307 
FNUS55 KPSR 211034
FWFPSR

Fire Weather Planning Forecast for Southwest and South-Central
Arizona and Southeast California
National Weather Service Phoenix AZ
334 AM MST Thu Aug 21 2025

.DISCUSSION...
Well above normal temperatures are expected through at least the 
next couple of days as temperatures approach record levels.
Additionally, moisture will continue to increase across the area,
leading to increasing thunderstorm chances. Best shower and storm
chances this afternoon and evening will be across the higher 
terrain east of Phoenix (30-60%), however there is a 10-20% 
chance that some isolated showers and storms could survive into 
the lower deserts of south-central AZ, including the Phoenix 
Metro. Tomorrow, shower and storm chances move into SE CA and SW 
AZ, with a 30-50% chance across the higher terrain east of 
Phoenix, a 20-30% chance across the lower deserts of south-
central AZ, including Phoenix, and a 20-40% chance across SE CA 
and SW AZ. The primary threats with any stronger thunderstorms 
will be localized heavy downpours, lightning, and gusty, erratic 
outflow winds. Chances for seeing outflow wind gusts in excess of 
35 mph today (tomorrow) climb upwards of 70% (30-50%) for southern
Gila, eastern Maricopa, and NW Pinal Counties, with a 10% chance 
of seeing gusts in excess of 58 mph today and tomorrow. Outside of
any thunderstorms, winds will overall continue to favor diurnal 
upslope/downvalley patterns with occasional afternoon gusts around
15-20 mph. Min RHs will remain around 15-25% over the next couple
of days, while overnight Max RHs increase to upwards of 30-50% 
for most areas.

...Thunderstorms imply gusty winds...

Note...Additional Fire Weather Forecast information can be found
in the Area Forecast Discussion. See product PHXAFDPSR.

AZZ132-212245-
West Central Deserts/Northwest Maricopa County/Greater Phoenix
Area/Southwest Deserts/Southwest Maricopa County/
Northwest and North-Central Pinal County-
Phoenix BLM/YUM BLM/CAZ-CRZ-
334 AM MST Thu Aug 21 2025

.TODAY...
* Sky/weather.....................Sunny. 
* Max Temperature.................108-114. 
*    24 hr trend..................Little change. 
* Min Humidity....................13-18 pct. 
*    24 hr trend..................3 pct wetter. 
* Winds - 20 foot...Slope/Valley..Southeast 5 to 10 mph in the 
  morning becoming southwest in the afternoon. 
* Winds...10000 FT MSL............Southeast 5 to 15 mph in the 
  morning becoming light and variable in the afternoon. 
* Chance of Precip................10 percent. 
* CWR (>= 0.10 IN)................0 percent. 
* Chance of Thunder...............13 percent. 
* Mixing Height for Phoenix.......10600 ft AGL. 
* Transport Wind for Phoenix......Southwest 7 knots. 
* Dispersion for Phoenix..........Fair. 

.TONIGHT...
* Sky/weather.....................Partly cloudy. Slight chance of 
  showers and thunderstorms. 
* Min Temperature.................84-94. 
*    24 hr trend..................Little change. 
* Max Humidity....................33-46 pct. 
*    24 hr trend..................4 pct wetter. 
* Winds - 20 foot...Slope/Valley..Southeast 5 to 15 mph. 
* Winds...10000 FT MSL............Northeast 10 to 15 mph. 
* Chance of Precip................10 percent. 
* CWR (>= 0.10 IN)................0 percent west portion...10 
  percent east portion. 
* Chance of Thunder...............14 percent. 

.FRIDAY...
* Sky/weather.....................Partly sunny. Slight chance of 
  showers and thunderstorms in the morning becoming chance of 
  showers and thunderstorms in the afternoon. 
* Max Temperature.................106-112. 
*    24 hr trend..................Little change. 
* Min Humidity....................16-21 pct. 
*    24 hr trend..................3 pct wetter. 
* Winds - 20 foot...Slope/Valley..Southeast 5 to 10 mph in the 
  morning becoming southwest in the afternoon. 
* Winds...10000 FT MSL............Northeast 5 to 15 mph in the 
  morning becoming light and variable in the afternoon. 
* Chance of Precip................20 percent. 
* CWR (>= 0.10 IN)................0 percent. 
* Chance of Thunder...............23 percent. 
* Mixing Height for Phoenix.......9900 ft AGL. 
* Transport Wind for Phoenix......South 5 knots. 
* Dispersion for Phoenix..........Fair. 


.EXTENDED...
.SATURDAY...Partly cloudy with chance of showers and slight
chance of thunderstorms. Lows 82-92. Highs 105-111. Southwest
winds 5 to 10 mph. 
.SUNDAY...Partly cloudy with chance of showers and slight chance
of thunderstorms. Lows 81-91. Highs 104-110. South winds 5 to
10 mph. 
.MONDAY...Partly cloudy with chance of showers and slight chance
of thunderstorms. Lows 78-88. Highs 100-105. Southwest winds 5 to
15 mph. 
.TUESDAY...Mostly cloudy with chance of showers and
thunderstorms. Lows 75-85. Highs 94-100. 
.WEDNESDAY...Partly cloudy with chance of showers and
thunderstorms. Lows 75-85. Highs 92-99. 

$$

AZZ131-CAZ231-212245-
Yuma/Martinez Lake and Vicinity/Lower Colorado River Valley AZ-
Lower Colorado River Valley CA-
334 AM MST Thu Aug 21 2025 /334 AM PDT Thu Aug 21 2025/

.TODAY...
* Sky/weather.....................Mostly sunny. 
* Max Temperature.................110-115. 
*    24 hr trend..................Little change. 
* Min Humidity....................14-18 pct. 
*    24 hr trend..................3 pct wetter. 
* Winds - 20 foot...Slope/Valley..South 5 to 15 mph. 
* Winds...10000 FT MSL............Southeast 10 to 20 mph. 
* Chance of Precip................0 percent. 
* CWR (>= 0.10 IN)................0 percent. 
* Chance of Thunder...............0 percent. 
* Mixing Height for Yuma..........8300 ft AGL. 
* Transport Wind for Yuma.........South 8 knots. 
* Dispersion for Yuma.............Good. 

.TONIGHT...
* Sky/weather.....................Mostly clear. Slight chance of 
  showers and thunderstorms after midnight. 
* Min Temperature.................85-90. 
*    24 hr trend..................Little change. 
* Max Humidity....................34-52 pct. 
*    24 hr trend..................6 pct wetter. 
* Winds - 20 foot...Slope/Valley..South 5 to 15 mph. 
* Winds...10000 FT MSL............East 10 to 20 mph. 
* Chance of Precip................10 percent. 
* CWR (>= 0.10 IN)................0 percent. 
* Chance of Thunder...............10 percent. 

.FRIDAY...
* Sky/weather.....................Partly sunny. Slight chance of 
  showers and thunderstorms in the morning becoming chance of 
  showers and thunderstorms in the afternoon. 
* Max Temperature.................109-114. 
*    24 hr trend..................Little change. 
* Min Humidity....................17-22 pct. 
*    24 hr trend..................4 pct wetter. 
* Winds - 20 foot...Slope/Valley..South 5 to 15 mph. 
* Winds...10000 FT MSL............East 5 to 15 mph in the morning 
  becoming light and variable in the afternoon. 
* Chance of Precip................30 percent. 
* CWR (>= 0.10 IN)................0 percent. 
* Chance of Thunder...............25 percent. 
* Mixing Height for Yuma..........9200 ft AGL. 
* Transport Wind for Yuma.........South 9 knots. 
* Dispersion for Yuma.............Good. 


.EXTENDED...
.SATURDAY...Partly cloudy with chance of showers and
thunderstorms. Lows 84-89. Highs 107-112. South winds 5 to
15 mph. 
.SUNDAY...Partly cloudy with chance of showers and slight chance
of thunderstorms. Lows 83-88. Highs 106-111. South winds 5 to
15 mph. 
.MONDAY...Partly cloudy with chance of showers and slight chance
of thunderstorms. Lows 80-87. Highs 101-106. South winds 5 to
15 mph. 
.TUESDAY...Partly cloudy with chance of showers and
thunderstorms. Lows 76-84. Highs 97-102. 
.WEDNESDAY...Partly cloudy with chance of showers and
thunderstorms. Lows 76-81. Highs 97-102. 

$$

AZZ133-212245-
Southern Gila County/Tonto National Forest Foothills-
Southern Tonto NF/West San Carlos BIA/South Portion Ft Apache BIA/
CAZ-
334 AM MST Thu Aug 21 2025

.TODAY...
* Sky/weather.....................Sunny in the morning becoming 
  partly sunny in the afternoon. Chance of showers and 
  thunderstorms in the afternoon. 
* Max Temperature.................91-108. 
*    24 hr trend..................Little change. 
* Min Humidity....................17-27 pct. 
*    24 hr trend..................Little change. 
* Winds - 20 foot...Slope/Valley..East 5 to 10 mph in the morning 
  becoming south 5 to 15 mph in the afternoon. 
* Winds...10000 FT MSL............Light and variable. 
* Chance of Precip................0 percent in the morning becoming 
  40 percent in the afternoon. 
* CWR (>= 0.10 IN)................10 percent. 
* Chance of Thunder...............39 percent. 

.TONIGHT...
* Sky/weather.....................Partly cloudy. Slight chance of 
  showers and thunderstorms. 
* Min Temperature.................66-85. 
*    24 hr trend..................Little change. 
* Max Humidity....................43-65 pct. 
*    24 hr trend..................Little RH change. 
* Winds - 20 foot...Slope/Valley..Northeast 5 to 15 mph. 
* Winds...10000 FT MSL............Northeast 5 to 15 mph in the 
  evening becoming light and variable after midnight. 
* Chance of Precip................30 percent. 
* CWR (>= 0.10 IN)................10 percent. 
* Chance of Thunder...............32 percent. 

.FRIDAY...
* Sky/weather.....................Partly sunny. Slight chance of 
  showers and thunderstorms . 
* Max Temperature.................91-106. 
*    24 hr trend..................Little change. 
* Min Humidity....................17-26 pct. 
*    24 hr trend..................Little change. 
* Winds - 20 foot...Slope/Valley..Southeast 5 to 10 mph in the 
  morning becoming southwest in the afternoon. 
* Winds...10000 FT MSL............Light and variable. 
* Chance of Precip................20 percent. 
* CWR (>= 0.10 IN)................0 percent. 
* Chance of Thunder...............24 percent. 


.EXTENDED...
.SATURDAY...Partly cloudy with chance of showers and slight
chance of thunderstorms. Lows 65-85. Highs 91-106. East winds
5 to 15 mph. 
.SUNDAY...Partly cloudy with slight chance of showers and
thunderstorms. Lows 65-83. Highs 90-106. East winds 5 to 15 mph. 
.MONDAY...Partly cloudy with chance of showers and slight chance
of thunderstorms. Lows 63-82. Highs 89-102. Southwest winds 5 to
15 mph. 
.TUESDAY...Partly cloudy with chance of showers and
thunderstorms. Lows 62-79. Highs 83-97. 
.WEDNESDAY...Partly cloudy with chance of showers and
thunderstorms. Lows 60-77. Highs 79-94. 

$$

CAZ232-212245-
Imperial County And Eastern Riverside County-
334 AM PDT Thu Aug 21 2025

.TODAY...
* Sky/weather.....................Mostly sunny. 
* Max Temperature.................106-115. 
*    24 hr trend..................Little change. 
* Min Humidity....................12-17 pct. 
*    24 hr trend..................3 pct wetter. 
* Winds - 20 foot...Slope/Valley..Southeast 5 to 15 mph. 
* Winds...10000 FT MSL............Southeast 10 to 20 mph. 
* Chance of Precip................0 percent. 
* CWR (>= 0.10 IN)................0 percent. 
* Chance of Thunder...............0 percent. 

.TONIGHT...
* Sky/weather.....................Mostly clear. 
* Min Temperature.................85-91. 
*    24 hr trend..................Little change. 
* Max Humidity....................27-52 pct. 
*    24 hr trend..................8 pct wetter. 
* Winds - 20 foot...Slope/Valley..South 5 to 15 mph. 
* Winds...10000 FT MSL............Southeast 10 to 20 mph. 
* Chance of Precip................0 percent. 
* CWR (>= 0.10 IN)................0 percent. 
* Chance of Thunder...............0 percent. 

.FRIDAY...
* Sky/weather.....................Partly sunny. Slight chance of 
  showers and thunderstorms in the morning becoming chance of 
  showers and thunderstorms in the afternoon. 
* Max Temperature.................105-114. 
*    24 hr trend..................Little change. 
* Min Humidity....................14-21 pct. 
*    24 hr trend..................3 pct wetter. 
* Winds - 20 foot...Slope/Valley..South 5 to 15 mph. 
* Winds...10000 FT MSL............Southeast 10 to 20 mph in the 
  morning becoming light and variable in the afternoon. 
* Chance of Precip................30 percent. 
* CWR (>= 0.10 IN)................0 percent. 
* Chance of Thunder...............26 percent. 


.EXTENDED...
.SATURDAY...Partly cloudy with slight chance of showers and
thunderstorms. Lows 85-92. Highs 103-112. Southwest winds 5 to
10 mph. 
.SUNDAY...Partly cloudy with slight chance of showers and
thunderstorms. Lows 84-90. Highs 101-110. South winds 5 to
15 mph. 
.MONDAY...Partly cloudy with chance of showers and slight chance
of thunderstorms. Lows 79-89. Highs 97-106. South winds 5 to
15 mph. 
.TUESDAY...Partly cloudy with chance of showers and slight chance
of thunderstorms. Lows 76-86. Highs 93-102. 
.WEDNESDAY...Partly cloudy with chance of showers and slight
chance of thunderstorms. Lows 76-83. Highs 92-102. 

$$

CAZ230-212245-
Joshua Tree National Park-
334 AM PDT Thu Aug 21 2025

.TODAY...
* Sky/weather.....................Mostly sunny. 
* Max Temperature.................96-109. 
*    24 hr trend..................Little change. 
* Min Humidity....................13-17 pct. 
*    24 hr trend..................3 pct wetter. 
* Winds - 20 foot...Slope/Valley..North 5 to 10 mph in the morning 
  becoming south 5 to 15 mph in the afternoon. 
* Winds...10000 FT MSL............South 10 to 20 mph. 
* Chance of Precip................0 percent. 
* CWR (>= 0.10 IN)................0 percent. 
* Chance of Thunder...............0 percent. 

.TONIGHT...
* Sky/weather.....................Mostly clear. 
* Min Temperature.................77-87. 
*    24 hr trend..................Little change. 
* Max Humidity....................26-32 pct. 
*    24 hr trend..................7 pct wetter. 
* Winds - 20 foot...Slope/Valley..Southwest 5 to 10 mph in the 
  evening becoming west after midnight. 
* Winds...10000 FT MSL............Light and variable in the evening 
  becoming southeast 10 to 20 mph after midnight. 
* Chance of Precip................0 percent. 
* CWR (>= 0.10 IN)................0 percent. 
* Chance of Thunder...............0 percent. 

.FRIDAY...
* Sky/weather.....................Partly sunny. Chance of showers 
  and thunderstorms . 
* Max Temperature.................95-108. 
*    24 hr trend..................Little change. 
* Min Humidity....................16-21 pct. 
*    24 hr trend..................4 pct wetter. 
* Winds - 20 foot...Slope/Valley..West 5 to 10 mph in the morning 
  becoming south 5 to 15 mph in the afternoon. 
* Winds...10000 FT MSL............Southeast 5 to 15 mph in the 
  morning becoming light and variable in the afternoon. 
* Chance of Precip................40 percent. 
* CWR (>= 0.10 IN)................0 percent. 
* Chance of Thunder...............35 percent. 


.EXTENDED...
.SATURDAY...Showers likely and chance of thunderstorms. Lows
75-88. Highs 93-107. Southwest winds 5 to 15 mph. 
.SUNDAY...Partly cloudy with chance of showers and thunderstorms.
Lows 73-87. Highs 91-105. Southwest winds 5 to 15 mph. 
.MONDAY...Partly cloudy with chance of showers and thunderstorms.
Lows 70-85. Highs 87-101. Southwest winds 5 to 15 mph. 
.TUESDAY...Partly cloudy with chance of showers and
thunderstorms. Lows 66-81. Highs 84-97. 
.WEDNESDAY...Partly cloudy with chance of showers and
thunderstorms. Lows 66-78. Highs 83-96. 

$$

.8 TO 10 DAY OUTLOOK...Thursday August 28th through Saturday
August 30th:
Below normal temperatures and above median precipitation.