FNUS55 KTWC 182154 FWFTWC Fire Weather Planning Forecast for Southeast Arizona National Weather Service Tucson AZ 254 PM MST Mon May 18 2026 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 20-FOOT WIND FORECAST OF 'LIGHT WINDS' INDICATES MAINLY TERRAIN DRIVEN WINDS +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ .DISCUSSION...Breezy to locally windy conditions (sustained winds 15-20 mph; gusts between 30-35 mph) combined with low relative humidity (as low as 13 to 18 percent) and dry fuels this afternoon will result in near critical fire weather conditions across eastern portions of Cochise County. Winds will taper off after sunset and RH will recover to between 40 and 50 percent overnight. Tomorrow and Wednesday, elevated fire weather conditions are forecast (especially for southeast portions of Cochise County) as breezy conditions (winds around 15 mph; gusts 25-30 mph) and minimum RH (between 10 to 15 percent) continue thru Friday afternoon. While confidence remains low, there is a slight chance (10-20%) for cloud buildups and virga over the weekend into early next week in the White Mountains and terrain over to the south and east of Tucson. Stay tuned. AZZ150-191415- Arizona Fire Weather Zone 150 Sonoran FDRA-Most of Pima County-South Central Pinal County- Tohono O'odham Nation-Tucson Metropolitan area-TDC- 254 PM MST Mon May 18 2026 .TONIGHT... * Sky/Weather..............Mostly clear (5-15 pct). * Chance of Precip.........0 pct. * Chance of Thunder........0 pct. * Min Temperature..........52 to 62 degs. 24 hr Trend...........Down 1 deg. * Max Humidity.............50 to 60 pct. 24 hr Trend...........Up 8 to 12 pct. * Wind (20 ft/10-min avg)..Southwest 10 to 15 mph. * 10000 ft MSL Wind........Southwest 20 to 25 mph. .TUESDAY... * Sky/Weather..............Mostly sunny (10-20 pct). * Chance of Precip.........0 pct. * Chance of Thunder........0 pct. * Max Temperature..........83 to 93 degs. 24 hr Trend...........Up 3 to 7 degs. * Min Humidity.............10 to 18 pct. 24 hr Trend...........Down 3 to 7 pct. * Wind (20 ft/10-min avg)..Southwest 10 to 15 mph. * 10000 ft MSL Wind........Southwest 15 to 20 mph. * Mixing height............10102 ft AGL. * Transport winds..........South 10 to 14 knots. * Ventilation Category.....Excellent (141428 knot-ft). .TUESDAY NIGHT... * Sky/Weather..............Partly cloudy (30-40 pct) then becoming mostly cloudy (50-60 pct). * Chance of Precip.........0 pct. * Chance of Thunder........0 pct. * Min Temperature..........56 to 66 degs. 24 hr Trend...........Up 2 to 5 degs. * Max Humidity.............33 to 43 pct. 24 hr Trend...........Down 11 to 15 pct. * Wind (20 ft/10-min avg)..Southwest around 15 mph in the evening becoming light. * 10000 ft MSL Wind........South 15 to 20 mph. .WEDNESDAY... * Sky/Weather..............Partly cloudy (40-50 pct). * Chance of Precip.........0 pct. * Chance of Thunder........0 pct. * Max Temperature..........84 to 94 degs. 24 hr Trend...........Up 1 to 4 degs. * Min Humidity.............6 to 16 pct. 24 hr Trend...........Down 1 to 4 pct. * Wind (20 ft/10-min avg)..South 10 to 15 mph. * 10000 ft MSL Wind........South 10 to 15 mph. * Mixing height............12646 ft AGL. * Transport winds..........South 10 to 15 knots. * Ventilation Category.....Excellent (189690 knot-ft). .Forecast days 3 through 7...... Winds in Days 3 through 5 are surface 20 ft/10-min avg .THURSDAY...Mostly clear. Lows 55 to 65. Highs 86 to 96. Southwest wind around 15 mph. Minimum Humidity 7 to 14 pct. .FRIDAY...Mostly clear. Lows 57 to 67. Highs 86 to 96. South wind around 15 mph. Minimum Humidity 9 to 17 pct. .SATURDAY...Mostly clear. Lows 57 to 67. Highs 86 to 96. Light winds. Minimum Humidity 12 to 20 pct. .SUNDAY...Mostly clear. Lows 59 to 69. Highs 89 to 99. .MEMORIAL DAY...Mostly clear. Lows 60 to 70. Highs 89 to 99. NOTE TO USERS - ZONE 150 VENTILATION CATEGORY...MIXING HEIGHT AND TRANSPORT WINDS ARE BASED ON THE TUCSON INTERNATIONAL AIRPORT LOCATION (2550 MSL) $$ AZZ151-191415- Arizona Fire Weather Zone 151 Western half Desert Grasslands FDRA including elevations up to 5500 feet in Southeast corner of Pinal County- Extreme Eastern Pima County-Western third of Cochise County- Santa Cruz County-TDC- 254 PM MST Mon May 18 2026 .TONIGHT... * Sky/Weather..............Mostly clear (5-15 pct). * Chance of Precip.........0 pct. * Chance of Thunder........0 pct. * Min Temperature..........47 to 57 degs. 24 hr Trend...........Down 1 to 4 degs. * Max Humidity.............47 to 57 pct. 24 hr Trend...........Up 7 to 11 pct. * Wind (20 ft/10-min avg)..Southwest around 20 mph becoming south around 10 mph after midnight. * 10000 ft MSL Wind........Southwest 25 to 30 mph. .TUESDAY... * Sky/Weather..............Mostly sunny (10-20 pct). * Chance of Precip.........0 pct. * Chance of Thunder........0 pct. * Max Temperature..........80 to 90 degs. 24 hr Trend...........Up 3 to 6 degs. * Min Humidity.............9 to 19 pct. 24 hr Trend...........Down 3 to 7 pct. * Wind (20 ft/10-min avg)..South 10 to 15 mph. * 10000 ft MSL Wind........Southwest 20 to 25 mph. * Mixing height............7556 ft AGL. * Transport winds..........South 16 to 22 knots. * Ventilation Category.....Excellent (166232 knot-ft). .TUESDAY NIGHT... * Sky/Weather..............Partly cloudy (30-40 pct). * Chance of Precip.........0 pct. * Chance of Thunder........0 pct. * Min Temperature..........51 to 61 degs. 24 hr Trend...........Up 3 to 6 degs. * Max Humidity.............31 to 41 pct. 24 hr Trend...........Down 15 to 19 pct. * Wind (20 ft/10-min avg)..Southwest around 15 mph in the evening becoming light. * 10000 ft MSL Wind........Southwest 20 to 25 mph. .WEDNESDAY... * Sky/Weather..............Mostly cloudy (50-60 pct). * Chance of Precip.........0 pct. * Chance of Thunder........0 pct. * Max Temperature..........80 to 90 degs. 24 hr Trend...........Little change. * Min Humidity.............7 to 14 pct. 24 hr Trend...........Down 3 to 7 pct. * Wind (20 ft/10-min avg)..South 10 to 15 mph. * 10000 ft MSL Wind........Southwest 15 to 20 mph. * Mixing height............9716 ft AGL. * Transport winds..........South 14 to 17 knots. * Ventilation Category.....Excellent (165172 knot-ft). .Forecast days 3 through 7...... Winds in Days 3 through 5 are surface 20 ft/10-min avg .THURSDAY...Mostly clear. Lows 50 to 60. Highs 80 to 90. Southwest wind around 15 mph. Minimum Humidity 9 to 18 pct. .FRIDAY...Mostly clear. Lows 51 to 61. Highs 80 to 90. Southwest wind around 15 mph. Minimum Humidity 10 to 20 pct. .SATURDAY...Mostly clear. Lows 52 to 62. Highs 80 to 90. Southwest wind around 15 mph. Minimum Humidity 15 to 25 pct. .SUNDAY...Mostly clear. Lows 53 to 63. Highs 83 to 93. .MEMORIAL DAY...Mostly clear. Lows 54 to 64. Highs 83 to 93. NOTE TO USERS - ZONE 151 VENTILATION CATEGORY...MIXING HEIGHT AND TRANSPORT WINDS ARE BASED ON THE BUENOS AIRES N.W.R. LOCATION (3500 MSL) $$ AZZ152-191415- Arizona Fire Weather Zone 152 Eastern half Desert Grasslands FDRA including elevations up to 5500 feet in Southwest Graham County and Eastern two thirds of Cochise County-Southern San Carlos Reservation- Southern Greenlee County below 5000 feet-TDC- 254 PM MST Mon May 18 2026 .TONIGHT... * Sky/Weather..............Mostly clear (5-15 pct). * Chance of Precip.........0 pct. * Chance of Thunder........0 pct. * Min Temperature..........48 to 58 degs. 24 hr Trend...........Down 1 to 4 degs. * Max Humidity.............43 to 53 pct. 24 hr Trend...........Up 6 to 10 pct. * Wind (20 ft/10-min avg)..West around 20 mph becoming southwest around 10 mph after midnight. * 10000 ft MSL Wind........Southwest 25 to 30 mph. .TUESDAY... * Sky/Weather..............Mostly sunny (5-15 pct). * Chance of Precip.........0 pct. * Chance of Thunder........0 pct. * Max Temperature..........81 to 91 degs. 24 hr Trend...........Up 3 to 6 degs. * Min Humidity.............9 to 19 pct. 24 hr Trend...........Down 4 to 8 pct. * Wind (20 ft/10-min avg)..South 15 to 20 mph. * 10000 ft MSL Wind........Southwest 20 to 25 mph. * Mixing height............9922 ft AGL. * Transport winds..........South 16 to 23 knots. * Ventilation Category.....Excellent (228206 knot-ft). .TUESDAY NIGHT... * Sky/Weather..............Partly cloudy (30-40 pct). * Chance of Precip.........0 pct. * Chance of Thunder........0 pct. * Min Temperature..........52 to 62 degs. 24 hr Trend...........Up 3 to 6 degs. * Max Humidity.............27 to 37 pct. 24 hr Trend...........Down 13 to 17 pct. * Wind (20 ft/10-min avg)..Southwest 10 to 15 mph. * 10000 ft MSL Wind........Southwest 20 to 25 mph. .WEDNESDAY... * Sky/Weather..............Mostly cloudy (50-60 pct). * Chance of Precip.........0 pct. * Chance of Thunder........0 pct. * Max Temperature..........80 to 90 degs. 24 hr Trend...........Down 1 to 4 degs. * Min Humidity.............6 to 14 pct. 24 hr Trend...........Up 1 pct. * Wind (20 ft/10-min avg)..South 10 to 15 mph. * 10000 ft MSL Wind........Southwest 15 to 20 mph. * Mixing height............12777 ft AGL. * Transport winds..........Southwest 13 to 18 knots. * Ventilation Category.....Excellent (229986 knot-ft). .Forecast days 3 through 7...... Winds in Days 3 through 5 are surface 20 ft/10-min avg .THURSDAY...Mostly clear. Lows 50 to 60. Highs 80 to 90. Southwest wind around 15 mph. Minimum Humidity 8 to 17 pct. .FRIDAY...Mostly clear. Lows 50 to 60. Highs 80 to 90. Southwest wind around 15 mph. Minimum Humidity 8 to 18 pct. .SATURDAY...Mostly clear. Lows 52 to 62. Highs 80 to 90. Light winds. Minimum Humidity 12 to 22 pct. .SUNDAY...Mostly clear. Lows 53 to 63. Highs 83 to 93. .MEMORIAL DAY...Mostly clear. Slight chance of showers and thunderstorms. Lows 55 to 65. Highs 84 to 94. NOTE TO USERS - ZONE 152 VENTILATION CATEGORY...MIXING HEIGHT AND TRANSPORT WINDS ARE BASED ON THE CHIRICAHUA N.M. LOCATION (5400 MSL) $$ AZZ153-191415- Arizona Fire Weather Zone 153 Northern Graham County-Northern Greenlee County- White and Gila Mountains-Apache Sitgreaves NF- Southern San Carlos Reservation above 5000 feet-SDC- 254 PM MST Mon May 18 2026 .TONIGHT... * Sky/Weather..............Mostly clear (5-15 pct). * Chance of Precip.........0 pct. * Chance of Thunder........0 pct. * Min Temperature..........42 to 52 degs. 24 hr Trend...........Down 1 deg. * Max Humidity.............55 to 65 pct. 24 hr Trend...........Up 11 to 15 pct. * Wind (20 ft/10-min avg)..West around 15 mph in the evening becoming light. * 10000 ft MSL Wind........Southwest 25 to 30 mph. .TUESDAY... * Sky/Weather..............Mostly sunny (5-15 pct). * Chance of Precip.........0 pct. * Chance of Thunder........0 pct. * Max Temperature..........69 to 79 degs. 24 hr Trend...........Up 1 to 4 degs. * Min Humidity.............11 to 21 pct. 24 hr Trend...........Down 1 pct. * Wind (20 ft/10-min avg)..South 10 to 15 mph. * 10000 ft MSL Wind........Southwest 15 to 20 mph. * Mixing height............8684 ft AGL. * Transport winds..........South 16 to 21 knots. * Ventilation Category.....Excellent (182364 knot-ft). .TUESDAY NIGHT... * Sky/Weather..............Partly cloudy (30-40 pct). * Chance of Precip.........0 pct. * Chance of Thunder........0 pct. * Min Temperature..........46 to 56 degs. 24 hr Trend...........Up 3 to 7 degs. * Max Humidity.............34 to 44 pct. 24 hr Trend...........Down 19 to 23 pct. * Wind (20 ft/10-min avg)..West around 15 mph in the evening becoming light. * 10000 ft MSL Wind........Southwest 20 to 25 mph. .WEDNESDAY... * Sky/Weather..............Mostly cloudy (55-65 pct). * Chance of Precip.........0 pct. * Chance of Thunder........0 pct. * Max Temperature..........69 to 79 degs. 24 hr Trend...........Little change. * Min Humidity.............7 to 15 pct. 24 hr Trend...........Down 3 to 7 pct. * Wind (20 ft/10-min avg)..Southeast around 10 mph shifting to the southwest in the afternoon. * 10000 ft MSL Wind........Southwest 10 to 15 mph. * Mixing height............10899 ft AGL. * Transport winds..........South 15 to 17 knots. * Ventilation Category.....Excellent (185283 knot-ft). .Forecast days 3 through 7...... Winds in Days 3 through 5 are surface 20 ft/10-min avg .THURSDAY...Mostly clear. Lows 43 to 53. Highs 70 to 80. West wind around 15 mph. Minimum Humidity 9 to 16 pct. .FRIDAY...Mostly clear. Lows 43 to 53. Highs 71 to 81. Light winds. Minimum Humidity 9 to 16 pct. .SATURDAY...Mostly clear. Lows 45 to 55. Highs 73 to 83. Light winds. Minimum Humidity 12 to 20 pct. .SUNDAY...Mostly clear. Lows 46 to 56. Highs 75 to 85. .MEMORIAL DAY...Partly cloudy. Slight chance of showers and thunderstorms. Lows 48 to 58. Highs 75 to 85. NOTE TO USERS - ZONE 153 VENTILATION CATEGORY...MIXING HEIGHT AND TRANSPORT WINDS ARE BASED ON THE POINT OF PINES LOCATION (6040 MSL) $$ AZZ154-191415- Arizona Fire Weather Zone 154 Forest Woodlands FDRA including the Sky Islands of Southeast Arizona above 5500 feet-Coronado NF-TDC- 254 PM MST Mon May 18 2026 .TONIGHT... * Sky/Weather..............Mostly clear (5-15 pct). * Chance of Precip.........0 pct. * Chance of Thunder........0 pct. * Min Temperature..........44 to 54 degs. 24 hr Trend...........Up 1 deg. * Max Humidity.............42 to 52 pct. 24 hr Trend...........Up 4 to 8 pct. * Wind (20 ft/10-min avg)..Southwest around 20 mph decreasing to around 10 mph after midnight. * 10000 ft MSL Wind........Southwest 25 to 30 mph. .TUESDAY... * Sky/Weather..............Mostly sunny (5-15 pct). * Chance of Precip.........0 pct. * Chance of Thunder........0 pct. * Max Temperature..........71 to 81 degs. 24 hr Trend...........Up 3 to 6 degs. * Min Humidity.............11 to 21 pct. 24 hr Trend...........Down 6 to 10 pct. * Wind (20 ft/10-min avg)..Southwest 10 to 15 mph. * 10000 ft MSL Wind........Southwest 20 to 25 mph. * Mixing height............10894 ft AGL. * Transport winds..........South 18 to 25 knots. * Ventilation Category.....Excellent (234221 knot-ft). .TUESDAY NIGHT... * Sky/Weather..............Partly cloudy (25-35 pct) then becoming mostly cloudy (45-55 pct). * Chance of Precip.........0 pct. * Chance of Thunder........0 pct. * Min Temperature..........49 to 59 degs. 24 hr Trend...........Up 2 to 5 degs. * Max Humidity.............25 to 35 pct. 24 hr Trend...........Down 13 to 17 pct. * Wind (20 ft/10-min avg)..Southwest 10 to 15 mph. * 10000 ft MSL Wind........Southwest 20 to 25 mph. .WEDNESDAY... * Sky/Weather..............Mostly cloudy (50-60 pct). * Chance of Precip.........0 pct. * Chance of Thunder........0 pct. * Max Temperature..........70 to 80 degs.24 hr Trend...........Down 1 deg. * Min Humidity.............8 to 18 pct. 24 hr Trend...........Up 1 to 4 pct. * Wind (20 ft/10-min avg)..Southwest 10 to 15 mph. * 10000 ft MSL Wind........Southwest 15 to 20 mph. * Mixing height............13636 ft AGL. * Transport winds..........Southwest 15 to 19 knots. * Ventilation Category.....Excellent (231812 knot-ft). .Forecast days 3 through 7...... Winds in Days 3 through 5 are surface 20 ft/10-min avg .THURSDAY...Mostly clear. Lows 47 to 57. Highs 70 to 80. Southwest wind around 15 mph. Minimum Humidity 11 to 21 pct. .FRIDAY...Mostly clear. Lows 48 to 58. Highs 70 to 80. Southwest wind around 15 mph. Minimum Humidity 12 to 22 pct. .SATURDAY...Mostly clear. Slight chance of showers and thunderstorms. Lows 49 to 59. Highs 71 to 81. Southwest wind around 15 mph. Minimum Humidity 18 to 28 pct. .SUNDAY...Mostly clear. Lows 50 to 60. Highs 74 to 84. .MEMORIAL DAY...Mostly clear. Slight chance of showers and thunderstorms. Lows 52 to 62. Highs 75 to 85. NOTE TO USERS - ZONE 154 VENTILATION CATEGORY...MIXING HEIGHT AND TRANSPORT WINDS ARE BASED ON THE AVERAGE ACROSS THE ZONE $$ Visit us on Facebook...Twitter...YouTube...and at weather.gov/Tucson