Scientific Forecaster Discussion
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Area forecast discussion
National Weather Service Las Vegas Nevada
924 PM PST Mon Dec 9 2019
Synopsis...a dry weather pattern with considerable high clouds
can be expected through Friday. The next chance for precipitation
looks to be Saturday and should be confined mainly to the southern
Sierra and central Nevada. Temperatures will be near or slightly
above average through the week.
Update...the last of the high clouds has exited the far southern
areas of the County Warning Area leaving clear skies areawide overnight. We will
start to see high clouds re-enter the forecast area after sunrise
Tuesday with broken to overcast high clouds expected by afternoon.
Current forecast in good shape and no updates planned.
235 PM PST Mon dec9 2019
Discussion...through next Monday.
A progressive weather pattern will continue over the western states
the next several days, but impacts look fairly minimal for our
region. An amplified ridge moving overhead through Tuesday night
will be followed by a fast moving open trough that slides from the
southern Sierra across southern Nevada Wednesday afternoon.
Considerable high clouds will precede the disturbance which will
limit sunshine and thus hold afternoon temps back a little Tuesday
The next feature of interest comes into view late Friday and
Saturday when the tail end of a Pacific moisture plume brushes the
southern Sierra and southern Great Basin as the base of a broad
trough slowly digs over southern Nevada through Sunday then pulls
away to The Four Corners on Monday. The orientation of the moisture
will lead to chances of precipitation primarily over the southern
Sierra and Lincoln/northern Mohave counties on Saturday while
chances across the rest of the region are too slim to mention for
now. Winds do increase across the southern Sierra crest Thursday
through Saturday. Confidence in any significant downslope winds is
low for now, but it will be something to keep an eye on. High temps
will be running close to normal and will only vary 3-5 degrees the
rest of the week.
Aviation...for McCarran...a ridge of high pressure moving
overhead will provide tranquil weather through Tuesday with
increasing clouds above 20 kft. Winds will become southwest around 5-
7 knots this evening through the overnight hours then will become
light and variable Tuesday.
For the rest of southern Nevada, northwest Arizona and southeast
California...a ridge of high pressure moving over the region will
provide VFR conditions with considerable clouds above 20
kft and generally light winds through Tuesday.
Spotter information statement...spotters are encouraged to report
any significant weather or impacts according to Standard operating