Routine Fire Wx Fcst (With/Without 6-10 Day Outlook)
Issued by NWS Phoenix, AZ
Issued by NWS Phoenix, AZ
657 FNUS55 KPSR 182040 FWFPSR Fire Weather Planning Forecast for Southwest and South-Central Arizona and Southeast California National Weather Service Phoenix AZ 140 PM MST Mon Aug 18 2025 .DISCUSSION... Temperatures and thunderstorm chances will once again trend upward this week. Thunderstorm chances Tuesday and Wednesday will increase primarily across southern Gila County during the afternoons. Lightning and gusty, erratic outflow winds will be the primary concerns with any thunderstorms. Chances for seeing outflow wind gusts in excess of 35 mph are around 30-50% for Tuesday afternoon. Winds will otherwise favor diurnal upslope/downvalley patterns with afternoon gusts in the 15-20 mph range. Min RHs will be around 15-25% over the next couple of days. Overnight Max RHs will generally be around 25-40% for most areas with higher values across southern Gila County by Wednesday. ...Thunderstorms imply gusty winds... Note...Additional Fire Weather Forecast information can be found in the Area Forecast Discussion. See product PHXAFDPSR. AZZ132-190845- 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- 140 PM MST Mon Aug 18 2025 .TONIGHT... * Sky/weather.....................Mostly clear. * Min Temperature.................79-89. * 24 hr trend..................3 degrees warmer. * Max Humidity....................23-40 pct. * 24 hr trend..................Little RH change. * Winds - 20 foot...Slope/Valley..Southwest 5 to 15 mph. * Winds...10000 FT MSL............Southeast 10 to 15 mph. * Chance of Precip................0 percent. * CWR (>= 0.10 IN)................0 percent. * Chance of Thunder...............2 percent. .TUESDAY... * Sky/weather.....................Mostly sunny. * Max Temperature.................103-109. * 24 hr trend..................Little change. * Min Humidity....................12-16 pct. * 24 hr trend..................Little RH change. * Winds - 20 foot...Slope/Valley..Southwest 5 to 15 mph. * Winds...10000 FT MSL............East 5 to 15 mph in the morning becoming light and variable in the afternoon. * Chance of Precip................0 percent. * CWR (>= 0.10 IN)................0 percent. * Chance of Thunder...............4 percent. * Mixing Height for Phoenix.......8100 ft AGL. * Transport Wind for Phoenix......West 6 knots. * Dispersion for Phoenix..........Good. .TUESDAY NIGHT... * Sky/weather.....................Mostly clear. * Min Temperature.................80-90. * 24 hr trend..................3 degrees warmer. * Max Humidity....................25-37 pct. * 24 hr trend..................Little RH change. * Winds - 20 foot...Slope/Valley..Southwest 5 to 15 mph. * Winds...10000 FT MSL............Southeast 10 to 15 mph. * Chance of Precip................0 percent. * CWR (>= 0.10 IN)................0 percent. * Chance of Thunder...............3 percent. .WEDNESDAY... * Sky/weather.....................Mostly sunny. * Max Temperature.................106-112. * 24 hr trend..................3 degrees warmer. * Min Humidity....................13-19 pct. * 24 hr trend..................Little RH change. * Winds - 20 foot...Slope/Valley..Southeast 5 to 10 mph in the morning becoming southwest in the afternoon. * Winds...10000 FT MSL............Southeast 5 to 15 mph. * Chance of Precip................0 percent. * CWR (>= 0.10 IN)................0 percent. * Chance of Thunder...............5 percent. * Mixing Height for Phoenix.......8700 ft AGL. * Transport Wind for Phoenix......Southwest 4 knots. * Dispersion for Phoenix..........Fair. .EXTENDED... .THURSDAY...Mostly clear with slight chance of showers and thunderstorms. Lows 84-94. Highs 107-113. South winds 5 to 10 mph. .FRIDAY...Partly cloudy with slight chance of showers and thunderstorms. Lows 83-93. Highs 107-113. South winds 5 to 15 mph. .SATURDAY...Partly cloudy with chance of showers and slight chance of thunderstorms. Lows 83-93. Highs 104-110. Southwest winds 5 to 10 mph. .SUNDAY...Partly cloudy with slight chance of showers and thunderstorms. Lows 82-92. Highs 104-111. .MONDAY...Partly cloudy with slight chance of showers and thunderstorms. Lows 78-88. Highs 100-105. $$ AZZ131-CAZ231-190845- Yuma/Martinez Lake and Vicinity/Lower Colorado River Valley AZ- Lower Colorado River Valley CA- 140 PM MST Mon Aug 18 2025 /140 PM PDT Mon Aug 18 2025/ .TONIGHT... * Sky/weather.....................Mostly clear. * Min Temperature.................77-82. * 24 hr trend..................5 degrees warmer. * Max Humidity....................31-53 pct. * 24 hr trend..................Little RH change. * Winds - 20 foot...Slope/Valley..South 5 to 15 mph. * Winds...10000 FT MSL............South 10 to 20 mph. * Chance of Precip................0 percent. * CWR (>= 0.10 IN)................0 percent. * Chance of Thunder...............1 percent. .TUESDAY... * Sky/weather.....................Mostly sunny. * Max Temperature.................105-110. * 24 hr trend..................Little change. * Min Humidity....................14-18 pct. * 24 hr trend..................3 pct wetter. * Winds - 20 foot...Slope/Valley..South 5 to 15 mph. * Winds...10000 FT MSL............Southeast 10 to 20 mph. * Chance of Precip................0 percent. * CWR (>= 0.10 IN)................0 percent. * Chance of Thunder...............4 percent. * Mixing Height for Yuma..........7400 ft AGL. * Transport Wind for Yuma.........South 8 knots. * Dispersion for Yuma.............Good. .TUESDAY NIGHT... * Sky/weather.....................Mostly clear. * Min Temperature.................80-85. * 24 hr trend..................4 degrees warmer. * Max Humidity....................26-36 pct. * 24 hr trend..................9 pct drier. * Winds - 20 foot...Slope/Valley..South 5 to 15 mph. * Winds...10000 FT MSL............Southeast 10 to 20 mph. * Chance of Precip................0 percent. * CWR (>= 0.10 IN)................0 percent. * Chance of Thunder...............1 percent. .WEDNESDAY... * Sky/weather.....................Mostly sunny. * Max Temperature.................107-112. * 24 hr trend..................3 degrees warmer. * Min Humidity....................13-17 pct. * 24 hr trend..................Little change. * Winds - 20 foot...Slope/Valley..Southwest 5 to 15 mph. * Winds...10000 FT MSL............South 5 to 15 mph in the morning becoming light and variable in the afternoon. * Chance of Precip................0 percent. * CWR (>= 0.10 IN)................0 percent. * Chance of Thunder...............2 percent. * Mixing Height for Yuma..........9400 ft AGL. * Transport Wind for Yuma.........South 6 knots. * Dispersion for Yuma.............Good. .EXTENDED... .THURSDAY...Mostly clear with slight chance of showers and thunderstorms. Lows 83-89. Highs 110-115. South winds 5 to 10 mph. .FRIDAY...Partly cloudy with slight chance of showers and thunderstorms. Lows 84-89. Highs 110-115. South winds 5 to 15 mph. .SATURDAY...Partly cloudy with slight chance of showers and thunderstorms. Lows 84-89. Highs 106-111. South winds 5 to 15 mph. .SUNDAY...Partly cloudy with slight chance of showers and thunderstorms. Lows 83-88. Highs 107-112. .MONDAY...Partly cloudy with slight chance of showers and thunderstorms. Lows 80-87. Highs 102-107. $$ AZZ133-190845- Southern Gila County/Tonto National Forest Foothills- Southern Tonto NF/West San Carlos BIA/South Portion Ft Apache BIA/ CAZ- 140 PM MST Mon Aug 18 2025 .TONIGHT... * Sky/weather.....................Partly cloudy. * Min Temperature.................65-81. * 24 hr trend..................Little change. * Max Humidity....................29-54 pct. * 24 hr trend..................9 pct wetter. * Winds - 20 foot...Slope/Valley..Southwest 5 to 10 mph in the evening becoming southeast after midnight. * Winds...10000 FT MSL............Northeast 5 to 15 mph. * Chance of Precip................0 percent. * CWR (>= 0.10 IN)................0 percent. * Chance of Thunder...............6 percent. .TUESDAY... * Sky/weather.....................Mostly sunny. Slight chance of showers and thunderstorms in the afternoon. * Max Temperature.................90-104. * 24 hr trend..................Little change. * Min Humidity....................13-23 pct. * 24 hr trend..................3 pct wetter. * Winds - 20 foot...Slope/Valley..Southeast 5 to 10 mph in the morning becoming southwest in the afternoon. * Winds...10000 FT MSL............Northeast 5 to 15 mph in the morning becoming light and variable in the afternoon. * Chance of Precip................0 percent in the morning becoming 20 percent in the afternoon. * CWR (>= 0.10 IN)................0 percent. * Chance of Thunder...............17 percent. .TUESDAY NIGHT... * Sky/weather.....................Partly cloudy. Chance of showers and slight chance of thunderstorms in the evening. * Min Temperature.................66-84. * 24 hr trend..................Little change. * Max Humidity....................35-62 pct. * 24 hr trend..................8 pct wetter. * Winds - 20 foot...Slope/Valley..Southeast 5 to 10 mph in the evening becoming east after midnight. * Winds...10000 FT MSL............Light and variable. * Chance of Precip................20 percent in the evening becoming 0 percent after midnight. * CWR (>= 0.10 IN)................0 percent. * Chance of Thunder...............20 percent. .WEDNESDAY... * Sky/weather.....................Partly sunny. Chance of showers and slight chance of thunderstorms . * Max Temperature.................91-107. * 24 hr trend..................Little change. * Min Humidity....................18-31 pct. * 24 hr trend..................6 pct wetter. * Winds - 20 foot...Slope/Valley..East 5 to 10 mph in the morning becoming south in the afternoon. * Winds...10000 FT MSL............Southeast 5 to 15 mph. * Chance of Precip................30 percent. * CWR (>= 0.10 IN)................10 percent. * Chance of Thunder...............31 percent. .EXTENDED... .THURSDAY...Partly cloudy with chance of showers and thunderstorms. Lows 66-86. Highs 92-108. East winds 5 to 15 mph. .FRIDAY...Partly cloudy with chance of showers and thunderstorms. Lows 66-84. Highs 92-108. East winds 5 to 15 mph. .SATURDAY...Partly cloudy with chance of showers and thunderstorms. Lows 66-84. Highs 90-105. East winds 5 to 15 mph. .SUNDAY...Partly cloudy with slight chance of showers and thunderstorms. Lows 65-84. Highs 91-106. .MONDAY...Partly cloudy with slight chance of showers and thunderstorms. Lows 63-83. Highs 89-103. $$ CAZ232-190845- Imperial County And Eastern Riverside County- 140 PM PDT Mon Aug 18 2025 .TONIGHT... * Sky/weather.....................Clear. * Min Temperature.................77-84. * 24 hr trend..................4 degrees warmer. * Max Humidity....................22-53 pct. * 24 hr trend..................3 pct drier. * Winds - 20 foot...Slope/Valley..South 5 to 15 mph. * Winds...10000 FT MSL............South 5 to 15 mph in the evening becoming 15 to 25 mph after midnight. * Chance of Precip................0 percent. * CWR (>= 0.10 IN)................0 percent. * Chance of Thunder...............1 percent. .TUESDAY... * Sky/weather.....................Mostly sunny. * Max Temperature.................101-110. * 24 hr trend..................Little change. * Min Humidity....................11-16 pct. * 24 hr trend..................Little RH change. * Winds - 20 foot...Slope/Valley..Southeast 5 to 10 mph in the morning becoming south in the afternoon. * Winds...10000 FT MSL............South 15 to 25 mph. * Chance of Precip................0 percent. * CWR (>= 0.10 IN)................0 percent. * Chance of Thunder...............3 percent. .TUESDAY NIGHT... * Sky/weather.....................Mostly clear. * Min Temperature.................81-87. * 24 hr trend..................4 degrees warmer. * Max Humidity....................20-35 pct. * 24 hr trend..................8 pct drier. * Winds - 20 foot...Slope/Valley..Southwest 5 to 10 mph in the evening becoming northwest after midnight. * Winds...10000 FT MSL............South 10 to 20 mph. * Chance of Precip................0 percent. * CWR (>= 0.10 IN)................0 percent. * Chance of Thunder...............1 percent. .WEDNESDAY... * Sky/weather.....................Mostly sunny. * Max Temperature.................103-112. * 24 hr trend..................Little change. * Min Humidity....................11-17 pct. * 24 hr trend..................Little RH change. * Winds - 20 foot...Slope/Valley..Northwest 5 to 10 mph in the morning becoming south in the afternoon. * Winds...10000 FT MSL............South 10 to 20 mph. * Chance of Precip................0 percent. * CWR (>= 0.10 IN)................0 percent. * Chance of Thunder...............2 percent. .EXTENDED... .THURSDAY...Mostly clear. Lows 84-92. Highs 105-115. South winds 5 to 15 mph. .FRIDAY...Partly cloudy with slight chance of showers and thunderstorms. Lows 85-92. Highs 105-115. South winds 5 to 15 mph. .SATURDAY...Partly cloudy with slight chance of showers and thunderstorms. Lows 84-91. Highs 101-111. South winds 5 to 15 mph. .SUNDAY...Partly cloudy with slight chance of showers and thunderstorms. Lows 82-90. Highs 102-112. .MONDAY...Partly cloudy with slight chance of showers and thunderstorms. Lows 79-89. Highs 98-107. $$ CAZ230-190845- Joshua Tree National Park- 140 PM PDT Mon Aug 18 2025 .TONIGHT... * Sky/weather.....................Clear. * Min Temperature.................69-79. * 24 hr trend..................4 degrees warmer. * Max Humidity....................22-28 pct. * 24 hr trend..................5 pct drier. * Winds - 20 foot...Slope/Valley..Southwest 5 to 15 mph. * Winds...10000 FT MSL............South 10 to 20 mph. * Chance of Precip................0 percent. * CWR (>= 0.10 IN)................0 percent. * Chance of Thunder...............0 percent. .TUESDAY... * Sky/weather.....................Sunny. * Max Temperature.................91-104. * 24 hr trend..................Little change. * Min Humidity....................13-17 pct. * 24 hr trend..................Little RH change. * Winds - 20 foot...Slope/Valley..Northwest 5 to 10 mph in the morning becoming south in the afternoon. * Winds...10000 FT MSL............South 15 to 25 mph. * Chance of Precip................0 percent. * CWR (>= 0.10 IN)................0 percent. * Chance of Thunder...............4 percent. .TUESDAY NIGHT... * Sky/weather.....................Mostly clear. * Min Temperature.................72-82. * 24 hr trend..................3 degrees warmer. * Max Humidity....................23-27 pct. * 24 hr trend..................Little change. * Winds - 20 foot...Slope/Valley..West 5 to 15 mph. * Winds...10000 FT MSL............Light and variable in the evening becoming south 10 to 20 mph after midnight. * Chance of Precip................0 percent. * CWR (>= 0.10 IN)................0 percent. * Chance of Thunder...............0 percent. .WEDNESDAY... * Sky/weather.....................Mostly sunny. * Max Temperature.................92-107. * 24 hr trend..................Little change. * Min Humidity....................13-18 pct. * 24 hr trend..................Little RH change. * Winds - 20 foot...Slope/Valley..North 5 to 10 mph in the morning becoming south in the afternoon. * Winds...10000 FT MSL............South 5 to 15 mph in the morning becoming light and variable in the afternoon. * Chance of Precip................0 percent. * CWR (>= 0.10 IN)................0 percent. * Chance of Thunder...............2 percent. .EXTENDED... .THURSDAY...Mostly clear. Lows 75-87. Highs 95-109. Southwest winds 5 to 15 mph. .FRIDAY...Partly cloudy with chance of showers and slight chance of thunderstorms. Lows 76-87. Highs 96-109. Southwest winds 5 to 15 mph. .SATURDAY...Partly cloudy with slight chance of showers and thunderstorms. Lows 75-87. Highs 92-105. Southwest winds 5 to 15 mph. .SUNDAY...Partly cloudy with chance of showers and slight chance of thunderstorms. Lows 73-86. Highs 92-106. .MONDAY...Partly cloudy with chance of showers and slight chance of thunderstorms. Lows 70-84. Highs 89-102. $$ .8 TO 10 DAY OUTLOOK...Tuesday August 26th through Thursday August 28th: Above normal temperatures and above median precipitation.