Scientific Forecaster Discussion
fxus65 kvef 232158
Area forecast discussion
National Weather Service Las Vegas Nevada
issued by National Weather Service Flagstaff Arizona
158 PM PST Tue Jan 23 2018
Synopsis..expect mostly clear skies, seasonal temperatures and
dry weather conditions through Wednesday. Lingering northerly
breezes along the Colorado River valley can be expected into this
evening. A fast moving system will bring increasing southwest winds
and cooler temperatures to the area late Wednesday and Thursday.
Some shower activity can also be expected over the Sierra and
southern Great Basin Thursday and Thursday night.
Short term...today through Thursday.
High pressure over the area will shift east tonight as a trough of
low pressure over the Pacific northwest moves southeast. This
trough will bring increasing winds later Wednesday and Thursday.
Some precipitation can also be expected over the Sierra overnight
Wednesday spilling over into the far reaches of the northern County Warning Area
on Thursday and the northeast County Warning Area Thursday night. Precipitation
amounts look to be fairly light as this system quickly moves
across the area.
Most areas will see relatively light winds, clear skies and seasonal
temperatures through much of Wednesday. Gusty north winds 15-25
mph will affect the Colorado River valley this evening with local
wind gusts between 35 and 40 miles per hour. The winds will decrease tonight
with lighter winds expected on Wednesday.
The next system will bring increasing winds late Wednesday and
Wednesday night to the Sierra and northwest County Warning Area. The winds look
like they will stay below high wind levels. However, there is
potential for advisory level winds across San Bernardino, Clark
and Mohave counties Thursday afternoon.
Long term...Friday through Tuesday.
No significant weather impacts are expected Friday through
Monday. There is some indication of strong winds developing late
Tuesday with a cold low pressure system possibly diving into the
Great Basin, but confidence is low at this time.
The system moving through the area on Thursday will be clearing
our area Friday morning followed by a ridge developing over the
region through the weekend. Some cooling is expected Friday before
a warming trend lasts into next week. Highs across the Mojave
Desert zones will generally climb into the mid 60s and lower 70s
by Sunday. Typical breezy to windy conditions under the area of
high pressure can be expected along the Colorado River valley from
Laughlin-Bullhead City to Lake Havasu.
Models do show a fast moving cold front moving over Nevada later
on Tuesday which would bring a return to breezy to windy
conditions. This will be the main feature to watch in the
Aviation...for McCarran...variable winds generally less than 7
knots can be expected through Wednesday afternoon under occasional
high clouds. Winds will likely favor a northeasterly direction late
this afternoon with a shift to a south-southwesterly direction this
evening through Wednesday afternoon.
For the rest of southern Nevada, northwest Arizona and southeast
California...most of the region will see variable winds 10 knots or
less through Wednesday afternoon under occasional high clouds. The
exception is along the Colorado River valley from Laughlin-Bullhead
City southward where northerly gusts of 20-30 knots can be expected
through this afternoon. Winds are expected to gradually weaken
Spotter information statement...spotters are encouraged to report
any significant weather or impacts according to Standard operating