FXUS65 KPSR 230502

Area Forecast Discussion
National Weather Service Phoenix AZ
1002 PM MST Tue Jan 22 2019

Updated Aviation section.


Gusty winds will continue today across the Lower Colorado River
Valley and southeast California with lighter winds elsewhere. For
the rest of the week, high pressure centered to the west of the
region will keep dry conditions over the region while temperatures
slowly rise to just above normal readings by Friday.


/Issued 201 PM MST/101 PM PST/
A low pressure system that has skirted off to our east means dry
northwesterly flow aloft will continue over the area resulting in
not just clear skies but also windy conditions, particularly along
the Colorado River Valley and portions of southeast California.
Folks can expect Gusts up to 30 MPH and stronger to dominate the
afternoon. Fortunately, those exceptional winds should subside
after sunset. As such, a Wind Advisory for that area will remain
in effect until this evening. Otherwise, folks should expect
generally cooler temperatures as a colder northern airmass sinks
in over the Southwest. High temps will fall a few degrees below
seasonal normal values but the morning low temperatures on
Wednesday will likely be the lowest folks have seen in the last
several days.

Over the next few days, high pressure ridging will take form over
the area despite a few shortwaves circulating around the northern
periphery of the ridge. These waves will be dry and do little
other than to induce a tighter pressure gradient resulting in some
stronger afternoon breezes. Nevertheless, we shall enjoy a
warming trend warming into the low 70's by the end of this week
lasting through the weekend.


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

Surface winds tonight and Wednesday morning will generally be
light but with a lot of directional variability. Anticipate light
westerly winds to develop by mid to late afternoon. In the lower
levels above the surface, moderate to strong northeasterly winds
during the late evening and early morning hours will weaken and
become easterly by sunrise. Otherwise, skies will be clear.

Southeast California/Southwest Arizona including KIPL and KBLH:

Northerly surface winds will be favored - especially along/near
the Lower Colorado River Valley where occasional gusts of 20-25
kts can be expected until about 09Z. In the lower levels above the
surface, strong northerly winds late this evening will slowly
weaken overnight and during the day Wednesday (trending
northwesterly). Otherwise, skies will be clear.

Aviation Discussion not updated for amended TAFs.


Thursday through Monday:
Dry conditions under high pressure aloft will dominate through the
period. Near normal temperatures on Thursday will rise through the
end of the week reaching above normal by Friday. Humidity readings
will remain fairly stable dipping down to between 15 to 25 percent
each day. Winds will generally be light through the weekend,
favoring the north over the deserts west of Phoenix at speeds up to
15 mph. Stronger north winds are possible Monday especially over far
southeast California and along the lower Colorado River Valley.


Spotters should follow standard reporting procedures.




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