265
FXUS65 KPSR 102042
AFDPSR

Area Forecast Discussion
National Weather Service Phoenix AZ
142 PM MST Mon Nov 10 2025

.KEY MESSAGES...

- Unseasonably warm weather will persist through the middle of this
  week with near record high temperatures possible again today.

- A fast moving storm system is expected to arrive on Friday,
  bringing gusty winds, lower desert rain, and mountain snow.

- Temperatures are expected to cool well below normal this weekend
  with lower desert highs in the 60s and 70s and lows in the 40s
  and 50s.

&&

.SHORT TERM /Today through Thursday/...
The anomalously strong upper-lvl ridge, centered over the Great
Basin region, will begin to weaken over the next few days. However,
until then, 500mb heights today are between 588-591 dam, with the
higher heights predominately in the western portions of the lower
desert region. This will drive afternoon highs today to continue
to be 8-10 degrees above normal, with temperatures in the upper
80s for the Phoenix Metro area and up to 90 degrees out west, a
potential new record high for the Yuma and El Centro areas. High
temperatures over the next few days will trend ever so slightly
downwards, into the mid to upper 80s across the lower desert,
which will still be above normal as 500 mb heights will only weaken
to between 585-588 dam. The most noticeable change will be high
cirrus streaming into the forecast area today and tomorrow as the
low pressure system approaches, with cloud coverage becoming
thicker and more extensive by Wednesday and Thursday. Due to the
increasing mid-lvl height gradient associated with this trough
moving onshore, we will see increased breeziness Thursday
afternoon and evening across SE California and SW Arizona.


&&

.LONG TERM /Friday through Monday/...
Deterministic models and ensemble members have come into better
agreement regarding a storm system which will take aim on the
Desert Southwest on Friday. Most EPS and GEFS members show the
Pacific trough deepening over the Great Basin region early Friday
with several members developing a cutoff low before reaching
western AZ on Friday afternoon. Although there are subtle
differences in magnitude and timing within the suite of ensembles,
there is decent agreement that the system will progress through
the region on Friday and depart to the east by Saturday. Moisture
associated with this system still looks to be adequate with PWAT
values rising to around 150-200% of normal. There will also likely
be a strong sfc front that will sweep through the forecast area
from W to E which will provide a focus for lift and help foster
the development of showers and possible a few thunderstorms. NBM
PoPs continue to trend upward and are now 30-60% across southcentral
AZ from Friday morning through Friday night. In addition to the
increasing rain chances, another potential impact from this system
will be gusty winds. Latest model guidance indicates widespread
gusts reaching 25-35 mph with even higher gusts up to 40 mph
across SE California and SW Arizona Friday afternoon. These
stronger gusts could result in localized channels of blowing dust.

As the trough axis passes through the forecast area, we will see a
much cooler airmass being ushered in behind this system. In response,
high temperatures are expected to fall from the mid 80s on Thursday
to upper 60s to low 70s on Friday. Well below normal temperatures
will carry into the weekend making it feel much more fall-like.
Overnight lows will also tumble into the upper 40s to low 50s with
some locations across the high terrain areas NE of Phoenix
bottoming out in the upper 30s on Sunday morning. Cooler than
normal conditions will likely persist into early next week as long
range models indicate another shortwave trough arriving into the
Intermountain West on Monday.

&&

.AVIATION...Updated at 1732Z.

South Central Arizona including KPHX, KIWA, KSDL, and KDVT; and
Southeast California/Southwest Arizona including KIPL and KBLH:

No aviation weather concerns are anticipated through the TAF
period. Confidence remains high that winds will maintain an
easterly component across the PHX metro through tomorrow morning
with periods of variability. Breezy easterly winds gusting upwards
of 18-20 kts this morning will taper off going into this
afternoon. Across SE CA, winds will predominantly favor the W at
KIPL and vary between the NE to NW at KBLH, with extended periods
of variability to nearly calm conditions at the terminals. Skies
will remain clear through early this evening before high cirrus
clouds increase in coverage from W to E late tonight into early
Tuesday.

&&

.FIRE WEATHER...
Warm and dry conditions with above normal temperatures will
persist through Thursday before a weather system brings cooler
temperatures and chances for wetting rains to the area on Friday.
Afternoon minRHs will mainly range between 15-20% each afternoon
through Thursday before improving to 35-40% on Friday and through
the weekend. Overnight recoveries will range from poor to fair
over the next several nights, with much better moisture recovery
up to 60-80% Thursday night into Friday. Winds will be light,
generally less than 15 mph and follow typical diurnal patterns
through most of this week, however breezy to locally windy
conditions are expected to develop across the western districts
Thursday and Friday.

&&

.PSR WATCHES/WARNINGS/ADVISORIES...
AZ...None.
CA...None.
&&

$$

SHORT TERM...Ryan
LONG TERM...Salerno
AVIATION...Smith/Salerno
FIRE WEATHER...Ryan/Salerno