fxus65 kvef 291619
Area forecast discussion
National Weather Service Las Vegas Nevada
919 am PDT Mon may 29 2017
Synopsis...hot and dry conditions will persist through today
before an upper low influences the middle of the week. Slightly
cooler air, with partly cloudy skies and breezy afternoons Tuesday
and Wednesday. Then partly cloudy to mostly clear skies and a
warming trend to end the work week. &&
Update...made some tweaks to today's highs and nudged them a
little upward in a few locations to better align with guidance.
Otherwise, forecast in good shape, with generally light winds for
most; maybe a few breezes around the Colorado River valley by
Previous discussion... /issued at 247 am PDT Mon may 29 2017/
Short term...today through Wednesday.
Continued high pressure over the area today will allow
temperatures to rise another 3-5 degrees from yesterday's. Sunny to
mostly clear skies with light winds are expected to last through
Memorial Day before a pattern change on Tuesday. As the high
pressure ridge moves east, a developing upper trough off the Pacific
northwest is expected to dig further south, increasing cloud cover, and
slight chances for precipitation along the Sierra. Models have been
in relatively good agreement on placing mountain enhanced shower and
thunderstorms Tue and Wed afternoon over the sierra's. Though,
likely chances for rain along the eastern Sierra will be Wed
afternoon. Otherwise, troughing is expected to be relatively dry at
this time, but breezy southwest conditions with gusts around 20-25
mph exist for Tuesday and up to 30 mph Wednesday afternoon. Cool air
advection associated with the troughing influence on Tue will allow
for temperatures to decrease 5-8 degrees by Wed afternoon. Partly
cloudy to mostly cloudy skies will accompany the low pressure system
as it moves through the region Wednesday.
Long term...Thursday through Sunday.
The overall pattern through the period should consist of a weak trough
Thursday, followed by ridging Friday and Saturday, then perhaps
another trough approaching Sunday. There is still considerable
model spread on the details, but very few ensemble perturbations
would suggest any impactful weather. Temperatures should be a few
degrees above normal through the period with breezy afternoons and
dry conditions, with the exception of a small chance of
thunderstorms near the Sierra crest Sunday afternoon. All in all,
it looks like the beginning of June will be pretty quiet.
Aviation...for McCarran....light diurnal winds will continue through
the early morning before a wind shift around 15z this morning.
Winds are expected to begin favoring a NE direction before turning
more easterly in the afternoon. Wind speeds should generally be
below 10 kts before decreasing and becoming light and variable by
00z today. Then diurnal winds will again dominate through the
night and into tomorrow.
For the rest of southern Nevada, northwest Arizona and southeast
California...winds should follow the typical diurnal pattern
through today. Southwest winds should arrive at kdag around 03z
Spotter information statement...spotters are encouraged to report
any significant weather or impacts according to Standard operating