593
FNUS55 KPSR 180815
FWFPSR
FIRE WEATHER PLANNING FORECAST FOR SOUTHWEST AND SOUTH-CENTRAL
ARIZONA AND SOUTHEAST CALIFORNIA
NATIONAL WEATHER SERVICE PHOENIX AZ
115 AM MST THU SEP 18 2025
DISCUSSION
ABUNDANT MOISTURE WITH A WEATHER SYSTEM RESIDING ACROSS WESTERN
PORTIONS OF THE REGION TODAY WILL HELP TO BRING FAIRLY WIDESPREAD
SHOWERS AND THUNDERSTORMS. BEST CHANCES WILL BE ACROSS SOUTHEAST
CALIFORNIA AND SOUTHWEST ARIZONA WHERE A FLOOD WATCH WILL BE IN
EFFECT FOR MUCH OF TODAY. RAIN CHANCES WILL CONTINUE INTO FRIDAY,
BUT MAINLY ACROSS THE ARIZONA HIGHER TERRAIN. HUMIDITIES WILL BE
ELEVATED OVER THE NEXT COUPLE OF DAYS WITH MINRHS MOSTLY BETWEEN
30-40% BEFORE GRADUALLY LOWERING CLOSER TO 20% BY SUNDAY. OUTSIDE
OF ANY STORMS, WINDS WILL REMAIN LIGHT OVER THE NEXT FEW DAYS WITH
DIRECTIONS MOSTLY FOLLOWING DIURNAL TRENDS.
..THUNDERSTORMS IMPLY GUSTY WINDS
NOTE...ADDITIONAL FIRE WEATHER FORECAST INFORMATION CAN BE FOUND
IN THE AREA FORECAST DISCUSSION. SEE PRODUCT PHXAFDPSR.
AZZ132-182015-
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-
115 AM MST THU SEP 18 2025
TODAY
* SKY/WEATHER.....................PARTLY SUNNY. SLIGHT CHANCE OF
SHOWERS AND THUNDERSTORMS IN THE MORNING BECOMING CHANCE OF
SHOWERS AND THUNDERSTORMS IN THE AFTERNOON.
* MAX TEMPERATURE.................91-99.
* 24 HR TREND..................4 DEGREES COOLER.
* MIN HUMIDITY....................34-46 PCT.
* 24 HR TREND..................13 PCT WETTER.
* WINDS - 20 FOOT...SLOPE/VALLEY..SOUTHEAST 5 TO 10 MPH IN THE
MORNING BECOMING WEST IN THE AFTERNOON.
* WINDS...10000 FT MSL............SOUTH 10 TO 20 MPH.
* CHANCE OF PRECIP................50 PERCENT.
* CWR (>= 0.10 IN)................50 PERCENT WEST PORTION...20
PERCENT EAST PORTION.
* CHANCE OF THUNDER...............37 PERCENT.
* MIXING HEIGHT FOR PHOENIX.......8600 FT AGL.
* TRANSPORT WIND FOR PHOENIX......SOUTHWEST 5 KNOTS.
* DISPERSION FOR PHOENIX..........FAIR.
TONIGHT
* SKY/WEATHER.....................PARTLY CLOUDY. CHANCE OF SHOWERS
AND THUNDERSTORMS IN THE EVENING BECOMING SLIGHT CHANCE OF
SHOWERS AND THUNDERSTORMS AFTER MIDNIGHT.
* MIN TEMPERATURE.................72-82.
* 24 HR TREND..................3 DEGREES COOLER.
* MAX HUMIDITY....................63-76 PCT.
* 24 HR TREND..................9 PCT WETTER.
* WINDS - 20 FOOT...SLOPE/VALLEY..WEST 5 TO 10 MPH IN THE EVENING
BECOMING NORTHEAST AFTER MIDNIGHT.
* WINDS...10000 FT MSL............SOUTH 15 TO 25 MPH.
* CHANCE OF PRECIP................50 PERCENT.
* CWR (>= 0.10 IN)................20 PERCENT.
* CHANCE OF THUNDER...............38 PERCENT.
FRIDAY
* SKY/WEATHER.....................PARTLY SUNNY. CHANCE OF SHOWERS
IN THE MORNING. SLIGHT CHANCE OF THUNDERSTORMS . SLIGHT CHANCE OF
SHOWERS IN THE AFTERNOON.
* MAX TEMPERATURE.................92-99.
* 24 HR TREND..................LITTLE CHANGE.
* MIN HUMIDITY....................32-40 PCT.
* 24 HR TREND..................3 PCT DRIER.
* WINDS - 20 FOOT...SLOPE/VALLEY..EAST 5 TO 10 MPH IN THE MORNING
BECOMING SOUTH IN THE AFTERNOON.
* WINDS...10000 FT MSL............SOUTHWEST 15 TO 25 MPH.
* CHANCE OF PRECIP................30 PERCENT.
* CWR (>= 0.10 IN)................0 PERCENT WEST PORTION...10
PERCENT EAST PORTION.
* CHANCE OF THUNDER...............20 PERCENT.
* MIXING HEIGHT FOR PHOENIX.......8300 FT AGL.
* TRANSPORT WIND FOR PHOENIX......SOUTHWEST 5 KNOTS.
* DISPERSION FOR PHOENIX..........GOOD.
EXTENDED
SATURDAY
MOSTLY CLEAR. LOWS 73-83. HIGHS 94-100. SOUTHWEST
WINDS 5 TO 10 MPH.
SUNDAY
MOSTLY CLEAR WITH SLIGHT CHANCE OF SHOWERS AND
THUNDERSTORMS. LOWS 73-83. HIGHS 93-100. NORTHWEST WINDS 5 TO
15 MPH.
MONDAY
MOSTLY CLEAR. LOWS 73-83. HIGHS 95-101. NORTHWEST WINDS
5 TO 10 MPH.
TUESDAY
MOSTLY CLEAR. LOWS 74-84. HIGHS 98-104.
WEDNESDAY
MOSTLY CLEAR. LOWS 75-85. HIGHS 99-105.
AZZ131-CAZ231-182015-
YUMA/MARTINEZ LAKE AND VICINITY/LOWER COLORADO RIVER VALLEY AZ-
LOWER COLORADO RIVER VALLEY CA-
115 AM MST THU SEP 18 2025 /115 AM PDT THU SEP 18 2025/
TODAY
* SKY/WEATHER.....................PARTLY SUNNY. CHANCE OF SHOWERS
AND SLIGHT CHANCE OF THUNDERSTORMS IN THE MORNING BECOMING
SHOWERS LIKELY AND CHANCE OF THUNDERSTORMS IN THE AFTERNOON.
* MAX TEMPERATURE.................92-99.
* 24 HR TREND..................5 DEGREES COOLER.
* MIN HUMIDITY....................43-56 PCT.
* 24 HR TREND..................18 PCT WETTER.
* WINDS - 20 FOOT...SLOPE/VALLEY..SOUTHEAST 5 TO 15 MPH.
* WINDS...10000 FT MSL............SOUTH 15 TO 25 MPH.
* CHANCE OF PRECIP................70 PERCENT.
* CWR (>= 0.10 IN)................60 PERCENT.
* CHANCE OF THUNDER...............51 PERCENT.
* MIXING HEIGHT FOR YUMA..........7800 FT AGL.
* TRANSPORT WIND FOR YUMA.........SOUTH 9 KNOTS.
* DISPERSION FOR YUMA.............GOOD.
TONIGHT
* SKY/WEATHER.....................MOSTLY CLEAR. CHANCE OF SHOWERS
AND SLIGHT CHANCE OF THUNDERSTORMS IN THE EVENING. SLIGHT CHANCE
OF SHOWERS AFTER MIDNIGHT.
* MIN TEMPERATURE.................72-79.
* 24 HR TREND..................4 DEGREES COOLER.
* MAX HUMIDITY....................74-93 PCT.
* 24 HR TREND..................13 PCT WETTER.
* WINDS - 20 FOOT...SLOPE/VALLEY..NORTHWEST 5 TO 15 MPH.
* WINDS...10000 FT MSL............SOUTH 15 TO 25 MPH.
* CHANCE OF PRECIP................40 PERCENT.
* CWR (>= 0.10 IN)................30 PERCENT.
* CHANCE OF THUNDER...............33 PERCENT.
FRIDAY
* SKY/WEATHER.....................PARTLY SUNNY. CHANCE OF SHOWERS
IN THE MORNING. SLIGHT CHANCE OF THUNDERSTORMS . SLIGHT CHANCE OF
SHOWERS IN THE AFTERNOON.
* MAX TEMPERATURE.................93-98.
* 24 HR TREND..................LITTLE CHANGE.
* MIN HUMIDITY....................35-44 PCT.
* 24 HR TREND..................9 PCT DRIER.
* WINDS - 20 FOOT...SLOPE/VALLEY..NORTHEAST 5 TO 10 MPH IN THE
MORNING BECOMING SOUTH IN THE AFTERNOON.
* WINDS...10000 FT MSL............SOUTHWEST 15 TO 25 MPH.
* CHANCE OF PRECIP................30 PERCENT.
* CWR (>= 0.10 IN)................0 PERCENT.
* CHANCE OF THUNDER...............14 PERCENT.
* MIXING HEIGHT FOR YUMA..........7500 FT AGL.
* TRANSPORT WIND FOR YUMA.........SOUTHWEST 5 KNOTS.
* DISPERSION FOR YUMA.............FAIR.
EXTENDED
SATURDAY
MOSTLY CLEAR. LOWS 73-79. HIGHS 95-100. SOUTHWEST
WINDS 5 TO 10 MPH.
SUNDAY
MOSTLY CLEAR WITH SLIGHT CHANCE OF SHOWERS AND
THUNDERSTORMS. LOWS 73-79. HIGHS 96-101. NORTHWEST WINDS 5 TO
15 MPH.
MONDAY
MOSTLY CLEAR. LOWS 73-80. HIGHS 97-102. NORTHWEST WINDS
5 TO 15 MPH.
TUESDAY
MOSTLY CLEAR. LOWS 74-80. HIGHS 99-104.
WEDNESDAY
MOSTLY CLEAR. LOWS 74-80. HIGHS 100-105.
AZZ133-182015-
SOUTHERN GILA COUNTY/TONTO NATIONAL FOREST FOOTHILLS-
SOUTHERN TONTO NF/WEST SAN CARLOS BIA/SOUTH PORTION FT APACHE BIA/
CAZ-
115 AM MST THU SEP 18 2025
TODAY
* SKY/WEATHER.....................PARTLY SUNNY. SLIGHT CHANCE OF
SHOWERS . CHANCE OF THUNDERSTORMS IN THE AFTERNOON.
* MAX TEMPERATURE.................81-95.
* 24 HR TREND..................3 DEGREES COOLER.
* MIN HUMIDITY....................29-41 PCT.
* 24 HR TREND..................9 PCT WETTER.
* WINDS - 20 FOOT...SLOPE/VALLEY..SOUTHEAST 5 TO 10 MPH IN THE
MORNING BECOMING SOUTHWEST IN THE AFTERNOON.
* WINDS...10000 FT MSL............LIGHT AND VARIABLE IN THE MORNING
BECOMING SOUTH 5 TO 15 MPH IN THE AFTERNOON.
* CHANCE OF PRECIP................40 PERCENT.
* CWR (>= 0.10 IN)................20 PERCENT.
* CHANCE OF THUNDER...............39 PERCENT.
TONIGHT
* SKY/WEATHER.....................PARTLY CLOUDY. CHANCE OF
THUNDERSTORMS IN THE EVENING. CHANCE OF SHOWERS . SLIGHT CHANCE
OF THUNDERSTORMS AFTER MIDNIGHT.
* MIN TEMPERATURE.................59-74.
* 24 HR TREND..................LITTLE CHANGE.
* MAX HUMIDITY....................66-87 PCT.
* 24 HR TREND..................9 PCT WETTER.
* WINDS - 20 FOOT...SLOPE/VALLEY..EAST 5 TO 15 MPH.
* WINDS...10000 FT MSL............SOUTHWEST 10 TO 20 MPH.
* CHANCE OF PRECIP................50 PERCENT.
* CWR (>= 0.10 IN)................20 PERCENT.
* CHANCE OF THUNDER...............43 PERCENT.
FRIDAY
* SKY/WEATHER.....................PARTLY SUNNY. SHOWERS LIKELY AND
SLIGHT CHANCE OF THUNDERSTORMS IN THE MORNING BECOMING CHANCE OF
SHOWERS AND THUNDERSTORMS IN THE AFTERNOON.
* MAX TEMPERATURE.................78-93.
* 24 HR TREND..................3 DEGREES COOLER.
* MIN HUMIDITY....................33-48 PCT.
* 24 HR TREND..................6 PCT WETTER.
* WINDS - 20 FOOT...SLOPE/VALLEY..EAST 5 TO 10 MPH IN THE MORNING
BECOMING SOUTHWEST IN THE AFTERNOON.
* WINDS...10000 FT MSL............SOUTHWEST 10 TO 20 MPH.
* CHANCE OF PRECIP................70 PERCENT.
* CWR (>= 0.10 IN)................40 PERCENT.
* CHANCE OF THUNDER...............40 PERCENT.
EXTENDED
SATURDAY
MOSTLY CLEAR WITH SLIGHT CHANCE OF SHOWERS AND
THUNDERSTORMS. LOWS 58-75. HIGHS 81-96. NORTHWEST WINDS 5 TO
15 MPH.
SUNDAY
MOSTLY CLEAR WITH SLIGHT CHANCE OF SHOWERS AND
THUNDERSTORMS. LOWS 58-75. HIGHS 81-96. NORTHWEST WINDS 5 TO
15 MPH.
MONDAY
MOSTLY CLEAR WITH SLIGHT CHANCE OF SHOWERS. LOWS 58-76.
HIGHS 83-98. NORTHWEST WINDS 5 TO 15 MPH.
TUESDAY
MOSTLY CLEAR. LOWS 58-77. HIGHS 86-101.
WEDNESDAY
MOSTLY CLEAR. LOWS 60-77. HIGHS 85-101.
CAZ232-182015-
IMPERIAL COUNTY AND EASTERN RIVERSIDE COUNTY-
115 AM PDT THU SEP 18 2025
TODAY
* SKY/WEATHER.....................PARTLY SUNNY. CHANCE OF SHOWERS
IN THE MORNING. CHANCE OF THUNDERSTORMS . SHOWERS LIKELY IN THE
AFTERNOON.
* MAX TEMPERATURE.................86-96.
* 24 HR TREND..................6 DEGREES COOLER.
* MIN HUMIDITY....................39-52 PCT.
* 24 HR TREND..................15 PCT WETTER.
* WINDS - 20 FOOT...SLOPE/VALLEY..SOUTHEAST 5 TO 15 MPH.
* WINDS...10000 FT MSL............SOUTH 20 TO 30 MPH.
* CHANCE OF PRECIP................70 PERCENT.
* CWR (>= 0.10 IN)................70 PERCENT.
* CHANCE OF THUNDER...............53 PERCENT.
TONIGHT
* SKY/WEATHER.....................MOSTLY CLEAR. CHANCE OF SHOWERS
AND SLIGHT CHANCE OF THUNDERSTORMS IN THE EVENING.
* MIN TEMPERATURE.................71-78.
* 24 HR TREND..................4 DEGREES COOLER.
* MAX HUMIDITY....................71-85 PCT.
* 24 HR TREND..................15 PCT WETTER.
* WINDS - 20 FOOT...SLOPE/VALLEY..NORTHWEST 5 TO 15 MPH.
* WINDS...10000 FT MSL............SOUTHWEST 20 TO 30 MPH.
* CHANCE OF PRECIP................30 PERCENT IN THE EVENING
BECOMING 0 PERCENT AFTER MIDNIGHT.
* CWR (>= 0.10 IN)................30 PERCENT.
* CHANCE OF THUNDER...............26 PERCENT.
FRIDAY
* SKY/WEATHER.....................MOSTLY SUNNY. CHANCE OF SHOWERS
IN THE MORNING. SLIGHT CHANCE OF SHOWERS AND THUNDERSTORMS IN THE
AFTERNOON.
* MAX TEMPERATURE.................88-97.
* 24 HR TREND..................LITTLE CHANGE.
* MIN HUMIDITY....................33-44 PCT.
* 24 HR TREND..................7 PCT DRIER.
* WINDS - 20 FOOT...SLOPE/VALLEY..NORTHWEST 5 TO 10 MPH IN THE
MORNING BECOMING SOUTH IN THE AFTERNOON.
* WINDS...10000 FT MSL............SOUTHWEST 20 TO 30 MPH.
* CHANCE OF PRECIP................20 PERCENT.
* CWR (>= 0.10 IN)................0 PERCENT.
* CHANCE OF THUNDER...............9 PERCENT.
EXTENDED
SATURDAY
MOSTLY CLEAR. LOWS 73-79. HIGHS 90-100. WEST WINDS
5 TO 10 MPH.
SUNDAY
MOSTLY CLEAR WITH SLIGHT CHANCE OF SHOWERS. LOWS 73-80.
HIGHS 90-98. NORTHWEST WINDS 5 TO 10 MPH.
MONDAY
MOSTLY CLEAR. LOWS 75-81. HIGHS 91-100. NORTHWEST WINDS
5 TO 15 MPH.
TUESDAY
MOSTLY CLEAR. LOWS 75-81. HIGHS 94-103.
WEDNESDAY
CLEAR. LOWS 74-80. HIGHS 95-103.
CAZ230-182015-
JOSHUA TREE NATIONAL PARK-
115 AM PDT THU SEP 18 2025
TODAY
* SKY/WEATHER.....................MOSTLY CLOUDY. CHANCE OF SHOWERS
IN THE MORNING. CHANCE OF THUNDERSTORMS . SHOWERS LIKELY IN THE
AFTERNOON.
* MAX TEMPERATURE.................76-87.
* 24 HR TREND..................10 DEGREES COOLER.
* MIN HUMIDITY....................43-53 PCT.
* 24 HR TREND..................22 PCT WETTER.
* WINDS - 20 FOOT...SLOPE/VALLEY..SOUTH 5 TO 15 MPH.
* WINDS...10000 FT MSL............SOUTH 20 TO 30 MPH.
* CHANCE OF PRECIP................70 PERCENT.
* CWR (>= 0.10 IN)................70 PERCENT.
* CHANCE OF THUNDER...............52 PERCENT.
TONIGHT
* SKY/WEATHER.....................MOSTLY CLEAR. CHANCE OF
THUNDERSTORMS AND SLIGHT CHANCE OF SHOWERS IN THE EVENING.
* MIN TEMPERATURE.................60-72.
* 24 HR TREND..................6 DEGREES COOLER.
* MAX HUMIDITY....................78-93 PCT.
* 24 HR TREND..................24 PCT WETTER.
* WINDS - 20 FOOT...SLOPE/VALLEY..SOUTH 5 TO 15 MPH.
* WINDS...10000 FT MSL............SOUTH 20 TO 30 MPH.
* CHANCE OF PRECIP................40 PERCENT IN THE EVENING
BECOMING 10 PERCENT AFTER MIDNIGHT.
* CWR (>= 0.10 IN)................30 PERCENT.
* CHANCE OF THUNDER...............27 PERCENT.
FRIDAY
* SKY/WEATHER.....................PARTLY SUNNY. SLIGHT CHANCE OF
SHOWERS . SLIGHT CHANCE OF THUNDERSTORMS IN THE AFTERNOON.
* MAX TEMPERATURE.................77-91.
* 24 HR TREND..................LITTLE CHANGE.
* MIN HUMIDITY....................36-50 PCT.
* 24 HR TREND..................5 PCT DRIER.
* WINDS - 20 FOOT...SLOPE/VALLEY..SOUTHWEST 5 TO 15 MPH.
* WINDS...10000 FT MSL............SOUTHWEST 20 TO 30 MPH.
* CHANCE OF PRECIP................20 PERCENT.
* CWR (>= 0.10 IN)................0 PERCENT.
* CHANCE OF THUNDER...............15 PERCENT.
EXTENDED
SATURDAY
CLEAR. LOWS 60-73. HIGHS 79-92. WEST WINDS 5 TO
10 MPH.
SUNDAY
MOSTLY CLEAR WITH SLIGHT CHANCE OF SHOWERS. LOWS 62-73.
HIGHS 79-91. NORTHWEST WINDS 5 TO 10 MPH.
MONDAY
MOSTLY CLEAR. LOWS 63-76. HIGHS 80-93. NORTH WINDS 5 TO
15 MPH.
TUESDAY
MOSTLY CLEAR. LOWS 64-76. HIGHS 83-96.
WEDNESDAY
CLEAR. LOWS 62-75. HIGHS 82-97.
8 TO 10 DAY OUTLOOK
THURSDAY SEPTEMBER 25TH THROUGH SATURDAY
SEPTEMBER 27TH: ABOVE NORMAL TEMPERATURES AND NEAR TO BELOW
MEDIAN PRECIPITATION.
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