829
FNUS55 KREV 181930
FWFREV
FIRE WEATHER PLANNING FORECAST
NATIONAL WEATHER SERVICE RENO NV
1230 PM PDT TUE AUG 18 2026
DISCUSSION
WARM AFTERNOONS AND POOR OVERNIGHT RECOVERIES ALONG WITH TYPICAL
AFTERNOON BREEZES TO AROUND 20 MPH CONTINUE THROUGH THURSDAY. WINDS
INCREASE THURSDAY WITH THE STRONGEST GUSTS POTENTIALLY ON FRIDAY AND
SATURDAY TO 30-35 MPH FOR NORTHERN NV AND CA. RAIN AND STORM CHANCES
RETURN AS EARLY AS THURSDAY FOR MONO, MINERAL, PERSHING AND CHURCHILL
COUNTIES.
NOTE: THUNDERSTORMS IMPLY GUSTY AND ERRATIC WINDS.
NOTE: MIXING HEIGHTS ARE IN FEET ABOVE GROUND LEVEL OF THE VALLEY FLOORS.
NOTE: PLEASE SEE OPERATING PLAN FOR DETAILED ZONE DESCRIPTIONS
HTTPS://WWW.WEATHER.GOV/WRH/FIRE?WFO=REV
NVZ420-191430-
NORTHERN SIERRA FRONT INCLUDING CARSON CITY, DOUGLAS, STOREY,
SOUTHERN WASHOE, WESTERN LYON, AND FAR SOUTHERN LASSEN COUNTIES-
1230 PM PDT TUE AUG 18 2026
TONIGHT
* SKY/WEATHER........PARTLY CLOUDY THEN BECOMING MOSTLY CLOUDY.
* CHANCE OF THUNDER..0%.
* CHC WETTING RAIN...0%.
* MIN TEMPERATURE....
* VALLEYS..........53-63.
* MID SLOPE........57-67.
* 24 HR TREND......LITTLE CHANGE.
* MAX HUMIDITY.......
* VALLEYS..........35-45%.
* MID SLOPE........22-32%.
* 24 HR TREND......7% DRIER.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....NORTHWEST WINDS 5 TO 10 MPH WITH GUSTS TO 20 MPH
IN THE EVENING BECOMING DOWNSLOPE 2 TO 5 MPH.
* RIDGE TOP........LIGHT WINDS.
* MIXING HEIGHT......4700-5700 FT AGL IN THE EVENING THEN 200-500
FT AGL.
* TRANSPORT WINDS....WEST 10 TO 15 MPH.
* VENTILATION........EXCELLENT DECREASING TO POOR AFTER MIDNIGHT.
WEDNESDAY
* SKY/WEATHER........PARTLY CLOUDY THEN BECOMING SUNNY.
* CHANCE OF THUNDER..0%.
* CHC WETTING RAIN...0%.
* MAX TEMPERATURE....
* VALLEYS..........87-97.
* MID SLOPE........85-95.
* 24 HR TREND......LITTLE CHANGE.
* MIN HUMIDITY.......
* VALLEYS..........5-15%.
* MID SLOPE........10-18%.
* 24 HR TREND......LITTLE CHANGE.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....UPSLOPE 4 TO 8 MPH.
* RIDGE TOP........SOUTHWEST WINDS 10 TO 15 MPH. GUSTS TO 20 MPH
LATE IN THE AFTERNOON.
* MIXING HEIGHT......1300-1800 FT AGL INCREASING TO 6400-7400 FT
AGL IN THE AFTERNOON.
* TRANSPORT WINDS....LIGHT WINDS BECOMING SOUTHWEST 10 TO 15 MPH IN
THE AFTERNOON.
* VENTILATION........MARGINAL INCREASING TO EXCELLENT IN THE
AFTERNOON.
WEDNESDAY NIGHT
* SKY/WEATHER........PARTLY CLOUDY.
* CHANCE OF THUNDER..0%.
* CHC WETTING RAIN...0%.
* MIN TEMPERATURE....
* VALLEYS..........51-61.
* MID SLOPE........56-66.
* MAX HUMIDITY.......
* VALLEYS..........33-43%.
* MID SLOPE........21-31%.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....WEST WINDS 9 TO 14 MPH UNTIL EARLY MORNING
BECOMING DOWNSLOPE 2 TO 5 MPH.
* RIDGE TOP........WEST WINDS 10 TO 15 MPH WITH GUSTS TO 25 MPH.
* MIXING HEIGHT......5100-6100 FT AGL DECREASING TO 600 FT AGL
AFTER MIDNIGHT.
* TRANSPORT WINDS....WEST 10 TO 15 MPH.
* VENTILATION........EXCELLENT DECREASING TO POOR AFTER MIDNIGHT.
THURSDAY
* SKY/WEATHER........SUNNY.
* CHANCE OF THUNDER..0%.
* CHC WETTING RAIN...0%.
* MAX TEMPERATURE....
* VALLEYS..........87-97.
* MID SLOPE........85-95.
* MIN HUMIDITY.......
* VALLEYS..........5-15%.
* MID SLOPE........9-17%.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....UPSLOPE 4 TO 8 MPH.
* RIDGE TOP........LIGHT WINDS.
* MIXING HEIGHT......200-500 FT AGL THEN 5800-6800 FT AGL IN THE
AFTERNOON.
* TRANSPORT WINDS....LIGHT WINDS.
* VENTILATION........POOR INCREASING TO EXCELLENT IN THE AFTERNOON.
EXTENDED
THURSDAY NIGHT
PARTLY CLOUDY. LOWS 52-62. WEST WINDS 8 TO 13 MPH
UNTIL EARLY MORNING BECOMING DOWNSLOPE 2 TO 5 MPH.
FRIDAY
PARTLY CLOUDY. HIGHS 84-94. LOWS 50-60. SOUTHWEST WINDS
10 TO 15 MPH.
SATURDAY THROUGH SUNDAY
CLEAR. HIGHS 82-92. LOWS 48-58. SOUTHWEST
WINDS 8 TO 13 MPH.
MONDAY
PARTLY CLOUDY. HIGHS 81-91. LOWS 49-59.
TUESDAY
SUNNY. HIGHS 79-89.
NVZ421-191430-
SOUTHERN SIERRA FRONT INCLUDING ALPINE, NORTHERN MONO, SOUTHERN
LYON, AND WESTERN MINERAL COUNTIES-
1230 PM PDT TUE AUG 18 2026
TONIGHT
* SKY/WEATHER........PARTLY CLOUDY THEN BECOMING MOSTLY CLOUDY.
* CHANCE OF THUNDER..0%.
* CHC WETTING RAIN...0%.
* MIN TEMPERATURE....
* VALLEYS..........49-59.
* MID SLOPE........59-69.
* 24 HR TREND......LITTLE CHANGE.
* MAX HUMIDITY.......
* VALLEYS..........41-51%.
* MID SLOPE........28-38%.
* 24 HR TREND......7% DRIER.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....NORTHWEST WINDS 7 TO 12 MPH WITH GUSTS TO 20 MPH
IN THE EVENING BECOMING DOWNSLOPE 2 TO 5 MPH.
* RIDGE TOP........LIGHT WINDS BECOMING SOUTH 10 TO 15 MPH AFTER
MIDNIGHT.
* MIXING HEIGHT......4700-5700 FT AGL DECREASING TO 600 FT AGL
AFTER MIDNIGHT.
* TRANSPORT WINDS....NORTHWEST 10 TO 15 MPH.
* VENTILATION........EXCELLENT DECREASING TO POOR AFTER MIDNIGHT.
WEDNESDAY
* SKY/WEATHER........PARTLY CLOUDY.
* CHANCE OF THUNDER..0%.
* CHC WETTING RAIN...0%.
* MAX TEMPERATURE....
* VALLEYS..........86-96.
* MID SLOPE........80-90.
* 24 HR TREND......LITTLE CHANGE.
* MIN HUMIDITY.......
* VALLEYS..........12-19%.
* MID SLOPE........12-22%.
* 24 HR TREND......LITTLE CHANGE.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....UPSLOPE 4 TO 8 MPH BECOMING NORTH 8 TO 13 MPH
WITH GUSTS TO 20 MPH IN THE AFTERNOON.
* RIDGE TOP........SOUTH WINDS 10 TO 15 MPH SHIFTING TO THE
SOUTHWEST IN THE LATE MORNING AND AFTERNOON.
* MIXING HEIGHT......1700-2700 FT AGL INCREASING TO 9100-10100 FT
AGL IN THE AFTERNOON.
* TRANSPORT WINDS....SOUTH 10 TO 15 MPH.
* VENTILATION........FAIR INCREASING TO EXCELLENT IN THE AFTERNOON.
WEDNESDAY NIGHT
* SKY/WEATHER........MOSTLY CLOUDY.
* CHANCE OF THUNDER..0%.
* CHC WETTING RAIN...0%.
* MIN TEMPERATURE....
* VALLEYS..........49-59.
* MID SLOPE........60-70.
* MAX HUMIDITY.......
* VALLEYS..........35-45%.
* MID SLOPE........22-32%.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....WEST WINDS 9 TO 14 MPH UNTIL EARLY MORNING
BECOMING DOWNSLOPE 2 TO 5 MPH.
* RIDGE TOP........SOUTHWEST WINDS 10 TO 15 MPH WITH GUSTS TO 25
MPH.
* MIXING HEIGHT......5100-6100 FT AGL DECREASING TO 600 FT AGL
AFTER MIDNIGHT.
* TRANSPORT WINDS....WEST 10 TO 15 MPH.
* VENTILATION........EXCELLENT DECREASING TO POOR AFTER MIDNIGHT.
THURSDAY
* SKY/WEATHER........SUNNY.
* CHANCE OF THUNDER..0%.
* CHC WETTING RAIN...0%.
* MAX TEMPERATURE....
* VALLEYS..........86-96.
* MID SLOPE........80-90.
* MIN HUMIDITY.......
* VALLEYS..........11-18%.
* MID SLOPE........11-20%.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....UPSLOPE 4 TO 8 MPH BECOMING NORTH 7 TO 12 MPH
WITH GUSTS TO 20 MPH LATE IN THE AFTERNOON.
* RIDGE TOP........SOUTHWEST WINDS 10 TO 15 MPH.
* MIXING HEIGHT......600 FT AGL INCREASING TO 8000-9000 FT AGL IN
THE AFTERNOON.
* TRANSPORT WINDS....SOUTHWEST 10 TO 15 MPH.
* VENTILATION........POOR INCREASING TO EXCELLENT IN THE AFTERNOON.
EXTENDED
THURSDAY NIGHT
PARTLY CLOUDY. LOWS 49-59. WEST WINDS 9 TO 14 MPH
UNTIL EARLY MORNING BECOMING DOWNSLOPE 2 TO 5 MPH.
FRIDAY THROUGH SATURDAY
PARTLY CLOUDY. HIGHS 82-92. LOWS 44-54.
SOUTHWEST WINDS 10 TO 15 MPH.
SUNDAY
MOSTLY CLEAR. SLIGHT CHANCE OF SHOWERS. HIGHS 80-90. LOWS 44-54.
SOUTHWEST WINDS 10 TO 15 MPH.
MONDAY
PARTLY CLOUDY. SLIGHT CHANCE OF SHOWERS. HIGHS 80-90. LOWS
44-54.
TUESDAY
SUNNY. HIGHS 79-89.
CAZ272-191430-
GREATER LAKE TAHOE AND TRUCKEE AREA-
1230 PM PDT TUE AUG 18 2026
TONIGHT
* SKY/WEATHER........PARTLY CLOUDY THEN BECOMING MOSTLY CLOUDY.
* CHANCE OF THUNDER..0%.
* CHC WETTING RAIN...0%.
* MIN TEMPERATURE....
* VALLEYS..........47-57.
* MID SLOPE........52-62.
* 24 HR TREND......LITTLE CHANGE.
* MAX HUMIDITY.......
* VALLEYS..........56-66%.
* MID SLOPE........27-37%.
* 24 HR TREND......5% DRIER.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....DOWNSLOPE 2 TO 5 MPH.
* RIDGE TOP........LIGHT WINDS BECOMING SOUTH 10 TO 15 MPH LATE IN
THE NIGHT.
* MIXING HEIGHT......2800-3800 FT AGL DECREASING TO 600 FT AGL
AFTER MIDNIGHT.
* TRANSPORT WINDS....WEST 10 TO 15 MPH.
* VENTILATION........GOOD DECREASING TO POOR AFTER MIDNIGHT.
WEDNESDAY
* SKY/WEATHER........PARTLY CLOUDY THEN BECOMING SUNNY.
* CHANCE OF THUNDER..0%.
* CHC WETTING RAIN...0%.
* MAX TEMPERATURE....
* VALLEYS..........76-86.
* MID SLOPE........74-84.
* 24 HR TREND......LITTLE CHANGE.
* MIN HUMIDITY.......
* VALLEYS..........14-24%.
* MID SLOPE........15-25%.
* 24 HR TREND......LITTLE CHANGE.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....UPSLOPE 4 TO 8 MPH BECOMING WEST 5 TO 10 MPH
WITH GUSTS TO 20 MPH LATE IN THE AFTERNOON.
* RIDGE TOP........SOUTHWEST WINDS 10 TO 15 MPH.
* MIXING HEIGHT......1700-2200 FT AGL INCREASING TO 5300-6300 FT
AGL IN THE AFTERNOON.
* TRANSPORT WINDS....SOUTHWEST 10 TO 15 MPH.
* VENTILATION........FAIR INCREASING TO EXCELLENT IN THE AFTERNOON.
WEDNESDAY NIGHT
* SKY/WEATHER........CLEAR THEN BECOMING PARTLY CLOUDY.
* CHANCE OF THUNDER..0%.
* CHC WETTING RAIN...0%.
* MIN TEMPERATURE....
* VALLEYS..........47-57.
* MID SLOPE........51-61.
* MAX HUMIDITY.......
* VALLEYS..........50-60%.
* MID SLOPE........23-33%.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....WEST WINDS 5 TO 10 MPH WITH GUSTS TO 20 MPH IN
THE EVENING BECOMING DOWNSLOPE 2 TO 5 MPH.
* RIDGE TOP........SOUTHWEST WINDS 10 TO 15 MPH WITH GUSTS TO 30
MPH.
* MIXING HEIGHT......2700-3700 FT AGL DECREASING TO 600 FT AGL
AFTER MIDNIGHT.
* TRANSPORT WINDS....WEST 10 TO 15 MPH.
* VENTILATION........VERY GOOD DECREASING TO POOR AFTER MIDNIGHT.
THURSDAY
* SKY/WEATHER........PARTLY CLOUDY THEN BECOMING SUNNY.
* CHANCE OF THUNDER..0%.
* CHC WETTING RAIN...0%.
* MAX TEMPERATURE....
* VALLEYS..........76-86.
* MID SLOPE........73-83.
* MIN HUMIDITY.......
* VALLEYS..........15-25%.
* MID SLOPE........16-26%.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....UPSLOPE 4 TO 8 MPH BECOMING WEST 5 TO 10 MPH
WITH GUSTS TO 20 MPH LATE IN THE AFTERNOON.
* RIDGE TOP........SOUTHWEST WINDS 10 TO 15 MPH WITH GUSTS TO 25
MPH.
* MIXING HEIGHT......600 FT AGL INCREASING TO 5700-6700 FT AGL IN
THE AFTERNOON.
* TRANSPORT WINDS....SOUTHWEST 10 TO 15 MPH.
* VENTILATION........POOR INCREASING TO EXCELLENT IN THE AFTERNOON.
EXTENDED
THURSDAY NIGHT
PARTLY CLOUDY. LOWS 48-58. WEST WINDS 7 TO 12 MPH
IN THE EVENING BECOMING DOWNSLOPE 2 TO 5 MPH.
FRIDAY
PARTLY CLOUDY. HIGHS 72-82. LOWS 46-56. SOUTHWEST WINDS
10 TO 15 MPH.
SATURDAY
CLEAR. HIGHS 70-80. LOWS 43-53. SOUTHWEST WINDS 10 TO
15 MPH.
SUNDAY
CLEAR. HIGHS 71-81. LOWS 43-53. SLOPE WINDS.
MONDAY THROUGH TUESDAY
CLEAR. HIGHS 70-80. LOWS 43-53.
NVZ423-191430-
WEST HUMBOLDT BASIN IN PERSHING COUNTY-
1230 PM PDT TUE AUG 18 2026
TONIGHT
* SKY/WEATHER........PARTLY CLOUDY THEN BECOMING MOSTLY CLOUDY.
* CHANCE OF THUNDER..0%.
* CHC WETTING RAIN...0%.
* MIN TEMPERATURE....
* VALLEYS..........58-68.
* MID SLOPE........60-69.
* 24 HR TREND......LITTLE CHANGE.
* MAX HUMIDITY.......
* VALLEYS..........20-30%.
* MID SLOPE........17-27%.
* 24 HR TREND......4% DRIER.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....WEST WINDS 5 TO 10 MPH IN THE EVENING BECOMING
DOWNSLOPE 2 TO 5 MPH.
* RIDGE TOP........LIGHT WINDS.
* MIXING HEIGHT......4600-5600 FT AGL IN THE EVENING THEN 200-500
FT AGL.
* TRANSPORT WINDS....NORTHWEST 10 TO 15 MPH.
* VENTILATION........VERY GOOD DECREASING TO POOR AFTER MIDNIGHT.
WEDNESDAY
* SKY/WEATHER........MOSTLY CLOUDY THEN BECOMING SUNNY.
* CHANCE OF THUNDER..0%.
* CHC WETTING RAIN...0%.
* MAX TEMPERATURE....
* VALLEYS..........94-100.
* MID SLOPE........89-99.
* 24 HR TREND......4 DEGREES WARMER.
* MIN HUMIDITY.......
* VALLEYS..........9-14%.
* MID SLOPE........9-14%.
* 24 HR TREND......LITTLE CHANGE.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....UPSLOPE 4 TO 8 MPH BECOMING SOUTHWEST 5 TO 10
MPH LATE IN THE AFTERNOON.
* RIDGE TOP........SOUTH WINDS 10 TO 15 MPH.
* MIXING HEIGHT......1300-1800 FT AGL INCREASING TO 7600-8600 FT
AGL IN THE AFTERNOON.
* TRANSPORT WINDS....LIGHT WINDS BECOMING SOUTHWEST 10 TO 15 MPH IN
THE AFTERNOON.
* VENTILATION........MARGINAL INCREASING TO EXCELLENT IN THE
AFTERNOON.
WEDNESDAY NIGHT
* SKY/WEATHER........PARTLY CLOUDY.
* CHANCE OF THUNDER..0%.
* CHC WETTING RAIN...0%.
* MIN TEMPERATURE....
* VALLEYS..........59-69.
* MID SLOPE........61-70.
* MAX HUMIDITY.......
* VALLEYS..........22-32%.
* MID SLOPE........19-29%.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....SOUTHWEST WINDS 5 TO 10 MPH IN THE EVENING
BECOMING DOWNSLOPE 2 TO 5 MPH.
* RIDGE TOP........LIGHT WINDS BECOMING NORTHWEST 10 TO 15 MPH
AFTER MIDNIGHT.
* MIXING HEIGHT......4800-5800 FT AGL DECREASING TO 600 FT AGL
AFTER MIDNIGHT.
* TRANSPORT WINDS....WEST 10 TO 15 MPH.
* VENTILATION........EXCELLENT DECREASING TO MARGINAL AFTER
MIDNIGHT.
THURSDAY
* SKY/WEATHER........PARTLY CLOUDY.
* CHANCE OF THUNDER..0%.
* CHC WETTING RAIN...0%.
* MAX TEMPERATURE....
* VALLEYS..........93-101.
* MID SLOPE........89-99.
* MIN HUMIDITY.......
* VALLEYS..........9-14%.
* MID SLOPE........9-14%.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....UPSLOPE 4 TO 8 MPH.
* RIDGE TOP........WEST WINDS 10 TO 15 MPH.
* MIXING HEIGHT......200-500 FT AGL THEN 5700-6700 FT AGL IN THE
AFTERNOON.
* TRANSPORT WINDS....LIGHT WINDS.
* VENTILATION........POOR INCREASING TO EXCELLENT IN THE AFTERNOON.
EXTENDED
THURSDAY NIGHT
PARTLY CLOUDY. LOWS 59-69. SOUTHWEST WINDS 5 TO
10 MPH IN THE EVENING BECOMING DOWNSLOPE 2 TO 5 MPH.
FRIDAY THROUGH SATURDAY
PARTLY CLOUDY. HIGHS 89-98. LOWS 55-65.
WEST WINDS 10 TO 15 MPH.
SUNDAY
PARTLY CLOUDY. HIGHS 88-94. LOWS 55-65. SLOPE WINDS.
MONDAY
PARTLY CLOUDY. HIGHS 88-94. LOWS 56-66.
TUESDAY
SUNNY. HIGHS 86-92.
NVZ429-191430-
LAHONTAN BASIN INCLUDING CHURCHILL AND EASTERN MINERAL COUNTIES-
1230 PM PDT TUE AUG 18 2026
TONIGHT
* SKY/WEATHER........PARTLY CLOUDY THEN BECOMING MOSTLY CLOUDY.
* CHANCE OF THUNDER..0%.
* CHC WETTING RAIN...0%.
* MIN TEMPERATURE....
* VALLEYS..........57-67.
* MID SLOPE........61-71.
* 24 HR TREND......LITTLE CHANGE.
* MAX HUMIDITY.......
* VALLEYS..........30-40%.
* MID SLOPE........19-29%.
* 24 HR TREND......5% DRIER.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....NORTHWEST WINDS 5 TO 10 MPH IN THE EVENING
BECOMING DOWNSLOPE 2 TO 5 MPH.
* RIDGE TOP........LIGHT WINDS.
* MIXING HEIGHT......4600-5600 FT AGL IN THE EVENING THEN 200-500
FT AGL.
* TRANSPORT WINDS....NORTHWEST 10 TO 15 MPH.
* VENTILATION........VERY GOOD DECREASING TO POOR AFTER MIDNIGHT.
WEDNESDAY
* SKY/WEATHER........PARTLY CLOUDY.
* CHANCE OF THUNDER..0%.
* CHC WETTING RAIN...0%.
* MAX TEMPERATURE....
* VALLEYS..........91-101.
* MID SLOPE........87-97.
* 24 HR TREND......4 DEGREES WARMER.
* MIN HUMIDITY.......
* VALLEYS..........10-17%.
* MID SLOPE........10-16%.
* 24 HR TREND......LITTLE CHANGE.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....UPSLOPE 4 TO 8 MPH.
* RIDGE TOP........SOUTH WINDS 10 TO 15 MPH.
* MIXING HEIGHT......1400-1900 FT AGL INCREASING TO 7500-8500 FT
AGL IN THE AFTERNOON.
* TRANSPORT WINDS....LIGHT WINDS.
* VENTILATION........MARGINAL INCREASING TO VERY GOOD IN THE
AFTERNOON.
WEDNESDAY NIGHT
* SKY/WEATHER........MOSTLY CLOUDY THEN BECOMING PARTLY CLOUDY.
* CHANCE OF THUNDER..0%.
* CHC WETTING RAIN...0%.
* MIN TEMPERATURE....
* VALLEYS..........57-67.
* MID SLOPE........62-72.
* MAX HUMIDITY.......
* VALLEYS..........29-39%.
* MID SLOPE........20-30%.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....NORTHWEST WINDS 7 TO 12 MPH UNTIL EARLY MORNING
BECOMING DOWNSLOPE 2 TO 5 MPH.
* RIDGE TOP........WEST WINDS 10 TO 15 MPH.
* MIXING HEIGHT......5000-6000 FT AGL DECREASING TO 600 FT AGL
AFTER MIDNIGHT.
* TRANSPORT WINDS....WEST 10 TO 15 MPH.
* VENTILATION........EXCELLENT DECREASING TO MARGINAL AFTER
MIDNIGHT.
THURSDAY
* SKY/WEATHER........PARTLY CLOUDY THEN BECOMING SUNNY.
* CHANCE OF THUNDER..0%.
* CHC WETTING RAIN...0%.
* MAX TEMPERATURE....
* VALLEYS..........91-101.
* MID SLOPE........87-97.
* MIN HUMIDITY.......
* VALLEYS..........9-16%.
* MID SLOPE........10-15%.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....UPSLOPE 4 TO 8 MPH.
* RIDGE TOP........LIGHT WINDS BECOMING WEST 10 TO 15 MPH LATE IN
THE AFTERNOON.
* MIXING HEIGHT......600 FT AGL INCREASING TO 6100-7100 FT AGL IN
THE AFTERNOON.
* TRANSPORT WINDS....LIGHT WINDS.
* VENTILATION........POOR INCREASING TO EXCELLENT IN THE AFTERNOON.
EXTENDED
THURSDAY NIGHT
PARTLY CLOUDY. LOWS 57-67. NORTHWEST WINDS 7 TO
12 MPH UNTIL EARLY MORNING BECOMING DOWNSLOPE 2 TO 5 MPH.
FRIDAY THROUGH SATURDAY
PARTLY CLOUDY. HIGHS 88-98. LOWS 54-64.
WEST WINDS 10 TO 15 MPH.
SUNDAY
PARTLY CLOUDY. SLIGHT CHANCE OF SHOWERS. HIGHS 85-95. LOWS
54-64. SLOPE WINDS.
MONDAY
PARTLY CLOUDY. SLIGHT CHANCE OF SHOWERS. HIGHS 85-95. LOWS
54-64.
TUESDAY
SUNNY. HIGHS 84-94.
CAZ270-278-NVZ458-191430-
SURPRISE VALLEY CALIFORNIA-EASTERN LASSEN COUNTY-
NORTHERN WASHOE COUNTY-
1230 PM PDT TUE AUG 18 2026
TONIGHT
* SKY/WEATHER........CLEAR THEN BECOMING PARTLY CLOUDY.
* CHANCE OF THUNDER..0%.
* CHC WETTING RAIN...0%.
* MIN TEMPERATURE....
* VALLEYS..........48-58.
* MID SLOPE........54-64.
* 24 HR TREND......LITTLE CHANGE.
* MAX HUMIDITY.......
* VALLEYS..........30-40%.
* MID SLOPE........22-32%.
* 24 HR TREND......6% DRIER.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....WEST WINDS 5 TO 10 MPH WITH GUSTS TO 20 MPH IN
THE EVENING BECOMING DOWNSLOPE 2 TO 5 MPH.
* RIDGE TOP........NORTHWEST WINDS 10 TO 15 MPH.
* MIXING HEIGHT......4700-5700 FT AGL IN THE EVENING THEN 200-500
FT AGL.
* TRANSPORT WINDS....NORTHWEST 10 TO 15 MPH.
* VENTILATION........EXCELLENT DECREASING TO POOR AFTER MIDNIGHT.
WEDNESDAY
* SKY/WEATHER........MOSTLY CLOUDY THEN BECOMING SUNNY.
* CHANCE OF THUNDER..0%.
* CHC WETTING RAIN...0%.
* MAX TEMPERATURE....
* VALLEYS..........88-98.
* MID SLOPE........86-94.
* 24 HR TREND......LITTLE CHANGE.
* MIN HUMIDITY.......
* VALLEYS..........5-15%.
* MID SLOPE........8-13%.
* 24 HR TREND......LITTLE CHANGE.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....UPSLOPE 4 TO 8 MPH BECOMING SOUTHWEST 9 TO 14
MPH WITH GUSTS TO 25 MPH IN THE AFTERNOON.
* RIDGE TOP........SOUTH WINDS 10 TO 15 MPH WITH GUSTS TO 25 MPH.
* MIXING HEIGHT......1400-1900 FT AGL INCREASING TO 8000-9000 FT
AGL IN THE AFTERNOON.
* TRANSPORT WINDS....LIGHT WINDS BECOMING SOUTHWEST 10 TO 15 MPH IN
THE AFTERNOON.
* VENTILATION........FAIR INCREASING TO EXCELLENT IN THE AFTERNOON.
WEDNESDAY NIGHT
* SKY/WEATHER........CLEAR.
* CHANCE OF THUNDER..0%.
* CHC WETTING RAIN...0%.
* MIN TEMPERATURE....
* VALLEYS..........47-57.
* MID SLOPE........53-63.
* MAX HUMIDITY.......
* VALLEYS..........33-43%.
* MID SLOPE........25-35%.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....WEST WINDS 9 TO 15 MPH WITH GUSTS TO 25 MPH
UNTIL EARLY MORNING BECOMING DOWNSLOPE 2 TO 5
MPH.
* RIDGE TOP........WEST WINDS 10 TO 15 MPH WITH GUSTS TO 25 MPH.
* MIXING HEIGHT......5400-6400 FT AGL IN THE EVENING THEN 200-500
FT AGL.
* TRANSPORT WINDS....WEST 10 TO 15 MPH.
* VENTILATION........EXCELLENT DECREASING TO POOR AFTER MIDNIGHT.
THURSDAY
* SKY/WEATHER........SUNNY.
* CHANCE OF THUNDER..0%.
* CHC WETTING RAIN...0%.
* MAX TEMPERATURE....
* VALLEYS..........88-98.
* MID SLOPE........85-93.
* MIN HUMIDITY.......
* VALLEYS..........5-15%.
* MID SLOPE........9-14%.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....UPSLOPE 4 TO 8 MPH BECOMING SOUTHWEST 8 TO 13
MPH WITH GUSTS TO 25 MPH LATE IN THE
AFTERNOON.
* RIDGE TOP........WEST WINDS 10 TO 15 MPH WITH GUSTS TO 25 MPH.
* MIXING HEIGHT......200-500 FT AGL THEN 6100-7100 FT AGL IN THE
AFTERNOON.
* TRANSPORT WINDS....LIGHT WINDS BECOMING SOUTHWEST 10 TO 15 MPH IN
THE AFTERNOON.
* VENTILATION........POOR INCREASING TO EXCELLENT IN THE AFTERNOON.
EXTENDED
THURSDAY NIGHT
MOSTLY CLOUDY. LOWS 49-59. WEST WINDS 9 TO 15 MPH
IN THE EVENING BECOMING DOWNSLOPE 2 TO 5 MPH.
FRIDAY
PARTLY CLOUDY. HIGHS 85-95. LOWS 45-55. SOUTHWEST WINDS
10 TO 15 MPH.
SATURDAY THROUGH SUNDAY
CLEAR. HIGHS 83-93. LOWS 42-52. SOUTHWEST
WINDS 10 TO 15 MPH.
MONDAY THROUGH TUESDAY
CLEAR. HIGHS 82-92. LOWS 45-55.
CAZ271-191430-
WESTERN LASSEN, EASTERN PLUMAS, AND EASTERN SIERRA COUNTIES-
1230 PM PDT TUE AUG 18 2026
TONIGHT
* SKY/WEATHER........PARTLY CLOUDY.
* CHANCE OF THUNDER..0%.
* CHC WETTING RAIN...0%.
* MIN TEMPERATURE....
* VALLEYS..........41-51.
* MID SLOPE........51-61.
* 24 HR TREND......LITTLE CHANGE.
* MAX HUMIDITY.......
* VALLEYS..........44-54%.
* MID SLOPE........28-38%.
* 24 HR TREND......9% DRIER.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....WEST WINDS 5 TO 10 MPH WITH GUSTS TO 20 MPH IN
THE EVENING BECOMING DOWNSLOPE 2 TO 5 MPH.
* RIDGE TOP........LIGHT WINDS.
* MIXING HEIGHT......4200-5200 FT AGL IN THE EVENING THEN 200-500
FT AGL.
* TRANSPORT WINDS....WEST 10 TO 15 MPH.
* VENTILATION........EXCELLENT DECREASING TO POOR AFTER MIDNIGHT.
WEDNESDAY
* SKY/WEATHER........PARTLY CLOUDY THEN BECOMING SUNNY.
* CHANCE OF THUNDER..0%.
* CHC WETTING RAIN...0%.
* MAX TEMPERATURE....
* VALLEYS..........83-93.
* MID SLOPE........81-91.
* 24 HR TREND......LITTLE CHANGE.
* MIN HUMIDITY.......
* VALLEYS..........11-21%.
* MID SLOPE........10-20%.
* 24 HR TREND......LITTLE CHANGE.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....UPSLOPE 4 TO 8 MPH BECOMING WEST 9 TO 14 MPH
WITH GUSTS TO 25 MPH IN THE AFTERNOON.
* RIDGE TOP........SOUTHWEST WINDS 10 TO 15 MPH.
* MIXING HEIGHT......1500-2000 FT AGL INCREASING TO 7500-8500 FT
AGL IN THE AFTERNOON.
* TRANSPORT WINDS....LIGHT WINDS BECOMING SOUTHWEST 10 TO 15 MPH IN
THE AFTERNOON.
* VENTILATION........FAIR INCREASING TO EXCELLENT IN THE AFTERNOON.
WEDNESDAY NIGHT
* SKY/WEATHER........CLEAR.
* CHANCE OF THUNDER..0%.
* CHC WETTING RAIN...0%.
* MIN TEMPERATURE....
* VALLEYS..........40-50.
* MID SLOPE........51-61.
* MAX HUMIDITY.......
* VALLEYS..........43-53%.
* MID SLOPE........28-38%.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....WEST WINDS 9 TO 14 MPH WITH GUSTS TO 25 MPH IN
THE EVENING BECOMING DOWNSLOPE 2 TO 5 MPH.
* RIDGE TOP........SOUTHWEST WINDS 10 TO 15 MPH WITH GUSTS TO 25
MPH.
* MIXING HEIGHT......3900-4900 FT AGL IN THE EVENING THEN 200-500
FT AGL.
* TRANSPORT WINDS....SOUTHWEST 10 TO 15 MPH.
* VENTILATION........EXCELLENT DECREASING TO POOR AFTER MIDNIGHT.
THURSDAY
* SKY/WEATHER........SUNNY.
* CHANCE OF THUNDER..0%.
* CHC WETTING RAIN...0%.
* MAX TEMPERATURE....
* VALLEYS..........83-93.
* MID SLOPE........80-90.
* MIN HUMIDITY.......
* VALLEYS..........11-21%.
* MID SLOPE........10-20%.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....UPSLOPE 4 TO 8 MPH BECOMING SOUTHWEST 7 TO 12
MPH WITH GUSTS TO 20 MPH LATE IN THE
AFTERNOON.
* RIDGE TOP........SOUTHWEST WINDS 10 TO 15 MPH.
* MIXING HEIGHT......200-500 FT AGL THEN 6800-7800 FT AGL IN THE
AFTERNOON.
* TRANSPORT WINDS....LIGHT WINDS BECOMING SOUTHWEST 10 TO 15 MPH IN
THE AFTERNOON.
* VENTILATION........POOR INCREASING TO EXCELLENT IN THE AFTERNOON.
EXTENDED
THURSDAY NIGHT
MOSTLY CLOUDY. LOWS 42-52. SOUTHWEST WINDS 9 TO
14 MPH IN THE EVENING BECOMING DOWNSLOPE 2 TO 5 MPH.
FRIDAY
PARTLY CLOUDY. HIGHS 78-88. LOWS 38-48. SOUTHWEST WINDS
10 TO 15 MPH.
SATURDAY
CLEAR. HIGHS 77-87. LOWS 36-46. SOUTHWEST WINDS 10 TO
15 MPH.
SUNDAY
CLEAR. HIGHS 78-88. LOWS 36-46. SOUTHWEST WINDS 10 TO
15 MPH.
MONDAY THROUGH TUESDAY
CLEAR. HIGHS 77-87. LOWS 37-47.
CAZ274-191430-
SOUTHERN MONO COUNTY-
1230 PM PDT TUE AUG 18 2026
TONIGHT
* SKY/WEATHER........MOSTLY CLOUDY.
* CHANCE OF THUNDER..0%.
* CHC WETTING RAIN...0%.
* MIN TEMPERATURE....
* VALLEYS..........48-58.
* MID SLOPE........51-61.
* 24 HR TREND......4 DEGREES WARMER.
* MAX HUMIDITY.......
* VALLEYS..........49-59%.
* MID SLOPE........35-45%.
* 24 HR TREND......LITTLE CHANGE.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....DOWNSLOPE 2 TO 5 MPH.
* RIDGE TOP........LIGHT WINDS.
* MIXING HEIGHT......4600-5600 FT AGL DECREASING TO 600 FT AGL
AFTER MIDNIGHT.
* TRANSPORT WINDS....LIGHT WINDS.
* VENTILATION........VERY GOOD DECREASING TO POOR AFTER MIDNIGHT.
WEDNESDAY
* SKY/WEATHER........PARTLY CLOUDY.
* CHANCE OF THUNDER..0%.
* CHC WETTING RAIN...0%.
* MAX TEMPERATURE....
* VALLEYS..........82-92.
* MID SLOPE........78-88.
* 24 HR TREND......LITTLE CHANGE.
* MIN HUMIDITY.......
* VALLEYS..........12-22%.
* MID SLOPE........14-24%.
* 24 HR TREND......LITTLE CHANGE.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....UPSLOPE 4 TO 8 MPH BECOMING SOUTHWEST 7 TO 12
MPH WITH GUSTS TO 25 MPH LATE IN THE
AFTERNOON.
* RIDGE TOP........SOUTH WINDS 10 TO 15 MPH. GUSTS TO 25 MPH IN THE
AFTERNOON.
* MIXING HEIGHT......1600-2600 FT AGL INCREASING TO 8000-9000 FT
AGL IN THE AFTERNOON.
* TRANSPORT WINDS....SOUTH 10 TO 15 MPH.
* VENTILATION........FAIR INCREASING TO EXCELLENT IN THE AFTERNOON.
WEDNESDAY NIGHT
* SKY/WEATHER........MOSTLY CLOUDY THEN BECOMING PARTLY CLOUDY.
* CHANCE OF THUNDER..0%.
* CHC WETTING RAIN...0%.
* MIN TEMPERATURE....
* VALLEYS..........48-58.
* MID SLOPE........51-61.
* MAX HUMIDITY.......
* VALLEYS..........43-53%.
* MID SLOPE........29-39%.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....SOUTHWEST WINDS 8 TO 13 MPH WITH GUSTS TO 25 MPH
UNTIL EARLY MORNING BECOMING DOWNSLOPE 2 TO 5
MPH.
* RIDGE TOP........SOUTHWEST WINDS 10 TO 15 MPH. GUSTS TO 25 MPH IN
THE EVENING.
* MIXING HEIGHT......4400-5400 FT AGL DECREASING TO 600 FT AGL
AFTER MIDNIGHT.
* TRANSPORT WINDS....SOUTHWEST 10 TO 15 MPH.
* VENTILATION........EXCELLENT DECREASING TO POOR AFTER MIDNIGHT.
THURSDAY
* SKY/WEATHER........SUNNY.
* CHANCE OF THUNDER..0%.
* CHC WETTING RAIN...0%.
* MAX TEMPERATURE....
* VALLEYS..........82-92.
* MID SLOPE........79-89.
* MIN HUMIDITY.......
* VALLEYS..........10-20%.
* MID SLOPE........12-22%.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....UPSLOPE 4 TO 8 MPH BECOMING SOUTH 5 TO 10 MPH
WITH GUSTS TO 25 MPH LATE IN THE AFTERNOON.
* RIDGE TOP........SOUTHWEST WINDS 10 TO 15 MPH. GUSTS TO 25 MPH IN
THE AFTERNOON.
* MIXING HEIGHT......600-900 FT AGL INCREASING TO 7300-8300 FT AGL
IN THE AFTERNOON.
* TRANSPORT WINDS....LIGHT WINDS BECOMING SOUTH 10 TO 15 MPH IN THE
AFTERNOON.
* VENTILATION........POOR INCREASING TO EXCELLENT IN THE AFTERNOON.
EXTENDED
THURSDAY NIGHT
CLEAR. LOWS 48-58. SOUTHWEST WINDS 9 TO 14 MPH
UNTIL EARLY MORNING BECOMING DOWNSLOPE 2 TO 5 MPH.
FRIDAY THROUGH SATURDAY
PARTLY CLOUDY. HIGHS 77-87. LOWS 44-54.
SOUTHWEST WINDS 10 TO 15 MPH.
SUNDAY
MOSTLY CLEAR. SLIGHT CHANCE OF SHOWERS. HIGHS 75-85. LOWS 43-53.
SOUTHWEST WINDS 10 TO 15 MPH.
MONDAY
PARTLY CLOUDY. SLIGHT CHANCE OF SHOWERS. HIGHS 75-85. LOWS
42-52.
TUESDAY
SUNNY. HIGHS 74-84.
.8 TO 14 DAY OUTLOOK FOR (WED AUG 26 THROUGH TUE SEP 1)
ABOVE NORMAL TEMPERATURES AND NEAR NORMAL PRECIPITATION.
=
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