801
FNUS55 KPSR 202109
FWFPSR
FIRE WEATHER PLANNING FORECAST FOR SOUTHWEST AND SOUTH-CENTRAL
ARIZONA AND SOUTHEAST CALIFORNIA
NATIONAL WEATHER SERVICE PHOENIX AZ
209 PM MST MON APR 20 2026
DISCUSSION
ABOVE NORMAL TEMPERATURES AND DRY CONDITIONS ARE EXPECTED TO
CONTINUE THROUGH THE FIRST HALF OF THIS WEEK. WINDS WILL REMAIN
MOSTLY BELOW 15 MPH TODAY, BUT ARE EXPECTED TO INCREASE ACROSS THE
REGION ON TUESDAY, ESPECIALLY ACROSS THE WESTERN DISTRICTS WHERE A
WIND ADVISORY HAS BEEN ISSUED FOR SW IMPERIAL VALLEY WHERE GUSTS
COULD REACH UP TO 55 MPH RESULTING IN ELEVATED FIRE WEATHER
CONDITIONS. ELSE WHERE OUT WEST, GUSTS BETWEEN 20-30 MPH WILL BE
COMMON. MINRHS WILL BOTTOM OUT AROUND 10-15% TODAY AND 8-12% ON
TUESDAY. OVERNIGHT RECOVERIES WILL RANGE FROM POOR TO FAIR OR
GENERALLY BETWEEN 30-50% OVER THE NEXT COUPLE NIGHTS.
NOTE...ADDITIONAL FIRE WEATHER FORECAST INFORMATION CAN BE FOUND
IN THE AREA FORECAST DISCUSSION. SEE PRODUCT PHXAFDPSR.
AZZ132-210915-
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-
209 PM MST MON APR 20 2026
TONIGHT
* SKY/WEATHER.....................PARTLY CLOUDY.
* MIN TEMPERATURE.................58-68.
* 24 HR TREND..................LITTLE CHANGE.
* MAX HUMIDITY....................24-37 PCT.
* 24 HR TREND..................LITTLE RH CHANGE.
* WINDS - 20 FOOT...SLOPE/VALLEY..SOUTHWEST 5 TO 10 MPH IN THE
EVENING BECOMING SOUTHEAST AFTER MIDNIGHT.
* WINDS...10000 FT MSL............SOUTH 10 TO 20 MPH IN THE EVENING
BECOMING 20 TO 30 MPH AFTER MIDNIGHT.
* CHANCE OF PRECIP................0 PERCENT.
* CWR (>= 0.10 IN)................0 PERCENT.
* CHANCE OF THUNDER...............0 PERCENT.
TUESDAY
* SKY/WEATHER.....................MOSTLY SUNNY.
* MAX TEMPERATURE.................87-95.
* 24 HR TREND..................LITTLE CHANGE.
* MIN HUMIDITY....................8-12 PCT.
* 24 HR TREND..................LITTLE RH CHANGE.
* WINDS - 20 FOOT...SLOPE/VALLEY..SOUTHEAST 5 TO 10 MPH IN THE
MORNING BECOMING SOUTH 5 TO 15 MPH IN THE AFTERNOON.
* WINDS...10000 FT MSL............SOUTH 20 TO 30 MPH.
* CHANCE OF PRECIP................0 PERCENT.
* CWR (>= 0.10 IN)................0 PERCENT.
* CHANCE OF THUNDER...............0 PERCENT.
* MIXING HEIGHT FOR PHOENIX.......13000 FT AGL.
* TRANSPORT WIND FOR PHOENIX......SOUTHWEST 17 KNOTS.
* DISPERSION FOR PHOENIX..........EXCELLENT.
TUESDAY NIGHT
* SKY/WEATHER.....................MOSTLY CLEAR.
* MIN TEMPERATURE.................55-65.
* 24 HR TREND..................4 DEGREES COOLER.
* MAX HUMIDITY....................33-64 PCT.
* 24 HR TREND..................18 PCT WETTER.
* WINDS - 20 FOOT...SLOPE/VALLEY..SOUTHWEST 5 TO 15 MPH.
* WINDS...10000 FT MSL............SOUTHWEST 25 TO 35 MPH.
* CHANCE OF PRECIP................0 PERCENT.
* CWR (>= 0.10 IN)................0 PERCENT.
* CHANCE OF THUNDER...............0 PERCENT.
WEDNESDAY
* SKY/WEATHER.....................MOSTLY SUNNY.
* MAX TEMPERATURE.................79-87.
* 24 HR TREND..................8 DEGREES COOLER.
* MIN HUMIDITY....................12-16 PCT.
* 24 HR TREND..................4 PCT WETTER.
* WINDS - 20 FOOT...SLOPE/VALLEY..WEST 5 TO 15 MPH.
* WINDS...10000 FT MSL............WEST 30 TO 40 MPH.
* CHANCE OF PRECIP................0 PERCENT.
* CWR (>= 0.10 IN)................0 PERCENT.
* CHANCE OF THUNDER...............0 PERCENT.
* MIXING HEIGHT FOR PHOENIX.......7700 FT AGL.
* TRANSPORT WIND FOR PHOENIX......WEST 16 KNOTS.
* DISPERSION FOR PHOENIX..........EXCELLENT.
EXTENDED
THURSDAY
MOSTLY CLEAR. LOWS 52-62. HIGHS 83-89. WEST WINDS
5 TO 15 MPH. MINIMUM RELATIVE HUMIDITY MAY BE LOWER THAN
15 PERCENT.
FRIDAY
MOSTLY CLEAR. LOWS 54-64. HIGHS 84-91. SOUTHWEST WINDS
5 TO 15 MPH. MINIMUM RELATIVE HUMIDITY MAY BE LOWER THAN
15 PERCENT.
SATURDAY
PARTLY CLOUDY. LOWS 53-63. HIGHS 80-87. SOUTHWEST
WINDS 10 TO 20 MPH.
SUNDAY
MOSTLY CLEAR. LOWS 51-61. HIGHS 77-84.
MONDAY
MOSTLY CLEAR. LOWS 51-61. HIGHS 80-86.
AZZ131-CAZ231-210915-
YUMA/MARTINEZ LAKE AND VICINITY/LOWER COLORADO RIVER VALLEY AZ-
LOWER COLORADO RIVER VALLEY CA-
209 PM MST MON APR 20 2026 /209 PM PDT MON APR 20 2026/
TONIGHT
* SKY/WEATHER.....................PARTLY CLOUDY.
* MIN TEMPERATURE.................57-62.
* 24 HR TREND..................LITTLE CHANGE.
* MAX HUMIDITY....................30-50 PCT.
* 24 HR TREND..................LITTLE RH CHANGE.
* WINDS - 20 FOOT...SLOPE/VALLEY..SOUTH 5 TO 15 MPH.
* WINDS...10000 FT MSL............SOUTH 15 TO 25 MPH.
* CHANCE OF PRECIP................0 PERCENT.
* CWR (>= 0.10 IN)................0 PERCENT.
* CHANCE OF THUNDER...............0 PERCENT.
TUESDAY
* SKY/WEATHER.....................SUNNY.
* MAX TEMPERATURE.................88-93.
* 24 HR TREND..................LITTLE CHANGE.
* MIN HUMIDITY....................9-14 PCT.
* 24 HR TREND..................LITTLE RH CHANGE.
* WINDS - 20 FOOT...SLOPE/VALLEY..SOUTH 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...............0 PERCENT.
* MIXING HEIGHT FOR YUMA..........9600 FT AGL.
* TRANSPORT WIND FOR YUMA.........SOUTHWEST 9 KNOTS.
* DISPERSION FOR YUMA.............VERY GOOD.
TUESDAY NIGHT
* SKY/WEATHER.....................MOSTLY CLEAR.
* MIN TEMPERATURE.................55-61.
* 24 HR TREND..................LITTLE CHANGE.
* MAX HUMIDITY....................58-75 PCT.
* 24 HR TREND..................27 PCT WETTER.
* WINDS - 20 FOOT...SLOPE/VALLEY..WEST 10 TO 20 MPH.
* WINDS...10000 FT MSL............SOUTHWEST 30 TO 40 MPH.
* CHANCE OF PRECIP................0 PERCENT.
* CWR (>= 0.10 IN)................0 PERCENT.
* CHANCE OF THUNDER...............0 PERCENT.
WEDNESDAY
* SKY/WEATHER.....................MOSTLY SUNNY.
* MAX TEMPERATURE.................80-85.
* 24 HR TREND..................7 DEGREES COOLER.
* MIN HUMIDITY....................13-17 PCT.
* 24 HR TREND..................3 PCT WETTER.
* WINDS - 20 FOOT...SLOPE/VALLEY..WEST 5 TO 15 MPH.
* WINDS...10000 FT MSL............WEST 30 TO 40 MPH.
* CHANCE OF PRECIP................0 PERCENT.
* CWR (>= 0.10 IN)................0 PERCENT.
* CHANCE OF THUNDER...............0 PERCENT.
* MIXING HEIGHT FOR YUMA..........6300 FT AGL.
* TRANSPORT WIND FOR YUMA.........NORTHWEST 14 KNOTS.
* DISPERSION FOR YUMA.............VERY GOOD.
EXTENDED
THURSDAY
MOSTLY CLEAR. LOWS 52-60. HIGHS 84-89. WEST WINDS
5 TO 15 MPH. MINIMUM RELATIVE HUMIDITY MAY BE LOWER THAN
15 PERCENT.
FRIDAY
MOSTLY CLEAR. LOWS 54-60. HIGHS 86-91. SOUTHWEST WINDS
5 TO 15 MPH. MINIMUM RELATIVE HUMIDITY MAY BE LOWER THAN
15 PERCENT.
SATURDAY
PARTLY CLOUDY. LOWS 54-60. HIGHS 82-87. SOUTHWEST
WINDS 10 TO 20 MPH.
SUNDAY
MOSTLY CLEAR. LOWS 53-58. HIGHS 79-84.
MONDAY
MOSTLY CLEAR. LOWS 53-59. HIGHS 82-87.
AZZ133-210915-
SOUTHERN GILA COUNTY/TONTO NATIONAL FOREST FOOTHILLS-
SOUTHERN TONTO NF/WEST SAN CARLOS BIA/SOUTH PORTION FT APACHE BIA/
CAZ-
209 PM MST MON APR 20 2026
TONIGHT
* SKY/WEATHER.....................CLEAR IN THE EVENING BECOMING
PARTLY CLOUDY AFTER MIDNIGHT.
* MIN TEMPERATURE.................48-62.
* 24 HR TREND..................LITTLE CHANGE.
* MAX HUMIDITY....................31-48 PCT.
* 24 HR TREND..................7 PCT DRIER.
* WINDS - 20 FOOT...SLOPE/VALLEY..WEST 5 TO 10 MPH IN THE EVENING
BECOMING SOUTH AFTER MIDNIGHT.
* 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.
TUESDAY
* SKY/WEATHER.....................MOSTLY SUNNY.
* MAX TEMPERATURE.................75-90.
* 24 HR TREND..................LITTLE CHANGE.
* MIN HUMIDITY....................10-16 PCT.
* 24 HR TREND..................LITTLE RH CHANGE.
* WINDS - 20 FOOT...SLOPE/VALLEY..SOUTH 5 TO 15 MPH.
* WINDS...10000 FT MSL............SOUTH 15 TO 25 MPH.
* CHANCE OF PRECIP................0 PERCENT.
* CWR (>= 0.10 IN)................0 PERCENT.
* CHANCE OF THUNDER...............0 PERCENT.
TUESDAY NIGHT
* SKY/WEATHER.....................MOSTLY CLEAR.
* MIN TEMPERATURE.................45-57.
* 24 HR TREND..................4 DEGREES COOLER.
* MAX HUMIDITY....................26-35 PCT.
* 24 HR TREND..................8 PCT DRIER.
* WINDS - 20 FOOT...SLOPE/VALLEY..SOUTHWEST 5 TO 15 MPH.
* WINDS...10000 FT MSL............SOUTHWEST 25 TO 35 MPH.
* CHANCE OF PRECIP................0 PERCENT.
* CWR (>= 0.10 IN)................0 PERCENT.
* CHANCE OF THUNDER...............0 PERCENT.
WEDNESDAY
* SKY/WEATHER.....................MOSTLY SUNNY.
* MAX TEMPERATURE.................70-84.
* 24 HR TREND..................6 DEGREES COOLER.
* MIN HUMIDITY....................12-18 PCT.
* 24 HR TREND..................LITTLE RH CHANGE.
* WINDS - 20 FOOT...SLOPE/VALLEY..SOUTH 5 TO 10 MPH IN THE MORNING
BECOMING SOUTHWEST 10 TO 20 MPH IN THE AFTERNOON.
* WINDS...10000 FT MSL............SOUTHWEST 30 TO 40 MPH.
* CHANCE OF PRECIP................0 PERCENT.
* CWR (>= 0.10 IN)................0 PERCENT.
* CHANCE OF THUNDER...............0 PERCENT.
EXTENDED
THURSDAY
MOSTLY CLEAR. LOWS 43-57. HIGHS 70-84. SOUTHWEST
WINDS 10 TO 20 MPH. MINIMUM RELATIVE HUMIDITY MAY BE LOWER THAN
15 PERCENT.
FRIDAY
MOSTLY CLEAR. LOWS 43-59. HIGHS 71-86. SOUTHWEST WINDS
10 TO 20 MPH. MINIMUM RELATIVE HUMIDITY MAY BE LOWER THAN
15 PERCENT.
SATURDAY
PARTLY CLOUDY. LOWS 44-59. HIGHS 69-83. SOUTHWEST
WINDS 10 TO 20 MPH.
SUNDAY
MOSTLY CLEAR. LOWS 40-58. HIGHS 65-79.
MONDAY
MOSTLY CLEAR. LOWS 40-56. HIGHS 67-82.
CAZ232-210915-
IMPERIAL COUNTY AND EASTERN RIVERSIDE COUNTY-
209 PM PDT MON APR 20 2026
TONIGHT
* SKY/WEATHER.....................PARTLY CLOUDY.
* MIN TEMPERATURE.................58-64.
* 24 HR TREND..................LITTLE CHANGE.
* MAX HUMIDITY....................26-48 PCT.
* 24 HR TREND..................LITTLE RH CHANGE.
* WINDS - 20 FOOT...SLOPE/VALLEY..SOUTH 5 TO 15 MPH.
* WINDS...10000 FT MSL............SOUTH 15 TO 25 MPH.
* CHANCE OF PRECIP................0 PERCENT.
* CWR (>= 0.10 IN)................0 PERCENT.
* CHANCE OF THUNDER...............0 PERCENT.
TUESDAY
* SKY/WEATHER.....................SUNNY.
* MAX TEMPERATURE.................82-92.
* 24 HR TREND..................LITTLE CHANGE.
* MIN HUMIDITY....................7-13 PCT.
* 24 HR TREND..................LITTLE RH CHANGE.
* WINDS - 20 FOOT...SLOPE/VALLEY..SOUTH 5 TO 10 MPH IN THE MORNING
BECOMING SOUTHWEST 10 TO 20 MPH IN THE AFTERNOON.
* WINDS...10000 FT MSL............SOUTHWEST 15 TO 25 MPH IN THE
MORNING BECOMING 25 TO 35 MPH IN THE AFTERNOON.
* CHANCE OF PRECIP................0 PERCENT.
* CWR (>= 0.10 IN)................0 PERCENT.
* CHANCE OF THUNDER...............0 PERCENT.
TUESDAY NIGHT
* SKY/WEATHER.....................MOSTLY CLEAR.
* MIN TEMPERATURE.................55-63.
* 24 HR TREND..................LITTLE CHANGE.
* MAX HUMIDITY....................51-69 PCT.
* 24 HR TREND..................24 PCT WETTER.
* WINDS - 20 FOOT...SLOPE/VALLEY..WEST 10 TO 20 MPH.
* WINDS...10000 FT MSL............SOUTHWEST 25 TO 35 MPH IN THE
EVENING BECOMING WEST 35 TO 45 MPH AFTER MIDNIGHT.
* CHANCE OF PRECIP................0 PERCENT.
* CWR (>= 0.10 IN)................0 PERCENT.
* CHANCE OF THUNDER...............0 PERCENT.
WEDNESDAY
* SKY/WEATHER.....................MOSTLY SUNNY.
* MAX TEMPERATURE.................75-85.
* 24 HR TREND..................7 DEGREES COOLER.
* MIN HUMIDITY....................12-18 PCT.
* 24 HR TREND..................5 PCT WETTER.
* WINDS - 20 FOOT...SLOPE/VALLEY..WEST 5 TO 15 MPH.
* WINDS...10000 FT MSL............WEST 35 TO 45 MPH IN THE MORNING
BECOMING 20 TO 30 MPH IN THE AFTERNOON.
* CHANCE OF PRECIP................0 PERCENT.
* CWR (>= 0.10 IN)................0 PERCENT.
* CHANCE OF THUNDER...............0 PERCENT.
EXTENDED
THURSDAY
MOSTLY CLEAR. LOWS 54-63. HIGHS 80-89. NORTHWEST
WINDS 5 TO 15 MPH. MINIMUM RELATIVE HUMIDITY MAY BE LOWER THAN
15 PERCENT.
FRIDAY
MOSTLY CLEAR. LOWS 57-63. HIGHS 81-90. WEST WINDS 10 TO
20 MPH. MINIMUM RELATIVE HUMIDITY MAY BE LOWER THAN 15 PERCENT.
SATURDAY
PARTLY CLOUDY. LOWS 53-63. HIGHS 76-85. WEST WINDS
15 TO 25 MPH.
SUNDAY
MOSTLY CLEAR. LOWS 53-61. HIGHS 73-82.
MONDAY
MOSTLY CLEAR. LOWS 53-62. HIGHS 77-85.
CAZ230-210915-
JOSHUA TREE NATIONAL PARK-
209 PM PDT MON APR 20 2026
TONIGHT
* SKY/WEATHER.....................MOSTLY CLEAR.
* MIN TEMPERATURE.................49-59.
* 24 HR TREND..................3 DEGREES COOLER.
* MAX HUMIDITY....................27-35 PCT.
* 24 HR TREND..................LITTLE CHANGE.
* WINDS - 20 FOOT...SLOPE/VALLEY..SOUTHWEST 5 TO 15 MPH.
* WINDS...10000 FT MSL............SOUTH 15 TO 25 MPH.
* CHANCE OF PRECIP................0 PERCENT.
* CWR (>= 0.10 IN)................0 PERCENT.
* CHANCE OF THUNDER...............0 PERCENT.
TUESDAY
* SKY/WEATHER.....................SUNNY.
* MAX TEMPERATURE.................69-86.
* 24 HR TREND..................3 DEGREES COOLER.
* MIN HUMIDITY....................9-15 PCT.
* 24 HR TREND..................3 PCT DRIER.
* WINDS - 20 FOOT...SLOPE/VALLEY..SOUTHWEST 5 TO 10 MPH IN THE
MORNING BECOMING 10 TO 20 MPH IN THE AFTERNOON.
* WINDS...10000 FT MSL............SOUTHWEST 20 TO 30 MPH IN THE
MORNING BECOMING 30 TO 40 MPH IN THE AFTERNOON.
* CHANCE OF PRECIP................0 PERCENT.
* CWR (>= 0.10 IN)................0 PERCENT.
* CHANCE OF THUNDER...............0 PERCENT.
TUESDAY NIGHT
* SKY/WEATHER.....................MOSTLY CLEAR.
* MIN TEMPERATURE.................41-54.
* 24 HR TREND..................6 DEGREES COOLER.
* MAX HUMIDITY....................53-73 PCT.
* 24 HR TREND..................31 PCT WETTER.
* WINDS - 20 FOOT...SLOPE/VALLEY..WEST 10 TO 20 MPH.
* WINDS...10000 FT MSL............SOUTHWEST 25 TO 35 MPH IN THE
EVENING BECOMING WEST 35 TO 45 MPH AFTER MIDNIGHT.
* CHANCE OF PRECIP................0 PERCENT.
* CWR (>= 0.10 IN)................0 PERCENT.
* CHANCE OF THUNDER...............0 PERCENT.
WEDNESDAY
* SKY/WEATHER.....................MOSTLY SUNNY.
* MAX TEMPERATURE.................65-79.
* 24 HR TREND..................6 DEGREES COOLER.
* MIN HUMIDITY....................12-23 PCT.
* 24 HR TREND..................5 PCT WETTER.
* WINDS - 20 FOOT...SLOPE/VALLEY..WEST 5 TO 15 MPH.
* WINDS...10000 FT MSL............WEST 30 TO 40 MPH IN THE MORNING
BECOMING NORTHWEST 20 TO 30 MPH IN THE AFTERNOON.
* CHANCE OF PRECIP................0 PERCENT.
* CWR (>= 0.10 IN)................0 PERCENT.
* CHANCE OF THUNDER...............0 PERCENT.
EXTENDED
THURSDAY
MOSTLY CLEAR. LOWS 43-59. HIGHS 69-83. NORTHWEST
WINDS 5 TO 15 MPH. MINIMUM RELATIVE HUMIDITY MAY BE LOWER THAN
15 PERCENT.
FRIDAY
MOSTLY CLEAR. LOWS 47-59. HIGHS 70-85. WEST WINDS 10 TO
20 MPH. MINIMUM RELATIVE HUMIDITY MAY BE LOWER THAN 15 PERCENT.
SATURDAY
PARTLY CLOUDY. LOWS 41-58. HIGHS 64-81. WEST WINDS
15 TO 25 MPH.
SUNDAY
MOSTLY CLEAR. LOWS 41-53. HIGHS 61-78.
MONDAY
MOSTLY CLEAR. LOWS 42-57. HIGHS 66-81.
8 TO 10 DAY OUTLOOK
TUESDAY APRIL 28TH THROUGH THURSDAY APRIL
30TH:
NEAR NORMAL TEMPERATURES AND ABOVE MEDIAN PRECIPITATION.
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