845  
FNUS55 KPSR 181107  
FWFPSR  
 
FIRE WEATHER PLANNING FORECAST FOR SOUTHWEST AND SOUTH-CENTRAL  
ARIZONA AND SOUTHEAST CALIFORNIA  
NATIONAL WEATHER SERVICE PHOENIX AZ  
407 AM MST SUN FEB 18 2018  
   
DISCUSSION
 
 
NEAR NORMAL TEMPERATURES TODAY AS WINDS INCREASE AHEAD OF AN  
APPROACHING WEATHER SYSTEM. STRONGEST WINDS WILL BE CONFINED TO  
SE CALIFORNIA ON SUNDAY WITH WINDY CONDITIONS AREA WIDE ON  
MONDAY. THIS SYSTEM WILL BRING A CHANCE OF PRECIPITATION TO THE  
HIGHER TERRAIN NORTH AND EAST OF PHOENIX SUNDAY NIGHT THROUGH  
EARLY TUESDAY MORNING. TEMPERATURES PLUMMET 10 TO 15 DEGREES  
BELOW AVERAGE ON MONDAY AS A COLD FRONT PUSHES THROUGH OUR AREA.  
 
NOTE...ADDITIONAL FIRE WEATHER FORECAST INFORMATION CAN BE FOUND  
IN THE AREA FORECAST DISCUSSION. SEE PRODUCT PHXAFDPSR.  
 
AZZ132-182315-  
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-  
407 AM MST SUN FEB 18 2018  
   
TODAY
 
 
* SKY/WEATHER.....................MOSTLY SUNNY.  
* MAX TEMPERATURE.................68-74.  
* 24 HR TREND..................LITTLE CHANGE.  
* MIN HUMIDITY....................23-35 PCT.  
* 24 HR TREND..................3 PCT DRIER.  
* WINDS - 20 FOOT...SLOPE/VALLEY..SOUTH 5 TO 15 MPH.  
* WINDS...10000 FT MSL............SOUTHWEST 20 TO 30 MPH.  
* CHANCE OF PRECIP................0 PERCENT.  
* LAL.............................1.  
* HAINES HIGH LEVEL INDEX.........4 OR LOW POTENTIAL FOR LARGE  
PLUME DOMINATED FIRE GROWTH.  
* MIXING HEIGHT FOR PHOENIX.......7100 FT AGL.  
* TRANSPORT WIND FOR PHOENIX......SOUTHWEST 11 KNOTS.  
* DISPERSION FOR PHOENIX..........VERY GOOD.  
   
TONIGHT
 
 
* SKY/WEATHER.....................MOSTLY CLEAR. SLIGHT CHANCE OF  
SHOWERS.  
* MIN TEMPERATURE.................46-56.  
* 24 HR TREND..................4 DEGREES WARMER.  
* MAX HUMIDITY....................49-77 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 IN THE  
EVENING BECOMING 30 TO 40 MPH AFTER MIDNIGHT.  
* CHANCE OF PRECIP................0 PERCENT.  
* LAL.............................1.  
   
MONDAY
 
 
* SKY/WEATHER.....................PARTLY SUNNY. SLIGHT CHANCE OF  
SHOWERS.  
* MAX TEMPERATURE.................55-63.  
* 24 HR TREND..................12 DEGREES COOLER.  
* MIN HUMIDITY....................18-31 PCT.  
* 24 HR TREND..................6 PCT DRIER.  
* WINDS - 20 FOOT...SLOPE/VALLEY..WEST 10 TO 20 MPH.  
* WINDS...10000 FT MSL............SOUTHWEST 45 TO 55 MPH.  
* CHANCE OF PRECIP................0 PERCENT.  
* LAL.............................1.  
* HAINES HIGH LEVEL INDEX.........5 OR MODERATE POTENTIAL FOR LARGE  
PLUME DOMINATED FIRE GROWTH.  
* MIXING HEIGHT FOR PHOENIX.......4400 FT AGL.  
* TRANSPORT WIND FOR PHOENIX......SOUTHWEST 16 KNOTS.  
* DISPERSION FOR PHOENIX..........VERY GOOD.  
 
   
EXTENDED
 
   
TUESDAY
 
MOSTLY CLEAR. LOWS 32-42. HIGHS 53-59. WEST WINDS 5 TO  
15 MPH. MINIMUM RELATIVE HUMIDITY MAY BE LOWER THAN 15 PERCENT.    
WEDNESDAY
 
MOSTLY CLEAR. LOWS 32-43. HIGHS 57-62. NORTH WINDS  
5 TO 10 MPH. MINIMUM RELATIVE HUMIDITY MAY BE LOWER THAN  
15 PERCENT.    
THURSDAY
 
PARTLY CLOUDY. LOWS 36-46. HIGHS 61-66. WEST WINDS  
5 TO 15 MPH. MINIMUM RELATIVE HUMIDITY MAY BE LOWER THAN  
15 PERCENT.    
FRIDAY
 
MOSTLY CLEAR. LOWS 38-48. HIGHS 62-67.    
SATURDAY
 
MOSTLY CLEAR. LOWS 40-50. HIGHS 65-70.  
 

 
 
AZZ133-182315-  
SOUTHERN GILA COUNTY/TONTO NATIONAL FOREST FOOTHILLS-  
SOUTHERN TONTO NF/WEST SAN CARLOS BIA/SOUTH PORTION FT APACHE BIA/  
CAZ-  
407 AM MST SUN FEB 18 2018  
   
TODAY
 
 
* SKY/WEATHER.....................PARTLY SUNNY. SLIGHT CHANCE OF  
SHOWERS IN THE AFTERNOON.  
* MAX TEMPERATURE.................55-68.  
* 24 HR TREND..................LITTLE CHANGE.  
* MIN HUMIDITY....................32-48 PCT.  
* 24 HR TREND..................LITTLE CHANGE.  
* WINDS - 20 FOOT...SLOPE/VALLEY..SOUTHWEST 5 TO 15 MPH.  
* WINDS...10000 FT MSL............SOUTHWEST 25 TO 35 MPH.  
* CHANCE OF PRECIP................0 PERCENT IN THE MORNING BECOMING  
10 PERCENT IN THE AFTERNOON.  
* LAL.............................1.  
* HAINES HIGH LEVEL INDEX.........4 OR LOW POTENTIAL FOR LARGE  
PLUME DOMINATED FIRE GROWTH.  
   
TONIGHT
 
 
* SKY/WEATHER.....................MOSTLY CLOUDY. CHANCE OF SHOWERS  
IN THE EVENING BECOMING SHOWERS LIKELY AFTER MIDNIGHT.  
* MIN TEMPERATURE.................40-51.  
* 24 HR TREND..................LITTLE CHANGE.  
* MAX HUMIDITY....................74-89 PCT.  
* 24 HR TREND..................5 PCT DRIER.  
* WINDS - 20 FOOT...SLOPE/VALLEY..SOUTHWEST 10 TO 20 MPH.  
* WINDS...10000 FT MSL............SOUTHWEST 35 TO 45 MPH.  
* CHANCE OF PRECIP................60 PERCENT.  
* LAL.............................1.  
   
MONDAY
 
 
* SKY/WEATHER.....................MOSTLY CLOUDY. CHANCE OF SHOWERS  
IN THE MORNING BECOMING SHOWERS LIKELY IN THE AFTERNOON.  
* MAX TEMPERATURE.................47-59.  
* 24 HR TREND..................9 DEGREES COOLER.  
* MIN HUMIDITY....................33-56 PCT.  
* 24 HR TREND..................5 PCT WETTER.  
* WINDS - 20 FOOT...SLOPE/VALLEY..SOUTHWEST 10 TO 20 MPH.  
* WINDS...10000 FT MSL............SOUTHWEST 45 TO 55 MPH.  
* CHANCE OF PRECIP................60 PERCENT.  
* LAL.............................1.  
* HAINES HIGH LEVEL INDEX.........2 OR VERY LOW POTENTIAL FOR LARGE  
PLUME DOMINATED FIRE GROWTH.  
 
   
EXTENDED
 
   
TUESDAY
 
COOLER. MOSTLY CLEAR WITH SLIGHT CHANCE OF SNOW  
SHOWERS. LOWS 17-38. HIGHS 40-53. WEST WINDS 5 TO 15 MPH.    
WEDNESDAY
 
MOSTLY CLEAR. LOWS 17-40. HIGHS 46-59. EAST WINDS  
5 TO 10 MPH.    
THURSDAY
 
PARTLY CLOUDY. LOWS 24-42. HIGHS 51-64. SOUTH WINDS  
5 TO 15 MPH.    
FRIDAY
 
PARTLY CLOUDY WITH SLIGHT CHANCE OF SHOWERS AND SNOW  
SHOWERS. LOWS 27-43. HIGHS 51-64.    
SATURDAY
 
MOSTLY CLEAR. LOWS 27-44. HIGHS 53-66.  
 

 
 
AZZ131-CAZ231-182315-  
YUMA/MARTINEZ LAKE AND VICINITY/LOWER COLORADO RIVER VALLEY AZ-  
LOWER COLORADO RIVER VALLEY CA-  
407 AM MST SUN FEB 18 2018 /307 AM PST SUN FEB 18 2018/  
   
TODAY
 
 
* SKY/WEATHER.....................MOSTLY SUNNY.  
* MAX TEMPERATURE.................73-77.  
* 24 HR TREND..................3 DEGREES WARMER.  
* MIN HUMIDITY....................19-29 PCT.  
* 24 HR TREND..................8 PCT WETTER.  
* 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.  
* LAL.............................1.  
* HAINES HIGH LEVEL INDEX.........4 OR LOW POTENTIAL FOR LARGE  
PLUME DOMINATED FIRE GROWTH.  
* MIXING HEIGHT FOR YUMA..........5800 FT AGL.  
* TRANSPORT WIND FOR YUMA.........SOUTHWEST 9 KNOTS.  
* DISPERSION FOR YUMA.............GOOD.  
   
TONIGHT
 
 
* SKY/WEATHER.....................CLEAR.  
* MIN TEMPERATURE.................48-54.  
* 24 HR TREND..................4 DEGREES WARMER.  
* MAX HUMIDITY....................45-62 PCT.  
* 24 HR TREND..................8 PCT WETTER.  
* WINDS - 20 FOOT...SLOPE/VALLEY..WEST 5 TO 15 MPH.  
* WINDS...10000 FT MSL............WEST 20 TO 30 MPH IN THE EVENING  
BECOMING SOUTHWEST 30 TO 40 MPH AFTER MIDNIGHT.  
* CHANCE OF PRECIP................0 PERCENT.  
* CWR (>= 0.10 IN)................0 PERCENT.  
* LAL.............................1.  
   
MONDAY
 
 
* SKY/WEATHER.....................MOSTLY SUNNY.  
* MAX TEMPERATURE.................59-63.  
* 24 HR TREND..................14 DEGREES COOLER.  
* MIN HUMIDITY....................17-22 PCT.  
* 24 HR TREND..................4 PCT DRIER.  
* WINDS - 20 FOOT...SLOPE/VALLEY..WEST 15 TO 25 MPH.  
* WINDS...10000 FT MSL............WEST 45 TO 55 MPH.  
* CHANCE OF PRECIP................0 PERCENT.  
* CWR (>= 0.10 IN)................0 PERCENT.  
* LAL.............................1.  
* HAINES HIGH LEVEL INDEX.........5 OR MODERATE POTENTIAL FOR LARGE  
PLUME DOMINATED FIRE GROWTH.  
* MIXING HEIGHT FOR YUMA..........6800 FT AGL.  
* TRANSPORT WIND FOR YUMA.........WEST 25 KNOTS.  
* DISPERSION FOR YUMA.............EXCELLENT.  
 
   
EXTENDED
 
   
TUESDAY
 
MOSTLY CLEAR. LOWS 32-43. HIGHS 57-62. NORTHWEST WINDS  
5 TO 15 MPH. MINIMUM RELATIVE HUMIDITY MAY BE LOWER THAN  
15 PERCENT.    
WEDNESDAY
 
MOSTLY CLEAR. LOWS 32-44. HIGHS 61-65. NORTH WINDS  
5 TO 10 MPH. MINIMUM RELATIVE HUMIDITY MAY BE LOWER THAN  
15 PERCENT.    
THURSDAY
 
MOSTLY CLEAR. LOWS 35-46. HIGHS 65-69. WEST WINDS  
5 TO 15 MPH. MINIMUM RELATIVE HUMIDITY MAY BE LOWER THAN  
15 PERCENT.    
FRIDAY
 
MOSTLY CLEAR. LOWS 38-49. HIGHS 66-70.    
SATURDAY
 
MOSTLY CLEAR. LOWS 41-49. HIGHS 68-73.  
 

 
 
CAZ230-182315-  
JOSHUA TREE NATIONAL PARK-  
307 AM PST SUN FEB 18 2018  
   
TODAY
 
 
* SKY/WEATHER.....................MOSTLY SUNNY.  
* MAX TEMPERATURE.................58-72.  
* 24 HR TREND..................LITTLE CHANGE.  
* MIN HUMIDITY....................19-29 PCT.  
* 24 HR TREND..................13 PCT WETTER.  
* 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............WEST 10 TO 20 MPH.  
* CHANCE OF PRECIP................0 PERCENT.  
* CWR (>= 0.10 IN)................0 PERCENT.  
* LAL.............................1.  
* HAINES HIGH LEVEL INDEX.........4 OR LOW POTENTIAL FOR LARGE  
PLUME DOMINATED FIRE GROWTH.  
   
TONIGHT
 
 
* SKY/WEATHER.....................MOSTLY CLEAR. AREAS OF BLOWING  
DUST.  
* MIN TEMPERATURE.................36-46.  
* 24 HR TREND..................LITTLE CHANGE.  
* MAX HUMIDITY....................47-67 PCT.  
* 24 HR TREND..................16 PCT WETTER.  
* WINDS - 20 FOOT...SLOPE/VALLEY..WEST 15 TO 25 MPH.  
* WINDS...10000 FT MSL............WEST 15 TO 25 MPH IN THE EVENING  
BECOMING 45 TO 55 MPH AFTER MIDNIGHT.  
* CHANCE OF PRECIP................0 PERCENT.  
* CWR (>= 0.10 IN)................0 PERCENT.  
* LAL.............................1.  
   
MONDAY
 
 
* SKY/WEATHER.....................MOSTLY SUNNY. SLIGHT CHANCE OF  
SHOWERS AND SNOW SHOWERS IN THE MORNING. AREAS OF BLOWING DUST .  
* MAX TEMPERATURE.................43-56.  
* 24 HR TREND..................15 DEGREES COOLER.  
* MIN HUMIDITY....................15-24 PCT.  
* 24 HR TREND..................4 PCT DRIER.  
* WINDS - 20 FOOT...SLOPE/VALLEY..WEST 15 TO 25 MPH.  
* WINDS...10000 FT MSL............WEST 45 TO 55 MPH IN THE MORNING  
BECOMING 25 TO 35 MPH IN THE AFTERNOON.  
* CHANCE OF PRECIP................10 PERCENT IN THE MORNING  
BECOMING 0 PERCENT IN THE AFTERNOON.  
* CWR (>= 0.10 IN)................0 PERCENT.  
* LAL.............................1.  
* HAINES HIGH LEVEL INDEX.........4 OR LOW POTENTIAL FOR LARGE  
PLUME DOMINATED FIRE GROWTH.  
 
   
EXTENDED
 
   
TUESDAY
 
MOSTLY CLEAR. LOWS 26-37. HIGHS 42-56. NORTHWEST WINDS  
10 TO 20 MPH. MINIMUM RELATIVE HUMIDITY MAY BE LOWER THAN  
15 PERCENT.    
WEDNESDAY
 
MOSTLY CLEAR. LOWS 26-37. HIGHS 46-59. NORTH WINDS  
5 TO 10 MPH. MINIMUM RELATIVE HUMIDITY MAY BE LOWER THAN  
15 PERCENT.    
THURSDAY
 
MOSTLY CLEAR. LOWS 29-40. HIGHS 52-64. WEST WINDS  
10 TO 20 MPH. MINIMUM RELATIVE HUMIDITY MAY BE LOWER THAN  
15 PERCENT.    
FRIDAY
 
MOSTLY CLEAR. LOWS 32-41. HIGHS 51-65.    
SATURDAY
 
MOSTLY CLEAR. LOWS 33-43. HIGHS 55-67.  
 

 
 
CAZ232-182315-  
IMPERIAL COUNTY AND EASTERN RIVERSIDE COUNTY-  
307 AM PST SUN FEB 18 2018  
   
TODAY
 
 
* SKY/WEATHER.....................MOSTLY SUNNY.  
* MAX TEMPERATURE.................67-77.  
* 24 HR TREND..................3 DEGREES WARMER.  
* MIN HUMIDITY....................18-33 PCT.  
* 24 HR TREND..................11 PCT WETTER.  
* 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 15 TO 25 MPH.  
* CHANCE OF PRECIP................0 PERCENT.  
* CWR (>= 0.10 IN)................0 PERCENT.  
* LAL.............................1.  
* HAINES HIGH LEVEL INDEX.........4 OR LOW POTENTIAL FOR LARGE  
PLUME DOMINATED FIRE GROWTH.  
   
TONIGHT
 
 
* SKY/WEATHER.....................MOSTLY CLEAR.  
* MIN TEMPERATURE.................46-54.  
* 24 HR TREND..................5 DEGREES WARMER.  
* MAX HUMIDITY....................42-66 PCT.  
* 24 HR TREND..................6 PCT WETTER.  
* WINDS - 20 FOOT...SLOPE/VALLEY..WEST 10 TO 20 MPH.  
* WINDS...10000 FT MSL............WEST 15 TO 25 MPH IN THE EVENING  
BECOMING 35 TO 45 MPH AFTER MIDNIGHT.  
* CHANCE OF PRECIP................0 PERCENT.  
* CWR (>= 0.10 IN)................0 PERCENT.  
* LAL.............................1.  
   
MONDAY
 
 
* SKY/WEATHER.....................MOSTLY SUNNY. AREAS OF BLOWING  
DUST.  
* MAX TEMPERATURE.................54-64.  
* 24 HR TREND..................14 DEGREES COOLER.  
* MIN HUMIDITY....................14-26 PCT.  
* 24 HR TREND..................4 PCT DRIER.  
* WINDS - 20 FOOT...SLOPE/VALLEY..WEST 15 TO 25 MPH.  
* WINDS...10000 FT MSL............WEST 55 TO 65 MPH IN THE MORNING  
BECOMING 40 TO 50 MPH IN THE AFTERNOON.  
* CHANCE OF PRECIP................0 PERCENT.  
* CWR (>= 0.10 IN)................0 PERCENT.  
* LAL.............................1.  
* HAINES HIGH LEVEL INDEX.........5 OR MODERATE POTENTIAL FOR LARGE  
PLUME DOMINATED FIRE GROWTH.  
 
   
EXTENDED
 
   
TUESDAY
 
CLEAR. LOWS 33-44. HIGHS 53-63. NORTHWEST WINDS 10 TO  
20 MPH. MINIMUM RELATIVE HUMIDITY MAY BE LOWER THAN 15 PERCENT.    
WEDNESDAY
 
MOSTLY CLEAR. LOWS 33-44. HIGHS 57-66. NORTH WINDS  
5 TO 10 MPH. MINIMUM RELATIVE HUMIDITY MAY BE LOWER THAN  
15 PERCENT.    
THURSDAY
 
MOSTLY CLEAR. LOWS 36-47. HIGHS 61-70. WEST WINDS  
5 TO 15 MPH. MINIMUM RELATIVE HUMIDITY MAY BE LOWER THAN  
15 PERCENT.    
FRIDAY
 
MOSTLY CLEAR. LOWS 38-48. HIGHS 62-71.    
SATURDAY
 
MOSTLY CLEAR. LOWS 40-50. HIGHS 64-73.  
 

 
   
8 TO 10 DAY OUTLOOK
 
SUNDAY FEBRUARY 25TH THROUGH TUESDAY  
FEBRUARY 27TH: BELOW NORMAL TEMPERATURES AND NEAR MEDIAN  
PRECIPITATION.  
 
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