Weather Service Report

FXUS65 KPSR 031654

Area Forecast Discussion
National Weather Service Phoenix AZ
954 AM MST Sat Dec 3 2016

A strong surface pressure gradient will continue to produce gusty
northerly winds across a large portion of southeast California and
the Colorado River Valley through this afternoon. Otherwise, high
pressure building into the region will result in warmer conditions
through Tuesday. Another low pressure system will bring a brief cool
down Wednesday before a return to near-normal temperatures late in
the week and into the weekend.



Upper level low has spun a bit further east quicker than expected
with a long wave ridge folding into the Southwest behind it. Reduced
the minimal rain chance we had going for our eastern CWA and adjusted
cloud cover. This may allow us to warm a degree or so more than
previous forecast indicated. Otherwise wind forecast looks on track
with breezy/windy conditions across southeast California with
potential for blowing dust.


As the upper low drifts eastward this morning, strong subsidence
will overspread Arizona yielding mainly sunny skies. Meanwhile, a
ridge in the eastern Pacific will migrate eastward resulting in
increasing height/thicknesses and consequently temperatures generally
3 to 8 degrees warmer than those observed Friday. Additional
warming/drying is likely Sunday as the axis of the aforementioned
ridge moves into the Desert Southwest. Little change is then expected

Latest operational models are in generally good agreement through the
week, showing a weak short-wave trough moving through the region
Tuesday. A broad trough will then settle across the central states,
ushering in anomalously cold arctic air. The coldest of the air will
be displaced well to our east. Nevertheless, a weak short-wave trough
will result in cooler conditions and below normal temperatures across
the region Wednesday. Latest operational ECMWF suggests that light
precipitation will be possible across eastern Arizona including
portions of Gila County. However, this solution is supported by none
of the GEFS members. Late in the week and into the weekend, a warming
trend is likely as high pressure and ultimately zonal flow becomes
reestablished across the intermountain West.


South-Central Arizona including KPHX, KIWA, and KSDL:

Skies to remain mostly clear through the period with the exception of
some FEW to SCT Cu development during the daytime hours today. Light
winds this morning will be quite variable, but mostly out of the west
at KSDL and KPHX. Confidence in wind direction becomes somewhat low
by mid morning as winds should switch around to the northeast and
increase. These winds may last through mid afternoon before again
switching back to the northwest. Confidence is moderate to high winds
will shift back to the east mid to late evening and remain fairly
light overnight.

Southeast California/Southwest Arizona including KIPL and KBLH:

Clear skies to persist into Sunday, but winds will remain breezy to
windy through this afternoon. Northerly wind gusts will at times
reach 25-30 kts at both KBLH and KIPL, especially late morning
through mid afternoon. Moderate to high confidence winds will begin
to diminish shortly before sunset today, becoming light overnight. 

Aviation discussion not updated for amended TAFs.


Monday through Friday:
Near normal temperatures and mostly dry conditions are likely for
next week. A passing weather system to the north on Tuesday and
Wednesday will bring breezy afternoon winds in some areas Tuesday
and then down the Lower Colorado River Valley on Wednesday. Minimum
humidities on Monday and Tuesday will range from 25 to 35 percent,
but then drop starting Wednesday with readings down into the teens.
Generally light winds are expected for Thursday and Friday with
minimum humidities again mostly in the teens over the deserts.


Spotters are encouraged to report according to standard criteria.


AZ...Wind Advisory until 9 PM MST this evening for AZZ020-025.

CA...Wind Advisory until 8 PM PST this evening for CAZ030>033.



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