586  
FNUS55 KPSR 281039  
FWFPSR  
 
FIRE WEATHER PLANNING FORECAST FOR SOUTHWEST AND SOUTH-CENTRAL  
ARIZONA AND SOUTHEAST CALIFORNIA  
NATIONAL WEATHER SERVICE PHOENIX AZ  
339 AM MST TUE MAR 28 2017  
 
...RED FLAG WARNING IN EFFECT FROM NOON TODAY TO 7 PM MST THIS  
EVENING DUE TO STRONG WINDS, LOW RELATIVE HUMIDITY AND HIGH FIRE  
DANGER...  
   
DISCUSSION
 
 
AN AREA OF LOW PRESSURE WILL BRING BREEZY TO WINDY CONDITIONS  
ACROSS THE DESERT SOUTHWEST THROUGH THIS EVENING. THE STRONGEST  
WINDS ARE EXPECTED ACROSS THE HIGHER ELEVATIONS OF SOUTHEASTERN  
CALIFORNIA AND SOUTHWESTERN ARIZONA WITH GUSTS AS HIGH AS 50 MPH  
IN JOSHUA TREE NATIONAL PARK.  
 
MUCH DRIER AIR WILL MOVE INTO THE REGION THIS AFTERNOON BEHIND  
THE DEPARTING LOW PRESSURE SYSTEM WITH RHS DROPPING TO AROUND 10  
PERCENT ACROSS SOUTHEASTERN CALIFORNIA AND SOUTHWESTERN ARIZONA.  
FINE FUELS WILL CONTINUE TO DRY WHICH WILL RESULT IN A HIGH FIRE  
DANGER FOR A FEW HOURS THIS AFTERNOON, PARTICULARLY ALONG THE  
LOWER COLORADO RIVER VALLEY AND ACROSS PORTIONS OF LA PAZ AND YUMA  
COUNTIES. CONDITIONS WILL THEN IMPROVE TONIGHT AS RHS INCREASE  
SOMEWHAT AND WINDS SUBSIDE. A WARMING AND DRYING TREND IS THEN  
EXPECTED WEDNESDAY AS HIGH PRESSURE BUILDS ACROSS THE REGION.  
   
..THUNDERSTORMS IMPLY GUSTY WINDS
 
 
NOTE...ADDITIONAL FIRE WEATHER FORECAST INFORMATION CAN BE FOUND  
IN THE AREA FORECAST DISCUSSION. SEE PRODUCT PHXAFDPSR.  
 
AZZ132-282245-  
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-  
339 AM MST TUE MAR 28 2017  
 
...RED FLAG WARNING IN EFFECT FROM NOON TODAY TO 7 PM MST THIS  
EVENING...  
   
TODAY
 
 
* SKY/WEATHER.....................MOSTLY SUNNY. PATCHY BLOWING  
DUST.  
* MAX TEMPERATURE.................74-80.  
* 24 HR TREND..................LITTLE CHANGE.  
* MIN HUMIDITY....................10-19 PCT.  
* 24 HR TREND..................6 PCT DRIER.  
* WINDS - 20 FOOT...SLOPE/VALLEY..NORTHWEST 10 TO 20 MPH.  
* WINDS...10000 FT MSL............LIGHT AND VARIABLE.  
* CHANCE OF PRECIP................0 PERCENT.  
* LAL.............................1.  
* HAINES HIGH LEVEL INDEX.........2 OR VERY LOW POTENTIAL FOR LARGE  
PLUME DOMINATED FIRE GROWTH.  
* MIXING HEIGHT FOR PHOENIX.......8900 FT AGL.  
* TRANSPORT WIND FOR PHOENIX......NORTHWEST 11 KNOTS.  
* DISPERSION FOR PHOENIX..........VERY GOOD.  
   
TONIGHT
 
 
* SKY/WEATHER.....................MOSTLY CLEAR.  
* MIN TEMPERATURE.................49-59.  
* 24 HR TREND..................LITTLE CHANGE.  
* MAX HUMIDITY....................35-54 PCT.  
* 24 HR TREND..................4 PCT DRIER.  
* WINDS - 20 FOOT...SLOPE/VALLEY..NORTHWEST 5 TO 15 MPH.  
* WINDS...10000 FT MSL............LIGHT AND VARIABLE.  
* CHANCE OF PRECIP................0 PERCENT.  
* LAL.............................1.  
   
WEDNESDAY
 
 
* SKY/WEATHER.....................SUNNY.  
* MAX TEMPERATURE.................80-85.  
* 24 HR TREND..................6 DEGREES WARMER.  
* MIN HUMIDITY....................9-14 PCT.  
* 24 HR TREND..................4 PCT DRIER.  
* WINDS - 20 FOOT...SLOPE/VALLEY..NORTHWEST 5 TO 15 MPH.  
* WINDS...10000 FT MSL............LIGHT AND VARIABLE.  
* CHANCE OF PRECIP................0 PERCENT.  
* LAL.............................1.  
* HAINES HIGH LEVEL INDEX.........2 OR VERY LOW POTENTIAL FOR LARGE  
PLUME DOMINATED FIRE GROWTH.  
* MIXING HEIGHT FOR PHOENIX.......6800 FT AGL.  
* TRANSPORT WIND FOR PHOENIX......NORTHWEST 12 KNOTS.  
* DISPERSION FOR PHOENIX..........VERY GOOD.  
 
   
EXTENDED
 
   
THURSDAY
 
MOSTLY CLEAR. LOWS 52-62. HIGHS 83-90. SOUTHWEST  
WINDS 10 TO 20 MPH. MINIMUM RELATIVE HUMIDITY MAY BE LOWER THAN  
15 PERCENT.    
FRIDAY
 
NOT AS WARM. MOSTLY CLEAR. LOWS 49-59. HIGHS 70-76.  
WEST WINDS 10 TO 20 MPH.    
SATURDAY
 
MOSTLY CLEAR. LOWS 49-59. HIGHS 75-82. NORTHWEST  
WINDS 10 TO 20 MPH.    
SUNDAY
 
MOSTLY CLEAR. LOWS 52-62. HIGHS 80-87.    
MONDAY
 
MOSTLY CLEAR. LOWS 52-62. HIGHS 80-87.  
 

 
 
AZZ133-282245-  
SOUTHERN GILA COUNTY/TONTO NATIONAL FOREST FOOTHILLS-  
SOUTHERN TONTO NF/WEST SAN CARLOS BIA/SOUTH PORTION FT APACHE BIA/  
CAZ-  
339 AM MST TUE MAR 28 2017  
   
TODAY
 
 
* SKY/WEATHER.....................PARTLY SUNNY. SLIGHT CHANCE OF  
SHOWERS IN THE MORNING BECOMING CHANCE OF SHOWERS AND SLIGHT  
CHANCE OF THUNDERSTORMS IN THE AFTERNOON.  
* MAX TEMPERATURE.................58-75.  
* 24 HR TREND..................4 DEGREES COOLER.  
* MIN HUMIDITY....................20-36 PCT.  
* 24 HR TREND..................5 PCT WETTER.  
* WINDS - 20 FOOT...SLOPE/VALLEY..WEST 5 TO 15 MPH.  
* WINDS...10000 FT MSL............LIGHT AND VARIABLE.  
* CHANCE OF PRECIP................30 PERCENT.  
* LAL.............................1 IN THE MORNING BECOMING 2 IN  
THE AFTERNOON.  
* HAINES HIGH LEVEL INDEX.........2 OR VERY LOW POTENTIAL FOR LARGE  
PLUME DOMINATED FIRE GROWTH.  
   
TONIGHT
 
 
* SKY/WEATHER.....................MOSTLY CLEAR. SLIGHT CHANCE OF  
SHOWERS IN THE EVENING.  
* MIN TEMPERATURE.................39-50.  
* 24 HR TREND..................LITTLE CHANGE.  
* MAX HUMIDITY....................50-65 PCT.  
* 24 HR TREND..................12 PCT DRIER.  
* WINDS - 20 FOOT...SLOPE/VALLEY..NORTH 5 TO 15 MPH.  
* WINDS...10000 FT MSL............LIGHT AND VARIABLE.  
* CHANCE OF PRECIP................0 PERCENT.  
* LAL.............................1.  
   
WEDNESDAY
 
 
* SKY/WEATHER.....................MOSTLY SUNNY.  
* MAX TEMPERATURE.................67-83.  
* 24 HR TREND..................8 DEGREES WARMER.  
* MIN HUMIDITY....................11-18 PCT.  
* 24 HR TREND..................13 PCT DRIER.  
* WINDS - 20 FOOT...SLOPE/VALLEY..NORTH 5 TO 15 MPH.  
* WINDS...10000 FT MSL............LIGHT AND VARIABLE.  
* CHANCE OF PRECIP................0 PERCENT.  
* LAL.............................1.  
* HAINES HIGH LEVEL INDEX.........2 OR VERY LOW POTENTIAL FOR LARGE  
PLUME DOMINATED FIRE GROWTH.  
 
   
EXTENDED
 
   
THURSDAY
 
MOSTLY CLEAR. LOWS 41-53. HIGHS 69-83. SOUTH WINDS  
10 TO 20 MPH. MINIMUM RELATIVE HUMIDITY MAY BE LOWER THAN  
15 PERCENT.    
FRIDAY
 
COOLER. PARTLY CLOUDY WITH SLIGHT CHANCE OF SHOWERS.  
LOWS 38-53. HIGHS 56-70. SOUTHWEST WINDS 15 TO 25 MPH.    
SATURDAY
 
PARTLY CLOUDY WITH SLIGHT CHANCE OF SHOWERS. LOWS  
38-53. HIGHS 57-74. WEST WINDS 5 TO 15 MPH.    
SUNDAY
 
MOSTLY CLEAR. LOWS 39-53. HIGHS 66-79.    
MONDAY
 
MOSTLY CLEAR. LOWS 40-54. HIGHS 69-82.  
 

 
 
AZZ131-CAZ231-282245-  
YUMA/MARTINEZ LAKE AND VICINITY/LOWER COLORADO RIVER VALLEY AZ-  
LOWER COLORADO RIVER VALLEY CA-  
339 AM MST TUE MAR 28 2017 /339 AM PDT TUE MAR 28 2017/  
 
...RED FLAG WARNING IN EFFECT FROM NOON MST /NOON PDT/ TODAY TO  
7 PM MST /7 PM PDT/ THIS EVENING...  
   
TODAY
 
 
* SKY/WEATHER.....................MOSTLY SUNNY. PATCHY BLOWING DUST  
.  
* MAX TEMPERATURE.................78-82.  
* 24 HR TREND..................LITTLE CHANGE.  
* MIN HUMIDITY....................7-12 PCT.  
* 24 HR TREND..................10 PCT DRIER.  
* WINDS - 20 FOOT...SLOPE/VALLEY..NORTH 15 TO 25 MPH.  
* WINDS...10000 FT MSL............LIGHT AND VARIABLE.  
* CHANCE OF PRECIP................0 PERCENT.  
* CWR (>= 0.10 IN)................0 PERCENT.  
* LAL.............................1.  
* HAINES HIGH LEVEL INDEX.........2 OR VERY LOW POTENTIAL FOR LARGE  
PLUME DOMINATED FIRE GROWTH.  
* MIXING HEIGHT FOR YUMA..........7300 FT AGL.  
* TRANSPORT WIND FOR YUMA.........NORTHWEST 20 KNOTS.  
* DISPERSION FOR YUMA.............EXCELLENT.  
   
TONIGHT
 
 
* SKY/WEATHER.....................CLEAR.  
* MIN TEMPERATURE.................56-60.  
* 24 HR TREND..................LITTLE CHANGE.  
* MAX HUMIDITY....................32-47 PCT.  
* 24 HR TREND..................LITTLE RH CHANGE.  
* WINDS - 20 FOOT...SLOPE/VALLEY..NORTH 5 TO 15 MPH.  
* WINDS...10000 FT MSL............LIGHT AND VARIABLE.  
* CHANCE OF PRECIP................0 PERCENT.  
* CWR (>= 0.10 IN)................0 PERCENT.  
* LAL.............................1.  
   
WEDNESDAY
 
 
* SKY/WEATHER.....................MOSTLY SUNNY.  
* MAX TEMPERATURE.................84-88.  
* 24 HR TREND..................5 DEGREES WARMER.  
* MIN HUMIDITY....................7-12 PCT.  
* 24 HR TREND..................LITTLE RH CHANGE.  
* WINDS - 20 FOOT...SLOPE/VALLEY..NORTH 10 TO 20 MPH.  
* WINDS...10000 FT MSL............LIGHT AND VARIABLE.  
* CHANCE OF PRECIP................0 PERCENT.  
* CWR (>= 0.10 IN)................0 PERCENT.  
* LAL.............................1.  
* HAINES HIGH LEVEL INDEX.........2 OR VERY LOW POTENTIAL FOR LARGE  
PLUME DOMINATED FIRE GROWTH.  
* MIXING HEIGHT FOR YUMA..........5300 FT AGL.  
* TRANSPORT WIND FOR YUMA.........NORTH 8 KNOTS.  
* DISPERSION FOR YUMA.............GOOD.  
 
   
EXTENDED
 
   
THURSDAY
 
MOSTLY CLEAR. LOWS 55-61. HIGHS 89-93. SOUTHWEST  
WINDS 15 TO 25 MPH. MINIMUM RELATIVE HUMIDITY MAY BE LOWER THAN  
15 PERCENT.    
FRIDAY
 
NOT AS WARM. MOSTLY CLEAR. LOWS 54-61. HIGHS 75-79.  
NORTHWEST WINDS 15 TO 25 MPH.    
SATURDAY
 
MOSTLY CLEAR. LOWS 54-61. HIGHS 82-86. NORTHWEST  
WINDS 15 TO 25 MPH.    
SUNDAY
 
CLEAR. LOWS 56-61. HIGHS 85-89.    
MONDAY
 
MOSTLY CLEAR. LOWS 54-61. HIGHS 84-88.  
 

 
 
CAZ230-282245-  
JOSHUA TREE NATIONAL PARK-  
339 AM PDT TUE MAR 28 2017  
   
TODAY
 
 
* SKY/WEATHER.....................MOSTLY SUNNY. PATCHY BLOWING DUST  
IN THE MORNING.  
* MAX TEMPERATURE.................64-76.  
* 24 HR TREND..................LITTLE CHANGE.  
* MIN HUMIDITY....................10-15 PCT.  
* 24 HR TREND..................10 PCT DRIER.  
* WINDS - 20 FOOT...SLOPE/VALLEY..NORTH 15 TO 25 MPH.  
* WINDS...10000 FT MSL............LIGHT AND VARIABLE.  
* CHANCE OF PRECIP................0 PERCENT.  
* CWR (>= 0.10 IN)................0 PERCENT.  
* LAL.............................1.  
* HAINES HIGH LEVEL INDEX.........2 OR VERY LOW POTENTIAL FOR LARGE  
PLUME DOMINATED FIRE GROWTH.  
   
TONIGHT
 
 
* SKY/WEATHER.....................CLEAR.  
* MIN TEMPERATURE.................44-54.  
* 24 HR TREND..................LITTLE CHANGE.  
* MAX HUMIDITY....................27-40 PCT.  
* 24 HR TREND..................LITTLE RH CHANGE.  
* WINDS - 20 FOOT...SLOPE/VALLEY..NORTHWEST 10 TO 20 MPH.  
* WINDS...10000 FT MSL............LIGHT AND VARIABLE.  
* CHANCE OF PRECIP................0 PERCENT.  
* CWR (>= 0.10 IN)................0 PERCENT.  
* LAL.............................1.  
   
WEDNESDAY
 
 
* SKY/WEATHER.....................MOSTLY SUNNY.  
* MAX TEMPERATURE.................72-82.  
* 24 HR TREND..................7 DEGREES WARMER.  
* MIN HUMIDITY....................10-15 PCT.  
* 24 HR TREND..................LITTLE CHANGE.  
* WINDS - 20 FOOT...SLOPE/VALLEY..NORTH 10 TO 20 MPH.  
* WINDS...10000 FT MSL............LIGHT AND VARIABLE.  
* CHANCE OF PRECIP................0 PERCENT.  
* CWR (>= 0.10 IN)................0 PERCENT.  
* LAL.............................1.  
* HAINES HIGH LEVEL INDEX.........2 OR VERY LOW POTENTIAL FOR LARGE  
PLUME DOMINATED FIRE GROWTH.  
 
   
EXTENDED
 
   
THURSDAY
 
BREEZY. MOSTLY CLEAR. LOWS 43-58. HIGHS 74-87. WEST  
WINDS 20 TO 30 MPH.    
FRIDAY
 
COOLER, BREEZY. MOSTLY CLEAR. LOWS 43-55. HIGHS 62-74.  
NORTHWEST WINDS 20 TO 30 MPH.    
SATURDAY
 
BREEZY. MOSTLY CLEAR. LOWS 44-56. HIGHS 69-83. NORTH  
WINDS 20 TO 30 MPH.    
SUNDAY
 
MOSTLY CLEAR. LOWS 46-56. HIGHS 71-85.    
MONDAY
 
MOSTLY CLEAR. LOWS 43-56. HIGHS 68-83.  
 

 
 
CAZ232-282245-  
IMPERIAL COUNTY AND EASTERN RIVERSIDE COUNTY-  
339 AM PDT TUE MAR 28 2017  
   
TODAY
 
 
* SKY/WEATHER.....................MOSTLY SUNNY. PATCHY BLOWING DUST  
IN THE MORNING.  
* MAX TEMPERATURE.................76-84.  
* 24 HR TREND..................LITTLE CHANGE.  
* MIN HUMIDITY....................8-13 PCT.  
* 24 HR TREND..................10 PCT DRIER.  
* WINDS - 20 FOOT...SLOPE/VALLEY..NORTH 10 TO 20 MPH.  
* WINDS...10000 FT MSL............LIGHT AND VARIABLE.  
* CHANCE OF PRECIP................0 PERCENT.  
* CWR (>= 0.10 IN)................0 PERCENT.  
* LAL.............................1.  
* HAINES HIGH LEVEL INDEX.........2 OR VERY LOW POTENTIAL FOR LARGE  
PLUME DOMINATED FIRE GROWTH.  
   
TONIGHT
 
 
* SKY/WEATHER.....................CLEAR.  
* MIN TEMPERATURE.................53-59.  
* 24 HR TREND..................LITTLE CHANGE.  
* MAX HUMIDITY....................29-50 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.  
   
WEDNESDAY
 
 
* SKY/WEATHER.....................MOSTLY SUNNY.  
* MAX TEMPERATURE.................82-88.  
* 24 HR TREND..................5 DEGREES WARMER.  
* MIN HUMIDITY....................8-13 PCT.  
* 24 HR TREND..................LITTLE CHANGE.  
* WINDS - 20 FOOT...SLOPE/VALLEY..NORTH 5 TO 15 MPH.  
* WINDS...10000 FT MSL............LIGHT AND VARIABLE.  
* CHANCE OF PRECIP................0 PERCENT.  
* CWR (>= 0.10 IN)................0 PERCENT.  
* LAL.............................1.  
* HAINES HIGH LEVEL INDEX.........2 OR VERY LOW POTENTIAL FOR LARGE  
PLUME DOMINATED FIRE GROWTH.  
 
   
EXTENDED
 
   
THURSDAY
 
BREEZY. MOSTLY CLEAR. LOWS 54-62. HIGHS 85-92. WEST  
WINDS 20 TO 30 MPH. MINIMUM RELATIVE HUMIDITY MAY BE LOWER THAN  
15 PERCENT.    
FRIDAY
 
NOT AS WARM. MOSTLY CLEAR. LOWS 53-62. HIGHS 72-80.  
NORTHWEST WINDS 15 TO 25 MPH.    
SATURDAY
 
MOSTLY CLEAR. LOWS 53-61. HIGHS 80-88. NORTHWEST  
WINDS 15 TO 25 MPH.    
SUNDAY
 
CLEAR. LOWS 56-61. HIGHS 84-89.    
MONDAY
 
MOSTLY CLEAR. LOWS 53-61. HIGHS 81-87.  
 

 
   
8 TO 10 DAY OUTLOOK
 
TUESDAY APRIL 4TH THROUGH THURSDAY APRIL  
6TH: NEAR NORMAL TEMPERATURES AND NEAR MEDIAN PRECIPITATION.  
 
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