Area Forecast Discussion
Issued by NWS Tucson, AZ

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605
FXUS65 KTWC 081534
AFDTWC

Area Forecast Discussion
National Weather Service Tucson AZ
834 AM MST Tue Jul 8 2025

.SYNOPSIS...Low-grade monsoon pattern this week with most of the
daily storm activity being east and south of Tucson. Hotter
daytime temperatures through Thursday with Wednesday likely the
hottest day this week where an Extreme Heat Warning is in effect.

&&

.DISCUSSION...Mostly sunny skies this morning with the exception of
western Cochise, Santa Cruz and portions of eastern Pima County
where there is a pocket of considerable mid level cloudiness. The
mid/upper level pattern this morning consists of an area of high
pressure at 500mb centered over south central Arizona with the 250mb
high displaced a bit further south near to just south of the
international border. Lower level storm motion/steering flow today
will be towards the west to southwest. PWAT values range from 0.8
inches over the White Mountains to about 1.3 inches over the western
deserts. With the mid/upper level high nearby providing some
subsidence aloft, the ongoing forecast thinking of a low grade
monsoon pattern remains intact. This is reflected the latest 12Z
HREF/CAMS which show the bulk of the thunderstorm activity this
afternoon forming near or just south of the international border
from Nogales eastward with a secondary area across the higher
terrain of Graham/Greenlee County and adjacent Gila region in NM.
These storms will attempt to push southwest off the higher terrain
before eventually weakening. Elsewhere just some isolated storms
that will try to form on the higher terrain. Main concern today will
be strong gusty winds considering the DCAPEs of 1200-1800 J/KG. A
few heavy downpours and locally heavy rain primarily in the more
moisture laden airmass down near the international border. Current
forecast looks in good shape. No updates. See previous discussion
for additional information.

&&

.AVIATION...Valid through 08/12Z.
SKC to FEW-SCT 12-15k ft AGL thru 08/18z, then SCT-BKN 7-12k ft
AGL with ISOLD-SCT -SHRA/-TSRA mainly S/SE of KTUS thru 09/04Z with
CIGS BKN 5-8k ft AGL and gusty outflow up to 45 kts. Skies will then
become SKC-FEW 12-15k ft AGL overnight. SFC winds generally WLY 8-13
kts. Aviation discussion not updated for TAF amendments.

&&

.FIRE WEATHER...Although Southeast Arizona will be experiencing a
low-grade monsoon pattern this week, isolated to low-end scattered
thunderstorm coverage is expected to the south and southeast of
Tucson for the next several days. The main threat for storms will
be the potential for strong gusty and erratic outflow winds 40-45
mph. Otherwise, an eventual uptick in monsoon activity is possible
the second half of the week into next weekend as the upper high
shifts to a more favorable location aloft. Temperatures will be
above normal this week with hottest temperatures mid- week. Winds
generally light and under 15 mph with the exception of gusty and
erratic winds up to 35-45 mph near any thunderstorms.

&&

.PREV DISCUSSION...Satellite imagery this morning showed clear to
partly cloudy skies across the area. The 08/00z 500 mb chart placed
strong upper high between Tucson and El Paso. This high will be the
dominate weather maker this week as it strengthens over the state,
bringing hotter daytime temperatures through Thursday and keeping
the area in a low-grade monsoon pattern into this weekend with most
of the daily storm activity being east and south of Tucson.

With low-grade monsoon pattern this week will highlight the
potential activity for today. Isolated to widely scattered
thunderstorms this afternoon/evening will be east and south of
Tucson with 08/00z HREF focusing the threat of a few severe
thunderstorms over southeast Graham and southern Greenlee counties
where inverted-v profiles will exist with DCAPE values between 1800-
1900 j/kg mid-afternoon to early evening. HREF has 10% neighborhood
probability for wind gusts in excess of 50 kts over SE Graham, SRN
Greenlee and NE Cochise. Yesterday there was some blowing dust near
San Simon and can see that happening again later this afternoon into
this evening. Matched up with El Paso with highlighting this area,
especially along I-10 east of Willcox, for blowing dust.

Temperatures: Hottest day of the week will be tomorrow (Wed) where
there is an Excessive Heat Warning in effect. See climate section
below for listing of locations that will be near July 9th record
highs. After Thursday, highs cool a bit but will remain 2-5 degrees
above normal.

&&

.CLIMATE...RECORD OR NEAR RECORD HIGH TEMPERATURES WEDNESDAY

DATE                         Jul 09
                          FCST RCD/YR
TUCSON INTL AIRPORT       110  111/2024
AJO                       113  116/2024
ORGAN PIPE CACTUS         111  116/1958
PICACHO PEAK              109  113/1994
SAFFORD AG STATION        110  108/2024
SIERRA VISTA FD           101  104/2024
TOMBSTONE                 102  106/1979
WILLCOX                   105  109/2003

&&

.TWC WATCHES/WARNINGS/ADVISORIES...
 Extreme Heat Warning from 10 AM to 8 PM MST Wednesday for
  AZZ501-502-504>506-509.

&&

$$

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