Area Forecast Discussion
Issued by NWS Las Vegas, NV
FXUS65 KVEF 251700
Area Forecast Discussion
National Weather Service Las Vegas NV
1000 AM PDT Tue Apr 25 2017
.SYNOPSIS...Post frontal breezy winds and cooler temperatures are
expected today. Periods of gusty winds return as a developing low
pressure system begins to form Wednesday through Friday. Patchy
cloud cover Wednesday, otherwise mostly clear skies and near normal
temperatures through the weekend.
Breezy, northwest winds this morning will slowly subside into this
evening as a shortwave trough exits to the southeast. Temperatures
are expected to be cooler than yesterday with max temps this
afternoon around 5 degrees below normal. A majority of the low and
mid level cloud cover has exited the area along with chances for
scattered precipitation across Lincoln County so have lowered these
parameters in the forecast for today accordingly.
.PREV DISCUSSION...335 AM PDT Tue Apr 25 2017
.SHORT TERM...Today through Wednesday.
As a cold front exits the region this morning, post-frontal
breezy north winds are expected to remain through the afternoon
today. Temperatures today are forecast to be 3-5 degrees below
normal. Calmer winds are expected to settle in this evening.
Mostly clear skies will allow temperatures to quickly rebound
tomorrow back to about normal for this time of year. Breezy to gusty
west-northwest conditions will yet again creep back into our western
and northern counties Wed afternoon through the evening as a strong
jet digs across our northwest CWA. If current model trends
continue, advisory level winds are likely to occur for the White
Mtns, Owens Valley, Eastern Sierras, central Nye County and
western San Bernardino County. Models have slight chances for a
few showers in northeast Lincoln Co as the developing trough moves
through on Wednesday afternoon.
.LONG TERM...Thursday through Monday.
A dry northwest flow will be over the area Thursday with
temperatures close to normal and locally breezy northwest surface
winds, especially in Esmeralda and central Nye Counties. An upper
level trough will deepen into a closed low Thursday night through
Friday night as it moves from from northern Utah to the
Colorado/New Mexico border. Moisture with this system will mainly
stay east of our forecast area but there will be a chance of
showers over eastern Lincoln County and northeast Mohave County.
The main impacts will be nearly a ten degree drop in high
temperatures for Friday along with strong north winds across a
good portion of the area. Overall the windiest time frame looks to
be Friday afternoon and evening. A dry northwest flow is expected
to be over the area Saturday through Monday with temperatures
warming a little each day. By Monday we are forecasting high
temperatures a few degrees above normal. Gusty northerly winds
Saturday will weaken a little Sunday with generally light winds in
most areas by Monday.
.FIRE WEATHER...Much of the area will see fairly low relative
humidity today along with gusty north winds. The Colorado River
Valley will see near critical fire weather conditions but it looks
like widespread wind gusts will mainly remain below the 35 mph
threshold. Another shot of strong north winds and low humidity is
expected Friday, possibly continuing into Saturday.
.AVIATION...For McCarran...Gusty northwest winds are expected to
remain throughout the morning and most of the afternoon with
sustained 12-20 kts and gusts up to 30 kts at times. Gusty
northwest winds should die off around 03Z Wednesday. Generally,
northwest to west winds will dominate the flow until becoming
light and variable around 12Z Wednesday.
For the rest of southern Nevada...northwest Arizona...and southeast
California...Overall, west-northwest winds will dominate the flow
over the next 24 hours. Breezy winds are expected to remain for most
of the region today through 02-03Z Wednesday. After, winds will
continue to decrease before diurnal trends settle in around 12Z.
Breezy to gusty winds will return Wednesday afternoon through the
evening for most of the region.
.SPOTTER INFORMATION STATEMENT...Spotters are encouraged to
report any significant weather or impacts according to standard
Long Term/Fire Weather....Harrison
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