324
FNUS55 KTWC 200810
FWFTWC
FIRE WEATHER PLANNING FORECAST FOR SOUTHEAST ARIZONA
NATIONAL WEATHER SERVICE TUCSON AZ
110 AM MST WED MAY 20 2026
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
20-FOOT WIND FORECAST OF 'LIGHT WINDS' INDICATES MAINLY
TERRAIN DRIVEN WINDS
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
DISCUSSION
DRY AND BREEZY CONDITIONS TODAY RESULTING IN ELEVATED FIRE
WEATHER CONDITIONS FOR AREAS EAST AND SOUTH OF TUCSON WITH
BRIEF LOCALLY NEAR CRITICAL CONDITIONS EXISTING IN THE
SOUTHEASTERN PORTION OF COCHISE COUNTY. FOR THURSDAY THROUGH
SUNDAY, WINDS WILL BE GENERALLY BE LESS THAN 15 MPH WITH MIN
RELATIVE HUMIDITIES SITTING IN THE TEENS TO THE MID-20S. MID TO
UPPER LEVEL MOISTURE WILL APPROACH AS EARLY AS THIS WEEKEND
SOUTH AND EAST OF TUCSON, BUT THE MORE IMPACTFUL MOISTURE WILL
LIKELY HOLD OFF UNTIL EARLY NEXT WEEK AS ANOTHER WEATHER SYSTEM
APPROACHES. THERE IS A 10 TO 30 PERCENT CHANCE OF SHOWERS AND
THUNDERSTORMS MONDAY FOR MUCH OF SOUTHEAST ARIZONA, AND THESE
CHANCES WILL TREND TOWARDS THE NEW MEXICO BORDER TUESDAY.
AZZ150-202215-
ARIZONA FIRE WEATHER ZONE 150
SONORAN FDRA-MOST OF PIMA COUNTY-SOUTH CENTRAL PINAL COUNTY-
TOHONO O'ODHAM NATION-TUCSON METROPOLITAN AREA-TDC-
110 AM MST WED MAY 20 2026
TODAY
* SKY/WEATHER..............PARTLY CLOUDY (35-45 PCT).
* CHANCE OF PRECIP.........0 PCT.
* CHANCE OF THUNDER........0 PCT.
* MAX TEMPERATURE..........84 TO 94 DEGS.
24 HR TREND...........UP 1 DEG.
* MIN HUMIDITY.............6 TO 14 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............11712 FT AGL.
* TRANSPORT WINDS..........SOUTHWEST 10 TO 16 KNOTS.
* VENTILATION CATEGORY.....EXCELLENT (187392 KNOT-FT).
TONIGHT
* SKY/WEATHER..............PARTLY CLOUDY (40-50 PCT).
* CHANCE OF PRECIP.........0 PCT.
* CHANCE OF THUNDER........0 PCT.
* MIN TEMPERATURE..........55 TO 65 DEGS.
24 HR TREND...........LITTLE CHANGE.
* MAX HUMIDITY.............25 TO 35 PCT.
24 HR TREND...........DOWN 8 TO 12 PCT.
* WIND (20 FT/10-MIN AVG)..SOUTHWEST AROUND 15 MPH SHIFTING TO THE
SOUTH AFTER MIDNIGHT.
* 10000 FT MSL WIND........SOUTHWEST 10 TO 15 MPH.
THURSDAY
* SKY/WEATHER..............MOSTLY SUNNY (0-10 PCT).
* CHANCE OF PRECIP.........0 PCT.
* CHANCE OF THUNDER........0 PCT.
* MAX TEMPERATURE..........86 TO 96 DEGS.
24 HR TREND...........UP 1 TO 4 DEGS.
* MIN HUMIDITY.............7 TO 14 PCT.
24 HR TREND...........DOWN 1 PCT.
* WIND (20 FT/10-MIN AVG)..SOUTH AROUND 10 MPH SHIFTING TO THE
SOUTHWEST IN THE AFTERNOON.
* 10000 FT MSL WIND........SOUTH 10 TO 15 MPH.
* MIXING HEIGHT............13454 FT AGL.
* TRANSPORT WINDS..........SOUTH 9 TO 12 KNOTS.
* VENTILATION CATEGORY.....EXCELLENT (161448 KNOT-FT).
FORECAST DAYS 3 THROUGH 7...
WINDS IN DAYS 3 THROUGH 5 ARE SURFACE 20 FT/10-MIN AVG
FRIDAY
CLEAR. LOWS 56 TO 66. HIGHS 86 TO 96. SOUTHWEST WIND
AROUND 15 MPH. MINIMUM HUMIDITY 8 TO 16 PCT.
SATURDAY
CLEAR. LOWS 58 TO 68. HIGHS 87 TO 97. SOUTHWEST WIND
AROUND 15 MPH. MINIMUM HUMIDITY 11 TO 19 PCT.
SUNDAY
CLEAR. LOWS 59 TO 69. HIGHS 90 TO 100. SOUTHWEST WIND
AROUND 15 MPH. MINIMUM HUMIDITY 11 TO 18 PCT.
MEMORIAL DAY
MOSTLY CLEAR. LOWS 61 TO 71. HIGHS 90 TO 100.
TUESDAY
CLEAR. LOWS 59 TO 69. HIGHS 88 TO 98.
NOTE TO USERS - ZONE 150 VENTILATION CATEGORY...MIXING HEIGHT AND
TRANSPORT WINDS ARE BASED ON THE TUCSON INTERNATIONAL AIRPORT
LOCATION (2550 MSL)
AZZ151-202215-
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-
110 AM MST WED MAY 20 2026
TODAY
* SKY/WEATHER..............MOSTLY CLOUDY (50-60 PCT).
* CHANCE OF PRECIP.........0 PCT.
* CHANCE OF THUNDER........0 PCT.
* MAX TEMPERATURE..........79 TO 89 DEGS.
24 HR TREND...........LITTLE CHANGE.
* MIN HUMIDITY.............8 TO 15 PCT.
24 HR TREND...........DOWN 3 TO 7 PCT.
* WIND (20 FT/10-MIN AVG)..SOUTH AROUND 15 MPH SHIFTING TO THE
SOUTHWEST IN THE AFTERNOON.
* 10000 FT MSL WIND........SOUTHWEST 20 TO 25 MPH.
* MIXING HEIGHT............9061 FT AGL.
* TRANSPORT WINDS..........SOUTH 17 TO 20 KNOTS.
* VENTILATION CATEGORY.....EXCELLENT (181220 KNOT-FT).
TONIGHT
* SKY/WEATHER..............MOSTLY CLOUDY (50-60 PCT) THEN BECOMING
PARTLY CLOUDY (35-45 PCT).
* CHANCE OF PRECIP.........0 PCT.
* CHANCE OF THUNDER........0 PCT.
* MIN TEMPERATURE..........50 TO 60 DEGS.
24 HR TREND...........LITTLE CHANGE.
* MAX HUMIDITY.............31 TO 41 PCT.
24 HR TREND...........UP 4 TO 8 PCT.
* WIND (20 FT/10-MIN AVG)..WEST AROUND 15 MPH SHIFTING TO THE SOUTH
AFTER MIDNIGHT.
* 10000 FT MSL WIND........SOUTHWEST 15 TO 20 MPH.
THURSDAY
* SKY/WEATHER..............MOSTLY SUNNY (5-15 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.............9 TO 17 PCT.
24 HR TREND...........UP 1 TO 4 PCT.
* WIND (20 FT/10-MIN AVG)..SOUTH AROUND 10 MPH SHIFTING TO THE
SOUTHWEST IN THE AFTERNOON.
* 10000 FT MSL WIND........SOUTHWEST 10 TO 15 MPH.
* MIXING HEIGHT............10771 FT AGL.
* TRANSPORT WINDS..........SOUTH 13 TO 15 KNOTS.
* VENTILATION CATEGORY.....EXCELLENT (161565 KNOT-FT).
FORECAST DAYS 3 THROUGH 7...
WINDS IN DAYS 3 THROUGH 5 ARE SURFACE 20 FT/10-MIN AVG
FRIDAY
MOSTLY CLEAR. LOWS 50 TO 60. HIGHS 80 TO 90. SOUTHWEST
WIND AROUND 15 MPH. MINIMUM HUMIDITY 9 TO 17 PCT.
SATURDAY
MOSTLY CLEAR. LOWS 52 TO 62. HIGHS 81 TO 91.
SOUTHWEST WIND AROUND 15 MPH. MINIMUM HUMIDITY 12 TO 22 PCT.
SUNDAY
MOSTLY CLEAR. LOWS 53 TO 63. HIGHS 84 TO 94. LIGHT
WINDS. MINIMUM HUMIDITY 11 TO 21 PCT.
MEMORIAL DAY
PARTLY CLOUDY. SLIGHT CHANCE OF SHOWERS AND
THUNDERSTORMS. LOWS 55 TO 65. HIGHS 84 TO 94.
TUESDAY
MOSTLY CLEAR. LOWS 53 TO 63. HIGHS 82 TO 92.
NOTE TO USERS - ZONE 151 VENTILATION CATEGORY...MIXING HEIGHT AND
TRANSPORT WINDS ARE BASED ON THE BUENOS AIRES N.W.R. LOCATION
(3500 MSL)
AZZ152-202215-
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-
110 AM MST WED MAY 20 2026
TODAY
* SKY/WEATHER..............MOSTLY CLOUDY (55-65 PCT) THEN BECOMING
PARTLY CLOUDY (40-50 PCT).
* CHANCE OF PRECIP.........0 PCT.
* CHANCE OF THUNDER........0 PCT.
* MAX TEMPERATURE..........80 TO 90 DEGS.
24 HR TREND...........DOWN 1 DEG.
* MIN HUMIDITY.............6 TO 15 PCT.
24 HR TREND...........DOWN 1 TO 4 PCT.
* WIND (20 FT/10-MIN AVG)..SOUTH AROUND 15 MPH SHIFTING TO THE
SOUTHWEST IN THE AFTERNOON.
* 10000 FT MSL WIND........SOUTHWEST 20 TO 25 MPH.
* MIXING HEIGHT............11254 FT AGL.
* TRANSPORT WINDS..........SOUTH 17 TO 21 KNOTS.
* VENTILATION CATEGORY.....EXCELLENT (236334 KNOT-FT).
TONIGHT
* SKY/WEATHER..............MOSTLY CLOUDY (50-60 PCT) THEN BECOMING
PARTLY CLOUDY (40-50 PCT).
* CHANCE OF PRECIP.........0 PCT.
* CHANCE OF THUNDER........0 PCT.
* MIN TEMPERATURE..........51 TO 61 DEGS.
24 HR TREND...........DOWN 1 DEG.
* MAX HUMIDITY.............30 TO 40 PCT.
24 HR TREND...........DOWN 4 TO 8 PCT.
* WIND (20 FT/10-MIN AVG)..WEST 10 TO 15 MPH.
* 10000 FT MSL WIND........SOUTHWEST 15 TO 20 MPH.
THURSDAY
* SKY/WEATHER..............PARTLY CLOUDY (35-45 PCT) THEN BECOMING
MOSTLY SUNNY (10-20 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 16 PCT.
24 HR TREND...........UP 3 TO 6 PCT.
* WIND (20 FT/10-MIN AVG)..SOUTHWEST 10 TO 15 MPH.
* 10000 FT MSL WIND........SOUTHWEST 10 TO 15 MPH.
* MIXING HEIGHT............11959 FT AGL.
* TRANSPORT WINDS..........SOUTHWEST 14 TO 18 KNOTS.
* VENTILATION CATEGORY.....EXCELLENT (215262 KNOT-FT).
FORECAST DAYS 3 THROUGH 7...
WINDS IN DAYS 3 THROUGH 5 ARE SURFACE 20 FT/10-MIN AVG
FRIDAY
MOSTLY CLEAR. LOWS 51 TO 61. HIGHS 80 TO 90. SOUTHWEST
WIND AROUND 15 MPH. MINIMUM HUMIDITY 7 TO 15 PCT.
SATURDAY
MOSTLY CLEAR. LOWS 52 TO 62. HIGHS 81 TO 91. WEST
WIND AROUND 15 MPH. MINIMUM HUMIDITY 9 TO 19 PCT.
SUNDAY
MOSTLY CLEAR. LOWS 53 TO 63. HIGHS 85 TO 95. WEST WIND
AROUND 15 MPH. MINIMUM HUMIDITY 8 TO 18 PCT.
MEMORIAL DAY
PARTLY CLOUDY. SLIGHT CHANCE OF SHOWERS AND
THUNDERSTORMS. LOWS 55 TO 65. HIGHS 85 TO 95.
TUESDAY
MOSTLY CLEAR. LOWS 53 TO 63. HIGHS 82 TO 92.
NOTE TO USERS - ZONE 152 VENTILATION CATEGORY...MIXING HEIGHT AND
TRANSPORT WINDS ARE BASED ON THE CHIRICAHUA N.M. LOCATION (5400 MSL)
AZZ153-202215-
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-
110 AM MST WED MAY 20 2026
TODAY
* SKY/WEATHER..............MOSTLY CLOUDY (60-70 PCT) THEN BECOMING
PARTLY CLOUDY (45-55 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)..SOUTH 10 TO 15 MPH.
* 10000 FT MSL WIND........SOUTHWEST 15 TO 20 MPH.
* MIXING HEIGHT............9824 FT AGL.
* TRANSPORT WINDS..........SOUTH 17 TO 20 KNOTS.
* VENTILATION CATEGORY.....EXCELLENT (196480 KNOT-FT).
TONIGHT
* SKY/WEATHER..............MOSTLY CLOUDY (45-55 PCT).
* CHANCE OF PRECIP.........0 PCT.
* CHANCE OF THUNDER........0 PCT.
* MIN TEMPERATURE..........45 TO 55 DEGS.
24 HR TREND...........DOWN 1 TO 4 DEGS.
* MAX HUMIDITY.............28 TO 38 PCT.
24 HR TREND...........DOWN 7 TO 11 PCT.
* WIND (20 FT/10-MIN AVG)..NORTHWEST 10 TO 15 MPH.
* 10000 FT MSL WIND........WEST 15 TO 20 MPH.
THURSDAY
* SKY/WEATHER..............PARTLY CLOUDY (30-40 PCT) THEN BECOMING
MOSTLY SUNNY (0-10 PCT).
* CHANCE OF PRECIP.........0 PCT.
* CHANCE OF THUNDER........0 PCT.
* MAX TEMPERATURE..........70 TO 80 DEGS.
24 HR TREND...........LITTLE CHANGE.
* MIN HUMIDITY.............8 TO 14 PCT.
24 HR TREND...........UP 1 PCT.
* WIND (20 FT/10-MIN AVG)..SOUTHWEST 10 TO 15 MPH.
* 10000 FT MSL WIND........SOUTHWEST 10 TO 15 MPH.
* MIXING HEIGHT............10534 FT AGL.
* TRANSPORT WINDS..........SOUTHWEST 13 TO 16 KNOTS.
* VENTILATION CATEGORY.....EXCELLENT (168544 KNOT-FT).
FORECAST DAYS 3 THROUGH 7...
WINDS IN DAYS 3 THROUGH 5 ARE SURFACE 20 FT/10-MIN AVG
FRIDAY
MOSTLY CLEAR. LOWS 43 TO 53. HIGHS 71 TO 81. WEST WIND
AROUND 15 MPH. MINIMUM HUMIDITY 7 TO 12 PCT.
SATURDAY
MOSTLY CLEAR. LOWS 46 TO 56. HIGHS 72 TO 82. LIGHT
WINDS. MINIMUM HUMIDITY 10 TO 16 PCT.
SUNDAY
MOSTLY CLEAR. LOWS 47 TO 57. HIGHS 76 TO 86. LIGHT
WINDS. MINIMUM HUMIDITY 10 TO 16 PCT.
MEMORIAL DAY
PARTLY CLOUDY. CHANCE OF SHOWERS AND SLIGHT
CHANCE OF THUNDERSTORMS. LOWS 49 TO 59. HIGHS 75 TO 85.
TUESDAY
PARTLY CLOUDY. SLIGHT CHANCE OF SHOWERS AND
THUNDERSTORMS. LOWS 47 TO 57. HIGHS 72 TO 82.
NOTE TO USERS - ZONE 153 VENTILATION CATEGORY...MIXING HEIGHT AND
TRANSPORT WINDS ARE BASED ON THE POINT OF PINES LOCATION (6040 MSL)
AZZ154-202215-
ARIZONA FIRE WEATHER ZONE 154
FOREST WOODLANDS FDRA INCLUDING THE SKY ISLANDS OF SOUTHEAST
ARIZONA ABOVE 5500 FEET-CORONADO NF-TDC-
110 AM MST WED MAY 20 2026
TODAY
* 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...........LITTLE CHANGE.
* 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 20 TO 25 MPH.
* MIXING HEIGHT............12054 FT AGL.
* TRANSPORT WINDS..........SOUTHWEST 19 TO 22 KNOTS.
* VENTILATION CATEGORY.....EXCELLENT (247107 KNOT-FT).
TONIGHT
* SKY/WEATHER..............MOSTLY CLOUDY (50-60 PCT) THEN BECOMING
PARTLY CLOUDY (45-55 PCT).
* CHANCE OF PRECIP.........0 PCT.
* CHANCE OF THUNDER........0 PCT.
* MIN TEMPERATURE..........48 TO 58 DEGS.
24 HR TREND...........LITTLE CHANGE.
* MAX HUMIDITY.............29 TO 39 PCT.
24 HR TREND...........DOWN 3 TO 6 PCT.
* WIND (20 FT/10-MIN AVG)..WEST 10 TO 15 MPH.
* 10000 FT MSL WIND........SOUTHWEST 15 TO 20 MPH.
THURSDAY
* SKY/WEATHER..............PARTLY CLOUDY (35-45 PCT) THEN BECOMING
MOSTLY SUNNY (5-15 PCT).
* CHANCE OF PRECIP.........0 PCT.
* CHANCE OF THUNDER........0 PCT.
* MAX TEMPERATURE..........70 TO 80 DEGS.
24 HR TREND...........DOWN 1 TO 4 DEGS.
* MIN HUMIDITY.............11 TO 21 PCT.
24 HR TREND...........UP 2 TO 5 PCT.
* WIND (20 FT/10-MIN AVG)..SOUTHWEST 10 TO 15 MPH.
* 10000 FT MSL WIND........SOUTHWEST 10 TO 15 MPH.
* MIXING HEIGHT............12824 FT AGL.
* TRANSPORT WINDS..........SOUTHWEST 16 TO 18 KNOTS.
* VENTILATION CATEGORY.....EXCELLENT (218008 KNOT-FT).
FORECAST DAYS 3 THROUGH 7...
WINDS IN DAYS 3 THROUGH 5 ARE SURFACE 20 FT/10-MIN AVG
FRIDAY
MOSTLY CLEAR. LOWS 48 TO 58. HIGHS 70 TO 80. SOUTHWEST
WIND AROUND 15 MPH. MINIMUM HUMIDITY 10 TO 19 PCT.
SATURDAY
MOSTLY CLEAR. LOWS 49 TO 59. HIGHS 71 TO 81.
SOUTHWEST WIND AROUND 15 MPH. MINIMUM HUMIDITY 14 TO 24 PCT.
SUNDAY
MOSTLY CLEAR. LOWS 50 TO 60. HIGHS 76 TO 86. WEST WIND
AROUND 15 MPH. MINIMUM HUMIDITY 13 TO 23 PCT.
MEMORIAL DAY
PARTLY CLOUDY. SLIGHT CHANCE OF SHOWERS AND
THUNDERSTORMS. LOWS 53 TO 63. HIGHS 75 TO 85.
TUESDAY
MOSTLY CLEAR. LOWS 50 TO 60. HIGHS 73 TO 83.
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
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page