FNUS55 KTWC 180727 FWFTWC Fire Weather Planning Forecast for Southeast Arizona National Weather Service Tucson AZ 1227 AM MST Mon May 18 2026 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 20-FOOT WIND FORECAST OF 'LIGHT WINDS' INDICATES MAINLY TERRAIN DRIVEN WINDS +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ .DISCUSSION... 20-foot southwest winds remain elevated today with speeds of 15-20 mph with gusts up to 35 mph as a weather system exits the region. RH values will be above critical levels at most locations today in the upper teens (or higher), although portions of Cochise, Graham, and Greenlee Counties may see critical fire weather conditions for an hour or so this afternoon. Dry conditions the next 7 days with high temperatures on Monday 4 to 10 degrees below normal, then warming to near normal by Wednesday and remaining there into next weekend. Min RH values today will range from 10-15 percent from Tucson east to 20-25 percent west of Tucson. Min RH values Tuesday into next weekend 6-16 percent in the lower elevations and 8-20 percent in the mountains. AZZ150-182215- Arizona Fire Weather Zone 150 Sonoran FDRA-Most of Pima County-South Central Pinal County- Tohono O'odham Nation-Tucson Metropolitan area-TDC- 1227 AM MST Mon May 18 2026 .TODAY... * Sky/Weather..............Mostly sunny (20-30 pct). * Chance of Precip.........0 pct. * Chance of Thunder........0 pct. * Max Temperature..........79 to 89 degs. 24 hr Trend...........Down 3 to 7 degs. * Min Humidity.............17 to 27 pct. 24 hr Trend...........Up 5 to 9 pct. * Wind (20 ft/10-min avg)..Southwest 10 to 20 mph. * 10000 ft MSL Wind........Southwest 25 to 30 mph. * Mixing height............8884 ft AGL. * Transport winds..........Southwest 17 to 19 knots. * Ventilation Category.....Excellent (168796 knot-ft). .TONIGHT... * Sky/Weather..............Mostly clear (10-20 pct). * Chance of Precip.........0 pct. * Chance of Thunder........0 pct. * Min Temperature..........53 to 63 degs. 24 hr Trend...........Down 1 deg. * Max Humidity.............46 to 56 pct. 24 hr Trend...........Up 7 to 11 pct. * Wind (20 ft/10-min avg)..Southwest around 15 mph shifting to the south after midnight. * 10000 ft MSL Wind........Southwest 15 to 20 mph. .TUESDAY... * Sky/Weather..............Mostly sunny (15-25 pct). * Chance of Precip.........0 pct. * Chance of Thunder........0 pct. * Max Temperature..........84 to 94 degs. 24 hr Trend...........Up 3 to 7 degs. * Min Humidity.............10 to 17 pct. 24 hr Trend...........Down 3 to 7 pct. * Wind (20 ft/10-min avg)..South around 10 mph shifting to the southwest in the afternoon. * 10000 ft MSL Wind........Southwest 15 to 20 mph. * Mixing height............10204 ft AGL. * Transport winds..........South 9 to 13 knots. * Ventilation Category.....Excellent (132652 knot-ft). .Forecast days 3 through 7...... Winds in Days 3 through 5 are surface 20 ft/10-min avg .WEDNESDAY...Partly cloudy. Lows 57 to 67. Highs 85 to 95. Southwest wind around 15 mph. Minimum Humidity 6 to 15 pct. .THURSDAY...Clear. Lows 56 to 66. Highs 87 to 97. Southwest wind around 15 mph. Minimum Humidity 7 to 13 pct. .FRIDAY...Clear. Lows 58 to 68. Highs 87 to 97. South wind around 15 mph. Minimum Humidity 8 to 16 pct. .SATURDAY...Mostly clear. Lows 58 to 68. Highs 88 to 98. .SUNDAY...Mostly clear. Lows 59 to 69. 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) $$ AZZ151-182215- 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- 1227 AM MST Mon May 18 2026 .TODAY... * Sky/Weather..............Mostly sunny (5-15 pct). * Chance of Precip.........0 pct. * Chance of Thunder........0 pct. * Max Temperature..........76 to 86 degs. 24 hr Trend...........Down 1 to 4 degs. * Min Humidity.............16 to 26 pct. 24 hr Trend...........Up 8 to 12 pct. * Wind (20 ft/10-min avg)..Windy. South around 30 mph becoming southwest around 20 mph in the afternoon. * 10000 ft MSL Wind........Southwest around 40 mph decreasing to around 25 mph in the afternoon. * Mixing height............6627 ft AGL. * Transport winds..........Southwest 23 to 24 knots. * Ventilation Category.....Excellent (159048 knot-ft). .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 deg. * Max Humidity.............46 to 56 pct. 24 hr Trend...........Up 7 to 11 pct. * Wind (20 ft/10-min avg)..Southwest around 15 mph shifting to the south 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 7 degs. * Min Humidity.............9 to 18 pct. 24 hr Trend...........Down 5 to 9 pct. * Wind (20 ft/10-min avg)..South 10 to 15 mph. * 10000 ft MSL Wind........Southwest 20 to 25 mph. * Mixing height............7818 ft AGL. * Transport winds..........South 15 to 20 knots. * Ventilation Category.....Excellent (156360 knot-ft). .Forecast days 3 through 7...... Winds in Days 3 through 5 are surface 20 ft/10-min avg .WEDNESDAY...Mostly cloudy. Lows 52 to 62. Highs 80 to 90. Southwest wind around 15 mph. Minimum Humidity 7 to 13 pct. .THURSDAY...Mostly clear. Lows 51 to 61. Highs 81 to 91. Southwest wind around 15 mph. Minimum Humidity 8 to 15 pct. .FRIDAY...Clear. Lows 52 to 62. Highs 81 to 91. Southwest wind around 15 mph. Minimum Humidity 9 to 19 pct. .SATURDAY...Mostly clear. Lows 53 to 63. Highs 81 to 91. .SUNDAY...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) $$ AZZ152-182215- 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- 1227 AM MST Mon May 18 2026 .TODAY... * Sky/Weather..............Mostly sunny (20-30 pct). * Chance of Precip.........0 pct. * Chance of Thunder........0 pct. * Max Temperature..........77 to 87 degs. 24 hr Trend...........Down 1 to 4 degs. * Min Humidity.............14 to 24 pct. 24 hr Trend...........Up 3 to 6 pct. * Wind (20 ft/10-min avg)..Breezy. Southwest 15 to 25 mph. * 10000 ft MSL Wind........Southwest around 40 mph decreasing to around 25 mph in the afternoon. * Mixing height............7915 ft AGL. * Transport winds..........Southwest 25 knots. * Ventilation Category.....Excellent (197875 knot-ft). .TONIGHT... * Sky/Weather..............Mostly clear (10-20 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 12 to 16 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.............8 to 18 pct. 24 hr Trend...........Down 2 to 5 pct. * Wind (20 ft/10-min avg)..South 10 to 15 mph. * 10000 ft MSL Wind........Southwest 20 to 25 mph. * Mixing height............10703 ft AGL. * Transport winds..........South 15 to 22 knots. * Ventilation Category.....Excellent (235466 knot-ft). .Forecast days 3 through 7...... Winds in Days 3 through 5 are surface 20 ft/10-min avg .WEDNESDAY...Mostly cloudy. Lows 52 to 62. Highs 81 to 91. Southwest wind around 15 mph. Minimum Humidity 6 to 12 pct. .THURSDAY...Mostly clear. Lows 51 to 61. Highs 81 to 91. Southwest wind around 15 mph. Minimum Humidity 7 to 14 pct. .FRIDAY...Mostly clear. Lows 51 to 61. Highs 81 to 91. Southwest wind around 15 mph. Minimum Humidity 8 to 17 pct. .SATURDAY...Mostly clear. Lows 53 to 63. Highs 82 to 92. .SUNDAY...Mostly clear. Lows 54 to 64. Highs 83 to 93. NOTE TO USERS - ZONE 152 VENTILATION CATEGORY...MIXING HEIGHT AND TRANSPORT WINDS ARE BASED ON THE CHIRICAHUA N.M. LOCATION (5400 MSL) $$ AZZ153-182215- 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- 1227 AM MST Mon May 18 2026 .TODAY... * Sky/Weather..............Mostly sunny (15-25 pct). * Chance of Precip.........0 pct. * Chance of Thunder........0 pct. * Max Temperature..........65 to 75 degs. 24 hr Trend...........Down 1 to 4 degs. * Min Humidity.............15 to 25 pct. 24 hr Trend...........Up 4 to 8 pct. * Wind (20 ft/10-min avg)..Southwest 10 to 20 mph. * 10000 ft MSL Wind........Southwest 30 to 35 mph. * Mixing height............6440 ft AGL. * Transport winds..........Southwest 25 to 27 knots. * Ventilation Category.....Excellent (173880 knot-ft). .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.............52 to 62 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 20 to 25 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.............12 to 22 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 15 to 19 knots. * Ventilation Category.....Excellent (164996 knot-ft). .Forecast days 3 through 7...... Winds in Days 3 through 5 are surface 20 ft/10-min avg .WEDNESDAY...Mostly cloudy. Lows 46 to 56. Highs 70 to 80. West wind around 15 mph. Minimum Humidity 7 to 13 pct. .THURSDAY...Mostly clear. Lows 45 to 55. Highs 71 to 81. West wind around 15 mph. Minimum Humidity 8 to 14 pct. .FRIDAY...Mostly clear. Lows 44 to 54. Highs 73 to 83. West wind around 15 mph. Minimum Humidity 9 to 15 pct. .SATURDAY...Mostly clear. Lows 46 to 56. Highs 73 to 83. .SUNDAY...Mostly clear. Lows 47 to 57. Highs 75to 85. NOTE TO USERS - ZONE 153 VENTILATION CATEGORY...MIXING HEIGHT AND TRANSPORT WINDS ARE BASED ON THE POINT OF PINES LOCATION (6040 MSL) $$ AZZ154-182215- Arizona Fire Weather Zone 154 Forest Woodlands FDRA including the Sky Islands of Southeast Arizona above 5500 feet-Coronado NF-TDC- 1227 AM MST Mon May 18 2026 .TODAY... * Sky/Weather..............Mostly sunny (20-30 pct). * Chance of Precip.........0 pct. * Chance of Thunder........0 pct. * Max Temperature..........67 to 77 degs. 24 hr Trend...........Down 1 to 4 degs. * Min Humidity.............18 to 28 pct. 24 hr Trend...........Up 3 to 7 pct. * Wind (20 ft/10-min avg)..Windy. Southwest 20 to 30 mph. * 10000 ft MSL Wind........Southwest around 45 mph decreasing to around 30 mph in the afternoon. * Mixing height............8598 ft AGL. * Transport winds..........Southwest 27 to 28 knots. * Ventilation Category.....Excellent (236445 knot-ft). .TONIGHT... * Sky/Weather..............Mostly clear (5-15 pct). * Chance of Precip.........0 pct. * Chance of Thunder........0 pct. * Min Temperature..........45 to 55 degs. 24 hr Trend...........Down 1 deg. * Max Humidity.............41 to 51 pct. 24 hr Trend...........Up 12 to 16 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 7 degs. * Min Humidity.............11 to 21 pct. 24 hr Trend...........Down 5 to 9 pct. * Wind (20 ft/10-min avg)..South 10 to 15 mph. * 10000 ft MSL Wind........Southwest 20 to 25 mph. * Mixing height............11490 ft AGL. * Transport winds..........Southwest 17 to 23 knots. * Ventilation Category.....Excellent (229800 knot-ft). .Forecast days 3 through 7...... Winds in Days 3 through 5 are surface 20 ft/10-min avg .WEDNESDAY...Mostly cloudy. Lows 49 to 59. Highs 71 to 81. Southwest wind around 15 mph. Minimum Humidity 8 to 15 pct. .THURSDAY...Mostly clear. Lows 48 to 58. Highs 71 to 81. Southwest wind around 15 mph. Minimum Humidity 9 to 18 pct. .FRIDAY...Mostly clear. Lows 49 to 59. Highs 72 to 82. Southwest wind around 15 mph. Minimum Humidity 11 to 21 pct. .SATURDAY...Mostly clear. Lows 50 to 60. Highs 72 to 82. .SUNDAY...Mostly clear. Lows 51 to 61. Highs 74 to 84. 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