603  
FNUS55 KPSR 181527 AAA  
FWFPSR  
 
FIRE WEATHER PLANNING FORECAST FOR SOUTHWEST AND SOUTH-CENTRAL...UPDATED  
ARIZONA AND SOUTHEAST CALIFORNIA  
NATIONAL WEATHER SERVICE PHOENIX AZ  
827 AM MST THU OCT 18 2018  
   
DISCUSSION
 
 
A LARGE UPPER LOW OVER THE GREAT BASIN WILL CONTINUE TO SHIFT  
NORTH, LEAVING BEHIND DRY CONDITIONS AND A WARMING TREND THROUGH  
SATURDAY. MINIMUM RH VALUES STAY ELEVATED THROUGH FRIDAY, MOSTLY  
RUNNING BETWEEN 20 AND 30 PERCENT OVER THE LOWER DESERTS. AFTER  
LIGHTER WINDS TODAY, BREEZY NORTHEAST TO EASTERLY WINDS WILL  
OVERTAKE THE AREA ON FRIDAY WITH GUSTS TO AROUND 20 MPH.  
   
..THUNDERSTORMS IMPLY GUSTY WINDS
 
 
NOTE...ADDITIONAL FIRE WEATHER FORECAST INFORMATION CAN BE FOUND  
IN THE AREA FORECAST DISCUSSION. SEE PRODUCT PHXAFDPSR.  
 
AZZ132-190330-  
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-  
827 AM MST THU OCT 18 2018  
   
TODAY
 
 
* SKY/WEATHER.....................SUNNY.  
* MAX TEMPERATURE.................76-81.  
* 24 HR TREND..................4 DEGREES WARMER.  
* MIN HUMIDITY....................24-33 PCT.  
* 24 HR TREND..................4 PCT DRIER.  
* WINDS - 20 FOOT...SLOPE/VALLEY..NORTHEAST 5 TO 15 MPH.  
* WINDS...10000 FT MSL............NORTH 5 TO 15 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.......0 FT AGL.  
* TRANSPORT WIND FOR PHOENIX......NORTHEAST 3 KNOTS.  
* DISPERSION FOR PHOENIX..........POOR.  
   
TONIGHT
 
 
* SKY/WEATHER.....................CLEAR.  
* MIN TEMPERATURE.................58-68.  
* 24 HR TREND..................4 DEGREES WARMER.  
* MAX HUMIDITY....................50-67 PCT.  
* 24 HR TREND..................9 PCT DRIER.  
* WINDS - 20 FOOT...SLOPE/VALLEY..NORTHEAST 5 TO 15 MPH.  
* WINDS...10000 FT MSL............EAST 10 TO 15 MPH.  
* CHANCE OF PRECIP................0 PERCENT.  
* LAL.............................1.  
   
FRIDAY
 
 
* SKY/WEATHER.....................SUNNY.  
* MAX TEMPERATURE.................81-86.  
* 24 HR TREND..................5 DEGREES WARMER.  
* MIN HUMIDITY....................21-32 PCT.  
* 24 HR TREND..................LITTLE RH CHANGE.  
* WINDS - 20 FOOT...SLOPE/VALLEY..NORTHEAST 5 TO 15 MPH.  
* WINDS...10000 FT MSL............EAST 10 TO 15 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......EAST 10 KNOTS.  
* DISPERSION FOR PHOENIX..........GOOD.  
 
   
EXTENDED
 
   
SATURDAY
 
MOSTLY CLEAR WITH SLIGHT CHANCE OF SHOWERS AND  
THUNDERSTORMS. LOWS 62-72. HIGHS 83-89. EAST WINDS 10 TO 20 MPH.    
SUNDAY
 
PARTLY CLOUDY WITH SLIGHT CHANCE OF SHOWERS AND  
THUNDERSTORMS. LOWS 61-71. HIGHS 81-87. EAST WINDS 10 TO 20 MPH.    
MONDAY
 
PARTLY CLOUDY WITH SLIGHT CHANCE OF SHOWERS. LOWS  
60-70. HIGHS 79-85. EAST WINDS 5 TO 10 MPH.    
TUESDAY
 
MOSTLY CLEAR. LOWS 60-70. HIGHS 79-85.    
WEDNESDAY
 
MOSTLY CLEAR. LOWS 59-69. HIGHS 79-85.  
 

 
 
AZZ131-CAZ231-190330-  
YUMA/MARTINEZ LAKE AND VICINITY/LOWER COLORADO RIVER VALLEY AZ-  
LOWER COLORADO RIVER VALLEY CA-  
827 AM MST THU OCT 18 2018 /827 AM PDT THU OCT 18 2018/  
   
TODAY
 
 
* SKY/WEATHER.....................SUNNY.  
* MAX TEMPERATURE.................81-85.  
* 24 HR TREND..................5 DEGREES WARMER.  
* MIN HUMIDITY....................21-26 PCT.  
* 24 HR TREND..................4 PCT DRIER.  
* WINDS - 20 FOOT...SLOPE/VALLEY..NORTH 5 TO 15 MPH.  
* WINDS...10000 FT MSL............NORTH 10 TO 15 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..........0 FT AGL.  
* TRANSPORT WIND FOR YUMA.........NORTH 8 KNOTS.  
* DISPERSION FOR YUMA.............POOR.  
   
TONIGHT
 
 
* SKY/WEATHER.....................CLEAR.  
* MIN TEMPERATURE.................59-64.  
* 24 HR TREND..................3 DEGREES WARMER.  
* MAX HUMIDITY....................41-54 PCT.  
* 24 HR TREND..................11 PCT DRIER.  
* WINDS - 20 FOOT...SLOPE/VALLEY..NORTH 5 TO 15 MPH.  
* WINDS...10000 FT MSL............NORTHEAST 10 TO 20 MPH.  
* CHANCE OF PRECIP................0 PERCENT.  
* CWR (>= 0.10 IN)................0 PERCENT.  
* LAL.............................1.  
   
FRIDAY
 
 
* SKY/WEATHER.....................SUNNY.  
* MAX TEMPERATURE.................85-89.  
* 24 HR TREND..................3 DEGREES WARMER.  
* MIN HUMIDITY....................19-24 PCT.  
* 24 HR TREND..................LITTLE RH CHANGE.  
* WINDS - 20 FOOT...SLOPE/VALLEY..NORTH 5 TO 15 MPH.  
* WINDS...10000 FT MSL............EAST 10 TO 15 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..........6900 FT AGL.  
* TRANSPORT WIND FOR YUMA.........NORTHEAST 10 KNOTS.  
* DISPERSION FOR YUMA.............GOOD.  
 
   
EXTENDED
 
   
SATURDAY
 
MOSTLY CLEAR. LOWS 63-68. HIGHS 87-91. NORTH WINDS  
5 TO 15 MPH.    
SUNDAY
 
MOSTLY CLEAR WITH SLIGHT CHANCE OF SHOWERS AND  
THUNDERSTORMS. LOWS 64-68. HIGHS 85-89. EAST WINDS 5 TO 15 MPH.    
MONDAY
 
MOSTLY CLEAR. LOWS 63-67. HIGHS 84-88. NORTH WINDS 5 TO  
10 MPH.    
TUESDAY
 
MOSTLY CLEAR. LOWS 62-67. HIGHS 84-88.    
WEDNESDAY
 
MOSTLY CLEAR. LOWS 62-67. HIGHS 85-89.  
 

 
 
AZZ133-190330-  
SOUTHERN GILA COUNTY/TONTO NATIONAL FOREST FOOTHILLS-  
SOUTHERN TONTO NF/WEST SAN CARLOS BIA/SOUTH PORTION FT APACHE BIA/  
CAZ-  
827 AM MST THU OCT 18 2018  
   
TODAY
 
 
* SKY/WEATHER.....................MOSTLY SUNNY.  
* MAX TEMPERATURE.................62-77.  
* 24 HR TREND..................6 DEGREES WARMER.  
* MIN HUMIDITY....................32-53 PCT.  
* 24 HR TREND..................LITTLE RH CHANGE.  
* WINDS - 20 FOOT...SLOPE/VALLEY..EAST 5 TO 15 MPH.  
* WINDS...10000 FT MSL............SOUTH 10 TO 20 MPH.  
* CHANCE OF PRECIP................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.................44-57.  
* 24 HR TREND..................4 DEGREES WARMER.  
* MAX HUMIDITY....................59-86 PCT.  
* 24 HR TREND..................10 PCT DRIER.  
* WINDS - 20 FOOT...SLOPE/VALLEY..EAST 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.  
* LAL.............................1.  
   
FRIDAY
 
 
* SKY/WEATHER.....................MOSTLY SUNNY.  
* MAX TEMPERATURE.................68-82.  
* 24 HR TREND..................6 DEGREES WARMER.  
* MIN HUMIDITY....................27-46 PCT.  
* 24 HR TREND..................5 PCT DRIER.  
* WINDS - 20 FOOT...SLOPE/VALLEY..EAST 5 TO 15 MPH.  
* WINDS...10000 FT MSL............SOUTHEAST 10 TO 15 MPH.  
* CHANCE OF PRECIP................0 PERCENT.  
* LAL.............................1.  
* HAINES HIGH LEVEL INDEX.........4 OR LOW POTENTIAL FOR LARGE  
PLUME DOMINATED FIRE GROWTH.  
 
   
EXTENDED
 
   
SATURDAY
 
PARTLY CLOUDY WITH SLIGHT CHANCE OF SHOWERS AND  
THUNDERSTORMS. LOWS 50-64. HIGHS 70-85. EAST WINDS 15 TO 25 MPH.    
SUNDAY
 
PARTLY CLOUDY WITH CHANCE OF SHOWERS AND SLIGHT CHANCE  
OF THUNDERSTORMS. LOWS 48-63. HIGHS 67-82. EAST WINDS 15 TO  
25 MPH.    
MONDAY
 
PARTLY CLOUDY WITH SLIGHT CHANCE OF SHOWERS. LOWS  
48-62. HIGHS 66-79. SOUTHEAST WINDS 5 TO 15 MPH.    
TUESDAY
 
MOSTLY CLEAR WITH SLIGHT CHANCE OF SHOWERS. LOWS  
46-61. HIGHS 66-79.    
WEDNESDAY
 
MOSTLY CLEAR. LOWS 45-60. HIGHS 66-79.  
 

 
 
CAZ232-190330-  
IMPERIAL COUNTY AND EASTERN RIVERSIDE COUNTY-  
827 AM PDT THU OCT 18 2018  
   
TODAY
 
 
* SKY/WEATHER.....................SUNNY.  
* MAX TEMPERATURE.................77-85.  
* 24 HR TREND..................6 DEGREES WARMER.  
* MIN HUMIDITY....................19-24 PCT.  
* 24 HR TREND..................4 PCT DRIER.  
* WINDS - 20 FOOT...SLOPE/VALLEY..NORTH 5 TO 15 MPH.  
* WINDS...10000 FT MSL............NORTH 10 TO 20 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.  
   
TONIGHT
 
 
* SKY/WEATHER.....................CLEAR.  
* MIN TEMPERATURE.................59-66.  
* 24 HR TREND..................4 DEGREES WARMER.  
* MAX HUMIDITY....................35-50 PCT.  
* 24 HR TREND..................10 PCT DRIER.  
* WINDS - 20 FOOT...SLOPE/VALLEY..NORTH 5 TO 15 MPH.  
* WINDS...10000 FT MSL............NORTHEAST 15 TO 25 MPH.  
* CHANCE OF PRECIP................0 PERCENT.  
* CWR (>= 0.10 IN)................0 PERCENT.  
* LAL.............................1.  
   
FRIDAY
 
 
* SKY/WEATHER.....................SUNNY.  
* MAX TEMPERATURE.................80-89.  
* 24 HR TREND..................4 DEGREES WARMER.  
* MIN HUMIDITY....................16-21 PCT.  
* 24 HR TREND..................3 PCT DRIER.  
* WINDS - 20 FOOT...SLOPE/VALLEY..NORTH 5 TO 15 MPH.  
* WINDS...10000 FT MSL............NORTHEAST 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.  
 
   
EXTENDED
 
   
SATURDAY
 
MOSTLY CLEAR. LOWS 61-69. HIGHS 81-90. NORTH WINDS  
5 TO 15 MPH.    
SUNDAY
 
MOSTLY CLEAR WITH SLIGHT CHANCE OF SHOWERS. LOWS 62-69.  
HIGHS 80-89. NORTH WINDS 5 TO 10 MPH.    
MONDAY
 
MOSTLY CLEAR. LOWS 62-69. HIGHS 80-88. NORTH WINDS 5 TO  
10 MPH.    
TUESDAY
 
MOSTLY CLEAR. LOWS 62-69. HIGHS 80-89.    
WEDNESDAY
 
MOSTLY CLEAR. LOWS 62-69. HIGHS 80-89.  
 

 
 
CAZ230-190330-  
JOSHUA TREE NATIONAL PARK-  
827 AM PDT THU OCT 18 2018  
   
TODAY
 
 
* SKY/WEATHER.....................SUNNY.  
* MAX TEMPERATURE.................67-80.  
* 24 HR TREND..................5 DEGREES WARMER.  
* MIN HUMIDITY....................20-26 PCT.  
* 24 HR TREND..................5 PCT DRIER.  
* WINDS - 20 FOOT...SLOPE/VALLEY..NORTH 5 TO 15 MPH.  
* WINDS...10000 FT MSL............NORTHEAST 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.....................CLEAR.  
* MIN TEMPERATURE.................50-58.  
* 24 HR TREND..................3 DEGREES WARMER.  
* MAX HUMIDITY....................37-46 PCT.  
* 24 HR TREND..................8 PCT DRIER.  
* WINDS - 20 FOOT...SLOPE/VALLEY..NORTH 5 TO 15 MPH.  
* WINDS...10000 FT MSL............NORTHEAST 15 TO 25 MPH.  
* CHANCE OF PRECIP................0 PERCENT.  
* CWR (>= 0.10 IN)................0 PERCENT.  
* LAL.............................1.  
   
FRIDAY
 
 
* SKY/WEATHER.....................SUNNY.  
* MAX TEMPERATURE.................69-82.  
* 24 HR TREND..................3 DEGREES WARMER.  
* MIN HUMIDITY....................17-23 PCT.  
* 24 HR TREND..................3 PCT DRIER.  
* WINDS - 20 FOOT...SLOPE/VALLEY..NORTH 10 TO 20 MPH.  
* WINDS...10000 FT MSL............NORTHEAST 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.  
 
   
EXTENDED
 
   
SATURDAY
 
MOSTLY CLEAR. LOWS 51-61. HIGHS 70-82. NORTH WINDS  
5 TO 15 MPH.    
SUNDAY
 
MOSTLY CLEAR WITH SLIGHT CHANCE OF SHOWERS AND  
THUNDERSTORMS. LOWS 52-62. HIGHS 70-82. NORTHEAST WINDS 5 TO  
10 MPH.    
MONDAY
 
MOSTLY CLEAR. LOWS 53-62. HIGHS 70-83. NORTH WINDS 5 TO  
10 MPH.    
TUESDAY
 
MOSTLY CLEAR. LOWS 53-63. HIGHS 70-82.    
WEDNESDAY
 
MOSTLY CLEAR. LOWS 53-63. HIGHS 70-83.  
 

 
   
8 TO 10 DAY OUTLOOK
 
THURSDAY OCTOBER 25TH THROUGH SATURDAY  
OCTOBER 27TH: ABOVE NORMAL TEMPERATURES AND NEAR TO BELOW MEDIAN  
PRECIPITATION.  
 
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