909
FNUS55 KTWC 182010
FWFTWC
FIRE WEATHER PLANNING FORECAST FOR SOUTHEAST ARIZONA
NATIONAL WEATHER SERVICE TUCSON AZ
110 PM MST THU DEC 18 2025
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
20-FOOT WIND FORECAST OF 'LIGHT WINDS' INDICATES MAINLY
TERRAIN DRIVEN WINDS
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
DISCUSSION
WARM AND DRY CONDITIONS CONTINUE INTO EARLY NEXT
WEEK. HIGHS 11 TO 14 DEGREES ABOVE NORMAL TODAY, THEN 15-19
DEGREES ABOVE NORMAL FRIDAY THROUGH MONDAY. MINIMUM RELATIVE
HUMIDITY VALUES OF 12-22 PERCENT EACH DAY THROUGH EARLY NEXT WEEK.
20-FOOT WINDS LESS THAN 15 MPH AND TERRAIN DRIVEN. A PACIFIC
SYSTEM APPROACHES MID-WEEK NEXT WEEK, INCREASING HUMIDITY VALUES
TO 25- 40 PERCENT AND BRING SLIGHT CHANCES FOR LIGHT
PRECIPITATION.
AZZ150-182315-
ARIZONA FIRE WEATHER ZONE 150
SONORAN FDRA-MOST OF PIMA COUNTY-SOUTH CENTRAL PINAL COUNTY-
TOHONO O'ODHAM NATION-TUCSON METROPOLITAN AREA-TDC-
110 PM MST THU DEC 18 2025
TODAY
* SKY/WEATHER..............MOSTLY SUNNY (0-10 PCT) THEN BECOMING
PARTLY CLOUDY (20-30 PCT).
* CHANCE OF PRECIP.........0 PCT.
* CHANCE OF THUNDER........0 PCT.
* MAX TEMPERATURE..........71 TO 81 DEGS.
24 HR TREND...........LITTLE CHANGE.
* MIN HUMIDITY.............16 TO 26 PCT.
24 HR TREND...........UP 3 TO 7 PCT.
* WIND (20 FT/10-MIN AVG)..LIGHT WINDS.
* 10000 FT MSL WIND........NORTH 25 TO 30 MPH.
* MIXING HEIGHT............2913 FT AGL.
* TRANSPORT WINDS..........EAST 7 KNOTS SHIFTING TO THE NORTH IN
THE AFTERNOON.
* VENTILATION CATEGORY.....FAIR (20391 KNOT-FT).
TONIGHT
* SKY/WEATHER..............MOSTLY CLEAR (20-30 PCT).
* CHANCE OF PRECIP.........0 PCT.
* CHANCE OF THUNDER........0 PCT.
* MIN TEMPERATURE..........46 TO 56 DEGS.
24 HR TREND...........UP 1 TO 4 DEGS.
* MAX HUMIDITY.............43 TO 53 PCT.
24 HR TREND...........LITTLE CHANGE.
* WIND (20 FT/10-MIN AVG)..LIGHT WINDS BECOMING EAST AROUND 10 MPH
AFTER MIDNIGHT.
* 10000 FT MSL WIND........NORTH 20 TO 25 MPH.
FRIDAY
* SKY/WEATHER..............MOSTLY SUNNY (10-20 PCT).
* CHANCE OF PRECIP.........0 PCT.
* CHANCE OF THUNDER........0 PCT.
* MAX TEMPERATURE..........76 TO 86 DEGS.
24 HR TREND...........UP 3 TO 6 DEGS.
* MIN HUMIDITY.............13 TO 23 PCT.
24 HR TREND...........DOWN 3 TO 6 PCT.
* WIND (20 FT/10-MIN AVG)..EAST AROUND 10 MPH IN THE MORNING
BECOMING LIGHT.
* 10000 FT MSL WIND........WEST 20 TO 25 MPH.
* MIXING HEIGHT............3435 FT AGL.
* TRANSPORT WINDS..........SOUTHEAST 8 KNOTS SHIFTING TO THE
SOUTHWEST 9 KNOTS IN THE AFTERNOON.
* VENTILATION CATEGORY.....FAIR (30915 KNOT-FT).
FORECAST DAYS 3 THROUGH 7...
WINDS IN DAYS 3 THROUGH 5 ARE SURFACE 20 FT/10-MIN AVG
SATURDAY
MOSTLY CLEAR. LOWS 45 TO 55. HIGHS 74 TO 84. LIGHT
WINDS. MINIMUM HUMIDITY 15 TO 25 PCT.
SUNDAY
CLEAR. LOWS 46 TO 56. HIGHS 75 TO 85. LIGHT WINDS.
MINIMUM HUMIDITY 13 TO 23 PCT.
MONDAY
MOSTLY CLEAR. LOWS 46 TO 56. HIGHS 77 TO 87. LIGHT
WINDS. MINIMUM HUMIDITY 11 TO 21 PCT.
TUESDAY
MOSTLY CLOUDY. SLIGHT CHANCE OF SHOWERS. LOWS 49 TO
59. HIGHS 71 TO 81.
WEDNESDAY
PARTLY CLOUDY. SLIGHT CHANCE OF SHOWERS. LOWS 48 TO
58. HIGHS 71 TO 81.
NOTE TO USERS - ZONE 150 VENTILATION CATEGORY...MIXING HEIGHT AND
TRANSPORT WINDS ARE BASED ON THE TUCSON INTERNATIONAL AIRPORT
LOCATION (2550 MSL)
AZZ151-182315-
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 PM MST THU DEC 18 2025
TODAY
* SKY/WEATHER..............MOSTLY SUNNY (20-30 PCT).
* CHANCE OF PRECIP.........0 PCT.
* CHANCE OF THUNDER........0 PCT.
* MAX TEMPERATURE..........69 TO 79 DEGS.
24 HR TREND...........LITTLE CHANGE.
* MIN HUMIDITY.............16 TO 26 PCT.
24 HR TREND...........UP 3 TO 6 PCT.
* WIND (20 FT/10-MIN AVG)..LIGHT WINDS.
* 10000 FT MSL WIND........NORTHWEST 25 TO 30 MPH.
* MIXING HEIGHT............3202 FT AGL.
* TRANSPORT WINDS..........NORTH 6 TO 7 KNOTS.
* VENTILATION CATEGORY.....FAIR (22414 KNOT-FT).
TONIGHT
* SKY/WEATHER..............MOSTLY CLEAR (15-25 PCT).
* CHANCE OF PRECIP.........0 PCT.
* CHANCE OF THUNDER........0 PCT.
* MIN TEMPERATURE..........42 TO 52 DEGS.
24 HR TREND...........UP 1 TO 4 DEGS.
* MAX HUMIDITY.............41 TO 51 PCT.
24 HR TREND...........DOWN 4 TO 8 PCT.
* WIND (20 FT/10-MIN AVG)..LIGHT WINDS BECOMING EAST AROUND 10 MPH
AFTER MIDNIGHT.
* 10000 FT MSL WIND........NORTH 15 TO 20 MPH.
FRIDAY
* SKY/WEATHER..............MOSTLY SUNNY (15-25 PCT).
* CHANCE OF PRECIP.........0 PCT.
* CHANCE OF THUNDER........0 PCT.
* MAX TEMPERATURE..........73 TO 83 DEGS.
24 HR TREND...........UP 3 TO 6 DEGS.
* MIN HUMIDITY.............12 TO 22 PCT.
24 HR TREND...........DOWN 2 TO 5 PCT.
* WIND (20 FT/10-MIN AVG)..SOUTHEAST AROUND 10 MPH SHIFTING TO THE
SOUTHWEST IN THE AFTERNOON.
* 10000 FT MSL WIND........NORTHWEST 20 TO 25 MPH.
* MIXING HEIGHT............4251 FT AGL.
* TRANSPORT WINDS..........SOUTHEAST 7 KNOTS SHIFTING TO THE
SOUTHWEST IN THE AFTERNOON.
* VENTILATION CATEGORY.....GOOD (51012 KNOT-FT).
FORECAST DAYS 3 THROUGH 7...
WINDS IN DAYS 3 THROUGH 5 ARE SURFACE 20 FT/10-MIN AVG
SATURDAY
MOSTLY CLEAR. LOWS 42 TO 52. HIGHS 71 TO 81. LIGHT
WINDS. MINIMUM HUMIDITY 13 TO 23 PCT.
SUNDAY
CLEAR. LOWS 42 TO 52. HIGHS 72 TO 82. LIGHT WINDS.
MINIMUM HUMIDITY 12 TO 22 PCT.
MONDAY
MOSTLY CLEAR. LOWS 42 TO 52. HIGHS 74 TO 84. LIGHT
WINDS. MINIMUM HUMIDITY 10 TO 19 PCT.
TUESDAY
MOSTLY CLOUDY. SLIGHT CHANCE OF SHOWERS. LOWS 44 TO
54. HIGHS 69 TO 79.
WEDNESDAY
PARTLY CLOUDY. SLIGHT CHANCE OF SHOWERS. LOWS 43 TO
53. HIGHS 68 TO 78.
NOTE TO USERS - ZONE 151 VENTILATION CATEGORY...MIXING HEIGHT AND
TRANSPORT WINDS ARE BASED ON THE BUENOS AIRES N.W.R. LOCATION
(3500 MSL)
AZZ152-182315-
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 PM MST THU DEC 18 2025
TODAY
* SKY/WEATHER..............MOSTLY SUNNY (15-25 PCT).
* CHANCE OF PRECIP.........0 PCT.
* CHANCE OF THUNDER........0 PCT.
* MAX TEMPERATURE..........66 TO 76 DEGS.
24 HR TREND...........UP 1 DEG.
* MIN HUMIDITY.............16 TO 25 PCT.
24 HR TREND...........UP 1 TO 4 PCT.
* WIND (20 FT/10-MIN AVG)..LIGHT WINDS.
* 10000 FT MSL WIND........NORTHWEST AROUND 30 MPH DECREASING TO
AROUND 20 MPH IN THE AFTERNOON.
* MIXING HEIGHT............3510 FT AGL.
* TRANSPORT WINDS..........NORTHWEST 7 TO 8 KNOTS.
* VENTILATION CATEGORY.....FAIR (28080 KNOT-FT).
TONIGHT
* SKY/WEATHER..............MOSTLY CLEAR (15-25 PCT).
* CHANCE OF PRECIP.........0 PCT.
* CHANCE OF THUNDER........0 PCT.
* MIN TEMPERATURE..........38 TO 48 DEGS.
24 HR TREND...........UP 1 DEG.
* MAX HUMIDITY.............46 TO 56 PCT.
24 HR TREND...........DOWN 2 TO 5 PCT.
* WIND (20 FT/10-MIN AVG)..LIGHT WINDS.
* 10000 FT MSL WIND........NORTHWEST 15 TO 20 MPH.
FRIDAY
* SKY/WEATHER..............MOSTLY SUNNY (15-25 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.............15 TO 25 PCT.
24 HR TREND...........LITTLE CHANGE.
* WIND (20 FT/10-MIN AVG)..LIGHT WINDS.
* 10000 FT MSL WIND........NORTHWEST 20 TO 25 MPH.
* MIXING HEIGHT............3510 FT AGL.
* TRANSPORT WINDS..........SOUTHEAST 6 KNOTS SHIFTING TO THE
SOUTHWEST 12 KNOTS IN THE AFTERNOON.
* VENTILATION CATEGORY.....GOOD (42120 KNOT-FT).
FORECAST DAYS 3 THROUGH 7...
WINDS IN DAYS 3 THROUGH 5 ARE SURFACE 20 FT/10-MIN AVG
SATURDAY
MOSTLY CLEAR. LOWS 38 TO 48. HIGHS 68 TO 78. LIGHT
WINDS. MINIMUM HUMIDITY 14 TO 23 PCT.
SUNDAY
CLEAR. LOWS 38 TO 48. HIGHS 68 TO 78. LIGHT WINDS.
MINIMUM HUMIDITY 14 TO 23 PCT.
MONDAY
MOSTLY CLEAR. LOWS 38 TO 48. HIGHS 69 TO 79. LIGHT
WINDS. MINIMUM HUMIDITY 12 TO 21 PCT.
TUESDAY
MOSTLY CLOUDY. LOWS 40 TO 50. HIGHS 67 TO 77.
WEDNESDAY
PARTLY CLOUDY. LOWS 41 TO 51. HIGHS 65 TO 75.
NOTE TO USERS - ZONE 152 VENTILATION CATEGORY...MIXING HEIGHT AND
TRANSPORT WINDS ARE BASED ON THE CHIRICAHUA N.M. LOCATION (5400 MSL)
AZZ153-182315-
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 PM MST THU DEC 18 2025
TODAY
* SKY/WEATHER..............MOSTLY SUNNY (20-30 PCT).
* CHANCE OF PRECIP.........0 PCT.
* CHANCE OF THUNDER........0 PCT.
* MAX TEMPERATURE..........60 TO 70 DEGS.
24 HR TREND...........LITTLE CHANGE.
* MIN HUMIDITY.............16 TO 25 PCT.
24 HR TREND...........LITTLE CHANGE.
* WIND (20 FT/10-MIN AVG)..NORTHWEST AROUND 10 MPH IN THE MORNING
BECOMING LIGHT.
* 10000 FT MSL WIND........NORTHWEST 20 TO 25 MPH.
* MIXING HEIGHT............3964 FT AGL.
* TRANSPORT WINDS..........NORTHWEST 11 TO 14 KNOTS.
* VENTILATION CATEGORY.....GOOD (55496 KNOT-FT).
TONIGHT
* SKY/WEATHER..............MOSTLY CLEAR (15-25 PCT).
* CHANCE OF PRECIP.........0 PCT.
* CHANCE OF THUNDER........0 PCT.
* MIN TEMPERATURE..........36 TO 46 DEGS.
24 HR TREND...........UP 1 DEG.
* MAX HUMIDITY.............39 TO 49 PCT.
24 HR TREND...........DOWN 1 PCT.
* WIND (20 FT/10-MIN AVG)..LIGHT WINDS BECOMING NORTH AROUND 10 MPH
AFTER MIDNIGHT.
* 10000 FT MSL WIND........NORTHWEST 10 TO 15 MPH.
FRIDAY
* SKY/WEATHER..............MOSTLY SUNNY (15-25 PCT).
* CHANCE OF PRECIP.........0 PCT.
* CHANCE OF THUNDER........0 PCT.
* MAX TEMPERATURE..........61 TO 71 DEGS.
24 HR TREND...........UP 1 TO 4 DEGS.
* MIN HUMIDITY.............17 TO 26 PCT.
24 HR TREND...........UP 1 TO 4 PCT.
* WIND (20 FT/10-MIN AVG)..LIGHT WINDS BECOMING SOUTHWEST AROUND 10
MPH IN THE AFTERNOON.
* 10000 FT MSL WIND........WEST 25 TO 30 MPH.
* MIXING HEIGHT............3728 FT AGL.
* TRANSPORT WINDS..........NORTH 8 KNOTS INCREASING TO WEST 18
KNOTS IN THE AFTERNOON.
* VENTILATION CATEGORY.....GOOD (67104 KNOT-FT).
FORECAST DAYS 3 THROUGH 7...
WINDS IN DAYS 3 THROUGH 5 ARE SURFACE 20 FT/10-MIN AVG
SATURDAY
MOSTLY CLEAR. LOWS 36 TO 46. HIGHS 59 TO 69. LIGHT
WINDS. MINIMUM HUMIDITY 16 TO 25 PCT.
SUNDAY
MOSTLY CLEAR. LOWS 35 TO 45. HIGHS 60 TO 70. LIGHT
WINDS. MINIMUM HUMIDITY 17 TO 27 PCT.
MONDAY
MOSTLY CLEAR. LOWS 35 TO 45. HIGHS 62 TO 72. LIGHT
WINDS. MINIMUM HUMIDITY 13 TO 20 PCT.
TUESDAY
MOSTLY CLOUDY. LOWS 37 TO 47. HIGHS 58 TO 68.
WEDNESDAY
PARTLY CLOUDY. SLIGHT CHANCE OF SHOWERS AND
THUNDERSTORMS. LOWS 37 TO 47. HIGHS 55 TO 65.
NOTE TO USERS - ZONE 153 VENTILATION CATEGORY...MIXING HEIGHT AND
TRANSPORT WINDS ARE BASED ON THE POINT OF PINES LOCATION (6040 MSL)
AZZ154-182315-
ARIZONA FIRE WEATHER ZONE 154
FOREST WOODLANDS FDRA INCLUDING THE SKY ISLANDS OF SOUTHEAST
ARIZONA ABOVE 5500 FEET-CORONADO NF-TDC-
110 PM MST THU DEC 18 2025
TODAY
* SKY/WEATHER..............MOSTLY SUNNY (20-30 PCT).
* CHANCE OF PRECIP.........0 PCT.
* CHANCE OF THUNDER........0 PCT.
* MAX TEMPERATURE..........61 TO 71 DEGS.
24 HR TREND...........LITTLE CHANGE.
* MIN HUMIDITY.............16 TO 26 PCT.
24 HR TREND...........UP 2 TO 5 PCT.
* WIND (20 FT/10-MIN AVG)..LIGHT WINDS.
* 10000 FT MSL WIND........NORTHWEST 20 TO 25 MPH.
* MIXING HEIGHT............4252 FT AGL.
* TRANSPORT WINDS..........NORTHWEST 9 KNOTS.
* VENTILATION CATEGORY.....FAIR (38268 KNOT-FT).
TONIGHT
* SKY/WEATHER..............MOSTLY CLEAR (15-25 PCT).
* CHANCE OF PRECIP.........0 PCT.
* CHANCE OF THUNDER........0 PCT.
* MIN TEMPERATURE..........42 TO 52 DEGS.
24 HR TREND...........UP 1 TO 4 DEGS.
* MAX HUMIDITY.............31 TO 41 PCT.
24 HR TREND...........DOWN 1 TO 4 PCT.
* WIND (20 FT/10-MIN AVG)..LIGHT WINDS.
* 10000 FT MSL WIND........NORTH 15 TO 20 MPH.
FRIDAY
* SKY/WEATHER..............MOSTLY SUNNY (15-25 PCT).
* CHANCE OF PRECIP.........0 PCT.
* CHANCE OF THUNDER........0 PCT.
* MAX TEMPERATURE..........64 TO 74 DEGS.
24 HR TREND...........UP 2 TO 5 DEGS.
* MIN HUMIDITY.............15 TO 25 PCT.
24 HR TREND...........DOWN 1 PCT.
* WIND (20 FT/10-MIN AVG)..SOUTHWEST AROUND 10 MPH.
* 10000 FT MSL WIND........NORTHWEST 20 TO 25 MPH.
* MIXING HEIGHT............4303 FT AGL.
* TRANSPORT WINDS..........SOUTHEAST 6 KNOTS SHIFTING TO THE WEST
14 KNOTS IN THE AFTERNOON.
* VENTILATION CATEGORY.....GOOD (60242 KNOT-FT).
FORECAST DAYS 3 THROUGH 7...
WINDS IN DAYS 3 THROUGH 5 ARE SURFACE 20 FT/10-MIN AVG
SATURDAY
MOSTLY CLEAR. LOWS 42 TO 52. HIGHS 61 TO 71. LIGHT
WINDS. MINIMUM HUMIDITY 15 TO 25 PCT.
SUNDAY
CLEAR. LOWS 41 TO 51. HIGHS 62 TO 72. LIGHT WINDS.
MINIMUM HUMIDITY 15 TO 25 PCT.
MONDAY
MOSTLY CLEAR. LOWS 40 TO 50. HIGHS 63 TO 73. LIGHT
WINDS. MINIMUM HUMIDITY 12 TO 22 PCT.
TUESDAY
MOSTLY CLOUDY. SLIGHT CHANCE OF SHOWERS. LOWS 43 TO
53. HIGHS 61 TO 71.
WEDNESDAY
PARTLY CLOUDY. SLIGHT CHANCE OF SHOWERS. LOWS 42 TO
52. HIGHS 58 TO 68.
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