, mainly Monday
evening, where wind will be approaching criteria in these areas.
The windiest times should coincide with a period of increasing RH
during the late evening hours.
.SPOTTER INFORMATION STATEMENT...Spotters are encouraged to report
any significant weather or impacts according to standard operating
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