755
FXUS65 KFGZ 080456
AFDFGZ
Area Forecast Discussion
National Weather Service Flagstaff AZ
956 PM MST Sun Sep 7 2025
.SYNOPSIS...Dry and warm conditions for the start of the work
week. Fall-like weather is expected to set in midweek with breezy
and cooler weather and a slight chance for showers and
thunderstorms.
&&
.DISCUSSION...High pressure remains in place over Arizona today,
keeping temperatures fairly typical for this time of year. The 18Z
FGZ RAOB shows a notable decrease in PWAT today (0.43") as drier
air aloft sets in. Some mid-level capping also looks to have
developed, further limiting precipitation development. Nevertheless,
some linger moisture in the low-levels may be just enough for a
couple isolated showers and thunderstorms to develop this afternoon.
Any activity that does develop will be minimal, with some brief
heavy downpours and some gusty winds being the main threats.
Heights begin to fall through the upcoming week as a trough begins
to eject off the Pacific and move into the Great Basin. Temperatures
look to gradually cool by a degree or two each day through the
remainder of the forecast period. Winds also look to increase
through the period, likely peaking on Wednesday and Thursday as the
pressure gradient tightens over Arizona. Some moisture does look to
linger, thus, chances for isolated showers and storms look to
remain, especially across eastern Arizona through Thursday or
Friday. By the end of the week, behind the trough, much drier air
looks to set in. Ensemble guidance shows a significant decrease in
PWATs over the weekend, resulting in dry conditions for the vast
majority of the area.
&&
.AVIATION...Monday 08/06Z through Tuesday 09/06Z...Mainly VFR
conditions are forecast. Light and variable wind during the
evening and overnight periods, with SW to W winds 10-20 kts
18Z-02Z. An isolated -SHRA or -TSRA possible in southern Yavapai
County and the White Mountains on Monday afternoon with less than
10% areal coverage.
OUTLOOK...Tuesday 09/06Z through Thursday 11/06Z...VFR conditions
expected. Daytime SW winds 10-20 kts with gusts 25-30 kts
Tuesday, increasing to 15-20 kts gusting 30-35 kts Wednesday.
Winds decreasing to 5-15 kts during the late evening and overnight
periods.
&&
.FIRE WEATHER...Monday and Tuesday...Mainly dry and warmer. A
stray shower or thunderstorm will be possible over the White
Mountains. Light southwest winds at 5-15 mph with gusts to 20 mph on
Monday will strengthen to 10-20 mph with gusts to 25 mph on Tuesday.
Minimum RH values 15-30% each day.
Wednesday through Friday...A passing weather disturbance will result
in a slight moisture increase and stronger winds. Look for a return
of isolated showers and thunderstorms primarily east of a Payson to
Page line. South to southwest winds at 15 to 25 mph with gusts to 30
mph are forecast on Wednesday and Thursday then diminishing to 5-15
mph gusting to 20 mph on Friday. Turning a bit cooler.
&&
.FGZ WATCHES/WARNINGS/ADVISORIES...None.
&&
$$
PUBLIC...Humphreys
AVIATION...JJ
FIRE WEATHER...McCollum
For Northern Arizona weather information visit
weather.gov/flagstaff
NWS Flagstaff Office
Tucson, AZ 
