656  
FNUS55 KPSR 201037  
FWFPSR  
 
FIRE WEATHER PLANNING FORECAST FOR SOUTHWEST AND SOUTH-CENTRAL  
ARIZONA AND SOUTHEAST CALIFORNIA  
NATIONAL WEATHER SERVICE PHOENIX AZ  
337 AM MST WED FEB 20 2019  
   
DISCUSSION
 
 
DRY WESTERLY FLOW ALOFT WILL PREVAIL TODAY, WITH GUSTY SOUTHWEST  
WIND DEVELOPING ACROSS FAR SOUTHEAST CALIFORNIA DURING THE  
AFTERNOON. A WEATHER SYSTEM DEVELOPING TO THE NORTHWEST WILL BRING  
INCREASING CHANCES OF SHOWERS OVERNIGHT TONIGHT, WITH WIDESPREAD  
SHOWERS OF RAIN AND HIGHER ELEVATION SNOW EXPECTED ON THURSDAY,  
ESPECIALLY ACROSS SOUTH-CENTRAL ARIZONA. LOOK FOR CONTINUED VERY  
COOL CONDITIONS BOTH DAYS WITH HIGH TEMPERATURES OVER 10 DEGREES  
BELOW SEASONAL NORMALS. HUMIDITY WILL STAY VERY ELEVATED BOTH  
DAYS. GUSTY SOUTHWEST WINDS WILL SPREAD EAST AND ACROSS THE  
DISTRICTS TONIGHT INTO THURSDAY.  
 
NOTE...ADDITIONAL FIRE WEATHER FORECAST INFORMATION CAN BE  
FOUND IN THE AREA FORECAST DISCUSSION. SEE PRODUCT PHXAFDPSR.  
 
AZZ132-202245-  
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-  
337 AM MST WED FEB 20 2019  
   
TODAY
 
 
* SKY/WEATHER.....................MOSTLY SUNNY.  
* MAX TEMPERATURE.................53-60.  
* 24 HR TREND..................3 DEGREES WARMER.  
* MIN HUMIDITY....................22-30 PCT.  
* 24 HR TREND..................LITTLE RH CHANGE.  
* WINDS - 20 FOOT...SLOPE/VALLEY..SOUTH 5 TO 15 MPH.  
* WINDS...10000 FT MSL............WEST 25 TO 35 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.......6000 FT AGL.  
* TRANSPORT WIND FOR PHOENIX......SOUTHWEST 12 KNOTS.  
* DISPERSION FOR PHOENIX..........VERY GOOD.  
   
TONIGHT
 
 
* SKY/WEATHER.....................PARTLY CLOUDY IN THE EVENING  
BECOMING MOSTLY CLOUDY AFTER MIDNIGHT. CHANCE OF SHOWERS.  
* MIN TEMPERATURE.................40-50.  
* 24 HR TREND..................11 DEGREES WARMER.  
* MAX HUMIDITY....................71-89 PCT.  
* 24 HR TREND..................26 PCT WETTER.  
* WINDS - 20 FOOT...SLOPE/VALLEY..SOUTH 5 TO 15 MPH.  
* WINDS...10000 FT MSL............SOUTHWEST 25 TO 35 MPH IN THE  
EVENING BECOMING 35 TO 45 MPH AFTER MIDNIGHT.  
* CHANCE OF PRECIP................40 PERCENT.  
* LAL.............................1.  
   
THURSDAY
 
 
* SKY/WEATHER.....................MOSTLY CLOUDY. RAIN IN THE  
MORNING BECOMING SHOWERS IN THE AFTERNOON.  
* MAX TEMPERATURE.................49-56.  
* 24 HR TREND..................4 DEGREES COOLER.  
* MIN HUMIDITY....................46-63 PCT.  
* 24 HR TREND..................27 PCT WETTER.  
* WINDS - 20 FOOT...SLOPE/VALLEY..SOUTHWEST 10 TO 20 MPH.  
* WINDS...10000 FT MSL............SOUTHWEST 40 TO 50 MPH.  
* CHANCE OF PRECIP................90 PERCENT.  
* LAL.............................1.  
* HAINES HIGH LEVEL INDEX.........3 OR VERY LOW POTENTIAL FOR LARGE  
PLUME DOMINATED FIRE GROWTH.  
* MIXING HEIGHT FOR PHOENIX.......7100 FT AGL.  
* TRANSPORT WIND FOR PHOENIX......SOUTHWEST 27 KNOTS.  
* DISPERSION FOR PHOENIX..........EXCELLENT.  
 
   
EXTENDED
 
   
FRIDAY
 
PARTLY CLOUDY WITH SLIGHT CHANCE OF SHOWERS. LOWS  
31-41. HIGHS 48-56. WEST WINDS 5 TO 15 MPH.    
SATURDAY
 
MOSTLY CLEAR. LOWS 31-41. HIGHS 51-59. NORTHEAST  
WINDS 5 TO 10 MPH.    
SUNDAY
 
MOSTLY CLEAR. LOWS 33-43. HIGHS 55-61. NORTH WINDS 5 TO  
10 MPH.    
MONDAY
 
MOSTLY CLEAR. LOWS 37-47. HIGHS 59-65.    
TUESDAY
 
MOSTLY CLEAR. LOWS 39-49. HIGHS 62-68.  
 

 
 
AZZ131-CAZ231-202245-  
YUMA/MARTINEZ LAKE AND VICINITY/LOWER COLORADO RIVER VALLEY AZ-  
LOWER COLORADO RIVER VALLEY CA-  
337 AM MST WED FEB 20 2019 /237 AM PST WED FEB 20 2019/  
   
TODAY
 
 
* SKY/WEATHER.....................SUNNY IN THE MORNING BECOMING  
PARTLY SUNNY IN THE AFTERNOON.  
* MAX TEMPERATURE.................59-63.  
* 24 HR TREND..................3 DEGREES WARMER.  
* MIN HUMIDITY....................23-28 PCT.  
* 24 HR TREND..................8 PCT WETTER.  
* WINDS - 20 FOOT...SLOPE/VALLEY..SOUTH 5 TO 15 MPH.  
* WINDS...10000 FT MSL............WEST 15 TO 25 MPH IN THE MORNING  
BECOMING 30 TO 40 MPH IN THE AFTERNOON.  
* 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..........5400 FT AGL.  
* TRANSPORT WIND FOR YUMA.........SOUTHWEST 18 KNOTS.  
* DISPERSION FOR YUMA.............VERY GOOD.  
   
TONIGHT
 
 
* SKY/WEATHER.....................PARTLY CLOUDY. SLIGHT CHANCE OF  
SHOWERS.  
* MIN TEMPERATURE.................42-47.  
* 24 HR TREND..................11 DEGREES WARMER.  
* MAX HUMIDITY....................71-96 PCT.  
* 24 HR TREND..................34 PCT WETTER.  
* WINDS - 20 FOOT...SLOPE/VALLEY..SOUTHWEST 5 TO 15 MPH.  
* WINDS...10000 FT MSL............SOUTHWEST 30 TO 40 MPH.  
* CHANCE OF PRECIP................20 PERCENT.  
* CWR (>= 0.10 IN)................0 PERCENT.  
* LAL.............................1.  
   
THURSDAY
 
 
* SKY/WEATHER.....................MOSTLY CLOUDY. CHANCE OF SHOWERS  
IN THE MORNING BECOMING SHOWERS LIKELY IN THE AFTERNOON.  
* MAX TEMPERATURE.................53-58.  
* 24 HR TREND..................5 DEGREES COOLER.  
* MIN HUMIDITY....................42-47 PCT.  
* 24 HR TREND..................19 PCT WETTER.  
* WINDS - 20 FOOT...SLOPE/VALLEY..SOUTHWEST 5 TO 15 MPH.  
* WINDS...10000 FT MSL............SOUTHWEST 30 TO 40 MPH.  
* CHANCE OF PRECIP................60 PERCENT.  
* CWR (>= 0.10 IN)................0 PERCENT.  
* LAL.............................1.  
* HAINES HIGH LEVEL INDEX.........3 OR VERY LOW POTENTIAL FOR LARGE  
PLUME DOMINATED FIRE GROWTH.  
* MIXING HEIGHT FOR YUMA..........3500 FT AGL.  
* TRANSPORT WIND FOR YUMA.........SOUTHWEST 20 KNOTS.  
* DISPERSION FOR YUMA.............VERY GOOD.  
 
   
EXTENDED
 
   
FRIDAY
 
MOSTLY CLEAR WITH SLIGHT CHANCE OF SHOWERS. LOWS 32-42.  
HIGHS 55-59. NORTHWEST WINDS 5 TO 15 MPH.    
SATURDAY
 
MOSTLY CLEAR. LOWS 32-42. HIGHS 57-62. NORTHEAST  
WINDS 5 TO 10 MPH.    
SUNDAY
 
MOSTLY CLEAR. LOWS 36-45. HIGHS 60-64. NORTH WINDS 5 TO  
10 MPH.    
MONDAY
 
MOSTLY CLEAR. LOWS 38-47. HIGHS 64-68.    
TUESDAY
 
MOSTLY CLEAR. LOWS 40-49. HIGHS 66-70.  
 

 
 
AZZ133-202245-  
SOUTHERN GILA COUNTY/TONTO NATIONAL FOREST FOOTHILLS-  
SOUTHERN TONTO NF/WEST SAN CARLOS BIA/SOUTH PORTION FT APACHE BIA/  
CAZ-  
337 AM MST WED FEB 20 2019  
   
TODAY
 
 
* SKY/WEATHER.....................MOSTLY SUNNY.  
* MAX TEMPERATURE.................38-51.  
* 24 HR TREND..................3 DEGREES WARMER.  
* MIN HUMIDITY....................27-40 PCT.  
* 24 HR TREND..................21 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.........3 OR VERY LOW POTENTIAL FOR LARGE  
PLUME DOMINATED FIRE GROWTH.  
   
TONIGHT
 
 
* SKY/WEATHER.....................PARTLY CLOUDY IN THE EVENING  
BECOMING CLOUDY AFTER MIDNIGHT. SLIGHT CHANCE OF SHOWERS AND SNOW  
SHOWERS IN THE EVENING BECOMING CHANCE OF SNOW SHOWERS AND  
SHOWERS LIKELY AFTER MIDNIGHT.  
* MIN TEMPERATURE.................26-38.  
* 24 HR TREND..................8 DEGREES WARMER.  
* MAX HUMIDITY....................68-85 PCT.  
* 24 HR TREND..................7 PCT WETTER.  
* WINDS - 20 FOOT...SLOPE/VALLEY..SOUTH 5 TO 15 MPH.  
* WINDS...10000 FT MSL............SOUTHWEST 35 TO 45 MPH.  
* CHANCE OF PRECIP................50 PERCENT.  
* LAL.............................1.  
   
THURSDAY
 
 
* SKY/WEATHER.....................CLOUDY. RAIN AND SNOW.  
* MAX TEMPERATURE.................35-47.  
* 24 HR TREND..................4 DEGREES COOLER.  
* MIN HUMIDITY....................59-73 PCT.  
* 24 HR TREND..................32 PCT WETTER.  
* WINDS - 20 FOOT...SLOPE/VALLEY..SOUTH 10 TO 20 MPH.  
* WINDS...10000 FT MSL............SOUTHWEST 40 TO 50 MPH.  
* CHANCE OF PRECIP................100 PERCENT.  
* LAL.............................1.  
* HAINES HIGH LEVEL INDEX.........3 OR VERY LOW POTENTIAL FOR LARGE  
PLUME DOMINATED FIRE GROWTH.  
 
   
EXTENDED
 
   
FRIDAY
 
SHOWERS AND SNOW SHOWERS. LOWS 20-38. HIGHS 33-45.  
SOUTHWEST WINDS 5 TO 15 MPH.    
SATURDAY
 
MOSTLY CLEAR WITH SLIGHT CHANCE OF SNOW SHOWERS. LOWS  
17-32. HIGHS 35-48. NORTHEAST WINDS 5 TO 15 MPH.    
SUNDAY
 
MOSTLY CLEAR. LOWS 17-37. HIGHS 42-54. NORTHEAST WINDS  
5 TO 15 MPH.    
MONDAY
 
MOSTLY CLEAR. LOWS 24-39. HIGHS 44-58.    
TUESDAY
 
MOSTLY CLEAR. LOWS 26-42. HIGHS 47-61.  
 

 
 
CAZ232-202245-  
IMPERIAL COUNTY AND EASTERN RIVERSIDE COUNTY-  
237 AM PST WED FEB 20 2019  
   
TODAY
 
 
* SKY/WEATHER.....................MOSTLY SUNNY.  
* MAX TEMPERATURE.................53-63.  
* 24 HR TREND..................LITTLE CHANGE.  
* MIN HUMIDITY....................26-40 PCT.  
* 24 HR TREND..................13 PCT WETTER.  
* 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............WEST 25 TO 35 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.....................PARTLY CLOUDY. SLIGHT CHANCE OF  
SHOWERS .  
* MIN TEMPERATURE.................39-48.  
* 24 HR TREND..................9 DEGREES WARMER.  
* MAX HUMIDITY....................68-89 PCT.  
* 24 HR TREND..................29 PCT WETTER.  
* WINDS - 20 FOOT...SLOPE/VALLEY..SOUTHWEST 10 TO 20 MPH.  
* WINDS...10000 FT MSL............WEST 25 TO 35 MPH IN THE EVENING  
BECOMING 35 TO 45 MPH AFTER MIDNIGHT.  
* CHANCE OF PRECIP................20 PERCENT.  
* CWR (>= 0.10 IN)................0 PERCENT.  
* LAL.............................1.  
   
THURSDAY
 
 
* SKY/WEATHER.....................PARTLY SUNNY. CHANCE OF SHOWERS.  
* MAX TEMPERATURE.................48-58.  
* 24 HR TREND..................5 DEGREES COOLER.  
* MIN HUMIDITY....................38-49 PCT.  
* 24 HR TREND..................11 PCT WETTER.  
* WINDS - 20 FOOT...SLOPE/VALLEY..WEST 5 TO 15 MPH.  
* WINDS...10000 FT MSL............WEST 25 TO 35 MPH.  
* CHANCE OF PRECIP................50 PERCENT.  
* CWR (>= 0.10 IN)................0 PERCENT.  
* LAL.............................1.  
* HAINES HIGH LEVEL INDEX.........3 OR VERY LOW POTENTIAL FOR LARGE  
PLUME DOMINATED FIRE GROWTH.  
 
   
EXTENDED
 
   
FRIDAY
 
MOSTLY CLEAR WITH SLIGHT CHANCE OF SHOWERS. LOWS 33-42.  
HIGHS 51-60. NORTHWEST WINDS 10 TO 20 MPH.    
SATURDAY
 
MOSTLY CLEAR. LOWS 33-44. HIGHS 54-62. NORTHEAST  
WINDS 5 TO 15 MPH.    
SUNDAY
 
MOSTLY CLEAR. LOWS 37-46. HIGHS 56-64. NORTH WINDS 5 TO  
10 MPH.    
MONDAY
 
MOSTLY CLEAR. LOWS 40-48. HIGHS 59-67.    
TUESDAY
 
MOSTLY CLEAR. LOWS 42-50. HIGHS 61-70.  
 

 
 
CAZ230-202245-  
JOSHUA TREE NATIONAL PARK-  
237 AM PST WED FEB 20 2019  
   
TODAY
 
 
* SKY/WEATHER.....................PARTLY SUNNY. SLIGHT CHANCE OF  
SNOW SHOWERS IN THE AFTERNOON.  
* MAX TEMPERATURE.................41-55.  
* 24 HR TREND..................LITTLE CHANGE.  
* MIN HUMIDITY....................37-52 PCT.  
* 24 HR TREND..................21 PCT WETTER.  
* WINDS - 20 FOOT...SLOPE/VALLEY..SOUTHWEST 10 TO 20 MPH.  
* WINDS...10000 FT MSL............WEST 25 TO 35 MPH.  
* CHANCE OF PRECIP................0 PERCENT.  
* CWR (>= 0.10 IN)................0 PERCENT.  
* LAL.............................1.  
* HAINES HIGH LEVEL INDEX.........3 OR VERY LOW POTENTIAL FOR LARGE  
PLUME DOMINATED FIRE GROWTH.  
   
TONIGHT
 
 
* SKY/WEATHER.....................PARTLY CLOUDY. SLIGHT CHANCE OF  
SHOWERS IN THE EVENING. CHANCE OF SNOW SHOWERS. CHANCE OF  
SHOWERS AFTER MIDNIGHT.  
* MIN TEMPERATURE.................29-38.  
* 24 HR TREND..................4 DEGREES WARMER.  
* MAX HUMIDITY....................82-100 PCT.  
* 24 HR TREND..................31 PCT WETTER.  
* WINDS - 20 FOOT...SLOPE/VALLEY..WEST 10 TO 20 MPH.  
* WINDS...10000 FT MSL............WEST 20 TO 30 MPH.  
* CHANCE OF PRECIP................40 PERCENT.  
* CWR (>= 0.10 IN)................0 PERCENT.  
* LAL.............................1.  
   
THURSDAY
 
 
* SKY/WEATHER.....................PARTLY SUNNY. CHANCE OF SHOWERS  
IN THE MORNING. SNOW SHOWERS LIKELY. SHOWERS LIKELY IN THE  
AFTERNOON.  
* MAX TEMPERATURE.................36-49.  
* 24 HR TREND..................5 DEGREES COOLER.  
* MIN HUMIDITY....................42-61 PCT.  
* 24 HR TREND..................7 PCT WETTER.  
* WINDS - 20 FOOT...SLOPE/VALLEY..WEST 5 TO 15 MPH.  
* WINDS...10000 FT MSL............WEST 10 TO 20 MPH.  
* CHANCE OF PRECIP................70 PERCENT.  
* CWR (>= 0.10 IN)................0 PERCENT.  
* LAL.............................1.  
* HAINES HIGH LEVEL INDEX.........3 OR VERY LOW POTENTIAL FOR LARGE  
PLUME DOMINATED FIRE GROWTH.  
 
   
EXTENDED
 
   
FRIDAY
 
MOSTLY CLEAR WITH SLIGHT CHANCE OF SNOW SHOWERS. LOWS  
27-35. HIGHS 40-52. NORTHWEST WINDS 15 TO 25 MPH.    
SATURDAY
 
MOSTLY CLEAR. LOWS 27-37. HIGHS 44-56. SOUTHWEST  
WINDS 5 TO 15 MPH.    
SUNDAY
 
PARTLY CLOUDY. LOWS 31-40. HIGHS 47-58. SOUTHWEST WINDS  
5 TO 15 MPH.    
MONDAY
 
MOSTLY CLEAR. LOWS 33-42. HIGHS 49-61.    
TUESDAY
 
MOSTLY CLEAR. LOWS 35-43. HIGHS 51-63.  
 

 
   
8 TO 10 DAY OUTLOOK
 
WEDNESDAY FEBRUARY 27TH THROUGH FRIDAY  
MARCH 1: BELOW NORMAL TEMPERATURES AND BELOW MEDIAN  
PRECIPITATION.  
 
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