000 FNUS55 KPSR 221148 FWFPSR FIRE WEATHER PLANNING FORECAST FOR SOUTHWEST AND SOUTH-CENTRAL ARIZONA AND SOUTHEAST CALIFORNIA NATIONAL WEATHER SERVICE PHOENIX AZ 448 AM MST THU MAY 22 2008 .DISCUSSION... AN UNSEASONABLY STRONG LOW PRESSURE SYSTEM WILL CONTINUE TO MOVE INTO THE SOUTHWEST UNITED STATES TODAY. MUCH COOLER TEMPERATURES AND HIGHER HUMIDITY ARE IN STORE BOTH TODAY AND FRIDAY. WINDS WILL STILL BE BREEZY...BUT ARE EXPECTED TO REMAIN UNDER CRITICAL THRESHOLDS. IN ADDITION...THERE WILL BE INCREASING CHANCES OF SHOWERS AND THUNDERSTORMS ...PRIMARILY OVER SOUTH-CENTRAL ARIZONA THIS AFTERNOON...CONTINUING INTO FRIDAY NIGHT. IMPROVING WEATHER IS ANTICIPATED BY SATURDAY WITH DECREASING CHANCES OF SHOWERS ALONG WITH WARMER TEMPERATURES. ...THUNDERSTORMS IMPLY GUSTY WINDS... AZZ132-230000- 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- 448 AM MST THU MAY 22 2008 .TODAY... SKY/WEATHER.....................PARTLY SUNNY. SLIGHT CHANCE OF SHOWERS THROUGH THE DAY. SLIGHT CHANCE OF THUNDERSTORMS IN THE AFTERNOON. MAX TEMPERATURE.................76-84. 24 HR TREND..................11 DEGREES COOLER. MIN HUMIDITY....................16-24 PCT. 24 HR TREND..................10 PCT WETTER. WINDS - 20 FEET...SLOPE/VALLEY..SOUTHWEST 15 TO 25 MPH. WINDS...10000 FT MSL............SOUTHWEST 20 TO 30 MPH. CHANCE OF PRECIP................20 PERCENT. LAL.............................1 IN THE MORNING...BECOMING 2 IN THE AFTERNOON. HAINES HIGH LEVEL INDEX.........4 OR LOW POTENTIAL FOR LARGE PLUME DOMINATED FIRE GROWTH. MIXING HEIGHT FOR PHOENIX.......13000 FT AGL. TRANSPORT WIND FOR PHOENIX......SOUTHWEST 22 KNOTS. DISPERSION FOR PHOENIX..........EXCELLENT. .TONIGHT... SKY/WEATHER.....................MOSTLY CLOUDY. CHANCE OF SHOWERS AND THUNDERSTORMS. MIN TEMPERATURE.................53-63. 24 HR TREND..................7 DEGREES COOLER. MAX HUMIDITY....................51-69 PCT. 24 HR TREND..................32 PCT WETTER. WINDS - 20 FEET...SLOPE/VALLEY..SOUTHWEST 10 TO 20 MPH. WINDS...10000 FT MSL............SOUTHWEST 15 TO 25 MPH. CHANCE OF PRECIP................30 PERCENT WEST PORTION...60 PERCENT EAST PORTION. LAL.............................3. .FRIDAY... SKY/WEATHER.....................MOSTLY CLOUDY. CHANCE OF SHOWERS AND THUNDERSTORMS. MAX TEMPERATURE.................68-76. 24 HR TREND..................8 DEGREES COOLER. MIN HUMIDITY....................24-37 PCT. 24 HR TREND..................12 PCT WETTER. WINDS - 20 FEET...SLOPE/VALLEY..SOUTH 10 TO 20 MPH. WINDS...10000 FT MSL............SOUTH 15 TO 25 MPH. CHANCE OF PRECIP................30 PERCENT WEST PORTION...50 PERCENT EAST PORTION. LAL.............................3. HAINES HIGH LEVEL INDEX.........3 OR VERY LOW POTENTIAL FOR LARGE PLUME DOMINATED FIRE GROWTH. MIXING HEIGHT FOR PHOENIX.......7000 FT AGL. TRANSPORT WIND FOR PHOENIX......SOUTH 17 KNOTS. DISPERSION FOR PHOENIX..........EXCELLENT. .EXTENDED... .SATURDAY...PARTLY CLOUDY WITH SLIGHT CHANCE OF SHOWERS AND THUNDERSTORMS. LOWS 52-62. HIGHS 72-79. SOUTH WINDS 10 TO 20 MPH. .SUNDAY...WARMER. MOSTLY CLEAR. LOWS 53-63. HIGHS 82-90. SOUTH WINDS 5 TO 15 MPH. MINIMUM RELATIVE HUMIDITY MAY BE LOWER THAN 15 PERCENT. .MONDAY...MOSTLY CLEAR. LOWS 58-68. HIGHS 86-93. SOUTHWEST WINDS 10 TO 20 MPH. MINIMUM RELATIVE HUMIDITY MAY BE LOWER THAN 15 PERCENT. .TUESDAY...MOSTLY CLEAR. LOWS 62-72. HIGHS 89-96. .WEDNESDAY...MOSTLY CLEAR. LOWS 63-73. HIGHS 92-99. $$ AZZ133-230000- SOUTHERN GILA COUNTY/TONTO NATIONAL FOREST FOOTHILLS- SOUTHERN TONTO NF/WEST SAN CARLOS BIA/SOUTH PORTION FT APACHE BIA/ CAZ- 448 AM MST THU MAY 22 2008 .TODAY... SKY/WEATHER.....................MOSTLY CLOUDY. CHANCE OF SHOWERS THROUGH THE DAY. CHANCE OF THUNDERSTORMS IN THE AFTERNOON. MAX TEMPERATURE.................63-76. 24 HR TREND..................14 DEGREES COOLER. MIN HUMIDITY....................24-39 PCT. 24 HR TREND..................21 PCT WETTER. WINDS - 20 FEET...SLOPE/VALLEY..SOUTHWEST 10 TO 20 MPH. WINDS...10000 FT MSL............SOUTHWEST 30 TO 40 MPH. CHANCE OF PRECIP................50 PERCENT. LAL.............................1 IN THE MORNING...BECOMING 3 IN THE AFTERNOON. HAINES HIGH LEVEL INDEX.........4 OR LOW POTENTIAL FOR LARGE PLUME DOMINATED FIRE GROWTH. .TONIGHT... SKY/WEATHER.....................MOSTLY CLOUDY. SHOWERS AND THUNDERSTORMS LIKELY IN THE EVENING...BECOMING SHOWERS AND THUNDERSTORMS AFTER MIDNIGHT. MIN TEMPERATURE.................41-55. 24 HR TREND..................9 DEGREES COOLER. MAX HUMIDITY....................66-100 PCT. 24 HR TREND..................41 PCT WETTER. WINDS - 20 FEET...SLOPE/VALLEY..SOUTHWEST 5 TO 15 MPH. WINDS...10000 FT MSL............SOUTHWEST 40 TO 50 MPH. CHANCE OF PRECIP................80 PERCENT. LAL.............................5. .FRIDAY... SKY/WEATHER.....................MOSTLY CLOUDY. SHOWERS AND THUNDERSTORMS IN THE MORNING...BECOMING SHOWERS AND THUNDERSTORMS LIKELY IN THE AFTERNOON. MAX TEMPERATURE.................55-69. 24 HR TREND..................8 DEGREES COOLER. MIN HUMIDITY....................37-53 PCT. 24 HR TREND..................13 PCT WETTER. WINDS - 20 FEET...SLOPE/VALLEY..SOUTH 5 TO 15 MPH. WINDS...10000 FT MSL............SOUTH 30 TO 40 MPH. CHANCE OF PRECIP................70 PERCENT. LAL.............................5. HAINES HIGH LEVEL INDEX.........3 OR VERY LOW POTENTIAL FOR LARGE PLUME DOMINATED FIRE GROWTH. .EXTENDED... .SATURDAY...PARTLY CLOUDY WITH CHANCE OF SHOWERS AND THUNDERSTORMS. LOWS 39-56. HIGHS 63-76. SOUTH WINDS 10 TO 20 MPH. .SUNDAY...MOSTLY CLEAR WITH SLIGHT CHANCE OF SHOWERS. LOWS 41-61. HIGHS 73-86. SOUTH WINDS 5 TO 15 MPH. .MONDAY...MOSTLY CLEAR. LOWS 43-62. HIGHS 76-89. SOUTH WINDS 10 TO 20 MPH. MINIMUM RELATIVE HUMIDITY MAY BE LOWER THAN 15 PERCENT. .TUESDAY...MOSTLY CLEAR. LOWS 44-64. HIGHS 78-92. .WEDNESDAY...MOSTLY CLEAR. LOWS 47-68. HIGHS 82-95. $$ AZZ131-CAZ231-230000- YUMA/MARTINEZ LAKE AND VICINITY/LOWER COLORADO RIVER VALLEY AZ- LOWER COLORADO RIVER VALLEY CA- 448 AM MST THU MAY 22 2008 /448 AM PDT THU MAY 22 2008/ .TODAY... SKY/WEATHER.....................PARTLY SUNNY. SLIGHT CHANCE OF SHOWERS THROUGH THE DAY. SLIGHT CHANCE OF THUNDERSTORMS IN THE AFTERNOON. MAX TEMPERATURE.................81-85. 24 HR TREND..................10 DEGREES COOLER. MIN HUMIDITY....................11-19 PCT. 24 HR TREND..................4 PCT WETTER. WINDS - 20 FEET...SLOPE/VALLEY..WEST 10 TO 20 MPH. WINDS...10000 FT MSL............WEST 15 TO 25 MPH. CHANCE OF PRECIP................20 PERCENT. LAL.............................1 IN THE MORNING...BECOMING 2 IN THE AFTERNOON. HAINES HIGH LEVEL INDEX.........4 OR LOW POTENTIAL FOR LARGE PLUME DOMINATED FIRE GROWTH. MIXING HEIGHT FOR YUMA..........15000 FT AGL. TRANSPORT WIND FOR YUMA.........WEST 16 KNOTS. DISPERSION FOR YUMA.............EXCELLENT. .TONIGHT... SKY/WEATHER.....................PARTLY CLOUDY. SLIGHT CHANCE OF SHOWERS AND THUNDERSTORMS. MIN TEMPERATURE.................57-61. 24 HR TREND..................7 DEGREES COOLER. MAX HUMIDITY....................42-60 PCT. 24 HR TREND..................22 PCT WETTER. WINDS - 20 FEET...SLOPE/VALLEY..SOUTHWEST 10 TO 20 MPH. WINDS...10000 FT MSL............WEST 5 TO 15 MPH IN THE EVENING...BECOMING LIGHT AND VARIABLE AFTER MIDNIGHT. CHANCE OF PRECIP................20 PERCENT. LAL.............................2. .FRIDAY... SKY/WEATHER.....................PARTLY SUNNY. CHANCE OF SHOWERS AND THUNDERSTORMS. MAX TEMPERATURE.................76-80. 24 HR TREND..................5 DEGREES COOLER. MIN HUMIDITY....................20-26 PCT. 24 HR TREND..................9 PCT WETTER. WINDS - 20 FEET...SLOPE/VALLEY..SOUTH 10 TO 20 MPH. WINDS...10000 FT MSL............SOUTH 10 TO 15 MPH. CHANCE OF PRECIP................30 PERCENT. LAL.............................3. HAINES HIGH LEVEL INDEX.........3 OR VERY LOW POTENTIAL FOR LARGE PLUME DOMINATED FIRE GROWTH. MIXING HEIGHT FOR YUMA..........10500 FT AGL. TRANSPORT WIND FOR YUMA.........SOUTH 6 KNOTS. DISPERSION FOR YUMA.............GOOD. .EXTENDED... .SATURDAY...PARTLY CLOUDY WITH SLIGHT CHANCE OF SHOWERS AND THUNDERSTORMS. LOWS 56-61. HIGHS 77-81. SOUTHWEST WINDS 10 TO 20 MPH. .SUNDAY...MOSTLY CLEAR. LOWS 58-65. HIGHS 85-90. SOUTHWEST WINDS 5 TO 15 MPH. .MONDAY...MOSTLY CLEAR. LOWS 60-67. HIGHS 89-95. WEST WINDS 5 TO 15 MPH. MINIMUM RELATIVE HUMIDITY MAY BE LOWER THAN 15 PERCENT. .TUESDAY...MOSTLY CLEAR. LOWS 62-68. HIGHS 92-97. .WEDNESDAY...MOSTLY CLEAR. LOWS 64-70. HIGHS 96-100. $$ CAZ230-230000- JOSHUA TREE NATIONAL PARK- 448 AM PDT THU MAY 22 2008 .TODAY... SKY/WEATHER.....................PARTLY SUNNY. SLIGHT CHANCE OF SHOWERS THROUGH THE DAY. SLIGHT CHANCE OF THUNDERSTORMS IN THE AFTERNOON. MAX TEMPERATURE.................66-80. 24 HR TREND..................7 DEGREES COOLER. MIN HUMIDITY....................13-23 PCT. 24 HR TREND..................11 PCT WETTER. WINDS - 20 FEET...SLOPE/VALLEY..NORTHWEST 10 TO 20 MPH. WINDS...10000 FT MSL............NORTHWEST 10 TO 20 MPH. CHANCE OF PRECIP................20 PERCENT. LAL.............................1 IN THE MORNING...BECOMING 2 IN THE AFTERNOON. HAINES HIGH LEVEL INDEX.........3 OR VERY LOW POTENTIAL FOR LARGE PLUME DOMINATED FIRE GROWTH. .TONIGHT... SKY/WEATHER.....................PARTLY CLOUDY. CHANCE OF SHOWERS AND THUNDERSTORMS. MIN TEMPERATURE.................46-56. 24 HR TREND..................7 DEGREES COOLER. MAX HUMIDITY....................53-69 PCT. 24 HR TREND..................32 PCT WETTER. WINDS - 20 FEET...SLOPE/VALLEY..WEST 5 TO 15 MPH. WINDS...10000 FT MSL............NORTHWEST 10 TO 20 MPH. CHANCE OF PRECIP................30 PERCENT. LAL.............................3. .FRIDAY... SKY/WEATHER.....................PARTLY SUNNY. CHANCE OF SHOWERS AND THUNDERSTORMS. MAX TEMPERATURE.................63-78. 24 HR TREND..................LITTLE CHANGE. MIN HUMIDITY....................23-38 PCT. 24 HR TREND..................13 PCT WETTER. WINDS - 20 FEET...SLOPE/VALLEY..SOUTH 5 TO 15 MPH. WINDS...10000 FT MSL............LIGHT AND VARIABLE IN THE MORNING...BECOMING SOUTH 5 TO 15 MPH IN THE AFTERNOON. CHANCE OF PRECIP................40 PERCENT. LAL.............................3. HAINES HIGH LEVEL INDEX.........3 OR VERY LOW POTENTIAL FOR LARGE PLUME DOMINATED FIRE GROWTH. .EXTENDED... .SATURDAY...PARTLY CLOUDY WITH SLIGHT CHANCE OF SHOWERS AND THUNDERSTORMS. LOWS 47-57. HIGHS 63-76. SOUTHWEST WINDS 10 TO 20 MPH. .SUNDAY...MOSTLY CLEAR. LOWS 47-60. HIGHS 70-84. SOUTHWEST WINDS 5 TO 15 MPH. .MONDAY...MOSTLY CLEAR. LOWS 49-63. HIGHS 74-88. SOUTHWEST WINDS 10 TO 20 MPH. .TUESDAY...MOSTLY CLEAR. LOWS 52-65. HIGHS 78-91. .WEDNESDAY...MOSTLY CLEAR. LOWS 54-67. HIGHS 80-93. $$ CAZ232-230000- IMPERIAL COUNTY AND EASTERN RIVERSIDE COUNTY- 448 AM PDT THU MAY 22 2008 .TODAY... SKY/WEATHER.....................PARTLY SUNNY. SLIGHT CHANCE OF SHOWERS THROUGH THE DAY. SLIGHT CHANCE OF THUNDERSTORMS IN THE AFTERNOON. MAX TEMPERATURE.................75-85. 24 HR TREND..................5 DEGREES COOLER. MIN HUMIDITY....................12-23 PCT. 24 HR TREND..................6 PCT WETTER. WINDS - 20 FEET...SLOPE/VALLEY..NORTHWEST 10 TO 20 MPH. WINDS...10000 FT MSL............WEST 15 TO 25 MPH. CHANCE OF PRECIP................20 PERCENT. LAL.............................1 IN THE MORNING...BECOMING 2 IN THE AFTERNOON. HAINES HIGH LEVEL INDEX.........3 OR VERY LOW POTENTIAL FOR LARGE PLUME DOMINATED FIRE GROWTH. .TONIGHT... SKY/WEATHER.....................PARTLY CLOUDY. SLIGHT CHANCE OF SHOWERS AND THUNDERSTORMS. MIN TEMPERATURE.................55-60. 24 HR TREND..................7 DEGREES COOLER. MAX HUMIDITY....................46-78 PCT. 24 HR TREND..................28 PCT WETTER. WINDS - 20 FEET...SLOPE/VALLEY..SOUTHWEST 5 TO 15 MPH. WINDS...10000 FT MSL............NORTHWEST 10 TO 20 MPH. CHANCE OF PRECIP................20 PERCENT. LAL.............................2. .FRIDAY... SKY/WEATHER.....................PARTLY SUNNY. CHANCE OF SHOWERS AND THUNDERSTORMS. MAX TEMPERATURE.................72-80. 24 HR TREND..................4 DEGREES COOLER. MIN HUMIDITY....................21-33 PCT. 24 HR TREND..................10 PCT WETTER. WINDS - 20 FEET...SLOPE/VALLEY..SOUTHWEST 10 TO 20 MPH. WINDS...10000 FT MSL............LIGHT AND VARIABLE IN THE MORNING...BECOMING SOUTHEAST 5 TO 15 MPH IN THE AFTERNOON. CHANCE OF PRECIP................30 PERCENT. LAL.............................3. HAINES HIGH LEVEL INDEX.........3 OR VERY LOW POTENTIAL FOR LARGE PLUME DOMINATED FIRE GROWTH. .EXTENDED... .SATURDAY...PARTLY CLOUDY WITH SLIGHT CHANCE OF SHOWERS AND THUNDERSTORMS. LOWS 55-61. HIGHS 72-80. SOUTHWEST WINDS 10 TO 20 MPH. .SUNDAY...MOSTLY CLEAR. LOWS 58-64. HIGHS 78-89. SOUTHWEST WINDS 5 TO 15 MPH. .MONDAY...MOSTLY CLEAR. LOWS 61-67. HIGHS 82-93. WEST WINDS 10 TO 20 MPH. MINIMUM RELATIVE HUMIDITY MAY BE LOWER THAN 15 PERCENT. .TUESDAY...MOSTLY CLEAR. LOWS 62-69. HIGHS 86-96. .WEDNESDAY...MOSTLY CLEAR. LOWS 64-70. HIGHS 88-100. $$ .8 TO 10 DAY OUTLOOK...THURSDAY MAY 29TH THROUGH SATURDAY MAY 31ST ...ABOVE NORMAL TEMPERATURES WITH NO PRECIPITATION EXPECTED.