590
FNUS55 KPSR 182131
FWFPSR
FIRE WEATHER PLANNING FORECAST FOR SOUTHWEST AND SOUTH-CENTRAL
ARIZONA AND SOUTHEAST CALIFORNIA
NATIONAL WEATHER SERVICE PHOENIX AZ
231 PM MST SAT APR 18 2026
DISCUSSION
WINDS WILL BE LIGHT TODAY AND MONDAY, GENERALLY BELOW 15 MPH,
WHILE A STRONG EASTERLY WIND WILL DEVELOP ACROSS SOUTH-CENTRAL AZ
TONIGHT THROUGH TOMORROW MORNING. THE STRONGEST WINDS WILL BE
OVER THE HIGHER TERRAIN OF THE EASTERN DISTRICTS, WITH WIND GUSTS
PUSHING UP TO 35-45 MPH, BUT SHORTLY AFTER SUNRISE, GUSTS UP TO
25-35 MPH ARE LIKELY TO BECOME COMMON ACROSS THE LOWER ELEVATIONS.
GIVEN THE TIME OF DAY OF STRONGEST WINDS, RH VALUES WILL BE ABOVE
CRITICAL LEVELS. STILL, SOME LOCALLY ELEVATED FIRE WEATHER
CONDITIONS MAY EXIST ACROSS SOUTH-CENTRAL AZ MIDDAY THROUGH EARLY
AFTERNOON TOMORROW. ABOVE NORMAL TEMPERATURES WILL CONTRIBUTE TO
AFTERNOON MINRHS BELOW 15% EACH DAY. OVERNIGHT RECOVERIES WILL BE
LOWEST TONIGHT AT 20-30% AND THEN IMPROVE SLIGHTLY TO 25-40% THE
NEXT COUPLE NIGHTS.
NOTE...ADDITIONAL FIRE WEATHER FORECAST INFORMATION CAN BE FOUND
IN THE AREA FORECAST DISCUSSION. SEE PRODUCT PHXAFDPSR.
AZZ132-190945-
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-
231 PM MST SAT APR 18 2026
TONIGHT
* SKY/WEATHER.....................MOSTLY CLEAR.
* MIN TEMPERATURE.................58-70.
* 24 HR TREND..................10 DEGREES WARMER.
* MAX HUMIDITY....................14-22 PCT.
* 24 HR TREND..................LITTLE CHANGE.
* WINDS - 20 FOOT...SLOPE/VALLEY..NORTHWEST 5 TO 10 MPH IN THE
EVENING BECOMING NORTHEAST AFTER MIDNIGHT.
* 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.
SUNDAY
* SKY/WEATHER.....................PARTLY SUNNY.
* MAX TEMPERATURE.................90-96.
* 24 HR TREND..................4 DEGREES WARMER.
* MIN HUMIDITY....................8-13 PCT.
* 24 HR TREND..................3 PCT WETTER.
* WINDS - 20 FOOT...SLOPE/VALLEY..EAST 5 TO 15 MPH IN THE MORNING
BECOMING SOUTH 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.
* MIXING HEIGHT FOR PHOENIX.......13800 FT AGL.
* TRANSPORT WIND FOR PHOENIX......SOUTH 9 KNOTS.
* DISPERSION FOR PHOENIX..........EXCELLENT.
SUNDAY NIGHT
* SKY/WEATHER.....................MOSTLY CLEAR.
* MIN TEMPERATURE.................59-69.
* 24 HR TREND..................LITTLE CHANGE.
* MAX HUMIDITY....................24-38 PCT.
* 24 HR TREND..................13 PCT WETTER.
* WINDS - 20 FOOT...SLOPE/VALLEY..SOUTH 5 TO 10 MPH IN THE EVENING
BECOMING SOUTHEAST AFTER MIDNIGHT.
* WINDS...10000 FT MSL............SOUTHEAST 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.................89-95.
* 24 HR TREND..................LITTLE CHANGE.
* MIN HUMIDITY....................9-13 PCT.
* 24 HR TREND..................LITTLE 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 15 TO 25 MPH.
* CHANCE OF PRECIP................0 PERCENT.
* CWR (>= 0.10 IN)................0 PERCENT.
* CHANCE OF THUNDER...............0 PERCENT.
* MIXING HEIGHT FOR PHOENIX.......11800 FT AGL.
* TRANSPORT WIND FOR PHOENIX......SOUTHWEST 5 KNOTS.
* DISPERSION FOR PHOENIX..........GOOD.
EXTENDED
TUESDAY
MOSTLY CLEAR. LOWS 55-65. HIGHS 88-95. SOUTH WINDS
10 TO 20 MPH. MINIMUM RELATIVE HUMIDITY MAY BE LOWER THAN
15 PERCENT.
WEDNESDAY
MOSTLY CLEAR. LOWS 51-62. HIGHS 79-87. WEST WINDS
10 TO 20 MPH.
THURSDAY
MOSTLY CLEAR. LOWS 51-61. HIGHS 81-87. WEST WINDS
5 TO 15 MPH. MINIMUM RELATIVE HUMIDITY MAY BE LOWER THAN
15 PERCENT.
FRIDAY
MOSTLY CLEAR. LOWS 54-64. HIGHS 82-89.
SATURDAY
MOSTLY CLEAR. LOWS 54-64. HIGHS 83-89.
AZZ131-CAZ231-190945-
YUMA/MARTINEZ LAKE AND VICINITY/LOWER COLORADO RIVER VALLEY AZ-
LOWER COLORADO RIVER VALLEY CA-
231 PM MST SAT APR 18 2026 /231 PM PDT SAT APR 18 2026/
TONIGHT
* SKY/WEATHER.....................MOSTLY CLEAR.
* MIN TEMPERATURE.................53-63.
* 24 HR TREND..................7 DEGREES WARMER.
* MAX HUMIDITY....................16-30 PCT.
* 24 HR TREND..................7 PCT WETTER.
* WINDS - 20 FOOT...SLOPE/VALLEY..WEST 5 TO 10 MPH IN THE EVENING
BECOMING NORTH AFTER MIDNIGHT.
* WINDS...10000 FT MSL............SOUTH 10 TO 20 MPH IN THE EVENING
BECOMING 25 TO 35 MPH AFTER MIDNIGHT.
* CHANCE OF PRECIP................0 PERCENT.
* CWR (>= 0.10 IN)................0 PERCENT.
* CHANCE OF THUNDER...............0 PERCENT.
SUNDAY
* SKY/WEATHER.....................PARTLY SUNNY.
* MAX TEMPERATURE.................91-96.
* 24 HR TREND..................5 DEGREES WARMER.
* MIN HUMIDITY....................8-12 PCT.
* 24 HR TREND..................LITTLE RH CHANGE.
* WINDS - 20 FOOT...SLOPE/VALLEY..NORTH 5 TO 10 MPH IN THE MORNING
BECOMING SOUTHWEST IN THE AFTERNOON.
* WINDS...10000 FT MSL............SOUTH 15 TO 25 MPH IN THE MORNING
BECOMING SOUTHEAST 5 TO 15 MPH IN THE AFTERNOON.
* CHANCE OF PRECIP................0 PERCENT.
* CWR (>= 0.10 IN)................0 PERCENT.
* CHANCE OF THUNDER...............0 PERCENT.
* MIXING HEIGHT FOR YUMA..........9900 FT AGL.
* TRANSPORT WIND FOR YUMA.........SOUTH 8 KNOTS.
* DISPERSION FOR YUMA.............GOOD.
SUNDAY NIGHT
* SKY/WEATHER.....................MOSTLY CLEAR.
* MIN TEMPERATURE.................57-63.
* 24 HR TREND..................LITTLE CHANGE.
* MAX HUMIDITY....................30-50 PCT.
* 24 HR TREND..................17 PCT WETTER.
* WINDS - 20 FOOT...SLOPE/VALLEY..SOUTHWEST 5 TO 10 MPH IN THE
EVENING BECOMING SOUTHEAST AFTER MIDNIGHT.
* WINDS...10000 FT MSL............SOUTHEAST 5 TO 15 MPH IN THE
EVENING BECOMING 15 TO 25 MPH AFTER MIDNIGHT.
* CHANCE OF PRECIP................0 PERCENT.
* CWR (>= 0.10 IN)................0 PERCENT.
* CHANCE OF THUNDER...............0 PERCENT.
MONDAY
* SKY/WEATHER.....................SUNNY.
* MAX TEMPERATURE.................91-96.
* 24 HR TREND..................LITTLE CHANGE.
* MIN HUMIDITY....................10-14 PCT.
* 24 HR TREND..................LITTLE RH CHANGE.
* WINDS - 20 FOOT...SLOPE/VALLEY..SOUTH 5 TO 15 MPH.
* 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.
* MIXING HEIGHT FOR YUMA..........7400 FT AGL.
* TRANSPORT WIND FOR YUMA.........SOUTH 15 KNOTS.
* DISPERSION FOR YUMA.............EXCELLENT.
EXTENDED
TUESDAY
MOSTLY CLEAR. LOWS 56-62. HIGHS 89-94. SOUTH WINDS
15 TO 25 MPH. MINIMUM RELATIVE HUMIDITY MAY BE LOWER THAN
15 PERCENT.
WEDNESDAY
MOSTLY CLEAR. LOWS 51-62. HIGHS 81-86. WEST WINDS
10 TO 20 MPH.
THURSDAY
MOSTLY CLEAR. LOWS 51-59. HIGHS 83-88. WEST WINDS
10 TO 20 MPH. MINIMUM RELATIVE HUMIDITY MAY BE LOWER THAN
15 PERCENT.
FRIDAY
MOSTLY CLEAR. LOWS 54-59. HIGHS 84-89.
SATURDAY
MOSTLY CLEAR. LOWS 54-60. HIGHS 85-90.
AZZ133-190945-
SOUTHERN GILA COUNTY/TONTO NATIONAL FOREST FOOTHILLS-
SOUTHERN TONTO NF/WEST SAN CARLOS BIA/SOUTH PORTION FT APACHE BIA/
CAZ-
231 PM MST SAT APR 18 2026
TONIGHT
* SKY/WEATHER.....................CLEAR.
* MIN TEMPERATURE.................52-68.
* 24 HR TREND..................13 DEGREES WARMER.
* MAX HUMIDITY....................19-30 PCT.
* 24 HR TREND..................5 PCT DRIER.
* WINDS - 20 FOOT...SLOPE/VALLEY..EAST 5 TO 10 MPH IN THE EVENING
BECOMING 10 TO 20 MPH AFTER MIDNIGHT.
* WINDS...10000 FT MSL............SOUTHEAST 15 TO 25 MPH.
* CHANCE OF PRECIP................0 PERCENT.
* CWR (>= 0.10 IN)................0 PERCENT.
* CHANCE OF THUNDER...............0 PERCENT.
SUNDAY
* SKY/WEATHER.....................PARTLY SUNNY.
* MAX TEMPERATURE.................73-90.
* 24 HR TREND..................LITTLE CHANGE.
* MIN HUMIDITY....................12-19 PCT.
* 24 HR TREND..................7 PCT WETTER.
* WINDS - 20 FOOT...SLOPE/VALLEY..SOUTHEAST 15 TO 25 MPH.
* WINDS...10000 FT MSL............SOUTH 15 TO 25 MPH.
* CHANCE OF PRECIP................0 PERCENT.
* CWR (>= 0.10 IN)................0 PERCENT.
* CHANCE OF THUNDER...............1 PERCENT.
SUNDAY NIGHT
* SKY/WEATHER.....................PARTLY CLOUDY.
* MIN TEMPERATURE.................49-65.
* 24 HR TREND..................4 DEGREES COOLER.
* MAX HUMIDITY....................39-63 PCT.
* 24 HR TREND..................27 PCT WETTER.
* WINDS - 20 FOOT...SLOPE/VALLEY..EAST 5 TO 15 MPH.
* WINDS...10000 FT MSL............SOUTH 10 TO 15 MPH.
* CHANCE OF PRECIP................0 PERCENT.
* CWR (>= 0.10 IN)................0 PERCENT.
* CHANCE OF THUNDER...............2 PERCENT.
MONDAY
* SKY/WEATHER.....................MOSTLY SUNNY.
* MAX TEMPERATURE.................75-91.
* 24 HR TREND..................LITTLE CHANGE.
* MIN HUMIDITY....................13-21 PCT.
* 24 HR TREND..................LITTLE RH CHANGE.
* WINDS - 20 FOOT...SLOPE/VALLEY..SOUTHEAST 5 TO 15 MPH IN THE
MORNING BECOMING SOUTHWEST IN THE AFTERNOON.
* WINDS...10000 FT MSL............SOUTH 10 TO 15 MPH.
* CHANCE OF PRECIP................0 PERCENT.
* CWR (>= 0.10 IN)................0 PERCENT.
* CHANCE OF THUNDER...............2 PERCENT.
EXTENDED
TUESDAY
MOSTLY CLEAR. LOWS 46-63. HIGHS 76-91. SOUTH WINDS
10 TO 20 MPH. MINIMUM RELATIVE HUMIDITY MAY BE LOWER THAN
15 PERCENT.
WEDNESDAY
MOSTLY CLEAR. LOWS 41-59. HIGHS 70-84. SOUTHWEST
WINDS 15 TO 25 MPH.
THURSDAY
MOSTLY CLEAR. LOWS 41-56. HIGHS 68-83. SOUTHWEST
WINDS 15 TO 25 MPH. MINIMUM RELATIVE HUMIDITY MAY BE LOWER THAN
15 PERCENT.
FRIDAY
MOSTLY CLEAR. LOWS 42-56. HIGHS 70-84.
SATURDAY
MOSTLY CLEAR. LOWS 42-58. HIGHS 70-84.
CAZ232-190945-
IMPERIAL COUNTY AND EASTERN RIVERSIDE COUNTY-
231 PM PDT SAT APR 18 2026
TONIGHT
* SKY/WEATHER.....................MOSTLY CLEAR.
* MIN TEMPERATURE.................57-66.
* 24 HR TREND..................6 DEGREES WARMER.
* MAX HUMIDITY....................13-42 PCT.
* 24 HR TREND..................7 PCT WETTER.
* WINDS - 20 FOOT...SLOPE/VALLEY..NORTHWEST 5 TO 15 MPH.
* WINDS...10000 FT MSL............SOUTH 5 TO 15 MPH IN THE EVENING
BECOMING 15 TO 25 MPH AFTER MIDNIGHT.
* CHANCE OF PRECIP................0 PERCENT.
* CWR (>= 0.10 IN)................0 PERCENT.
* CHANCE OF THUNDER...............0 PERCENT.
SUNDAY
* SKY/WEATHER.....................PARTLY SUNNY.
* MAX TEMPERATURE.................86-95.
* 24 HR TREND..................6 DEGREES WARMER.
* MIN HUMIDITY....................7-11 PCT.
* 24 HR TREND..................3 PCT WETTER.
* WINDS - 20 FOOT...SLOPE/VALLEY..NORTH 5 TO 10 MPH IN THE MORNING
BECOMING SOUTH IN THE AFTERNOON.
* WINDS...10000 FT MSL............SOUTH 20 TO 30 MPH IN THE MORNING
BECOMING 10 TO 20 MPH IN THE AFTERNOON.
* CHANCE OF PRECIP................0 PERCENT.
* CWR (>= 0.10 IN)................0 PERCENT.
* CHANCE OF THUNDER...............0 PERCENT.
SUNDAY NIGHT
* SKY/WEATHER.....................CLEAR.
* MIN TEMPERATURE.................59-65.
* 24 HR TREND..................LITTLE CHANGE.
* MAX HUMIDITY....................24-47 PCT.
* 24 HR TREND..................11 PCT WETTER.
* WINDS - 20 FOOT...SLOPE/VALLEY..WEST 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.
MONDAY
* SKY/WEATHER.....................SUNNY.
* MAX TEMPERATURE.................85-94.
* 24 HR TREND..................LITTLE CHANGE.
* MIN HUMIDITY....................10-15 PCT.
* 24 HR TREND..................3 PCT WETTER.
* WINDS - 20 FOOT...SLOPE/VALLEY..SOUTH 5 TO 15 MPH.
* 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.
EXTENDED
TUESDAY
BREEZY. MOSTLY CLEAR. LOWS 55-64. HIGHS 82-92.
SOUTHWEST WINDS 20 TO 30 MPH. MINIMUM RELATIVE HUMIDITY MAY BE
LOWER THAN 15 PERCENT.
WEDNESDAY
MOSTLY CLEAR. LOWS 53-63. HIGHS 75-84. WEST WINDS
15 TO 25 MPH.
THURSDAY
MOSTLY CLEAR. LOWS 53-62. HIGHS 78-87. WEST WINDS
10 TO 20 MPH. MINIMUM RELATIVE HUMIDITY MAY BE LOWER THAN
15 PERCENT.
FRIDAY
MOSTLY CLEAR. LOWS 56-62. HIGHS 79-88.
SATURDAY
MOSTLY CLEAR. LOWS 55-62. HIGHS 80-88.
CAZ230-190945-
JOSHUA TREE NATIONAL PARK-
231 PM PDT SAT APR 18 2026
TONIGHT
* SKY/WEATHER.....................PARTLY CLOUDY.
* MIN TEMPERATURE.................50-59.
* 24 HR TREND..................7 DEGREES WARMER.
* MAX HUMIDITY....................14-21 PCT.
* 24 HR TREND..................6 PCT WETTER.
* WINDS - 20 FOOT...SLOPE/VALLEY..SOUTH 5 TO 10 MPH IN THE EVENING
BECOMING WEST AFTER MIDNIGHT.
* WINDS...10000 FT MSL............LIGHT AND VARIABLE IN THE EVENING
BECOMING SOUTH 10 TO 20 MPH AFTER MIDNIGHT.
* CHANCE OF PRECIP................0 PERCENT.
* CWR (>= 0.10 IN)................0 PERCENT.
* CHANCE OF THUNDER...............0 PERCENT.
SUNDAY
* SKY/WEATHER.....................PARTLY SUNNY.
* MAX TEMPERATURE.................75-89.
* 24 HR TREND..................6 DEGREES WARMER.
* MIN HUMIDITY....................7-11 PCT.
* 24 HR TREND..................3 PCT WETTER.
* WINDS - 20 FOOT...SLOPE/VALLEY..SOUTHEAST 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.
SUNDAY NIGHT
* SKY/WEATHER.....................CLEAR.
* MIN TEMPERATURE.................51-61.
* 24 HR TREND..................LITTLE CHANGE.
* MAX HUMIDITY....................24-31 PCT.
* 24 HR TREND..................10 PCT WETTER.
* WINDS - 20 FOOT...SLOPE/VALLEY..WEST 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.
MONDAY
* SKY/WEATHER.....................SUNNY.
* MAX TEMPERATURE.................75-89.
* 24 HR TREND..................LITTLE CHANGE.
* MIN HUMIDITY....................10-15 PCT.
* 24 HR TREND..................3 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............SOUTH 10 TO 20 MPH.
* CHANCE OF PRECIP................0 PERCENT.
* CWR (>= 0.10 IN)................0 PERCENT.
* CHANCE OF THUNDER...............0 PERCENT.
EXTENDED
TUESDAY
BREEZY. MOSTLY CLEAR. LOWS 42-59. HIGHS 70-86.
SOUTHWEST WINDS 20 TO 30 MPH. MINIMUM RELATIVE HUMIDITY MAY BE
LOWER THAN 15 PERCENT.
WEDNESDAY
MOSTLY CLEAR. LOWS 41-55. HIGHS 64-79. WEST WINDS
15 TO 25 MPH.
THURSDAY
MOSTLY CLEAR. LOWS 41-57. HIGHS 68-82. WEST WINDS
10 TO 20 MPH. MINIMUM RELATIVE HUMIDITY MAY BE LOWER THAN
15 PERCENT.
FRIDAY
MOSTLY CLEAR. LOWS 45-57. HIGHS 68-83.
SATURDAY
MOSTLY CLEAR. LOWS 45-56. HIGHS 68-83.
8 TO 10 DAY OUTLOOK
SUNDAY APRIL 26TH THROUGH MONDAY APRIL
28TH: NEAR NORMAL TEMPERATURES AND NEAR MEDIAN PRECIPITATION.
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