897
FNUS55 KREV 182030
FWFREV
FIRE WEATHER PLANNING FORECAST
NATIONAL WEATHER SERVICE RENO NV
130 PM PDT THU SEP 18 2025
DISCUSSION
DRY CONDITIONS CONTINUE ACROSS NORTHEASTERN CALIFORNIA AND NORTH AND
EAST NEVADA TODAY. SHOWERS HAVE DEVELOPED OVER MONO COUNTY, AND WILL
SPREAD NORTH INTO THE TAHOE BASIN TONIGHT. LIGHTNING CHANCES REMAIN
LOW TODAY (10%) BUT INCREASE FRIDAY (20%) WITH WETTING RAINS LIKELY
ALONG THE SIERRA AND INTO WESTERN NEVADA. SATURDAY TRENDS SLIGHTLY
DRIER, THOUGH ISOLATED STORMS REMAIN POSSIBLE.
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
NVZ420-191515-
NORTHERN SIERRA FRONT INCLUDING CARSON CITY, DOUGLAS, STOREY,
SOUTHERN WASHOE, WESTERN LYON, AND FAR SOUTHERN LASSEN COUNTIES-
130 PM PDT THU SEP 18 2025
TONIGHT
* SKY/WEATHER........CLOUDY. CHANCE OF SHOWERS.
* CHANCE OF THUNDER..0%.
* MIN TEMPERATURE....
* VALLEYS..........50-60.
* MID SLOPE........51-61.
* 24 HR TREND......LITTLE CHANGE.
* MAX HUMIDITY.......
* VALLEYS..........63-73%.
* MID SLOPE........48-58%.
* 24 HR TREND......30% WETTER.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....SOUTH WINDS 7 TO 12 MPH.
* RIDGE TOP........SOUTH WINDS 10 TO 20 MPH. GUSTS TO 30 MPH IN THE
LATE EVENING AND OVERNIGHT.
* CHC WETTING RAIN...10%.
* MIXING HEIGHT......4000-5000 FT AGL DECREASING TO 600-1000 FT AGL
AFTER MIDNIGHT.
* TRANSPORT WINDS....SOUTH 10 TO 20 MPH.
* VENTILATION........EXCELLENT DECREASING TO FAIR AFTER MIDNIGHT.
FRIDAY
* SKY/WEATHER........MOSTLY CLOUDY. CHANCE OF SHOWERS. SLIGHT
CHANCE OF THUNDERSTORMS IN THE AFTERNOON.
* CHANCE OF THUNDER..20%.
* MAX TEMPERATURE....
* VALLEYS..........67-77.
* MID SLOPE........62-72.
* 24 HR TREND......12 DEGREES COOLER.
* MIN HUMIDITY.......
* VALLEYS..........30-40%.
* MID SLOPE........39-49%.
* 24 HR TREND......33% WETTER.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....UPSLOPE 4 TO 8 MPH.
* RIDGE TOP........LIGHT WINDS BECOMING EAST 10 TO 15 MPH EARLY IN
THE AFTERNOON, THEN BECOMING LIGHT LATE IN THE
AFTERNOON.
* CHC WETTING RAIN...15%.
* MIXING HEIGHT......800-1300 FT AGL INCREASING TO 2200-3200 FT AGL
IN THE AFTERNOON.
* TRANSPORT WINDS....LIGHT WINDS.
* VENTILATION........MARGINAL INCREASING TO GOOD IN THE AFTERNOON.
FRIDAY NIGHT
* SKY/WEATHER........MOSTLY CLOUDY. CHANCE OF SHOWERS IN THE
EVENING.
* CHANCE OF THUNDER..0%.
* MIN TEMPERATURE....
* VALLEYS..........46-56.
* MID SLOPE........48-58.
* MAX HUMIDITY.......
* VALLEYS..........78-88%.
* MID SLOPE........66-76%.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....DOWNSLOPE 2 TO 5 MPH.
* RIDGE TOP........LIGHT WINDS. GUSTS TO 20 MPH IN THE EVENING.
* CHC WETTING RAIN...10%.
* MIXING HEIGHT......1400-1900 FT AGL DECREASING TO 600-1000 FT AGL
AFTER MIDNIGHT.
* TRANSPORT WINDS....LIGHT WINDS.
* VENTILATION........FAIR DECREASING TO MARGINAL AFTER MIDNIGHT.
SATURDAY
* SKY/WEATHER........PARTLY CLOUDY. SLIGHT CHANCE OF SHOWERS IN THE
AFTERNOON.
* CHANCE OF THUNDER..0%.
* MAX TEMPERATURE....
* VALLEYS..........70-80.
* MID SLOPE........68-78.
* MIN HUMIDITY.......
* VALLEYS..........24-34%.
* MID SLOPE........30-40%.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....UPSLOPE 4 TO 8 MPH.
* RIDGE TOP........LIGHT WINDS BECOMING WEST 10 TO 15 MPH LATE IN
THE AFTERNOON.
* CHC WETTING RAIN...5%.
* MIXING HEIGHT......600-900 FT AGL INCREASING TO 4400-5400 FT AGL
IN THE AFTERNOON.
* TRANSPORT WINDS....LIGHT WINDS.
* VENTILATION........POOR INCREASING TO VERY GOOD IN THE AFTERNOON.
EXTENDED
SATURDAY NIGHT
PARTLY CLOUDY IN THE EVENING THEN CLEARING. SLIGHT
CHANCE OF SHOWERS IN THE EVENING. LOWS 45-55. WEST WINDS 7 TO 12 MPH
UNTIL EARLY MORNING BECOMING DOWNSLOPE 2 TO 5 MPH.
SUNDAY
CLEAR. HIGHS 71-81. LOWS 45-55. SLOPE WINDS.
MONDAY
CLEAR. HIGHS 74-84. LOWS 45-55. SLOPE WINDS.
TUESDAY
PARTLY CLOUDY. SLIGHT CHANCE OF SHOWERS. HIGHS 76-86.
LOWS 47-57. SLOPE WINDS.
WEDNESDAY THROUGH THURSDAY
PARTLY CLOUDY. SLIGHT CHANCE OF
SHOWERS. HIGHS 70-80. LOWS 44-54.
NVZ421-191515-
SOUTHERN SIERRA FRONT INCLUDING ALPINE, NORTHERN MONO, SOUTHERN
LYON, AND WESTERN MINERAL COUNTIES-
130 PM PDT THU SEP 18 2025
TONIGHT
* SKY/WEATHER........CLOUDY. CHANCE OF SHOWERS.
* CHANCE OF THUNDER..0%.
* MIN TEMPERATURE....
* VALLEYS..........39-49.
* MID SLOPE........49-59.
* 24 HR TREND......4 DEGREES COOLER.
* MAX HUMIDITY.......
* VALLEYS..........74-84%.
* MID SLOPE........57-67%.
* 24 HR TREND......43% WETTER.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....SOUTH WINDS 9 TO 14 MPH UNTIL EARLY MORNING
BECOMING DOWNSLOPE 2 TO 5 MPH.
* RIDGE TOP........SOUTHEAST WINDS 15 TO 25 MPH WITH GUSTS TO 35
MPH.
* CHC WETTING RAIN...30%.
* MIXING HEIGHT......2200-3200 FT AGL DECREASING TO 600-1000 FT AGL
AFTER MIDNIGHT.
* TRANSPORT WINDS....SOUTHEAST 10 TO 15 MPH.
* VENTILATION........VERY GOOD DECREASING TO MARGINAL AFTER
MIDNIGHT.
FRIDAY
* SKY/WEATHER........CHANCE OF SHOWERS IN THE MORNING, THEN SHOWERS
LIKELY AND A SLIGHT CHANCE OF THUNDERSTORMS IN
THE AFTERNOON.
* CHANCE OF THUNDER..20%.
* MAX TEMPERATURE....
* VALLEYS..........63-73.
* MID SLOPE........57-67.
* 24 HR TREND......11 DEGREES COOLER.
* MIN HUMIDITY.......
* VALLEYS..........36-46%.
* MID SLOPE........40-50%.
* 24 HR TREND......35% WETTER.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....UPSLOPE 4 TO 8 MPH.
* RIDGE TOP........SOUTH WINDS 10 TO 15 MPH WITH GUSTS TO 25 MPH.
* CHC WETTING RAIN...30%.
* MIXING HEIGHT......900-1400 FT AGL INCREASING TO 1800-2800 FT AGL
IN THE AFTERNOON.
* TRANSPORT WINDS....SOUTH 10 TO 15 MPH.
* VENTILATION........GOOD.
FRIDAY NIGHT
* SKY/WEATHER........MOSTLY CLOUDY THEN BECOMING PARTLY CLOUDY.
CHANCE OF SHOWERS IN THE EVENING.
* CHANCE OF THUNDER..0%.
* MIN TEMPERATURE....
* VALLEYS..........36-46.
* MID SLOPE........48-58.
* MAX HUMIDITY.......
* VALLEYS..........77-87%.
* MID SLOPE........63-73%.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....DOWNSLOPE 2 TO 5 MPH.
* RIDGE TOP........WEST WINDS 10 TO 15 MPH. GUSTS TO 25 MPH IN THE
EVENING.
* CHC WETTING RAIN...5%.
* MIXING HEIGHT......1700-2200 FT AGL DECREASING TO 600-900 FT AGL
AFTER MIDNIGHT.
* TRANSPORT WINDS....LIGHT WINDS.
* VENTILATION........GOOD DECREASING TO MARGINAL AFTER MIDNIGHT.
SATURDAY
* SKY/WEATHER........PARTLY CLOUDY. CHANCE OF SHOWERS IN THE
AFTERNOON.
* CHANCE OF THUNDER..0%.
* MAX TEMPERATURE....
* VALLEYS..........69-79.
* MID SLOPE........63-73.
* MIN HUMIDITY.......
* VALLEYS..........27-37%.
* MID SLOPE........27-37%.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....UPSLOPE 4 TO 8 MPH.
* RIDGE TOP........LIGHT WINDS BECOMING WEST 10 TO 15 MPH IN THE
LATE MORNING AND AFTERNOON.
* CHC WETTING RAIN...5%.
* MIXING HEIGHT......600-900 FT AGL INCREASING TO 5000-6000 FT AGL
IN THE AFTERNOON.
* TRANSPORT WINDS....LIGHT WINDS.
* VENTILATION........POOR INCREASING TO GOOD IN THE AFTERNOON.
EXTENDED
SATURDAY NIGHT
MOSTLY CLOUDY IN THE EVENING THEN CLEARING. SLIGHT
CHANCE OF SHOWERS IN THE EVENING. LOWS 36-46. DOWNSLOPE 2 TO 5 MPH.
SUNDAY
MOSTLY CLEAR. SLIGHT CHANCE OF SHOWERS. HIGHS 70-80. LOWS 36-46.
SLOPE WINDS.
MONDAY
CLEAR. HIGHS 74-84. LOWS 38-48. SLOPE WINDS.
TUESDAY
PARTLY CLOUDY. SLIGHT CHANCE OF THUNDERSTORMS. HIGHS
74-84. LOWS 39-49. SLOPE WINDS.
WEDNESDAY THROUGH THURSDAY
PARTLY CLOUDY. SLIGHT CHANCE OF
SHOWERS. HIGHS 70-80. LOWS 36-46.
CAZ272-191515-
GREATER LAKE TAHOE AND TRUCKEE AREA-
130 PM PDT THU SEP 18 2025
TONIGHT
* SKY/WEATHER........CLOUDY. CHANCE OF SHOWERS.
* CHANCE OF THUNDER..0%.
* MIN TEMPERATURE....
* VALLEYS..........41-51.
* MID SLOPE........42-52.
* 24 HR TREND......4 DEGREES COOLER.
* MAX HUMIDITY.......
* VALLEYS..........90-100%.
* MID SLOPE........75-85%.
* 24 HR TREND......43% WETTER.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....DOWNSLOPE 2 TO 5 MPH.
* RIDGE TOP........SOUTH WINDS 15 TO 25 MPH.
* CHC WETTING RAIN...20%.
* MIXING HEIGHT......2100-3100 FT AGL DECREASING TO 600-800 FT AGL
AFTER MIDNIGHT.
* TRANSPORT WINDS....SOUTHEAST 10 TO 15 MPH.
* VENTILATION........GOOD DECREASING TO MARGINAL AFTER MIDNIGHT.
FRIDAY
* SKY/WEATHER........CLOUDY. CHANCE OF SHOWERS. SLIGHT CHANCE OF
THUNDERSTORMS IN THE AFTERNOON.
* CHANCE OF THUNDER..20%.
* MAX TEMPERATURE....
* VALLEYS..........57-64.
* MID SLOPE........52-62.
* 24 HR TREND......15 DEGREES COOLER.
* MIN HUMIDITY.......
* VALLEYS..........64-74%.
* MID SLOPE........59-69%.
* 24 HR TREND......50% WETTER.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....UPSLOPE 4 TO 8 MPH.
* RIDGE TOP........SOUTHEAST WINDS 10 TO 15 MPH. GUSTS TO 25 MPH IN
THE MORNING.
* CHC WETTING RAIN...30%.
* MIXING HEIGHT......600-1000 FT AGL INCREASING TO 1000-1500 FT AGL
IN THE AFTERNOON.
* TRANSPORT WINDS....LIGHT WINDS.
* VENTILATION........FAIR.
FRIDAY NIGHT
* SKY/WEATHER........MOSTLY CLOUDY. CHANCE OF SHOWERS.
* CHANCE OF THUNDER..0%.
* MIN TEMPERATURE....
* VALLEYS..........39-49.
* MID SLOPE........41-51.
* MAX HUMIDITY.......
* VALLEYS..........91-100%.
* MID SLOPE........77-87%.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....DOWNSLOPE 2 TO 5 MPH.
* RIDGE TOP........WEST WINDS 10 TO 15 MPH. GUSTS TO 25 MPH IN THE
EVENING.
* CHC WETTING RAIN...15%.
* MIXING HEIGHT......900-1400 FT AGL DECREASING TO 600-800 FT AGL
AFTER MIDNIGHT.
* TRANSPORT WINDS....SOUTHWEST 10 TO 15 MPH.
* VENTILATION........FAIR.
SATURDAY
* SKY/WEATHER........PARTLY CLOUDY THEN BECOMING MOSTLY CLOUDY.
CHANCE OF SHOWERS IN THE AFTERNOON.
* CHANCE OF THUNDER..0%.
* MAX TEMPERATURE....
* VALLEYS..........62-72.
* MID SLOPE........59-69.
* MIN HUMIDITY.......
* VALLEYS..........45-55%.
* MID SLOPE........44-54%.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....UPSLOPE 4 TO 8 MPH.
* RIDGE TOP........LIGHT WINDS BECOMING WEST 10 TO 15 MPH IN THE
AFTERNOON.
* CHC WETTING RAIN...5%.
* MIXING HEIGHT......600-800 FT AGL INCREASING TO 3800-4800 FT AGL
IN THE AFTERNOON.
* TRANSPORT WINDS....LIGHT WINDS BECOMING WEST 10 TO 15 MPH IN THE
AFTERNOON.
* VENTILATION........MARGINAL INCREASING TO VERY GOOD IN THE
AFTERNOON.
EXTENDED
SATURDAY NIGHT
PARTLY CLOUDY IN THE EVENING THEN CLEARING. SLIGHT
CHANCE OF SHOWERS IN THE EVENING. LOWS 37-47. DOWNSLOPE 2 TO 5 MPH.
SUNDAY
CLEAR. HIGHS 65-75. LOWS 37-47. SLOPE WINDS.
MONDAY
CLEAR. HIGHS 68-78. LOWS 39-49. SLOPE WINDS.
TUESDAY
PARTLY CLOUDY. CHANCE OF SHOWERS AND A SLIGHT CHANCE OF
THUNDERSTORMS. HIGHS 67-77. LOWS 39-49. SLOPE WINDS.
WEDNESDAY THROUGH THURSDAY
PARTLY CLOUDY. SLIGHT CHANCE OF
SHOWERS. HIGHS 62-71. LOWS 36-46.
NVZ423-191515-
WEST HUMBOLDT BASIN IN PERSHING COUNTY-
130 PM PDT THU SEP 18 2025
TONIGHT
* SKY/WEATHER........CLOUDY.
* CHANCE OF THUNDER..0%.
* MIN TEMPERATURE....
* VALLEYS..........55-64.
* MID SLOPE........57-64.
* 24 HR TREND......6 DEGREES WARMER.
* MAX HUMIDITY.......
* VALLEYS..........40-50%.
* MID SLOPE........32-42%.
* 24 HR TREND......19% WETTER.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....DOWNSLOPE 2 TO 5 MPH BECOMING SOUTHWEST 7 TO 12
MPH IN THE LATE EVENING AND OVERNIGHT.
* RIDGE TOP........SOUTHWEST WINDS 10 TO 15 MPH. GUSTS TO 25 MPH
AFTER MIDNIGHT.
* CHC WETTING RAIN...5%.
* MIXING HEIGHT......4100-5100 FT AGL DECREASING TO 600-800 FT AGL
AFTER MIDNIGHT.
* TRANSPORT WINDS....SOUTHWEST 10 TO 15 MPH.
* VENTILATION........VERY GOOD DECREASING TO MARGINAL AFTER
MIDNIGHT.
FRIDAY
* SKY/WEATHER........MOSTLY CLOUDY. SLIGHT CHANCE OF SHOWERS IN THE
AFTERNOON.
* CHANCE OF THUNDER..0%.
* MAX TEMPERATURE....
* VALLEYS..........75-83.
* MID SLOPE........70-80.
* 24 HR TREND......8 DEGREES COOLER.
* MIN HUMIDITY.......
* VALLEYS..........24-34%.
* MID SLOPE........25-35%.
* 24 HR TREND......21% WETTER.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....UPSLOPE 4 TO 8 MPH.
* RIDGE TOP........SOUTH WINDS 10 TO 15 MPH. GUSTS TO 20 MPH IN THE
AFTERNOON.
* CHC WETTING RAIN...5%.
* MIXING HEIGHT......800-1300 FT AGL INCREASING TO 4500-5500 FT AGL
IN THE AFTERNOON.
* TRANSPORT WINDS....SOUTH 10 TO 15 MPH.
* VENTILATION........FAIR INCREASING TO VERY GOOD IN THE AFTERNOON.
FRIDAY NIGHT
* SKY/WEATHER........MOSTLY CLOUDY. SLIGHT CHANCE OF THUNDERSTORMS
IN THE EVENING.
* CHANCE OF THUNDER..10%.
* MIN TEMPERATURE....
* VALLEYS..........52-61.
* MID SLOPE........53-62.
* MAX HUMIDITY.......
* VALLEYS..........71-81%.
* MID SLOPE........58-68%.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....DOWNSLOPE 2 TO 5 MPH.
* RIDGE TOP........SOUTHWEST WINDS 10 TO 15 MPH. GUSTS TO 25 MPH IN
THE LATE EVENING AND OVERNIGHT.
* CHC WETTING RAIN...5%.
* MIXING HEIGHT......2300-3300 FT AGL DECREASING TO 700-1200 FT AGL
AFTER MIDNIGHT.
* TRANSPORT WINDS....SOUTHWEST 10 TO 15 MPH.
* VENTILATION........GOOD DECREASING TO MARGINAL AFTER MIDNIGHT.
SATURDAY
* SKY/WEATHER........MOSTLY CLOUDY THEN BECOMING SUNNY.
* CHANCE OF THUNDER..0%.
* MAX TEMPERATURE....
* VALLEYS..........77-83.
* MID SLOPE........72-82.
* MIN HUMIDITY.......
* VALLEYS..........25-33%.
* MID SLOPE........27-35%.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....UPSLOPE 4 TO 8 MPH BECOMING SOUTHWEST 7 TO 12
MPH IN THE AFTERNOON.
* RIDGE TOP........SOUTHWEST WINDS 10 TO 15 MPH.
* CHC WETTING RAIN...5%.
* MIXING HEIGHT......600-900 FT AGL INCREASING TO 5100-6100 FT AGL
IN THE AFTERNOON.
* TRANSPORT WINDS....LIGHT WINDS BECOMING SOUTHWEST 10 TO 15 MPH IN
THE AFTERNOON.
* VENTILATION........MARGINAL INCREASING TO VERY GOOD IN THE
AFTERNOON.
EXTENDED
SATURDAY NIGHT
PARTLY CLOUDY. LOWS 49-58. DOWNSLOPE 2 TO 5 MPH.
SUNDAY
CLEAR. HIGHS 78-84. LOWS 48-58. SLOPE WINDS.
MONDAY
CLEAR. HIGHS 81-87. LOWS 48-58. SLOPE WINDS.
TUESDAY
PARTLY CLOUDY. SLIGHT CHANCE OF SHOWERS. HIGHS 84-90.
LOWS 48-58. SLOPE WINDS.
WEDNESDAY
PARTLY CLOUDY. SLIGHT CHANCE OF SHOWERS. HIGHS 78-84.
LOWS 48-58.
THURSDAY
PARTLY CLOUDY. HIGHS 75-83.
NVZ429-191515-
LAHONTAN BASIN INCLUDING CHURCHILL AND EASTERN MINERAL COUNTIES-
130 PM PDT THU SEP 18 2025
TONIGHT
* SKY/WEATHER........CLOUDY. SLIGHT CHANCE OF SHOWERS.
* CHANCE OF THUNDER..0%.
* MIN TEMPERATURE....
* VALLEYS..........52-62.
* MID SLOPE........55-65.
* 24 HR TREND......LITTLE CHANGE.
* MAX HUMIDITY.......
* VALLEYS..........56-66%.
* MID SLOPE........37-47%.
* 24 HR TREND......34% WETTER.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....SOUTH WINDS 9 TO 14 MPH.
* RIDGE TOP........SOUTH WINDS 10 TO 20 MPH WITH GUSTS TO 40 MPH.
* CHC WETTING RAIN...5%.
* MIXING HEIGHT......3900-4900 FT AGL DECREASING TO 600-900 FT AGL
AFTER MIDNIGHT.
* TRANSPORT WINDS....SOUTH 15 TO 25 MPH DECREASING TO 10 TO 15 MPH
AFTER MIDNIGHT.
* VENTILATION........EXCELLENT DECREASING TO MARGINAL AFTER
MIDNIGHT.
FRIDAY
* SKY/WEATHER........MOSTLY CLOUDY. CHANCE OF SHOWERS. SLIGHT
CHANCE OF THUNDERSTORMS IN THE AFTERNOON.
* CHANCE OF THUNDER..20%.
* MAX TEMPERATURE....
* VALLEYS..........70-80.
* MID SLOPE........66-76.
* 24 HR TREND......10 DEGREES COOLER.
* MIN HUMIDITY.......
* VALLEYS..........31-41%.
* MID SLOPE........32-42%.
* 24 HR TREND......28% WETTER.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....SOUTH WINDS 7 TO 12 MPH.
* RIDGE TOP........SOUTH WINDS 10 TO 15 MPH WITH GUSTS TO 25 MPH.
* CHC WETTING RAIN...20%.
* MIXING HEIGHT......1000-1500 FT AGL INCREASING TO 3800-4800 FT
AGL IN THE AFTERNOON.
* TRANSPORT WINDS....SOUTH 10 TO 15 MPH.
* VENTILATION........GOOD INCREASING TO VERY GOOD IN THE AFTERNOON.
FRIDAY NIGHT
* SKY/WEATHER........MOSTLY CLOUDY THEN BECOMING PARTLY CLOUDY.
SLIGHT CHANCE OF THUNDERSTORMS IN THE EVENING.
* CHANCE OF THUNDER..20%.
* MIN TEMPERATURE....
* VALLEYS..........51-61.
* MID SLOPE........51-61.
* MAX HUMIDITY.......
* VALLEYS..........75-85%.
* MID SLOPE........64-74%.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....WEST WINDS 7 TO 12 MPH IN THE EVENING BECOMING
DOWNSLOPE 2 TO 5 MPH.
* RIDGE TOP........LIGHT WINDS.
* CHC WETTING RAIN...10%.
* MIXING HEIGHT......1600-2100 FT AGL DECREASING TO 600-1100 FT AGL
AFTER MIDNIGHT.
* TRANSPORT WINDS....WEST 10 TO 15 MPH.
* VENTILATION........GOOD DECREASING TO MARGINAL AFTER MIDNIGHT.
SATURDAY
* SKY/WEATHER........PARTLY CLOUDY THEN BECOMING SUNNY.
* CHANCE OF THUNDER..0%.
* MAX TEMPERATURE....
* VALLEYS..........74-84.
* MID SLOPE........70-80.
* MIN HUMIDITY.......
* VALLEYS..........25-35%.
* MID SLOPE........29-39%.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....UPSLOPE 4 TO 8 MPH.
* RIDGE TOP........SOUTHWEST WINDS 10 TO 15 MPH.
* CHC WETTING RAIN...5%.
* MIXING HEIGHT......600-900 FT AGL INCREASING TO 4900-5900 FT AGL
IN THE AFTERNOON.
* TRANSPORT WINDS....LIGHT WINDS.
* VENTILATION........POOR INCREASING TO VERY GOOD IN THE AFTERNOON.
EXTENDED
SATURDAY NIGHT
PARTLY CLOUDY. LOWS 49-59. DOWNSLOPE 2 TO 5 MPH.
SUNDAY
CLEAR. HIGHS 75-85. LOWS 49-59. SLOPE WINDS.
MONDAY
CLEAR. HIGHS 79-89. LOWS 49-59. SLOPE WINDS.
TUESDAY
PARTLY CLOUDY. SLIGHT CHANCE OF SHOWERS. HIGHS 80-90.
LOWS 49-59. SOUTH WINDS 10 TO 15 MPH.
WEDNESDAY THROUGH THURSDAY
PARTLY CLOUDY. HIGHS 75-85. LOWS
48-58.
CAZ270-278-NVZ458-191515-
SURPRISE VALLEY CALIFORNIA-EASTERN LASSEN COUNTY-
NORTHERN WASHOE COUNTY-
130 PM PDT THU SEP 18 2025
TONIGHT
* SKY/WEATHER........CLOUDY.
* CHANCE OF THUNDER..0%.
* MIN TEMPERATURE....
* VALLEYS..........48-58.
* MID SLOPE........51-61.
* 24 HR TREND......LITTLE CHANGE.
* MAX HUMIDITY.......
* VALLEYS..........50-60%.
* MID SLOPE........38-48%.
* 24 HR TREND......19% WETTER.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....SOUTHWEST WINDS 7 TO 12 MPH.
* RIDGE TOP........LIGHT WINDS BECOMING WEST 10 TO 15 MPH WITH
GUSTS TO 25 MPH AFTER MIDNIGHT.
* CHC WETTING RAIN...5%.
* MIXING HEIGHT......4400-5400 FT AGL DECREASING TO 600-800 FT AGL
AFTER MIDNIGHT.
* TRANSPORT WINDS....SOUTHWEST 10 TO 15 MPH.
* VENTILATION........VERY GOOD DECREASING TO MARGINAL AFTER
MIDNIGHT.
FRIDAY
* SKY/WEATHER........CLOUDY. SLIGHT CHANCE OF SHOWERS.
* CHANCE OF THUNDER..0%.
* MAX TEMPERATURE....
* VALLEYS..........70-80.
* MID SLOPE........67-77.
* 24 HR TREND......10 DEGREES COOLER.
* MIN HUMIDITY.......
* VALLEYS..........22-32%.
* MID SLOPE........21-31%.
* 24 HR TREND......20% WETTER.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....UPSLOPE 4 TO 8 MPH.
* RIDGE TOP........LIGHT WINDS BECOMING NORTH 10 TO 15 MPH WITH
GUSTS TO 25 MPH IN THE LATE MORNING AND EARLY
AFTERNOON, THEN SHIFTING TO THE SOUTHEAST WITH
GUSTS TO 25 MPH LATE IN THE AFTERNOON.
* CHC WETTING RAIN...5%.
* MIXING HEIGHT......600-1100 FT AGL INCREASING TO 3500-4500 FT AGL
IN THE AFTERNOON.
* TRANSPORT WINDS....NORTHWEST 10 TO 15 MPH SHIFTING TO THE
SOUTHEAST IN THE AFTERNOON.
* VENTILATION........FAIR INCREASING TO VERY GOOD IN THE AFTERNOON.
FRIDAY NIGHT
* SKY/WEATHER........MOSTLY CLOUDY. SLIGHT CHANCE OF SHOWERS IN THE
EVENING.
* CHANCE OF THUNDER..0%.
* MIN TEMPERATURE....
* VALLEYS..........45-55.
* MID SLOPE........46-56.
* MAX HUMIDITY.......
* VALLEYS..........76-86%.
* MID SLOPE........63-73%.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....WEST WINDS 7 TO 12 MPH UNTIL EARLY MORNING
BECOMING DOWNSLOPE 2 TO 5 MPH.
* RIDGE TOP........WEST WINDS 10 TO 15 MPH WITH GUSTS TO 25 MPH.
* CHC WETTING RAIN...5%.
* MIXING HEIGHT......2400-3400 FT AGL DECREASING TO 600-1100 FT AGL
AFTER MIDNIGHT.
* TRANSPORT WINDS....LIGHT WINDS.
* VENTILATION........GOOD DECREASING TO MARGINAL AFTER MIDNIGHT.
SATURDAY
* SKY/WEATHER........MOSTLY CLOUDY THEN BECOMING PARTLY CLOUDY.
SLIGHT CHANCE OF SHOWERS IN THE AFTERNOON.
* CHANCE OF THUNDER..0%.
* MAX TEMPERATURE....
* VALLEYS..........72-82.
* MID SLOPE........69-77.
* MIN HUMIDITY.......
* VALLEYS..........25-35%.
* MID SLOPE........29-39%.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....UPSLOPE 4 TO 8 MPH BECOMING WEST 5 TO 10 MPH
LATE IN THE AFTERNOON.
* RIDGE TOP........WEST WINDS 10 TO 15 MPH.
* CHC WETTING RAIN...5%.
* MIXING HEIGHT......600-1000 FT AGL INCREASING TO 4100-5100 FT AGL
IN THE AFTERNOON.
* TRANSPORT WINDS....SOUTHWEST 10 TO 15 MPH.
* VENTILATION........MARGINAL INCREASING TO VERY GOOD IN THE
AFTERNOON.
EXTENDED
SATURDAY NIGHT
PARTLY CLOUDY IN THE EVENING THEN CLEARING. LOWS
41-51. WEST WINDS 8 TO 13 MPH UNTIL EARLY MORNING BECOMING DOWNSLOPE
2 TO 5 MPH.
SUNDAY
CLEAR. HIGHS 74-84. LOWS 39-49. SLOPE WINDS.
MONDAY
CLEAR. HIGHS 77-87. LOWS 39-49. SLOPE WINDS.
TUESDAY
PARTLY CLOUDY. SLIGHT CHANCE OF SHOWERS. HIGHS 77-87.
LOWS 43-53. SLOPE WINDS.
WEDNESDAY THROUGH THURSDAY
PARTLY CLOUDY. SLIGHT CHANCE OF
SHOWERS. HIGHS 71-81. LOWS 41-51.
CAZ271-191515-
WESTERN LASSEN, EASTERN PLUMAS, AND EASTERN SIERRA COUNTIES-
130 PM PDT THU SEP 18 2025
TONIGHT
* SKY/WEATHER........CLOUDY. CHANCE OF SHOWERS AFTER MIDNIGHT.
* CHANCE OF THUNDER..0%.
* MIN TEMPERATURE....
* VALLEYS..........42-52.
* MID SLOPE........47-57.
* 24 HR TREND......LITTLE CHANGE.
* MAX HUMIDITY.......
* VALLEYS..........70-80%.
* MID SLOPE........55-65%.
* 24 HR TREND......32% WETTER.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....DOWNSLOPE 2 TO 5 MPH.
* RIDGE TOP........LIGHT WINDS BECOMING SOUTH 10 TO 15 MPH AFTER
MIDNIGHT. GUSTS TO 25 MPH AFTER MIDNIGHT.
* CHC WETTING RAIN...15%.
* MIXING HEIGHT......3500-4500 FT AGL DECREASING TO 600-800 FT AGL
AFTER MIDNIGHT.
* TRANSPORT WINDS....SOUTHWEST 10 TO 15 MPH.
* VENTILATION........EXCELLENT DECREASING TO MARGINAL AFTER
MIDNIGHT.
FRIDAY
* SKY/WEATHER........CLOUDY. CHANCE OF SHOWERS. SLIGHT CHANCE OF
THUNDERSTORMS IN THE AFTERNOON.
* CHANCE OF THUNDER..10%.
* MAX TEMPERATURE....
* VALLEYS..........64-74.
* MID SLOPE........61-71.
* 24 HR TREND......14 DEGREES COOLER.
* MIN HUMIDITY.......
* VALLEYS..........31-41%.
* MID SLOPE........34-44%.
* 24 HR TREND......34% WETTER.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....UPSLOPE 4 TO 8 MPH.
* RIDGE TOP........SOUTHEAST WINDS 10 TO 15 MPH WITH GUSTS TO 25
MPH UNTIL LATE AFTERNOON BECOMING LIGHT.
* CHC WETTING RAIN...25%.
* MIXING HEIGHT......700-1200 FT AGL INCREASING TO 2200-3200 FT AGL
IN THE AFTERNOON.
* TRANSPORT WINDS....NORTHEAST 10 TO 15 MPH.
* VENTILATION........FAIR INCREASING TO GOOD IN THE AFTERNOON.
FRIDAY NIGHT
* SKY/WEATHER........MOSTLY CLOUDY. CHANCE OF SHOWERS IN THE
EVENING.
* CHANCE OF THUNDER..0%.
* MIN TEMPERATURE....
* VALLEYS..........39-49.
* MID SLOPE........44-54.
* MAX HUMIDITY.......
* VALLEYS..........83-93%.
* MID SLOPE........75-85%.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....DOWNSLOPE 2 TO 5 MPH.
* RIDGE TOP........LIGHT WINDS.
* CHC WETTING RAIN...10%.
* MIXING HEIGHT......700-1200 FT AGL.
* TRANSPORT WINDS....LIGHT WINDS.
* VENTILATION........MARGINAL.
SATURDAY
* SKY/WEATHER........PARTLY CLOUDY. SLIGHT CHANCE OF THUNDERSTORMS
IN THE AFTERNOON.
* CHANCE OF THUNDER..20%.
* MAX TEMPERATURE....
* VALLEYS..........68-78.
* MID SLOPE........66-74.
* MIN HUMIDITY.......
* VALLEYS..........36-46%.
* MID SLOPE........38-48%.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....UPSLOPE 4 TO 8 MPH.
* RIDGE TOP........SOUTHWEST WINDS 10 TO 15 MPH.
* CHC WETTING RAIN...5%.
* MIXING HEIGHT......600-900 FT AGL INCREASING TO 4100-5100 FT AGL
IN THE AFTERNOON.
* TRANSPORT WINDS....LIGHT WINDS BECOMING WEST 10 TO 15 MPH IN THE
AFTERNOON.
* VENTILATION........POOR INCREASING TO EXCELLENT IN THE AFTERNOON.
EXTENDED
SATURDAY NIGHT
PARTLY CLOUDY IN THE EVENING THEN CLEARING. LOWS
35-45. WEST WINDS 5 TO 10 MPH IN THE EVENING BECOMING DOWNSLOPE 2 TO
5 MPH.
SUNDAY
CLEAR. HIGHS 71-81. LOWS 35-45. SLOPE WINDS.
MONDAY
CLEAR. HIGHS 76-86. LOWS 36-46. SLOPE WINDS.
TUESDAY
PARTLY CLOUDY. SLIGHT CHANCE OF THUNDERSTORMS. HIGHS
74-84. LOWS 38-48. SLOPE WINDS.
WEDNESDAY THROUGH THURSDAY
PARTLY CLOUDY. SLIGHT CHANCE OF
SHOWERS. HIGHS 67-77. LOWS 35-45.
CAZ274-191515-
SOUTHERN MONO COUNTY-
130 PM PDT THU SEP 18 2025
TONIGHT
* SKY/WEATHER........MOSTLY CLOUDY. CHANCE OF SHOWERS.
* CHANCE OF THUNDER..0%.
* MIN TEMPERATURE....
* VALLEYS..........38-48.
* MID SLOPE........39-49.
* 24 HR TREND......4 DEGREES COOLER.
* MAX HUMIDITY.......
* VALLEYS..........87-97%.
* MID SLOPE........75-85%.
* 24 HR TREND......47% WETTER.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....SOUTHEAST WINDS 7 TO 12 MPH WITH GUSTS TO 20 MPH
IN THE EVENING BECOMING DOWNSLOPE 2 TO 5 MPH.
* RIDGE TOP........SOUTHEAST WINDS 10 TO 20 MPH WITH GUSTS TO 35
MPH.
* CHC WETTING RAIN...25%.
* MIXING HEIGHT......1500-2000 FT AGL DECREASING TO 600-1100 FT AGL
AFTER MIDNIGHT.
* TRANSPORT WINDS....SOUTHEAST 10 TO 15 MPH.
* VENTILATION........GOOD DECREASING TO MARGINAL AFTER MIDNIGHT.
FRIDAY
* SKY/WEATHER........CHANCE OF SHOWERS IN THE MORNING, THEN SHOWERS
LIKELY AND A SLIGHT CHANCE OF THUNDERSTORMS IN
THE AFTERNOON.
* CHANCE OF THUNDER..20%.
* MAX TEMPERATURE....
* VALLEYS..........60-70.
* MID SLOPE........56-66.
* 24 HR TREND......7 DEGREES COOLER.
* MIN HUMIDITY.......
* VALLEYS..........41-51%.
* MID SLOPE........45-55%.
* 24 HR TREND......29% WETTER.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....UPSLOPE 4 TO 8 MPH.
* RIDGE TOP........SOUTH WINDS 10 TO 15 MPH WITH GUSTS TO 30 MPH.
* CHC WETTING RAIN...30%.
* MIXING HEIGHT......900-1400 FT AGL INCREASING TO 1700-2200 FT AGL
IN THE AFTERNOON.
* TRANSPORT WINDS....SOUTH 10 TO 15 MPH.
* VENTILATION........FAIR INCREASING TO GOOD IN THE AFTERNOON.
FRIDAY NIGHT
* SKY/WEATHER........MOSTLY CLOUDY THEN BECOMING PARTLY CLOUDY.
CHANCE OF SHOWERS AND A SLIGHT CHANCE OF
THUNDERSTORMS IN THE EVENING.
* CHANCE OF THUNDER..20%.
* MIN TEMPERATURE....
* VALLEYS..........35-45.
* MID SLOPE........38-48.
* MAX HUMIDITY.......
* VALLEYS..........84-94%.
* MID SLOPE........70-80%.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....DOWNSLOPE 2 TO 5 MPH.
* RIDGE TOP........LIGHT WINDS.
* CHC WETTING RAIN...5%.
* MIXING HEIGHT......1700-2700 FT AGL DECREASING TO 600-1000 FT AGL
AFTER MIDNIGHT.
* TRANSPORT WINDS....LIGHT WINDS.
* VENTILATION........GOOD DECREASING TO MARGINAL AFTER MIDNIGHT.
SATURDAY
* SKY/WEATHER........PARTLY CLOUDY. SLIGHT CHANCE OF SHOWERS IN THE
AFTERNOON.
* CHANCE OF THUNDER..0%.
* MAX TEMPERATURE....
* VALLEYS..........65-75.
* MID SLOPE........61-71.
* MIN HUMIDITY.......
* VALLEYS..........27-37%.
* MID SLOPE........30-40%.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....UPSLOPE 4 TO 8 MPH.
* RIDGE TOP........SOUTHWEST WINDS 10 TO 15 MPH.
* CHC WETTING RAIN...5%.
* MIXING HEIGHT......600-1000 FT AGL INCREASING TO 4000-5000 FT AGL
IN THE AFTERNOON.
* TRANSPORT WINDS....LIGHT WINDS.
* VENTILATION........POOR INCREASING TO GOOD IN THE AFTERNOON.
EXTENDED
SATURDAY NIGHT
PARTLY CLOUDY. SLIGHT CHANCE OF SHOWERS IN THE
EVENING. LOWS 37-47. DOWNSLOPE 2 TO 5 MPH.
SUNDAY
PARTLY CLOUDY. SLIGHT CHANCE OF SHOWERS. HIGHS 66-76. LOWS
37-47. SLOPE WINDS.
MONDAY
CLEAR. HIGHS 69-79. LOWS 37-47. SLOPE WINDS.
TUESDAY
PARTLY CLOUDY. SLIGHT CHANCE OF THUNDERSTORMS. HIGHS
68-78. LOWS 38-48. SLOPE WINDS.
WEDNESDAY
PARTLY CLOUDY. SLIGHT CHANCE OF SHOWERS. HIGHS 66-76.
LOWS 35-45.
THURSDAY
PARTLY CLOUDY. HIGHS 65-75.
.8 TO 14 DAY OUTLOOK FOR (FRI SEP 26 THROUGH THU OCT 2)
NEAR NORMAL TEMPERATURES AND PRECIPITATION.
=
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