Area Forecast Discussion
Issued by NWS Las Vegas, NV
FXUS65 KVEF 231057
Area Forecast Discussion
National Weather Service Las Vegas NV
357 AM 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.
Strong winds will develop today beginning in the Spring Mountains
this morning and then across the deserts of San Bernardino, Clark
and Mohave counties this afternoon. This comes courtesy of a Pacific
trough bringing an increasing southwest flow and embedded upper
level disturbance to the region. Although wind/gust speeds are
marginal, a Wind Advisory was issued for portions of the area today
to highlight the winds. A well mixed boundary layer will bring an
increase in temperatures to the region as well with high temps 8-10
degrees above normal today.
We expect to see even stronger winds develop across San Bernardino
County Monday afternoon. Models/MOS guidance has been consistent in
bringing high-end Wind Advisory or low-end High Wind Warning level
winds to the county...especially the western half...Monday afternoon
and Monday night. A High Wind Watch was issued to highlight this
potential hazardous event. Elsewhere on Monday, breezy conditions
are expected. Temperatures are expected to tumble back to just a few
degrees above normal Monday afternoon.
Otherwise, a few light showers may develop in the Sierra and across
the southern Great Basin mountains as these disturbances clip the
region today through Tuesday. Expect breezy north winds and near
normal temperatures on Tuesday.
.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... Light winds this morning will become
gusty out of the southwest by midday and continue into the early
evening. A front is expected to bring gusty north winds to the
valley Monday evening through Tuesday. Clear-air mechanical
turbulence is possible today.
For the rest of southern Nevada, northwest Arizona and southeast
California... Gusty winds return to the forecast for most terminals
across the area today. Gusty west to southwest winds are expected
from KDAG through KHND, with gusty north winds by the evening at
KBIH and gusty southerly winds for KIFP and KEED. Clear-air
mechanical turbulence is possible.
.FIRE WEATHER...Gusty winds are expected to develop this
afternoon and Monday afternoon across the Mojave Desert with
afternoon humidities dipping into the 10 to 15 percent range in the
western Mojave Desert. Near Red Flag conditions are possible in the
Colorado River Valley and across portions of Mohave County today.
.SPOTTER INFORMATION STATEMENT...Gusty winds are expected in the
western Mojave Desert today through Monday evening. Spotters are
encouraged to report any significant weather or impacts according to
standard operating procedures.
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