362
FXUS65 KFGZ 182038
AFDFGZ

Area Forecast Discussion
National Weather Service Flagstaff AZ
138 PM MST Tue Nov 18 2025

.SYNOPSIS...Cold and wet conditions will dominate the next few
days, with more unsettled weather possible over the weekend. Rain
looks to be the main precipitation type, but high elevation snow
will sneak in by mid-week.

&&

.DISCUSSION...The upper low is centered near southern California
this afternoon, with plentiful moisture continuing to push
northward into Arizona. Large scale lift and some instability have
been maximized along/west of I-17 and especially south central
Yavapai County where rainfall totals since late Monday are in the
1.00" to 2.50" range, with moderate rain continuing at this time.
As the upper low slowly pushes eastward into western Arizona by
Wednesday afternoon, additional disturbances will rotate northward
into the western half of the state and bring the threat of
additional moderate to locally heavy rainfall. Yavapai County
still looks favored for some of the heaviest rain, with additional
amounts of 1-2 inches and localized areas of 2+ inches especially
over favored upslope regions. For this reason, we have issued a
Flood Watch for Yavapai County through Wednesday afternoon. The
other aspect to this system will be high elevation snowfall. The
latest forecasts keep the snow level near 8000 feet through mid
day Wednesday, then values gradually drop as the upper low moves
into the area later Wednesday afternoon through Thursday. So by
Wednesday evening into especially Thursday morning, there will be
a chance of snow down to the 6500-7000 ft level which would
include portions of I-40 (Williams to east Flagstaff) and I-17
(Flagstaff to around Munds Park). By this time, much of the
heavier precipitation will have moved into eastern Arizona where
snow levels will be higher. Our latest forecasts call for some
light snow along the Mogollon Rim above about 6500 feet, mostly in
the half to 2 inch range and again the most likely timing is
Wednesday evening into Thursday morning. Higher parts of the
Kaibab Plateau, San Francisco Peaks, and White Mountains will see
heavier amounts of 4-8"+ but these are mostly higher than the
populated areas. Our current system will be getting moved east out
of our area due to an upstream low approaching from the
northwest. Much of the model and ensemble data take this low
pretty far south, into northern Baja Fri/Sat before ejecting
northeastward by Sunday. Thus the more favorable areas for
additional precipitation are over southern Arizona, but we`ll have
to keep an eye on the late weekend period for a chance of
rain/high elevation snow. Current PoPs are 20-40%, favoring I-40
south.

&&

.AVIATION...Tuesday 18/18Z through Wednesday 19/18Z...MVFR-LIFR
conditions west of AZ-87 corridor with numerous rain showers
throughout the time period. KFLG could see some snow mix in after
12Z Wednesday morning with snow levels dropping to 7000-7500
feet. VFR- MVFR conditions east of AZ-87 corridor, a few showers
are possible, but most of the activity will be further west. Winds
S-SW 10-15kts, gusts to 20kts rest of the day period, light and
variable overnight.

OUTLOOK...Wednesday 19/18Z through Friday 21/18Z...Conditions
could range from VFR all the way down to IFR over the next few
days as scattered showers continue throughout the period, becoming
more isolated by Friday morning. Snow levels start at 7000-7500ft,
lowering to 6000-6500ft by Friday morning. Winds S-SW 5-10kts
daytime, light and variable or terrain driven overnight.

&&

.FIRE WEATHER...Wednesday through Thursday...Scattered to widespread
showers expected Wednesday and Thursday with the snow level lowering
to 7500 feet by Wednesday morning and 6500-7000 feet by Thursday
morning. Winds S-SW 10-15 mph with gusts as high as 25 mph both days.

Friday through Sunday...A chance for isolated to scattered showers
continues through the weekend, mainly south of the I-40 corridor.
Snow level 7000-8000ft. Winds E-SE 5-10 mph on Friday and Saturday,
becoming N 5-10 mph on Sunday.

&&

.FGZ WATCHES/WARNINGS/ADVISORIES...
Flood Watch through Wednesday afternoon for AZZ008-037.

&&

$$

PUBLIC...JJ
AVIATION...Bernhart
FIRE WEATHER...Bernhart

For Northern Arizona weather information visit
weather.gov/flagstaff