FNUS55 KPSR 192127 FWFPSR Fire Weather Planning Forecast for Southwest and South-Central Arizona and Southeast California National Weather Service Phoenix AZ 227 PM MST Tue May 19 2026 .DISCUSSION... There will be a slow day-to-day warming of temperatures, but overall high temperatures will remain near seasonal normals throughout this week. Very dry conditions will persist each day with minimum RH values bottoming out around 5-15% areawide. Overnight recoveries range from poor to fair, mostly around 20-45%. Seasonal wind patterns are expected each day, with afternoon upslope breezes up to 15-25 mph. There will be an increase in high clouds across the region and thickest across south-central AZ, which should limit mixing heights somewhat. Mixing heights will be higher tomorrow, above 10K ft, with thinner clouds and less coverage. ...Thunderstorms imply gusty winds... Note...Additional Fire Weather Forecast information can be found in the Area Forecast Discussion. See product PHXAFDPSR. AZZ132-201000- 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- 227 PM MST Tue May 19 2026 .TONIGHT... * Sky/weather.....................Partly cloudy. * Min Temperature.................56-66. * 24 hr trend..................3 degrees warmer. * Max Humidity....................13-32 pct. * 24 hr trend..................7 pct drier. * Winds - 20 foot...Slope/Valley..West 5 to 15 mph. * Winds...10000 FT MSL............Southwest 10 to 20 mph. * Chance of Precip................0 percent. * CWR (>= 0.10 IN)................0 percent. * Chance of Thunder...............0 percent. .WEDNESDAY... * Sky/weather.....................Sunny. * Max Temperature.................88-94. * 24 hr trend..................Little change. * Min Humidity....................5-10 pct. * 24 hr trend..................Little RH change. * Winds - 20 foot...Slope/Valley..Southwest 5 to 15 mph. * Winds...10000 FT MSL............Southwest 10 to 15 mph. * Chance of Precip................0 percent. * CWR (>= 0.10 IN)................0 percent. * Chance of Thunder...............0 percent. * Mixing Height for Phoenix.......11700 ft AGL. * Transport Wind for Phoenix......Southwest 8 knots. * Dispersion for Phoenix..........Very good. .WEDNESDAY NIGHT... * Sky/weather.....................Clear. * Min Temperature.................58-68. * 24 hr trend..................Little change. * Max Humidity....................20-36 pct. * 24 hr trend..................4 pct wetter. * Winds - 20 foot...Slope/Valley..Southwest 5 to 10 mph in the evening becoming southeast after midnight. * Winds...10000 FT MSL............West 5 to 15 mph in the evening becoming east after midnight. * Chance of Precip................0 percent. * CWR (>= 0.10 IN)................0 percent. * Chance of Thunder...............0 percent. .THURSDAY... * Sky/weather.....................Sunny. * Max Temperature.................90-96. * 24 hr trend..................Little change. * Min Humidity....................7-11 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............Light and variable. * Chance of Precip................0 percent. * CWR (>= 0.10 IN)................0 percent. * Chance of Thunder...............0 percent. * Mixing Height for Phoenix.......12600 ft AGL. * Transport Wind for Phoenix......Southwest 5 knots. * Dispersion for Phoenix..........Good. .EXTENDED... .FRIDAY...Clear. Lows 61-71. Highs 91-97. South winds 5 to 15 mph. Minimum relative humidity may be lower than 15 percent. .SATURDAY...Clear. Lows 62-72. Highs 92-97. Southwest winds 5 to 15 mph. .SUNDAY...Clear. Lows 63-73. Highs 94-100. Southwest winds 5 to 15 mph. Minimum relative humidity may be lower than 15 percent. .MONDAY...Mostly clear. Lows 65-75. Highs 95-101. .TUESDAY...Mostly clear. Lows 64-74. Highs 93-99. $$ AZZ131-CAZ231-201000- Yuma/Martinez Lake and Vicinity/Lower Colorado River Valley AZ- Lower Colorado River Valley CA- 227 PM MST Tue May 19 2026 /227 PM PDT Tue May 19 2026/ .TONIGHT... * Sky/weather.....................Partly cloudy in the evening becoming clear after midnight. * Min Temperature.................55-63. * 24 hr trend..................Little change. * Max Humidity....................14-36 pct. * 24 hr trend..................3 pct drier. * Winds - 20 foot...Slope/Valley..Northwest 5 to 15 mph. * Winds...10000 FT MSL............Northwest 15 to 25 mph. * Chance of Precip................0 percent. * CWR (>= 0.10 IN)................0 percent. * Chance of Thunder...............0 percent. .WEDNESDAY... * Sky/weather.....................Sunny. * Max Temperature.................91-96. * 24 hr trend..................3 degrees warmer. * Min Humidity....................4-8 pct. * 24 hr trend..................Little change. * 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. * Chance of Thunder...............0 percent. * Mixing Height for Yuma..........13100 ft AGL. * Transport Wind for Yuma.........West 7 knots. * Dispersion for Yuma.............Very good. .WEDNESDAY NIGHT... * Sky/weather.....................Clear. * Min Temperature.................58-64. * 24 hr trend..................Little change. * Max Humidity....................27-48 pct. * 24 hr trend..................12 pct wetter. * Winds - 20 foot...Slope/Valley..Southwest 5 to 10 mph in the evening becoming southeast after midnight. * Winds...10000 FT MSL............North 10 to 15 mph. * Chance of Precip................0 percent. * CWR (>= 0.10 IN)................0 percent. * Chance of Thunder...............0 percent. .THURSDAY... * Sky/weather.....................Sunny. * Max Temperature.................94-99. * 24 hr trend..................Little change. * Min Humidity....................7-11 pct. * 24 hr trend..................Little RH change. * Winds - 20 foot...Slope/Valley..South 5 to 15 mph. * Winds...10000 FT MSL............Light and variable. * Chance of Precip................0 percent. * CWR (>= 0.10 IN)................0 percent. * Chance of Thunder...............0 percent. * Mixing Height for Yuma..........11900 ft AGL. * Transport Wind for Yuma.........South 6 knots. * Dispersion for Yuma.............Very good. .EXTENDED... .FRIDAY...Clear. Lows 61-66. Highs 94-99. South winds 10 to 20 mph. Minimum relative humidity may be lower than 15 percent. .SATURDAY...Clear. Lows 62-67. Highs 94-99. South winds 10 to 20 mph. .SUNDAY...Clear. Lows 63-69. Highs 96-101. South winds 5 to 15 mph. Minimum relative humidity may be lower than 15 percent. .MONDAY...Clear. Lows 64-69. Highs 97-102. .TUESDAY...Clear. Lows 63-68. Highs 95-100. $$ AZZ133-201000- Southern Gila County/Tonto National Forest Foothills- Southern Tonto NF/West San Carlos BIA/South Portion Ft Apache BIA/ CAZ- 227 PM MST Tue May 19 2026 .TONIGHT... * Sky/weather.....................Partly cloudy. * Min Temperature.................49-63. * 24 hr trend..................4 degrees warmer. * Max Humidity....................23-41 pct. * 24 hr trend..................17 pct drier. * Winds - 20 foot...Slope/Valley..West 5 to 10 mph in the evening becoming mostly downslope/downvalley after midnight. * Winds...10000 FT MSL............Southwest 15 to 25 mph. * Chance of Precip................0 percent. * CWR (>= 0.10 IN)................0 percent. * Chance of Thunder...............0 percent. .WEDNESDAY... * Sky/weather.....................Partly sunny. * Max Temperature.................75-90. * 24 hr trend..................Little change. * Min Humidity....................10-15 pct. * 24 hr trend..................3 pct drier. * 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...............0 percent. .WEDNESDAY NIGHT... * Sky/weather.....................Mostly clear. * Min Temperature.................47-62. * 24 hr trend..................Little change. * Max Humidity....................22-34 pct. * 24 hr trend..................3 pct drier. * Winds - 20 foot...Slope/Valley..West 5 to 10 mph in the evening becoming mostly downslope/downvalley after midnight. * Winds...10000 FT MSL............Southwest 10 to 15 mph. * Chance of Precip................0 percent. * CWR (>= 0.10 IN)................0 percent. * Chance of Thunder...............0 percent. .THURSDAY... * Sky/weather.....................Sunny. * Max Temperature.................77-92. * 24 hr trend..................Little change. * Min Humidity....................8-12 pct. * 24 hr trend..................Little RH change. * Winds - 20 foot...Slope/Valley..South 5 to 10 mph in the morning becoming southwest 5 to 15 mph in the afternoon. * Winds...10000 FT MSL............Southwest 10 to 15 mph. * Chance of Precip................0 percent. * CWR (>= 0.10 IN)................0 percent. * Chance of Thunder...............0 percent. .EXTENDED... .FRIDAY...Clear. Lows 48-65. Highs 78-93. West winds 5 to 15 mph. Minimum relative humidity may be lower than 15 percent. .SATURDAY...Clear. Lows 50-67. Highs 80-94. West winds 5 to 15 mph. Minimum relative humidity may be lower than 15 percent. .SUNDAY...Clear. Lows 51-69. Highs 83-97. West winds 5 to 15 mph. Minimum relative humidity may be lower than 15 percent. .MONDAY...Mostly clear with slight chance of showers and thunderstorms. Lows 52-69. Highs 83-97. .TUESDAY...Mostly clear. Lows 51-68. Highs 81-95. $$ CAZ232-201000- Imperial County And Eastern Riverside County- 227 PM PDT Tue May 19 2026 .TONIGHT... * Sky/weather.....................Mostly clear. * Min Temperature.................60-68. * 24 hr trend..................Little change. * Max Humidity....................9-29 pct. * 24 hr trend..................4 pct drier. * Winds - 20 foot...Slope/Valley..Northwest 5 to 15 mph. * Winds...10000 FT MSL............North 10 to 20 mph. * Chance of Precip................0 percent. * CWR (>= 0.10 IN)................0 percent. * Chance of Thunder...............0 percent. .WEDNESDAY... * Sky/weather.....................Sunny. * Max Temperature.................87-96. * 24 hr trend..................4 degrees warmer. * Min Humidity....................4-8 pct. * 24 hr trend..................Little change. * Winds - 20 foot...Slope/Valley..Northwest 5 to 15 mph. * Winds...10000 FT MSL............North 10 to 20 mph. * Chance of Precip................0 percent. * CWR (>= 0.10 IN)................0 percent. * Chance of Thunder...............0 percent. .WEDNESDAY NIGHT... * Sky/weather.....................Clear. * Min Temperature.................61-70. * 24 hr trend..................Little change. * Max Humidity....................13-39 pct. * 24 hr trend..................7 pct wetter. * Winds - 20 foot...Slope/Valley..West 5 to 15 mph. * Winds...10000 FT MSL............Northeast 10 to 15 mph. * Chance of Precip................0 percent. * CWR (>= 0.10 IN)................0 percent. * Chance of Thunder...............0 percent. .THURSDAY... * Sky/weather.....................Sunny. * Max Temperature.................89-98. * 24 hr trend..................Little change. * Min Humidity....................5-9 pct. * 24 hr trend..................Little RH change. * Winds - 20 foot...Slope/Valley..Southeast 5 to 15 mph. * Winds...10000 FT MSL............Light and variable. * Chance of Precip................0 percent. * CWR (>= 0.10 IN)................0 percent. * Chance of Thunder...............0 percent. .EXTENDED... .FRIDAY...Clear. Lows 64-71. Highs 90-99. South winds 5 to 15 mph. Minimum relative humidity may be lower than 15 percent. .SATURDAY...Clear. Lows 64-71. Highs 90-99. South winds 10 to 20 mph. .SUNDAY...Clear. Lows 64-72. Highs 91-100. South winds 5 to 15 mph. Minimum relative humidity may be lower than 15 percent. .MONDAY...Clear. Lows 65-72. Highs 92-101. .TUESDAY...Clear. Lows 64-71. Highs 89-98. $$ CAZ230-201000- Joshua Tree National Park- 227 PM PDT Tue May 19 2026 .TONIGHT... * Sky/weather.....................Clear. * Min Temperature.................51-62. * 24 hr trend..................3 degrees warmer. * Max Humidity....................11-15 pct. * 24 hr trend..................4 pct drier. * Winds - 20 foot...Slope/Valley..Northwest 5 to 15 mph. * Winds...10000 FT MSL............North 10 to 20 mph. * Chance of Precip................0 percent. * CWR (>= 0.10 IN)................0 percent. * Chance of Thunder...............0 percent. .WEDNESDAY... * Sky/weather.....................Sunny. * Max Temperature.................77-89. * 24 hr trend..................5 degrees warmer. * Min Humidity....................4-8 pct. * 24 hr trend..................Little RH change. * Winds - 20 foot...Slope/Valley..North 5 to 15 mph. * Winds...10000 FT MSL............North 15 to 25 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...............0 percent. .WEDNESDAY NIGHT... * Sky/weather.....................Clear. * Min Temperature.................55-65. * 24 hr trend..................3 degrees warmer. * Max Humidity....................15-19 pct. * 24 hr trend..................4 pct wetter. * Winds - 20 foot...Slope/Valley..West 5 to 15 mph. * Winds...10000 FT MSL............North 5 to 15 mph. * Chance of Precip................0 percent. * CWR (>= 0.10 IN)................0 percent. * Chance of Thunder...............0 percent. .THURSDAY... * Sky/weather.....................Sunny. * Max Temperature.................80-93. * 24 hr trend..................4 degrees warmer. * Min Humidity....................6-10 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............Light and variable. * Chance of Precip................0 percent. * CWR (>= 0.10 IN)................0 percent. * Chance of Thunder...............0 percent. .EXTENDED... .FRIDAY...Clear. Lows 56-67. Highs 80-94. Southwest winds 10 to 20 mph. Minimum relative humidity may be lower than 15 percent. .SATURDAY...Clear. Lows 56-68. Highs 81-93. South winds 10 to 20 mph. .SUNDAY...Clear. Lows 57-69. Highs 82-95. Southwest winds 10 to 20 mph. Minimum relative humidity may be lower than 15 percent. .MONDAY...Clear. Lows 55-69. Highs 82-96. .TUESDAY...Clear. Lows 55-69. Highs 80-93. $$ .8 TO 10 DAY OUTLOOK...Wednesday May 28th through Friday May 30th: Above normal temperatures and near median precipitation.