414  
FNUS55 KPSR 131022  
FWFPSR  
 
FIRE WEATHER PLANNING FORECAST FOR SOUTHWEST AND SOUTH-CENTRAL  
ARIZONA AND SOUTHEAST CALIFORNIA  
NATIONAL WEATHER SERVICE PHOENIX AZ  
322 AM MST THU AUG 13 2020  
   
DISCUSSION
 
 
CONTINUED HOT AND RELATIVELY DRY CONDITIONS ARE EXPECTED FOR THE  
REMAINDER OF THIS WEEK ALONG WITH LIGHT WINDS AND SOME AFTERNOON  
BREEZINESS. MINIMUM HUMIDITIES WILL DROP INTO THE TEENS EACH DAY.  
OVERNIGHT HUMIDITIES WILL REACH TO 25-40% FOR THE MAJORITY OF THE  
AREA. ISOLATED SHOWERS AND STORMS WILL BE POSSIBLE THIS AFTERNOON  
AND EVENING ACROSS PARTS OF THE HIGHER TERRAIN EAST OF PHOENIX AND  
POTENTIALLY EVEN ACROSS PARTS OF THE LOWER DESERTS SOUTH AND WEST  
OF PHOENIX. THE MAIN THREATS WITH ANY STORM WILL BE GUSTY WINDS,  
LIGHTNING, LOCALLY HEAVY RAINFALL, AND BLOWING DUST.  
   
..THUNDERSTORMS IMPLY GUSTY WINDS
 
 
NOTE...ADDITIONAL FIRE WEATHER FORECAST INFORMATION CAN BE FOUND  
IN THE AREA FORECAST DISCUSSION. SEE PRODUCT PHXAFDPSR.  
 
AZZ132-132230-  
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-  
322 AM MST THU AUG 13 2020  
   
TODAY
 
 
* SKY/WEATHER.....................MOSTLY SUNNY.  
* MAX TEMPERATURE.................109-114.  
* 24 HR TREND..................3 DEGREES WARMER.  
* MIN HUMIDITY....................13-18 PCT.  
* 24 HR TREND..................4 PCT DRIER.  
* WINDS - 20 FOOT...SLOPE/VALLEY..WEST 5 TO 15 MPH.  
* WINDS...10000 FT MSL............SOUTHWEST 5 TO 15 MPH IN THE  
MORNING BECOMING LIGHT AND VARIABLE IN THE AFTERNOON.  
* CHANCE OF PRECIP................10 PERCENT.  
* LAL.............................1.  
* HAINES HIGH LEVEL INDEX.........4 LOW POTENTIAL FOR LARGE PLUME  
DOMINATED FIRE GROWTH.  
* MIXING HEIGHT FOR PHOENIX.......13100 FT AGL.  
* TRANSPORT WIND FOR PHOENIX......WEST 6 KNOTS.  
* DISPERSION FOR PHOENIX..........VERY GOOD.  
   
TONIGHT
 
 
* SKY/WEATHER.....................MOSTLY CLEAR.  
* MIN TEMPERATURE.................83-93.  
* 24 HR TREND..................LITTLE CHANGE.  
* MAX HUMIDITY....................24-37 PCT.  
* 24 HR TREND..................4 PCT DRIER.  
* WINDS - 20 FOOT...SLOPE/VALLEY..NORTHWEST 5 TO 15 MPH BECOMING  
EAST.  
* WINDS...10000 FT MSL............WEST 5 TO 15 MPH.  
* CHANCE OF PRECIP................0 PERCENT.  
* LAL.............................1.  
   
FRIDAY
 
 
* SKY/WEATHER.....................MOSTLY SUNNY.  
* MAX TEMPERATURE.................109-115.  
* 24 HR TREND..................LITTLE CHANGE.  
* MIN HUMIDITY....................10-15 PCT.  
* 24 HR TREND..................LITTLE RH CHANGE.  
* WINDS - 20 FOOT...SLOPE/VALLEY..WEST 5 TO 15 MPH.  
* WINDS...10000 FT MSL............LIGHT AND VARIABLE.  
* CHANCE OF PRECIP................0 PERCENT.  
* LAL.............................1.  
* HAINES HIGH LEVEL INDEX.........5 MODERATE POTENTIAL FOR LARGE  
PLUME DOMINATED FIRE GROWTH.  
* MIXING HEIGHT FOR PHOENIX.......13700 FT AGL.  
* TRANSPORT WIND FOR PHOENIX......NORTHWEST 9 KNOTS.  
* DISPERSION FOR PHOENIX..........EXCELLENT.  
 
   
EXTENDED
 
   
SATURDAY
 
MOSTLY CLEAR. LOWS 82-92. HIGHS 108-114. SOUTHWEST  
WINDS 5 TO 15 MPH.    
SUNDAY
 
MOSTLY CLEAR. LOWS 82-92. HIGHS 110-115. SOUTHWEST  
WINDS 5 TO 15 MPH. MINIMUM RELATIVE HUMIDITY MAY BE LOWER THAN  
15 PERCENT.    
MONDAY
 
MOSTLY CLEAR. LOWS 82-92. HIGHS 110-115. SOUTH WINDS  
5 TO 15 MPH. MINIMUM RELATIVE HUMIDITY MAY BE LOWER THAN  
15 PERCENT.    
TUESDAY
 
MOSTLY CLEAR. LOWS 82-92. HIGHS 110-115.    
WEDNESDAY
 
MOSTLY CLEAR. LOWS 82-92. HIGHS 109-115.  
 

 
 
AZZ131-CAZ231-132230-  
YUMA/MARTINEZ LAKE AND VICINITY/LOWER COLORADO RIVER VALLEY AZ-  
LOWER COLORADO RIVER VALLEY CA-  
322 AM MST THU AUG 13 2020 /322 AM PDT THU AUG 13 2020/  
   
TODAY
 
 
* SKY/WEATHER.....................MOSTLY SUNNY.  
* MAX TEMPERATURE.................111-115.  
* 24 HR TREND..................3 DEGREES WARMER.  
* MIN HUMIDITY....................12-17 PCT.  
* 24 HR TREND..................6 PCT DRIER.  
* WINDS - 20 FOOT...SLOPE/VALLEY..WEST 5 TO 15 MPH.  
* 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.........3 VERY LOW POTENTIAL FOR LARGE  
PLUME DOMINATED FIRE GROWTH.  
* MIXING HEIGHT FOR YUMA..........13100 FT AGL.  
* TRANSPORT WIND FOR YUMA.........SOUTHWEST 7 KNOTS.  
* DISPERSION FOR YUMA.............VERY GOOD.  
   
TONIGHT
 
 
* SKY/WEATHER.....................MOSTLY CLEAR.  
* MIN TEMPERATURE.................84-90.  
* 24 HR TREND..................LITTLE CHANGE.  
* MAX HUMIDITY....................28-40 PCT.  
* 24 HR TREND..................LITTLE RH CHANGE.  
* WINDS - 20 FOOT...SLOPE/VALLEY..NORTHWEST 5 TO 15 MPH.  
* WINDS...10000 FT MSL............LIGHT AND VARIABLE.  
* CHANCE OF PRECIP................0 PERCENT.  
* CWR (>= 0.10 IN)................0 PERCENT.  
* LAL.............................1.  
   
FRIDAY
 
 
* SKY/WEATHER.....................MOSTLY SUNNY.  
* MAX TEMPERATURE.................113-117.  
* 24 HR TREND..................LITTLE CHANGE.  
* MIN HUMIDITY....................11-16 PCT.  
* 24 HR TREND..................LITTLE CHANGE.  
* WINDS - 20 FOOT...SLOPE/VALLEY..NORTHWEST 5 TO 10 MPH IN THE  
MORNING BECOMING SOUTHWEST IN THE AFTERNOON.  
* WINDS...10000 FT MSL............SOUTH 5 TO 15 MPH IN THE MORNING  
BECOMING LIGHT AND VARIABLE IN THE AFTERNOON.  
* 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..........12300 FT AGL.  
* TRANSPORT WIND FOR YUMA.........SOUTH 3 KNOTS.  
* DISPERSION FOR YUMA.............FAIR.  
 
   
EXTENDED
 
   
SATURDAY
 
MOSTLY CLEAR. LOWS 84-89. HIGHS 111-115. SOUTH WINDS  
5 TO 15 MPH.    
SUNDAY
 
PARTLY CLOUDY. LOWS 84-89. HIGHS 113-117. SOUTHWEST  
WINDS 10 TO 20 MPH. MINIMUM RELATIVE HUMIDITY MAY BE LOWER THAN  
15 PERCENT.    
MONDAY
 
MOSTLY CLEAR. LOWS 84-89. HIGHS 112-116. SOUTH WINDS  
5 TO 15 MPH. MINIMUM RELATIVE HUMIDITY MAY BE LOWER THAN  
15 PERCENT.    
TUESDAY
 
MOSTLY CLEAR. LOWS 84-90. HIGHS 112-116.    
WEDNESDAY
 
MOSTLY CLEAR. LOWS 84-90. HIGHS 112-116.  
 

 
 
AZZ133-132230-  
SOUTHERN GILA COUNTY/TONTO NATIONAL FOREST FOOTHILLS-  
SOUTHERN TONTO NF/WEST SAN CARLOS BIA/SOUTH PORTION FT APACHE BIA/  
CAZ-  
322 AM MST THU AUG 13 2020  
   
TODAY
 
 
* SKY/WEATHER.....................PARTLY SUNNY. SLIGHT CHANCE OF  
SHOWERS AND THUNDERSTORMS IN THE AFTERNOON.  
* MAX TEMPERATURE.................95-109.  
* 24 HR TREND..................LITTLE CHANGE.  
* MIN HUMIDITY....................12-17 PCT.  
* 24 HR TREND..................3 PCT DRIER.  
* WINDS - 20 FOOT...SLOPE/VALLEY..NORTHEAST 5 TO 10 MPH IN THE  
MORNING BECOMING WEST 5 TO 15 MPH IN THE AFTERNOON.  
* WINDS...10000 FT MSL............NORTHWEST 5 TO 15 MPH.  
* CHANCE OF PRECIP................0 PERCENT IN THE MORNING BECOMING  
10 PERCENT IN THE AFTERNOON.  
* LAL.............................1 IN THE MORNING BECOMING 2 IN  
THE AFTERNOON.  
* HAINES HIGH LEVEL INDEX.........5 MODERATE POTENTIAL FOR LARGE  
PLUME DOMINATED FIRE GROWTH.  
   
TONIGHT
 
 
* SKY/WEATHER.....................MOSTLY CLEAR.  
* MIN TEMPERATURE.................67-85.  
* 24 HR TREND..................LITTLE CHANGE.  
* MAX HUMIDITY....................27-44 PCT.  
* 24 HR TREND..................4 PCT DRIER.  
* WINDS - 20 FOOT...SLOPE/VALLEY..NORTHWEST 5 TO 10 MPH IN THE  
EVENING BECOMING NORTHEAST AFTER MIDNIGHT.  
* WINDS...10000 FT MSL............NORTHWEST 5 TO 15 MPH.  
* CHANCE OF PRECIP................10 PERCENT.  
* LAL.............................1.  
   
FRIDAY
 
 
* SKY/WEATHER.....................MOSTLY SUNNY.  
* MAX TEMPERATURE.................96-111.  
* 24 HR TREND..................LITTLE CHANGE.  
* MIN HUMIDITY....................11-16 PCT.  
* 24 HR TREND..................LITTLE RH CHANGE.  
* WINDS - 20 FOOT...SLOPE/VALLEY..NORTHEAST 5 TO 10 MPH IN THE  
MORNING BECOMING WEST 5 TO 15 MPH IN THE AFTERNOON.  
* WINDS...10000 FT MSL............NORTHWEST 5 TO 15 MPH.  
* CHANCE OF PRECIP................0 PERCENT.  
* LAL.............................1.  
* HAINES HIGH LEVEL INDEX.........5 MODERATE POTENTIAL FOR LARGE  
PLUME DOMINATED FIRE GROWTH.  
 
   
EXTENDED
 
   
SATURDAY
 
MOSTLY CLEAR. LOWS 67-84. HIGHS 97-111. NORTHWEST  
WINDS 5 TO 15 MPH.    
SUNDAY
 
PARTLY CLOUDY. LOWS 67-84. HIGHS 96-111. SOUTH WINDS  
5 TO 15 MPH.    
MONDAY
 
PARTLY CLOUDY. LOWS 66-84. HIGHS 94-110. EAST WINDS  
5 TO 15 MPH.    
TUESDAY
 
PARTLY CLOUDY. LOWS 66-84. HIGHS 94-109.    
WEDNESDAY
 
MOSTLY CLEAR. LOWS 66-84. HIGHS 94-109.  
 

 
 
CAZ232-132230-  
IMPERIAL COUNTY AND EASTERN RIVERSIDE COUNTY-  
322 AM PDT THU AUG 13 2020  
   
TODAY
 
 
* SKY/WEATHER.....................MOSTLY SUNNY.  
* MAX TEMPERATURE.................105-114.  
* 24 HR TREND..................3 DEGREES WARMER.  
* MIN HUMIDITY....................10-15 PCT.  
* 24 HR TREND..................LITTLE RH CHANGE.  
* WINDS - 20 FOOT...SLOPE/VALLEY..WEST 5 TO 15 MPH.  
* 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.................85-91.  
* 24 HR TREND..................LITTLE CHANGE.  
* MAX HUMIDITY....................21-42 PCT.  
* 24 HR TREND..................LITTLE RH CHANGE.  
* WINDS - 20 FOOT...SLOPE/VALLEY..NORTHWEST 5 TO 15 MPH.  
* WINDS...10000 FT MSL............LIGHT AND VARIABLE IN THE EVENING  
BECOMING SOUTHEAST 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.................107-116.  
* 24 HR TREND..................LITTLE CHANGE.  
* MIN HUMIDITY....................10-15 PCT.  
* 24 HR TREND..................LITTLE CHANGE.  
* WINDS - 20 FOOT...SLOPE/VALLEY..NORTHWEST 5 TO 10 MPH IN THE  
MORNING BECOMING SOUTH IN THE AFTERNOON.  
* WINDS...10000 FT MSL............SOUTH 5 TO 15 MPH IN THE MORNING  
BECOMING LIGHT AND VARIABLE IN THE AFTERNOON.  
* 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 84-91. HIGHS 107-117. SOUTHWEST  
WINDS 5 TO 15 MPH.    
SUNDAY
 
PARTLY CLOUDY. LOWS 84-91. HIGHS 107-117. SOUTHWEST  
WINDS 5 TO 15 MPH.    
MONDAY
 
MOSTLY CLEAR. LOWS 85-92. HIGHS 107-117. SOUTH WINDS  
5 TO 15 MPH.    
TUESDAY
 
MOSTLY CLEAR. LOWS 85-92. HIGHS 107-117.    
WEDNESDAY
 
MOSTLY CLEAR. LOWS 84-92. HIGHS 107-117.  
 

 
 
CAZ230-132230-  
JOSHUA TREE NATIONAL PARK-  
322 AM PDT THU AUG 13 2020  
   
TODAY
 
 
* SKY/WEATHER.....................PARTLY SUNNY.  
* MAX TEMPERATURE.................96-108.  
* 24 HR TREND..................LITTLE CHANGE.  
* MIN HUMIDITY....................11-16 PCT.  
* 24 HR TREND..................4 PCT WETTER.  
* WINDS - 20 FOOT...SLOPE/VALLEY..WEST 5 TO 15 MPH.  
* WINDS...10000 FT MSL............SOUTH 5 TO 15 MPH IN THE MORNING  
BECOMING LIGHT AND VARIABLE IN THE AFTERNOON.  
* 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.................74-85.  
* 24 HR TREND..................LITTLE CHANGE.  
* MAX HUMIDITY....................24-31 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 SOUTHEAST 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.................98-111.  
* 24 HR TREND..................LITTLE CHANGE.  
* MIN HUMIDITY....................11-16 PCT.  
* 24 HR TREND..................LITTLE CHANGE.  
* WINDS - 20 FOOT...SLOPE/VALLEY..NORTHWEST 5 TO 10 MPH IN THE  
MORNING BECOMING SOUTH IN THE AFTERNOON.  
* WINDS...10000 FT MSL............SOUTH 5 TO 15 MPH IN THE MORNING  
BECOMING LIGHT AND VARIABLE IN THE AFTERNOON.  
* CHANCE OF PRECIP................0 PERCENT.  
* CWR (>= 0.10 IN)................0 PERCENT.  
* LAL.............................1.  
* HAINES HIGH LEVEL INDEX.........5 MODERATE POTENTIAL FOR LARGE  
PLUME DOMINATED FIRE GROWTH.  
 
   
EXTENDED
 
   
SATURDAY
 
MOSTLY CLEAR. LOWS 75-87. HIGHS 98-112. WEST WINDS  
5 TO 15 MPH. MINIMUM RELATIVE HUMIDITY MAY BE LOWER THAN  
15 PERCENT.    
SUNDAY
 
PARTLY CLOUDY. LOWS 76-87. HIGHS 98-112. WEST WINDS  
5 TO 15 MPH. MINIMUM RELATIVE HUMIDITY MAY BE LOWER THAN  
15 PERCENT.    
MONDAY
 
MOSTLY CLEAR. LOWS 76-87. HIGHS 98-112. SOUTHWEST WINDS  
5 TO 15 MPH.    
TUESDAY
 
MOSTLY CLEAR. LOWS 76-87. HIGHS 98-112.    
WEDNESDAY
 
MOSTLY CLEAR. LOWS 74-86. HIGHS 99-112.  
 

 
   
8 TO 10 DAY OUTLOOK
 
THURSDAY AUGUST 20TH THROUGH SATURDAY  
AUGUST 22ND: ABOVE NORMAL TEMPERATURES AND NEAR MEDIAN PRECIPITATION.  
 
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