815
FNUS55 KPSR 291923
FWFPSR
FIRE WEATHER PLANNING FORECAST FOR SOUTHWEST AND SOUTH-CENTRAL
ARIZONA AND SOUTHEAST CALIFORNIA
NATIONAL WEATHER SERVICE PHOENIX AZ
1223 PM MST SAT AUG 29 2026
DISCUSSION
A PATTERN SHIFT THIS WEEKEND WILL LEAD TO INCREASING MOISTURE AND
VERY GOOD CHANCES FOR SHOWERS AND THUNDERSTORMS ACROSS THE EASTERN
DISTRICTS. GUSTY WINDS, HEAVY RAINFALL, AND LOCALIZED FLOODING
WILL ALL BE POSSIBLE ACROSS SOUTH-CENTRAL ARIZONA BEGINNING LATE
THIS AFTERNOON. THE WESTERN DISTRICTS WILL GENERALLY STAY DRY.
EXPECT MINRHS OF 15-20% TODAY AREAWIDE BEFORE RISING TO 25-35%
ACROSS THE EASTERN DISTRICTS STARTING SUNDAY. TEMPERATURES ARE
ALSO FORECAST TO DROP TO NEAR NORMAL READINGS STARTING SUNDAY.
..THUNDERSTORMS IMPLY GUSTY WINDS
NOTE...ADDITIONAL FIRE WEATHER FORECAST INFORMATION CAN BE FOUND
IN THE AREA FORECAST DISCUSSION. SEE PRODUCT PHXAFDPSR.
AZZ132-300730-
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-
1223 PM MST SAT AUG 29 2026
TONIGHT
* SKY/WEATHER.....................MOSTLY CLEAR. PATCHY BLOWING DUST
IN THE EVENING. SLIGHT CHANCE OF SHOWERS AND THUNDERSTORMS .
* MIN TEMPERATURE.................80-90.
* 24 HR TREND..................LITTLE CHANGE.
* MAX HUMIDITY....................50-63 PCT.
* 24 HR TREND..................11 PCT WETTER.
* WINDS - 20 FOOT...SLOPE/VALLEY..SOUTH 5 TO 15 MPH IN THE EVENING
BECOMING SOUTHEAST AFTER MIDNIGHT.
* WINDS...10000 FT MSL............SOUTHWEST 10 TO 20 MPH.
* CHANCE OF PRECIP................0 PERCENT.
* CWR (>= 0.10 IN)................0 PERCENT WEST PORTION...10
PERCENT EAST PORTION.
* CHANCE OF THUNDER...............7 PERCENT.
SUNDAY
* SKY/WEATHER.....................MOSTLY SUNNY. SLIGHT CHANCE OF
SHOWERS AND THUNDERSTORMS IN THE AFTERNOON.
* MAX TEMPERATURE.................100-107.
* 24 HR TREND..................5 DEGREES COOLER.
* MIN HUMIDITY....................24-31 PCT.
* 24 HR TREND..................7 PCT WETTER.
* WINDS - 20 FOOT...SLOPE/VALLEY..SOUTHEAST 5 TO 10 MPH IN THE
MORNING BECOMING SOUTHWEST 5 TO 15 MPH IN THE AFTERNOON.
* WINDS...10000 FT MSL............SOUTHWEST 10 TO 20 MPH.
* CHANCE OF PRECIP................0 PERCENT IN THE MORNING BECOMING
10 PERCENT IN THE AFTERNOON.
* CWR (>= 0.10 IN)................0 PERCENT.
* CHANCE OF THUNDER...............12 PERCENT.
* MIXING HEIGHT FOR PHOENIX.......11200 FT AGL.
* TRANSPORT WIND FOR PHOENIX......WEST 7 KNOTS.
* DISPERSION FOR PHOENIX..........VERY GOOD.
SUNDAY NIGHT
* SKY/WEATHER.....................PARTLY CLOUDY. CHANCE OF
THUNDERSTORMS IN THE EVENING. CHANCE OF SHOWERS . SLIGHT CHANCE
OF THUNDERSTORMS AFTER MIDNIGHT.
* MIN TEMPERATURE.................75-85.
* 24 HR TREND..................4 DEGREES COOLER.
* MAX HUMIDITY....................55-79 PCT.
* 24 HR TREND..................11 PCT WETTER.
* WINDS - 20 FOOT...SLOPE/VALLEY..SOUTH 5 TO 15 MPH.
* WINDS...10000 FT MSL............SOUTHWEST 10 TO 20 MPH.
* CHANCE OF PRECIP................30 PERCENT.
* CWR (>= 0.10 IN)................0 PERCENT WEST PORTION...40
PERCENT EAST PORTION.
* CHANCE OF THUNDER...............21 PERCENT.
MONDAY
* SKY/WEATHER.....................PARTLY SUNNY. CHANCE OF SHOWERS
AND SLIGHT CHANCE OF THUNDERSTORMS .
* MAX TEMPERATURE.................95-104.
* 24 HR TREND..................4 DEGREES COOLER.
* MIN HUMIDITY....................24-39 PCT.
* 24 HR TREND..................3 PCT WETTER.
* WINDS - 20 FOOT...SLOPE/VALLEY..SOUTH 5 TO 15 MPH.
* WINDS...10000 FT MSL............SOUTHWEST 10 TO 20 MPH.
* CHANCE OF PRECIP................30 PERCENT.
* CWR (>= 0.10 IN)................0 PERCENT WEST PORTION...20
PERCENT EAST PORTION.
* CHANCE OF THUNDER...............23 PERCENT.
* MIXING HEIGHT FOR PHOENIX.......9900 FT AGL.
* TRANSPORT WIND FOR PHOENIX......SOUTH 7 KNOTS.
* DISPERSION FOR PHOENIX..........GOOD.
EXTENDED
TUESDAY
MOSTLY CLEAR. LOWS 74-84. HIGHS 97-104. SOUTH WINDS
5 TO 15 MPH.
WEDNESDAY
MOSTLY CLEAR. LOWS 77-87. HIGHS 98-105. SOUTHWEST
WINDS 5 TO 15 MPH.
THURSDAY
MOSTLY CLEAR. LOWS 78-88. HIGHS 99-106. SOUTHWEST
WINDS 5 TO 15 MPH.
FRIDAY
MOSTLY CLEAR WITH SLIGHT CHANCE OF SHOWERS AND
THUNDERSTORMS. LOWS 78-88. HIGHS 99-106.
SATURDAY
MOSTLY CLEAR WITH SLIGHT CHANCE OF SHOWERS. LOWS
78-88. HIGHS 100-106.
AZZ131-CAZ231-300730-
YUMA/MARTINEZ LAKE AND VICINITY/LOWER COLORADO RIVER VALLEY AZ-
LOWER COLORADO RIVER VALLEY CA-
1223 PM MST SAT AUG 29 2026 /1223 PM PDT SAT AUG 29 2026/
TONIGHT
* SKY/WEATHER.....................MOSTLY CLEAR.
* MIN TEMPERATURE.................83-88.
* 24 HR TREND..................LITTLE CHANGE.
* MAX HUMIDITY....................45-61 PCT.
* 24 HR TREND..................5 PCT WETTER.
* WINDS - 20 FOOT...SLOPE/VALLEY..SOUTH 5 TO 15 MPH.
* WINDS...10000 FT MSL............SOUTHWEST 15 TO 25 MPH.
* CHANCE OF PRECIP................0 PERCENT.
* CWR (>= 0.10 IN)................0 PERCENT.
* CHANCE OF THUNDER...............2 PERCENT.
SUNDAY
* SKY/WEATHER.....................SUNNY.
* MAX TEMPERATURE.................104-109.
* 24 HR TREND..................3 DEGREES COOLER.
* MIN HUMIDITY....................19-27 PCT.
* 24 HR TREND..................3 PCT WETTER.
* WINDS - 20 FOOT...SLOPE/VALLEY..SOUTH 5 TO 15 MPH.
* WINDS...10000 FT MSL............SOUTHWEST 15 TO 25 MPH.
* CHANCE OF PRECIP................0 PERCENT.
* CWR (>= 0.10 IN)................0 PERCENT.
* CHANCE OF THUNDER...............5 PERCENT.
* MIXING HEIGHT FOR YUMA..........8800 FT AGL.
* TRANSPORT WIND FOR YUMA.........SOUTH 9 KNOTS.
* DISPERSION FOR YUMA.............VERY GOOD.
SUNDAY NIGHT
* SKY/WEATHER.....................MOSTLY CLEAR.
* MIN TEMPERATURE.................80-85.
* 24 HR TREND..................3 DEGREES COOLER.
* MAX HUMIDITY....................41-56 PCT.
* 24 HR TREND..................4 PCT DRIER.
* WINDS - 20 FOOT...SLOPE/VALLEY..SOUTH 5 TO 15 MPH.
* WINDS...10000 FT MSL............SOUTHWEST 15 TO 25 MPH.
* CHANCE OF PRECIP................10 PERCENT.
* CWR (>= 0.10 IN)................0 PERCENT.
* CHANCE OF THUNDER...............10 PERCENT.
MONDAY
* SKY/WEATHER.....................MOSTLY SUNNY.
* MAX TEMPERATURE.................101-106.
* 24 HR TREND..................3 DEGREES COOLER.
* MIN HUMIDITY....................18-24 PCT.
* 24 HR TREND..................LITTLE RH CHANGE.
* WINDS - 20 FOOT...SLOPE/VALLEY..SOUTH 5 TO 15 MPH.
* WINDS...10000 FT MSL............SOUTHWEST 15 TO 25 MPH.
* CHANCE OF PRECIP................0 PERCENT.
* CWR (>= 0.10 IN)................0 PERCENT.
* CHANCE OF THUNDER...............6 PERCENT.
* MIXING HEIGHT FOR YUMA..........8800 FT AGL.
* TRANSPORT WIND FOR YUMA.........SOUTH 10 KNOTS.
* DISPERSION FOR YUMA.............VERY GOOD.
EXTENDED
TUESDAY
MOSTLY CLEAR. LOWS 79-84. HIGHS 101-106. SOUTH WINDS
10 TO 20 MPH.
WEDNESDAY
MOSTLY CLEAR. LOWS 79-84. HIGHS 101-106. SOUTHWEST
WINDS 5 TO 15 MPH.
THURSDAY
MOSTLY CLEAR. LOWS 79-84. HIGHS 101-106. SOUTH WINDS
10 TO 20 MPH.
FRIDAY
MOSTLY CLEAR. LOWS 79-85. HIGHS 102-107.
SATURDAY
MOSTLY CLEAR. LOWS 80-85. HIGHS 102-107.
AZZ133-300730-
SOUTHERN GILA COUNTY/TONTO NATIONAL FOREST FOOTHILLS-
SOUTHERN TONTO NF/WEST SAN CARLOS BIA/SOUTH PORTION FT APACHE BIA/
CAZ-
1223 PM MST SAT AUG 29 2026
TONIGHT
* SKY/WEATHER.....................PARTLY CLOUDY. CHANCE OF
THUNDERSTORMS IN THE EVENING. CHANCE OF SHOWERS . SLIGHT CHANCE
OF THUNDERSTORMS AFTER MIDNIGHT.
* MIN TEMPERATURE.................66-81.
* 24 HR TREND..................3 DEGREES COOLER.
* MAX HUMIDITY....................56-78 PCT.
* 24 HR TREND..................15 PCT WETTER.
* WINDS - 20 FOOT...SLOPE/VALLEY..NORTHWEST 5 TO 15 MPH IN THE
EVENING BECOMING NORTHEAST 5 TO 10 MPH AFTER MIDNIGHT.
* WINDS...10000 FT MSL............SOUTHWEST 10 TO 20 MPH.
* CHANCE OF PRECIP................50 PERCENT.
* CWR (>= 0.10 IN)................40 PERCENT.
* CHANCE OF THUNDER...............37 PERCENT.
SUNDAY
* SKY/WEATHER.....................PARTLY SUNNY. SLIGHT CHANCE OF
SHOWERS AND THUNDERSTORMS .
* MAX TEMPERATURE.................87-102.
* 24 HR TREND..................5 DEGREES COOLER.
* MIN HUMIDITY....................26-38 PCT.
* 24 HR TREND..................10 PCT WETTER.
* WINDS - 20 FOOT...SLOPE/VALLEY..NORTHEAST 5 TO 10 MPH IN THE
MORNING BECOMING WEST IN THE AFTERNOON.
* WINDS...10000 FT MSL............SOUTHWEST 10 TO 15 MPH.
* CHANCE OF PRECIP................40 PERCENT.
* CWR (>= 0.10 IN)................10 PERCENT.
* CHANCE OF THUNDER...............38 PERCENT.
SUNDAY NIGHT
* SKY/WEATHER.....................PARTLY CLOUDY IN THE EVENING
BECOMING MOSTLY CLOUDY AFTER MIDNIGHT. CHANCE OF THUNDERSTORMS IN
THE EVENING. CHANCE OF SHOWERS . SLIGHT CHANCE OF THUNDERSTORMS
AFTER MIDNIGHT.
* MIN TEMPERATURE.................63-76.
* 24 HR TREND..................4 DEGREES COOLER.
* MAX HUMIDITY....................73-93 PCT.
* 24 HR TREND..................15 PCT WETTER.
* WINDS - 20 FOOT...SLOPE/VALLEY..WEST 5 TO 10 MPH IN THE EVENING
BECOMING NORTHEAST AFTER MIDNIGHT.
* WINDS...10000 FT MSL............LIGHT AND VARIABLE IN THE EVENING
BECOMING SOUTHWEST 5 TO 15 MPH AFTER MIDNIGHT.
* CHANCE OF PRECIP................50 PERCENT.
* CWR (>= 0.10 IN)................60 PERCENT.
* CHANCE OF THUNDER...............42 PERCENT.
MONDAY
* SKY/WEATHER.....................MOSTLY CLOUDY. SLIGHT CHANCE OF
THUNDERSTORMS IN THE MORNING. SHOWERS LIKELY . CHANCE OF
THUNDERSTORMS IN THE AFTERNOON.
* MAX TEMPERATURE.................81-95.
* 24 HR TREND..................6 DEGREES COOLER.
* MIN HUMIDITY....................35-50 PCT.
* 24 HR TREND..................10 PCT WETTER.
* WINDS - 20 FOOT...SLOPE/VALLEY..EAST 5 TO 10 MPH IN THE MORNING
BECOMING SOUTHWEST IN THE AFTERNOON.
* WINDS...10000 FT MSL............SOUTHWEST 10 TO 15 MPH.
* CHANCE OF PRECIP................70 PERCENT.
* CWR (>= 0.10 IN)................60 PERCENT.
* CHANCE OF THUNDER...............38 PERCENT.
EXTENDED
TUESDAY
MOSTLY CLEAR WITH CHANCE OF SHOWERS AND SLIGHT CHANCE
OF THUNDERSTORMS. LOWS 61-78. HIGHS 84-98. NORTHWEST WINDS 5 TO
15 MPH.
WEDNESDAY
MOSTLY CLEAR. LOWS 62-79. HIGHS 86-100. NORTHWEST
WINDS 5 TO 15 MPH.
THURSDAY
PARTLY CLOUDY. LOWS 64-79. HIGHS 87-101. WEST WINDS
5 TO 15 MPH.
FRIDAY
PARTLY CLOUDY WITH SLIGHT CHANCE OF SHOWERS AND
THUNDERSTORMS. LOWS 64-80. HIGHS 87-101.
SATURDAY
PARTLY CLOUDY WITH SLIGHT CHANCE OF SHOWERS. LOWS
64-80. HIGHS 88-102.
CAZ232-300730-
IMPERIAL COUNTY AND EASTERN RIVERSIDE COUNTY-
1223 PM PDT SAT AUG 29 2026
TONIGHT
* SKY/WEATHER.....................CLEAR.
* MIN TEMPERATURE.................81-87.
* 24 HR TREND..................3 DEGREES COOLER.
* MAX HUMIDITY....................35-51 PCT.
* 24 HR TREND..................LITTLE RH CHANGE.
* WINDS - 20 FOOT...SLOPE/VALLEY..SOUTHWEST 5 TO 15 MPH.
* WINDS...10000 FT MSL............SOUTHWEST 20 TO 30 MPH.
* CHANCE OF PRECIP................0 PERCENT.
* CWR (>= 0.10 IN)................0 PERCENT.
* CHANCE OF THUNDER...............1 PERCENT.
SUNDAY
* SKY/WEATHER.....................SUNNY.
* MAX TEMPERATURE.................99-110.
* 24 HR TREND..................3 DEGREES COOLER.
* MIN HUMIDITY....................15-23 PCT.
* 24 HR TREND..................LITTLE RH CHANGE.
* WINDS - 20 FOOT...SLOPE/VALLEY..SOUTH 5 TO 15 MPH.
* WINDS...10000 FT MSL............SOUTHWEST 15 TO 25 MPH.
* CHANCE OF PRECIP................0 PERCENT.
* CWR (>= 0.10 IN)................0 PERCENT.
* CHANCE OF THUNDER...............1 PERCENT.
SUNDAY NIGHT
* SKY/WEATHER.....................MOSTLY CLEAR.
* MIN TEMPERATURE.................77-84.
* 24 HR TREND..................3 DEGREES COOLER.
* MAX HUMIDITY....................31-43 PCT.
* 24 HR TREND..................6 PCT DRIER.
* WINDS - 20 FOOT...SLOPE/VALLEY..WEST 5 TO 15 MPH.
* WINDS...10000 FT MSL............SOUTHWEST 20 TO 30 MPH.
* CHANCE OF PRECIP................0 PERCENT.
* CWR (>= 0.10 IN)................0 PERCENT.
* CHANCE OF THUNDER...............2 PERCENT.
MONDAY
* SKY/WEATHER.....................SUNNY.
* MAX TEMPERATURE.................97-107.
* 24 HR TREND..................3 DEGREES COOLER.
* MIN HUMIDITY....................14-21 PCT.
* 24 HR TREND..................LITTLE RH CHANGE.
* WINDS - 20 FOOT...SLOPE/VALLEY..SOUTHWEST 5 TO 15 MPH.
* WINDS...10000 FT MSL............SOUTHWEST 15 TO 25 MPH.
* CHANCE OF PRECIP................0 PERCENT.
* CWR (>= 0.10 IN)................0 PERCENT.
* CHANCE OF THUNDER...............2 PERCENT.
EXTENDED
TUESDAY
MOSTLY CLEAR. LOWS 77-84. HIGHS 95-105. SOUTHWEST
WINDS 10 TO 20 MPH.
WEDNESDAY
PARTLY CLOUDY. LOWS 77-84. HIGHS 95-105. WEST WINDS
10 TO 20 MPH.
THURSDAY
MOSTLY CLEAR. LOWS 77-84. HIGHS 96-106. SOUTHWEST
WINDS 5 TO 15 MPH.
FRIDAY
MOSTLY CLEAR. LOWS 77-85. HIGHS 97-107.
SATURDAY
MOSTLY CLEAR WITH SLIGHT CHANCE OF SHOWERS AND
THUNDERSTORMS. LOWS 79-85. HIGHS 97-106.
CAZ230-300730-
JOSHUA TREE NATIONAL PARK-
1223 PM PDT SAT AUG 29 2026
TONIGHT
* SKY/WEATHER.....................MOSTLY CLEAR.
* MIN TEMPERATURE.................68-82.
* 24 HR TREND..................4 DEGREES COOLER.
* MAX HUMIDITY....................36-50 PCT.
* 24 HR TREND..................3 PCT WETTER.
* WINDS - 20 FOOT...SLOPE/VALLEY..WEST 5 TO 15 MPH.
* WINDS...10000 FT MSL............SOUTHWEST 20 TO 30 MPH.
* CHANCE OF PRECIP................0 PERCENT.
* CWR (>= 0.10 IN)................0 PERCENT.
* CHANCE OF THUNDER...............1 PERCENT.
SUNDAY
* SKY/WEATHER.....................SUNNY.
* MAX TEMPERATURE.................88-103.
* 24 HR TREND..................4 DEGREES COOLER.
* MIN HUMIDITY....................16-24 PCT.
* 24 HR TREND..................LITTLE RH CHANGE.
* WINDS - 20 FOOT...SLOPE/VALLEY..SOUTHWEST 5 TO 15 MPH.
* WINDS...10000 FT MSL............SOUTHWEST 15 TO 25 MPH.
* CHANCE OF PRECIP................0 PERCENT.
* CWR (>= 0.10 IN)................0 PERCENT.
* CHANCE OF THUNDER...............0 PERCENT.
SUNDAY NIGHT
* SKY/WEATHER.....................MOSTLY CLEAR.
* MIN TEMPERATURE.................64-79.
* 24 HR TREND..................4 DEGREES COOLER.
* MAX HUMIDITY....................31-40 PCT.
* 24 HR TREND..................8 PCT DRIER.
* WINDS - 20 FOOT...SLOPE/VALLEY..WEST 5 TO 15 MPH.
* WINDS...10000 FT MSL............SOUTHWEST 15 TO 25 MPH.
* CHANCE OF PRECIP................0 PERCENT.
* CWR (>= 0.10 IN)................0 PERCENT.
* CHANCE OF THUNDER...............0 PERCENT.
MONDAY
* SKY/WEATHER.....................SUNNY.
* MAX TEMPERATURE.................85-100.
* 24 HR TREND..................3 DEGREES COOLER.
* MIN HUMIDITY....................14-20 PCT.
* 24 HR TREND..................3 PCT DRIER.
* WINDS - 20 FOOT...SLOPE/VALLEY..SOUTHWEST 5 TO 15 MPH.
* WINDS...10000 FT MSL............SOUTHWEST 15 TO 25 MPH.
* CHANCE OF PRECIP................0 PERCENT.
* CWR (>= 0.10 IN)................0 PERCENT.
* CHANCE OF THUNDER...............0 PERCENT.
EXTENDED
TUESDAY
MOSTLY CLEAR. LOWS 63-79. HIGHS 83-99. SOUTHWEST WINDS
10 TO 20 MPH.
WEDNESDAY
PARTLY CLOUDY. LOWS 64-79. HIGHS 83-98. WEST WINDS
5 TO 15 MPH.
THURSDAY
MOSTLY CLEAR. LOWS 64-79. HIGHS 85-100. SOUTHWEST
WINDS 5 TO 15 MPH.
FRIDAY
MOSTLY CLEAR. LOWS 65-81. HIGHS 86-101.
SATURDAY
MOSTLY CLEAR WITH SLIGHT CHANCE OF SHOWERS AND
THUNDERSTORMS. LOWS 66-81. HIGHS 87-100.
8 TO 10 DAY OUTLOOK
SUNDAY SEPTEMBER 6TH THROUGH TUESDAY
SEPTEMBER 8TH: ABOVE NORMAL TEMPERATURES AND ABOVE MEDIAN
PRECIPITATION.
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