565  
FNUS55 KPSR 210713  
FWFPSR  
 
FIRE WEATHER PLANNING FORECAST FOR SOUTHWEST AND SOUTH-CENTRAL  
ARIZONA AND SOUTHEAST CALIFORNIA  
NATIONAL WEATHER SERVICE PHOENIX AZ  
1213 AM MST THU OCT 21 2021  
   
DISCUSSION
 
 
WEAK HIGH PRESSURE WILL BRING CONTINUED DRY CONDITIONS AND  
SLIGHTLY ABOVE NORMAL TEMPERATURES THROUGH AT LEAST FRIDAY. WINDS  
WILL BE LIGHT AND GENERALLY FOLLOW TYPICAL DIURNAL WIND PATTERNS.  
MIN RHS WILL GENERALLY RANGE FROM 15-20% OVER THE LOWER DESERTS,  
WHILE OVERNIGHT RH RECOVERIES RANGE FROM 35-60%.  
 
NOTE...ADDITIONAL FIRE WEATHER FORECAST INFORMATION CAN BE FOUND  
IN THE AREA FORECAST DISCUSSION. SEE PRODUCT PHXAFDPSR.  
 
AZZ132-211915-  
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-  
1213 AM MST THU OCT 21 2021  
   
TODAY
 
 
* SKY/WEATHER.....................MOSTLY SUNNY.  
* MAX TEMPERATURE.................83-89.  
* 24 HR TREND..................5 DEGREES WARMER.  
* MIN HUMIDITY....................15-20 PCT.  
* 24 HR TREND..................6 PCT DRIER.  
* WINDS - 20 FOOT...SLOPE/VALLEY..NORTHEAST 5 TO 10 MPH IN THE  
MORNING BECOMING NORTHWEST IN THE AFTERNOON.  
* WINDS...10000 FT MSL............SOUTH 5 TO 15 MPH.  
* CHANCE OF PRECIP................0 PERCENT.  
* LAL.............................1.  
* HAINES HIGH LEVEL INDEX.........4 LOW POTENTIAL FOR LARGE PLUME  
DOMINATED FIRE GROWTH.  
* MIXING HEIGHT FOR PHOENIX.......4400 FT AGL.  
* TRANSPORT WIND FOR PHOENIX......NORTHWEST 3 KNOTS.  
* DISPERSION FOR PHOENIX..........MARGINAL.  
   
TONIGHT
 
 
* SKY/WEATHER.....................PARTLY CLOUDY.  
* MIN TEMPERATURE.................56-66.  
* 24 HR TREND..................LITTLE CHANGE.  
* MAX HUMIDITY....................32-47 PCT.  
* 24 HR TREND..................10 PCT DRIER.  
* WINDS - 20 FOOT...SLOPE/VALLEY..NORTHWEST 5 TO 10 MPH IN THE  
EVENING BECOMING NORTH AFTER MIDNIGHT.  
* WINDS...10000 FT MSL............LIGHT AND VARIABLE IN THE EVENING  
BECOMING SOUTH 5 TO 15 MPH AFTER MIDNIGHT.  
* CHANCE OF PRECIP................0 PERCENT.  
* LAL.............................1.  
   
FRIDAY
 
 
* SKY/WEATHER.....................MOSTLY SUNNY.  
* MAX TEMPERATURE.................84-89.  
* 24 HR TREND..................LITTLE CHANGE.  
* MIN HUMIDITY....................14-19 PCT.  
* 24 HR TREND..................LITTLE RH CHANGE.  
* 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 20 MPH.  
* CHANCE OF PRECIP................0 PERCENT.  
* LAL.............................1.  
* HAINES HIGH LEVEL INDEX.........4 LOW POTENTIAL FOR LARGE PLUME  
DOMINATED FIRE GROWTH.  
* MIXING HEIGHT FOR PHOENIX.......6800 FT AGL.  
* TRANSPORT WIND FOR PHOENIX......SOUTHWEST 5 KNOTS.  
* DISPERSION FOR PHOENIX..........FAIR.  
 
   
EXTENDED
 
   
SATURDAY
 
MOSTLY CLEAR. LOWS 55-65. HIGHS 79-86. SOUTHWEST  
WINDS 5 TO 15 MPH.    
SUNDAY
 
MOSTLY CLEAR. LOWS 55-65. HIGHS 79-86. SOUTHEAST WINDS  
5 TO 15 MPH.    
MONDAY
 
MOSTLY CLEAR. LOWS 54-64. HIGHS 80-89. SOUTH WINDS  
10 TO 20 MPH.    
TUESDAY
 
MOSTLY CLEAR. LOWS 51-61. HIGHS 73-79.    
WEDNESDAY
 
CLEAR. LOWS 51-61. HIGHS 77-82.  
 

 
 
AZZ131-CAZ231-211915-  
YUMA/MARTINEZ LAKE AND VICINITY/LOWER COLORADO RIVER VALLEY AZ-  
LOWER COLORADO RIVER VALLEY CA-  
1213 AM MST THU OCT 21 2021 /1213 AM PDT THU OCT 21 2021/  
   
TODAY
 
 
* SKY/WEATHER.....................MOSTLY SUNNY.  
* MAX TEMPERATURE.................84-89.  
* 24 HR TREND..................5 DEGREES WARMER.  
* MIN HUMIDITY....................16-21 PCT.  
* 24 HR TREND..................6 PCT DRIER.  
* WINDS - 20 FOOT...SLOPE/VALLEY..NORTH 5 TO 15 MPH.  
* WINDS...10000 FT MSL............SOUTH 5 TO 15 MPH.  
* CHANCE OF PRECIP................0 PERCENT.  
* CWR (>= 0.10 IN)................0 PERCENT.  
* LAL.............................1.  
* HAINES HIGH LEVEL INDEX.........4 LOW POTENTIAL FOR LARGE PLUME  
DOMINATED FIRE GROWTH.  
* MIXING HEIGHT FOR YUMA..........5000 FT AGL.  
* TRANSPORT WIND FOR YUMA.........NORTHWEST 5 KNOTS.  
* DISPERSION FOR YUMA.............FAIR.  
   
TONIGHT
 
 
* SKY/WEATHER.....................MOSTLY CLEAR.  
* MIN TEMPERATURE.................54-61.  
* 24 HR TREND..................LITTLE CHANGE.  
* MAX HUMIDITY....................39-53 PCT.  
* 24 HR TREND..................4 PCT DRIER.  
* WINDS - 20 FOOT...SLOPE/VALLEY..NORTH 5 TO 15 MPH.  
* WINDS...10000 FT MSL............LIGHT AND VARIABLE IN THE EVENING  
BECOMING SOUTH 5 TO 15 MPH AFTER MIDNIGHT.  
* CHANCE OF PRECIP................0 PERCENT.  
* CWR (>= 0.10 IN)................0 PERCENT.  
* LAL.............................1.  
   
FRIDAY
 
 
* SKY/WEATHER.....................MOSTLY SUNNY.  
* MAX TEMPERATURE.................86-90.  
* 24 HR TREND..................LITTLE CHANGE.  
* MIN HUMIDITY....................12-17 PCT.  
* 24 HR TREND..................4 PCT DRIER.  
* WINDS - 20 FOOT...SLOPE/VALLEY..NORTH 5 TO 10 MPH IN THE MORNING  
BECOMING SOUTHWEST IN THE AFTERNOON.  
* WINDS...10000 FT MSL............SOUTHWEST 10 TO 20 MPH.  
* CHANCE OF PRECIP................0 PERCENT.  
* CWR (>= 0.10 IN)................0 PERCENT.  
* LAL.............................1.  
* HAINES HIGH LEVEL INDEX.........4 LOW POTENTIAL FOR LARGE PLUME  
DOMINATED FIRE GROWTH.  
* MIXING HEIGHT FOR YUMA..........4700 FT AGL.  
* TRANSPORT WIND FOR YUMA.........SOUTHWEST 6 KNOTS.  
* DISPERSION FOR YUMA.............FAIR.  
 
   
EXTENDED
 
   
SATURDAY
 
MOSTLY CLEAR. LOWS 54-59. HIGHS 80-85. WEST WINDS  
5 TO 15 MPH.    
SUNDAY
 
MOSTLY CLEAR. LOWS 55-62. HIGHS 82-86. SOUTH WINDS 5 TO  
15 MPH.    
MONDAY
 
MOSTLY CLEAR. LOWS 54-62. HIGHS 82-86. SOUTH WINDS  
10 TO 20 MPH.    
TUESDAY
 
MOSTLY CLEAR. LOWS 53-60. HIGHS 76-81.    
WEDNESDAY
 
CLEAR. LOWS 53-60. HIGHS 81-85.  
 

 
 
AZZ133-211915-  
SOUTHERN GILA COUNTY/TONTO NATIONAL FOREST FOOTHILLS-  
SOUTHERN TONTO NF/WEST SAN CARLOS BIA/SOUTH PORTION FT APACHE BIA/  
CAZ-  
1213 AM MST THU OCT 21 2021  
   
TODAY
 
 
* SKY/WEATHER.....................MOSTLY SUNNY.  
* MAX TEMPERATURE.................74-87.  
* 24 HR TREND..................5 DEGREES WARMER.  
* MIN HUMIDITY....................16-21 PCT.  
* 24 HR TREND..................5 PCT DRIER.  
* WINDS - 20 FOOT...SLOPE/VALLEY..EAST 5 TO 10 MPH IN THE MORNING  
BECOMING SOUTHWEST IN THE AFTERNOON.  
* WINDS...10000 FT MSL............SOUTHWEST 5 TO 15 MPH IN THE  
MORNING BECOMING LIGHT AND VARIABLE IN THE AFTERNOON.  
* CHANCE OF PRECIP................0 PERCENT.  
* LAL.............................1.  
* HAINES HIGH LEVEL INDEX.........4 LOW POTENTIAL FOR LARGE PLUME  
DOMINATED FIRE GROWTH.  
   
TONIGHT
 
 
* SKY/WEATHER.....................PARTLY CLOUDY.  
* MIN TEMPERATURE.................46-61.  
* 24 HR TREND..................3 DEGREES WARMER.  
* MAX HUMIDITY....................33-49 PCT.  
* 24 HR TREND..................LITTLE RH CHANGE.  
* WINDS - 20 FOOT...SLOPE/VALLEY..NORTHEAST 5 TO 15 MPH.  
* WINDS...10000 FT MSL............SOUTHWEST 10 TO 20 MPH.  
* CHANCE OF PRECIP................0 PERCENT.  
* LAL.............................1.  
   
FRIDAY
 
 
* SKY/WEATHER.....................MOSTLY SUNNY.  
* MAX TEMPERATURE.................74-87.  
* 24 HR TREND..................LITTLE CHANGE.  
* MIN HUMIDITY....................17-22 PCT.  
* 24 HR TREND..................LITTLE RH CHANGE.  
* 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 20 MPH.  
* CHANCE OF PRECIP................0 PERCENT.  
* LAL.............................1.  
* HAINES HIGH LEVEL INDEX.........4 LOW POTENTIAL FOR LARGE PLUME  
DOMINATED FIRE GROWTH.  
 
   
EXTENDED
 
   
SATURDAY
 
MOSTLY CLEAR. LOWS 44-59. HIGHS 69-83. SOUTH WINDS  
5 TO 15 MPH.    
SUNDAY
 
MOSTLY CLEAR. LOWS 44-59. HIGHS 69-82. SOUTHEAST WINDS  
5 TO 15 MPH.    
MONDAY
 
MOSTLY CLEAR. LOWS 45-59. HIGHS 72-86. SOUTH WINDS  
10 TO 20 MPH.    
TUESDAY
 
COOLER. MOSTLY CLEAR WITH SLIGHT CHANCE OF SHOWERS.  
LOWS 39-58. HIGHS 62-76.    
WEDNESDAY
 
CLEAR. LOWS 39-55. HIGHS 67-79.  
 

 
 
CAZ232-211915-  
IMPERIAL COUNTY AND EASTERN RIVERSIDE COUNTY-  
1213 AM PDT THU OCT 21 2021  
   
TODAY
 
 
* SKY/WEATHER.....................MOSTLY SUNNY.  
* MAX TEMPERATURE.................80-88.  
* 24 HR TREND..................4 DEGREES WARMER.  
* MIN HUMIDITY....................16-22 PCT.  
* 24 HR TREND..................LITTLE RH CHANGE.  
* WINDS - 20 FOOT...SLOPE/VALLEY..NORTH 5 TO 15 MPH.  
* WINDS...10000 FT MSL............SOUTH 5 TO 15 MPH.  
* CHANCE OF PRECIP................0 PERCENT.  
* CWR (>= 0.10 IN)................0 PERCENT.  
* LAL.............................1.  
* HAINES HIGH LEVEL INDEX.........4 LOW POTENTIAL FOR LARGE PLUME  
DOMINATED FIRE GROWTH.  
   
TONIGHT
 
 
* SKY/WEATHER.....................MOSTLY CLEAR.  
* MIN TEMPERATURE.................56-64.  
* 24 HR TREND..................LITTLE CHANGE.  
* MAX HUMIDITY....................32-55 PCT.  
* 24 HR TREND..................LITTLE CHANGE.  
* WINDS - 20 FOOT...SLOPE/VALLEY..NORTHWEST 5 TO 15 MPH.  
* WINDS...10000 FT MSL............LIGHT AND VARIABLE IN THE EVENING  
BECOMING SOUTH 5 TO 15 MPH AFTER MIDNIGHT.  
* CHANCE OF PRECIP................0 PERCENT.  
* CWR (>= 0.10 IN)................0 PERCENT.  
* LAL.............................1.  
   
FRIDAY
 
 
* SKY/WEATHER.....................MOSTLY SUNNY.  
* MAX TEMPERATURE.................81-89.  
* 24 HR TREND..................LITTLE CHANGE.  
* MIN HUMIDITY....................12-20 PCT.  
* 24 HR TREND..................3 PCT DRIER.  
* WINDS - 20 FOOT...SLOPE/VALLEY..NORTHWEST 5 TO 10 MPH IN THE  
MORNING BECOMING SOUTHWEST IN THE AFTERNOON.  
* WINDS...10000 FT MSL............SOUTHWEST 10 TO 20 MPH.  
* CHANCE OF PRECIP................0 PERCENT.  
* CWR (>= 0.10 IN)................0 PERCENT.  
* LAL.............................1.  
* HAINES HIGH LEVEL INDEX.........4 LOW POTENTIAL FOR LARGE PLUME  
DOMINATED FIRE GROWTH.  
 
   
EXTENDED
 
   
SATURDAY
 
MOSTLY CLEAR. LOWS 55-62. HIGHS 75-84. WEST WINDS  
5 TO 15 MPH.    
SUNDAY
 
MOSTLY CLEAR. LOWS 55-63. HIGHS 76-85. SOUTHWEST WINDS  
5 TO 15 MPH.    
MONDAY
 
MOSTLY CLEAR WITH SLIGHT CHANCE OF SHOWERS. LOWS 54-63.  
HIGHS 75-85. SOUTHWEST WINDS 10 TO 20 MPH.    
TUESDAY
 
MOSTLY CLEAR. LOWS 54-61. HIGHS 71-81.    
WEDNESDAY
 
CLEAR. LOWS 54-65. HIGHS 76-85.  
 

 
 
CAZ230-211915-  
JOSHUA TREE NATIONAL PARK-  
1213 AM PDT THU OCT 21 2021  
   
TODAY
 
 
* SKY/WEATHER.....................MOSTLY SUNNY.  
* MAX TEMPERATURE.................71-82.  
* 24 HR TREND..................5 DEGREES WARMER.  
* MIN HUMIDITY....................16-21 PCT.  
* 24 HR TREND..................LITTLE RH CHANGE.  
* WINDS - 20 FOOT...SLOPE/VALLEY..NORTH 5 TO 10 MPH IN THE MORNING  
BECOMING SOUTHEAST IN THE AFTERNOON.  
* WINDS...10000 FT MSL............SOUTHWEST 10 TO 15 MPH.  
* CHANCE OF PRECIP................0 PERCENT.  
* CWR (>= 0.10 IN)................0 PERCENT.  
* LAL.............................1.  
* HAINES HIGH LEVEL INDEX.........4 LOW POTENTIAL FOR LARGE PLUME  
DOMINATED FIRE GROWTH.  
   
TONIGHT
 
 
* SKY/WEATHER.....................MOSTLY CLEAR.  
* MIN TEMPERATURE.................49-57.  
* 24 HR TREND..................3 DEGREES WARMER.  
* MAX HUMIDITY....................31-40 PCT.  
* 24 HR TREND..................3 PCT DRIER.  
* WINDS - 20 FOOT...SLOPE/VALLEY..WEST 5 TO 15 MPH.  
* WINDS...10000 FT MSL............SOUTH 10 TO 15 MPH.  
* CHANCE OF PRECIP................0 PERCENT.  
* CWR (>= 0.10 IN)................0 PERCENT.  
* LAL.............................1.  
   
FRIDAY
 
 
* SKY/WEATHER.....................MOSTLY SUNNY.  
* MAX TEMPERATURE.................71-85.  
* 24 HR TREND..................LITTLE CHANGE.  
* MIN HUMIDITY....................13-20 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.  
* LAL.............................1.  
* HAINES HIGH LEVEL INDEX.........4 LOW POTENTIAL FOR LARGE PLUME  
DOMINATED FIRE GROWTH.  
 
   
EXTENDED
 
   
SATURDAY
 
PARTLY CLOUDY. LOWS 45-56. HIGHS 65-78. WEST WINDS  
5 TO 15 MPH.    
SUNDAY
 
MOSTLY CLEAR. LOWS 47-57. HIGHS 67-80. SOUTHWEST WINDS  
5 TO 15 MPH.    
MONDAY
 
PARTLY CLOUDY WITH SLIGHT CHANCE OF SHOWERS. LOWS  
42-57. HIGHS 63-79. SOUTHWEST WINDS 10 TO 20 MPH.    
TUESDAY
 
MOSTLY CLEAR. LOWS 42-53. HIGHS 61-74.    
WEDNESDAY
 
CLEAR. LOWS 44-57. HIGHS 66-79.  
 

 
   
8 TO 10 DAY OUTLOOK
 
THURSDAY OCTOBER 28TH THROUGH SATURDAY  
OCTOBER 30TH: ABOVE NORMAL TEMPERATURES AND BELOW MEDIAN  
PRECIPITATION.  
 
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