422
FNUS55 KREV 201207
FWFREV
FIRE WEATHER PLANNING FORECAST
NATIONAL WEATHER SERVICE RENO NV
507 AM PDT WED MAY 20 2026
DISCUSSION
A WARMING AND DRYING TREND CONTINUES THIS WEEK WITH MINIMUM RHS
MOSTLY IN THE LOW TEENS IN WESTERN NV AND TEENS TO LOWER 20S IN THE
SIERRA. W-SW AFTERNOON BREEZES RETURN THIS AFTERNOON WITH GUSTS
AROUND 20 MPH. PRECIPITATION CHANCES REMAIN LOW, THOUGH TERRAIN-
DRIVEN THUNDER CHANCES RISE TO 5-15% THURSDAY INTO MEMORIAL DAY
WEEKEND.
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
NVZ420-210030-
NORTHERN SIERRA FRONT INCLUDING CARSON CITY, DOUGLAS, STOREY,
SOUTHERN WASHOE, WESTERN LYON, AND FAR SOUTHERN LASSEN COUNTIES-
507 AM PDT WED MAY 20 2026
TODAY
* SKY/WEATHER........PARTLY CLOUDY.
* CHANCE OF THUNDER..0%.
* CHC WETTING RAIN...0%.
* MAX TEMPERATURE....
* VALLEYS..........70-80.
* MID SLOPE........67-77.
* 24 HR TREND......7 DEGREES WARMER.
* MIN HUMIDITY.......
* VALLEYS..........8-18%.
* MID SLOPE........11-19%.
* 24 HR TREND......4% WETTER.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....UPSLOPE 4 TO 8 MPH.
* RIDGE TOP........LIGHT WINDS.
* MIXING HEIGHT......2800-3800 FT AGL INCREASING TO 8200-9200 FT
AGL IN THE AFTERNOON.
* TRANSPORT WINDS....LIGHT WINDS.
* VENTILATION........FAIR INCREASING TO VERY GOOD IN THE AFTERNOON.
TONIGHT
* SKY/WEATHER........PARTLY CLOUDY THEN BECOMING CLEAR.
* CHANCE OF THUNDER..0%.
* CHC WETTING RAIN...0%.
* MIN TEMPERATURE....
* VALLEYS..........41-51.
* MID SLOPE........44-54.
* 24 HR TREND......5 DEGREES WARMER.
* MAX HUMIDITY.......
* VALLEYS..........42-52%.
* MID SLOPE........34-44%.
* 24 HR TREND......12% WETTER.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....WEST WINDS 8 TO 13 MPH UNTIL EARLY MORNING
BECOMING DOWNSLOPE 2 TO 5 MPH.
* RIDGE TOP........NORTHWEST WINDS 10 TO 15 MPH WITH GUSTS TO 25
MPH.
* MIXING HEIGHT......4900-5900 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...5%.
* MAX TEMPERATURE....
* VALLEYS..........73-83.
* MID SLOPE........70-80.
* MIN HUMIDITY.......
* VALLEYS..........10-20%.
* MID SLOPE........15-23%.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....UPSLOPE 4 TO 8 MPH BECOMING NORTH 8 TO 13 MPH IN
THE LATE MORNING AND AFTERNOON.
* RIDGE TOP........NORTH WINDS 10 TO 15 MPH.
* MIXING HEIGHT......2500-3500 FT AGL INCREASING TO 7900-8900 FT
AGL IN THE AFTERNOON.
* TRANSPORT WINDS....NORTH 10 TO 15 MPH.
* VENTILATION........GOOD INCREASING TO EXCELLENT IN THE AFTERNOON.
EXTENDED
THURSDAY NIGHT
PARTLY CLOUDY. LOWS 44-54. NORTHWEST WINDS 8 TO
13 MPH IN THE EVENING BECOMING DOWNSLOPE 2 TO 5 MPH.
FRIDAY
CLEAR. HIGHS 75-85. LOWS 44-54. NORTHWEST WINDS 10 TO
15 MPH.
SATURDAY THROUGH SUNDAY
CLEAR. HIGHS 77-87. LOWS 43-53. WEST
WINDS 10 TO 15 MPH.
MEMORIAL DAY
CLEAR. HIGHS 77-87. LOWS 42-52.
TUESDAY
SUNNY, BREEZY. HIGHS 65-75.
NVZ421-210030-
SOUTHERN SIERRA FRONT INCLUDING ALPINE, NORTHERN MONO, SOUTHERN
LYON, AND WESTERN MINERAL COUNTIES-
507 AM PDT WED MAY 20 2026
TODAY
* SKY/WEATHER........SUNNY THEN BECOMING PARTLY CLOUDY.
* CHANCE OF THUNDER..0%.
* CHC WETTING RAIN...0%.
* MAX TEMPERATURE....
* VALLEYS..........67-77.
* MID SLOPE........61-71.
* 24 HR TREND......7 DEGREES WARMER.
* MIN HUMIDITY.......
* VALLEYS..........9-19%.
* MID SLOPE........9-19%.
* 24 HR TREND......LITTLE CHANGE.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....UPSLOPE 4 TO 8 MPH BECOMING NORTHWEST 5 TO 10
MPH LATE IN THE AFTERNOON.
* RIDGE TOP........WEST WINDS 10 TO 15 MPH.
* MIXING HEIGHT......2600-3600 FT AGL INCREASING TO 7800-8800 FT
AGL IN THE AFTERNOON.
* TRANSPORT WINDS....LIGHT WINDS.
* VENTILATION........FAIR INCREASING TO VERY GOOD IN THE AFTERNOON.
TONIGHT
* SKY/WEATHER........PARTLY CLOUDY THEN BECOMING CLEAR.
* CHANCE OF THUNDER..0%.
* CHC WETTING RAIN...0%.
* MIN TEMPERATURE....
* VALLEYS..........34-44.
* MID SLOPE........44-54.
* 24 HR TREND......6 DEGREES WARMER.
* MAX HUMIDITY.......
* VALLEYS..........44-54%.
* MID SLOPE........28-38%.
* 24 HR TREND......14% WETTER.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....NORTHWEST WINDS 8 TO 13 MPH IN THE EVENING
BECOMING DOWNSLOPE 2 TO 5 MPH.
* RIDGE TOP........LIGHT WINDS BECOMING NORTH 10 TO 15 MPH AFTER
MIDNIGHT. GUSTS TO 25 MPH IN THE EVENING.
* 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.
THURSDAY
* SKY/WEATHER........SUNNY.
* CHANCE OF THUNDER..0%.
* CHC WETTING RAIN...5%.
* MAX TEMPERATURE....
* VALLEYS..........70-80.
* MID SLOPE........64-74.
* MIN HUMIDITY.......
* VALLEYS..........13-23%.
* MID SLOPE........12-22%.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....UPSLOPE 4 TO 8 MPH BECOMING NORTH 9 TO 14 MPH IN
THE AFTERNOON.
* RIDGE TOP........LIGHT WINDS BECOMING NORTHWEST 10 TO 15 MPH WITH
GUSTS TO 25 MPH IN THE AFTERNOON.
* MIXING HEIGHT......2600-3600 FT AGL INCREASING TO 8600-9600 FT
AGL IN THE AFTERNOON.
* TRANSPORT WINDS....NORTHWEST 10 TO 15 MPH.
* VENTILATION........GOOD INCREASING TO EXCELLENT IN THE AFTERNOON.
EXTENDED
THURSDAY NIGHT
PARTLY CLOUDY. SLIGHT CHANCE OF SHOWERS IN THE
EVENING. LOWS 37-47. NORTHWEST WINDS 9 TO 14 MPH IN THE EVENING
BECOMING DOWNSLOPE 2 TO 5 MPH.
FRIDAY
MOSTLY CLEAR. SLIGHT CHANCE OF SHOWERS. HIGHS 71-81. LOWS 37-47.
WEST WINDS 10 TO 15 MPH.
SATURDAY
CLEAR. HIGHS 74-84. LOWS 37-47. SOUTHWEST WINDS 10 TO
15 MPH.
SUNDAY
PARTLY CLOUDY. SLIGHT CHANCE OF SHOWERS. HIGHS 74-84. LOWS
37-47. SOUTHWEST WINDS 10 TO 15 MPH.
MEMORIAL DAY
CLEAR. HIGHS 74-84. LOWS 36-46.
TUESDAY
SUNNY, BREEZY. HIGHS 65-75.
CAZ272-210030-
GREATER LAKE TAHOE AND TRUCKEE AREA-
507 AM PDT WED MAY 20 2026
TODAY
* SKY/WEATHER........SUNNY THEN BECOMING PARTLY CLOUDY.
* CHANCE OF THUNDER..0%.
* CHC WETTING RAIN...0%.
* MAX TEMPERATURE....
* VALLEYS..........62-72.
* MID SLOPE........59-69.
* 24 HR TREND......5 DEGREES WARMER.
* MIN HUMIDITY.......
* VALLEYS..........17-27%.
* MID SLOPE........17-27%.
* 24 HR TREND......8% WETTER.
* 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. GUSTS TO 20 MPH
LATE IN THE AFTERNOON.
* MIXING HEIGHT......2500-3500 FT AGL INCREASING TO 6500-7500 FT
AGL IN THE AFTERNOON.
* TRANSPORT WINDS....LIGHT WINDS.
* VENTILATION........FAIR INCREASING TO VERY GOOD IN THE AFTERNOON.
TONIGHT
* SKY/WEATHER........CLEAR.
* CHANCE OF THUNDER..0%.
* CHC WETTING RAIN...0%.
* MIN TEMPERATURE....
* VALLEYS..........35-45.
* MID SLOPE........37-47.
* 24 HR TREND......LITTLE CHANGE.
* MAX HUMIDITY.......
* VALLEYS..........66-76%.
* MID SLOPE........41-51%.
* 24 HR TREND......13% WETTER.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....WEST WINDS 5 TO 10 MPH IN THE EVENING BECOMING
DOWNSLOPE 2 TO 5 MPH.
* RIDGE TOP........LIGHT WINDS. GUSTS TO 25 MPH IN THE EVENING.
* MIXING HEIGHT......3600-4600 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.
THURSDAY
* SKY/WEATHER........SUNNY.
* CHANCE OF THUNDER..0%.
* CHC WETTING RAIN...0%.
* MAX TEMPERATURE....
* VALLEYS..........65-75.
* MID SLOPE........63-73.
* MIN HUMIDITY.......
* VALLEYS..........20-30%.
* MID SLOPE........20-30%.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....UPSLOPE 4 TO 8 MPH.
* RIDGE TOP........NORTH WINDS 10 TO 15 MPH.
* MIXING HEIGHT......2400-3400 FT AGL INCREASING TO 7000-8000 FT
AGL IN THE AFTERNOON.
* TRANSPORT WINDS....NORTH 10 TO 15 MPH.
* VENTILATION........GOOD INCREASING TO VERY GOOD IN THE AFTERNOON.
EXTENDED
THURSDAY NIGHT
PARTLY CLOUDY IN THE EVENING THEN CLEARING. LOWS
37-47. DOWNSLOPE 2 TO 5 MPH.
FRIDAY
MOSTLY CLEAR. SLIGHT CHANCE OF SHOWERS. HIGHS 65-75. LOWS 37-47.
SLOPE WINDS.
SATURDAY THROUGH SUNDAY
CLEAR. HIGHS 67-77. LOWS 36-46. SLOPE
WINDS.
MEMORIAL DAY
CLEAR. HIGHS 66-76. LOWS 36-46.
TUESDAY
MOSTLY SUNNY. SLIGHT CHANCE OF SHOWERS. HIGHS 56-65.
NVZ423-210030-
WEST HUMBOLDT BASIN IN PERSHING COUNTY-
507 AM PDT WED MAY 20 2026
TODAY
* SKY/WEATHER........PARTLY CLOUDY.
* CHANCE OF THUNDER..0%.
* CHC WETTING RAIN...0%.
* MAX TEMPERATURE....
* VALLEYS..........74-82.
* MID SLOPE........69-79.
* 24 HR TREND......7 DEGREES WARMER.
* MIN HUMIDITY.......
* VALLEYS..........10-15%.
* MID SLOPE........11-16%.
* 24 HR TREND......LITTLE CHANGE.
* 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.
* MIXING HEIGHT......3100-4100 FT AGL INCREASING TO 9300-10300 FT
AGL IN THE AFTERNOON.
* TRANSPORT WINDS....LIGHT WINDS.
* VENTILATION........GOOD INCREASING TO VERY GOOD IN THE AFTERNOON.
TONIGHT
* SKY/WEATHER........PARTLY CLOUDY.
* CHANCE OF THUNDER..0%.
* CHC WETTING RAIN...0%.
* MIN TEMPERATURE....
* VALLEYS..........44-54.
* MID SLOPE........45-55.
* 24 HR TREND......7 DEGREES WARMER.
* MAX HUMIDITY.......
* VALLEYS..........34-44%.
* MID SLOPE........25-35%.
* 24 HR TREND......6% WETTER.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....DOWNSLOPE 2 TO 5 MPH.
* RIDGE TOP........NORTH WINDS 10 TO 15 MPH. GUSTS TO 25 MPH IN THE
MORNING.
* MIXING HEIGHT......5100-6100 FT AGL IN THE EVENING THEN 200-500
FT AGL.
* TRANSPORT WINDS....NORTHWEST 10 TO 15 MPH.
* VENTILATION........EXCELLENT DECREASING TO POOR AFTER MIDNIGHT.
THURSDAY
* SKY/WEATHER........PARTLY CLOUDY THEN BECOMING SUNNY.
* CHANCE OF THUNDER..0%.
* CHC WETTING RAIN...0%.
* MAX TEMPERATURE....
* VALLEYS..........76-84.
* MID SLOPE........70-80.
* MIN HUMIDITY.......
* VALLEYS..........11-16%.
* MID SLOPE........12-17%.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....NORTH WINDS 9 TO 14 MPH.
* RIDGE TOP........NORTH WINDS 10 TO 20 MPH WITH GUSTS TO 35 MPH.
* MIXING HEIGHT......2400-3400 FT AGL INCREASING TO 8400-9400 FT
AGL IN THE AFTERNOON.
* TRANSPORT WINDS....NORTH 10 TO 15 MPH.
* VENTILATION........VERY GOOD INCREASING TO EXCELLENT IN THE
AFTERNOON.
EXTENDED
THURSDAY NIGHT
PARTLY CLOUDY. LOWS 42-52. NORTH WINDS 9 TO
14 MPH.
FRIDAY
CLEAR. HIGHS 79-87. LOWS 42-52. SLOPE WINDS.
SATURDAY THROUGH SUNDAY
CLEAR. HIGHS 83-92. LOWS 47-57. WEST
WINDS 10 TO 15 MPH.
MEMORIAL DAY
CLEAR. HIGHS 84-92. LOWS 44-54.
TUESDAY
SUNNY, BREEZY. HIGHS 70-78.
NVZ429-210030-
LAHONTAN BASIN INCLUDING CHURCHILL AND EASTERN MINERAL COUNTIES-
507 AM PDT WED MAY 20 2026
TODAY
* SKY/WEATHER........PARTLY CLOUDY.
* CHANCE OF THUNDER..0%.
* CHC WETTING RAIN...0%.
* MAX TEMPERATURE....
* VALLEYS..........71-81.
* MID SLOPE........67-77.
* 24 HR TREND......7 DEGREES WARMER.
* MIN HUMIDITY.......
* VALLEYS..........9-14%.
* MID SLOPE........10-15%.
* 24 HR TREND......LITTLE CHANGE.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....UPSLOPE 4 TO 8 MPH.
* RIDGE TOP........SOUTHWEST WINDS 10 TO 15 MPH SHIFTING TO THE
NORTHWEST IN THE AFTERNOON.
* MIXING HEIGHT......2800-3800 FT AGL INCREASING TO 8600-9600 FT
AGL IN THE AFTERNOON.
* TRANSPORT WINDS....LIGHT WINDS.
* VENTILATION........FAIR INCREASING TO VERY GOOD IN THE AFTERNOON.
TONIGHT
* SKY/WEATHER........PARTLY CLOUDY THEN BECOMING CLEAR.
* CHANCE OF THUNDER..0%.
* CHC WETTING RAIN...0%.
* MIN TEMPERATURE....
* VALLEYS..........42-52.
* MID SLOPE........46-56.
* 24 HR TREND......7 DEGREES WARMER.
* MAX HUMIDITY.......
* VALLEYS..........32-42%.
* MID SLOPE........24-34%.
* 24 HR TREND......8% WETTER.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....NORTH WINDS 7 TO 12 MPH IN THE EVENING BECOMING
DOWNSLOPE 2 TO 5 MPH.
* RIDGE TOP........LIGHT WINDS. GUSTS TO 20 MPH AFTER MIDNIGHT.
* MIXING HEIGHT......4800-5800 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.
THURSDAY
* SKY/WEATHER........SUNNY.
* CHANCE OF THUNDER..0%.
* CHC WETTING RAIN...0%.
* MAX TEMPERATURE....
* VALLEYS..........74-84.
* MID SLOPE........70-80.
* MIN HUMIDITY.......
* VALLEYS..........11-17%.
* MID SLOPE........12-18%.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....UPSLOPE 4 TO 8 MPH BECOMING NORTH 9 TO 15 MPH
WITH GUSTS TO 25 MPH IN THE LATE MORNING AND
AFTERNOON.
* RIDGE TOP........NORTH WINDS 10 TO 20 MPH. GUSTS TO 30 MPH IN THE
LATE MORNING AND AFTERNOON.
* MIXING HEIGHT......2800-3800 FT AGL INCREASING TO 10100-11100 FT
AGL IN THE AFTERNOON.
* TRANSPORT WINDS....NORTHWEST 10 TO 15 MPH.
* VENTILATION........VERY GOOD INCREASING TO EXCELLENT IN THE
AFTERNOON.
EXTENDED
THURSDAY NIGHT
PARTLY CLOUDY. LOWS 44-54. NORTH WINDS 9 TO 15 MPH
UNTIL EARLY MORNING BECOMING DOWNSLOPE 2 TO 5 MPH.
FRIDAY
CLEAR. HIGHS 76-86. LOWS 44-54. NORTHWEST WINDS 10 TO
15 MPH.
SATURDAY
CLEAR. HIGHS 80-90. LOWS 46-56. WEST WINDS 10 TO 15 MPH.
SUNDAY
MOSTLY CLEAR. SLIGHT CHANCE OF SHOWERS. HIGHS 80-90. LOWS 48-58.
WEST WINDS 10 TO 15 MPH.
MEMORIAL DAY
CLEAR. HIGHS 81-91. LOWS 44-54.
TUESDAY
SUNNY. HIGHS 71-81.
CAZ270-278-NVZ458-210030-
SURPRISE VALLEY CALIFORNIA-EASTERN LASSEN COUNTY-
NORTHERN WASHOE COUNTY-
507 AM PDT WED MAY 20 2026
TODAY
* SKY/WEATHER........PARTLY CLOUDY.
* CHANCE OF THUNDER..0%.
* CHC WETTING RAIN...0%.
* MAX TEMPERATURE....
* VALLEYS..........71-81.
* MID SLOPE........67-75.
* 24 HR TREND......6 DEGREES WARMER.
* MIN HUMIDITY.......
* VALLEYS..........10-20%.
* MID SLOPE........15-25%.
* 24 HR TREND......4% WETTER.
* 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.
* MIXING HEIGHT......2400-3400 FT AGL INCREASING TO 8600-9600 FT
AGL IN THE AFTERNOON.
* TRANSPORT WINDS....LIGHT WINDS.
* VENTILATION........FAIR INCREASING TO VERY GOOD IN THE AFTERNOON.
TONIGHT
* SKY/WEATHER........PARTLY CLOUDY.
* CHANCE OF THUNDER..0%.
* CHC WETTING RAIN...0%.
* MIN TEMPERATURE....
* VALLEYS..........39-49.
* MID SLOPE........43-53.
* 24 HR TREND......6 DEGREES WARMER.
* MAX HUMIDITY.......
* VALLEYS..........50-60%.
* MID SLOPE........39-49%.
* 24 HR TREND......6% WETTER.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....NORTHWEST WINDS 9 TO 14 MPH.
* RIDGE TOP........NORTHWEST WINDS 10 TO 15 MPH WITH GUSTS TO 30
MPH.
* MIXING HEIGHT......4800-5800 FT AGL IN THE EVENING THEN 200-500
FT AGL.
* TRANSPORT WINDS....NORTH 10 TO 15 MPH.
* VENTILATION........EXCELLENT DECREASING TO POOR AFTER MIDNIGHT.
THURSDAY
* SKY/WEATHER........PARTLY CLOUDY THEN BECOMING SUNNY.
* CHANCE OF THUNDER..0%.
* CHC WETTING RAIN...0%.
* MAX TEMPERATURE....
* VALLEYS..........73-83.
* MID SLOPE........67-77.
* MIN HUMIDITY.......
* VALLEYS..........11-21%.
* MID SLOPE........13-23%.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....NORTHEAST WINDS 7 TO 12 MPH.
* RIDGE TOP........NORTH WINDS 10 TO 15 MPH. GUSTS TO 30 MPH UNTIL
LATE AFTERNOON.
* MIXING HEIGHT......2000-3000 FT AGL INCREASING TO 8100-9100 FT
AGL IN THE AFTERNOON.
* TRANSPORT WINDS....NORTH 10 TO 15 MPH.
* VENTILATION........GOOD INCREASING TO EXCELLENT IN THE AFTERNOON.
EXTENDED
THURSDAY NIGHT
PARTLY CLOUDY. LOWS 39-49. NORTH WINDS 8 TO 13 MPH
UNTIL EARLY MORNING BECOMING DOWNSLOPE 2 TO 5 MPH.
FRIDAY
CLEAR. HIGHS 76-86. LOWS 39-49. WEST WINDS 10 TO 15 MPH.
SATURDAY THROUGH SUNDAY
CLEAR. HIGHS 79-89. LOWS 40-50. WEST
WINDS 10 TO 20 MPH.
MEMORIAL DAY
CLEAR, BREEZY. HIGHS 77-87. LOWS 34-44.
TUESDAY
PARTLY CLOUDY. BREEZY. SLIGHT CHANCE OF SHOWERS. HIGHS
61-71.
CAZ271-210030-
WESTERN LASSEN, EASTERN PLUMAS, AND EASTERN SIERRA COUNTIES-
507 AM PDT WED MAY 20 2026
TODAY
* SKY/WEATHER........PARTLY CLOUDY THEN BECOMING SUNNY.
* CHANCE OF THUNDER..0%.
* CHC WETTING RAIN...0%.
* MAX TEMPERATURE....
* VALLEYS..........69-79.
* MID SLOPE........66-76.
* 24 HR TREND......5 DEGREES WARMER.
* MIN HUMIDITY.......
* VALLEYS..........17-27%.
* MID SLOPE........16-26%.
* 24 HR TREND......4% WETTER.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....UPSLOPE 4 TO 8 MPH BECOMING WEST 5 TO 10 MPH
LATE IN THE AFTERNOON.
* RIDGE TOP........SOUTHWEST WINDS 10 TO 15 MPH.
* MIXING HEIGHT......2600-3600 FT AGL INCREASING TO 8200-9200 FT
AGL IN THE AFTERNOON.
* TRANSPORT WINDS....LIGHT WINDS.
* VENTILATION........FAIR INCREASING TO VERY GOOD IN THE AFTERNOON.
TONIGHT
* SKY/WEATHER........CLEAR.
* CHANCE OF THUNDER..0%.
* CHC WETTING RAIN...0%.
* MIN TEMPERATURE....
* VALLEYS..........35-45.
* MID SLOPE........40-50.
* 24 HR TREND......4 DEGREES WARMER.
* MAX HUMIDITY.......
* VALLEYS..........61-71%.
* MID SLOPE........45-55%.
* 24 HR TREND......9% WETTER.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....WEST WINDS 5 TO 10 MPH IN THE EVENING BECOMING
DOWNSLOPE 2 TO 5 MPH.
* RIDGE TOP........NORTHWEST WINDS 10 TO 15 MPH WITH GUSTS TO 25
MPH UNTIL EARLY MORNING BECOMING LIGHT.
* MIXING HEIGHT......4100-5100 FT AGL IN THE EVENING THEN 200-500
FT AGL.
* TRANSPORT WINDS....NORTHWEST 10 TO 15 MPH.
* VENTILATION........EXCELLENT DECREASING TO POOR AFTER MIDNIGHT.
THURSDAY
* SKY/WEATHER........SUNNY.
* CHANCE OF THUNDER..0%.
* CHC WETTING RAIN...5%.
* MAX TEMPERATURE....
* VALLEYS..........72-82.
* MID SLOPE........69-79.
* MIN HUMIDITY.......
* VALLEYS..........18-27%.
* MID SLOPE........18-28%.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....UPSLOPE 4 TO 8 MPH.
* RIDGE TOP........NORTH WINDS 10 TO 15 MPH.
* MIXING HEIGHT......2400-3400 FT AGL INCREASING TO 8700-9700 FT
AGL IN THE AFTERNOON.
* TRANSPORT WINDS....NORTH 10 TO 15 MPH.
* VENTILATION........FAIR INCREASING TO EXCELLENT IN THE AFTERNOON.
EXTENDED
THURSDAY NIGHT
PARTLY CLOUDY IN THE EVENING THEN CLEARING. LOWS
37-47. DOWNSLOPE 2 TO 5 MPH.
FRIDAY
CLEAR. HIGHS 73-83. LOWS 37-47. SLOPE WINDS.
SATURDAY THROUGH SUNDAY
CLEAR. HIGHS 73-83. LOWS 35-45. SOUTHWEST
WINDS 10 TO 15 MPH.
MEMORIAL DAY
CLEAR. HIGHS 71-81. LOWS 33-43.
TUESDAY
PARTLY CLOUDY. SLIGHT CHANCE OF SHOWERS. HIGHS 58-68.
CAZ274-210030-
SOUTHERN MONO COUNTY-
507 AM PDT WED MAY 20 2026
TODAY
* SKY/WEATHER........SUNNY THEN BECOMING PARTLY CLOUDY.
* CHANCE OF THUNDER..0%.
* CHC WETTING RAIN...0%.
* MAX TEMPERATURE....
* VALLEYS..........63-73.
* MID SLOPE........59-69.
* 24 HR TREND......6 DEGREES WARMER.
* MIN HUMIDITY.......
* VALLEYS..........10-20%.
* MID SLOPE........11-21%.
* 24 HR TREND......6% WETTER.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....UPSLOPE 4 TO 8 MPH.
* RIDGE TOP........NORTHWEST WINDS 10 TO 15 MPH.
* MIXING HEIGHT......2200-3200 FT AGL INCREASING TO 6900-7900 FT
AGL IN THE AFTERNOON.
* TRANSPORT WINDS....LIGHT WINDS.
* VENTILATION........FAIR INCREASING TO VERY GOOD IN THE AFTERNOON.
TONIGHT
* SKY/WEATHER........PARTLY CLOUDY THEN BECOMING CLEAR.
* CHANCE OF THUNDER..0%.
* CHC WETTING RAIN...0%.
* MIN TEMPERATURE....
* VALLEYS..........33-43.
* MID SLOPE........35-45.
* 24 HR TREND......6 DEGREES WARMER.
* MAX HUMIDITY.......
* VALLEYS..........47-57%.
* MID SLOPE........36-46%.
* 24 HR TREND......15% WETTER.
* 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....NORTHWEST 10 TO 15 MPH.
* VENTILATION........EXCELLENT DECREASING TO POOR AFTER MIDNIGHT.
THURSDAY
* SKY/WEATHER........SUNNY.
* CHANCE OF THUNDER..0%.
* CHC WETTING RAIN...5%.
* MAX TEMPERATURE....
* VALLEYS..........68-78.
* MID SLOPE........64-74.
* MIN HUMIDITY.......
* VALLEYS..........13-23%.
* MID SLOPE........14-24%.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....UPSLOPE 4 TO 8 MPH.
* RIDGE TOP........LIGHT WINDS BECOMING NORTHWEST 10 TO 15 MPH WITH
GUSTS TO 25 MPH IN THE AFTERNOON.
* MIXING HEIGHT......2600-3600 FT AGL INCREASING TO 8900-9900 FT
AGL IN THE AFTERNOON.
* TRANSPORT WINDS....NORTHWEST 10 TO 15 MPH.
* VENTILATION........GOOD INCREASING TO EXCELLENT IN THE AFTERNOON.
EXTENDED
THURSDAY NIGHT
MOSTLY CLOUDY IN THE EVENING THEN CLEARING. SLIGHT
CHANCE OF SHOWERS IN THE EVENING. LOWS 37-47. NORTHWEST WINDS 5 TO
10 MPH IN THE EVENING BECOMING DOWNSLOPE 2 TO 5 MPH.
FRIDAY
PARTLY CLOUDY. SLIGHT CHANCE OF THUNDERSTORMS. HIGHS
66-76. LOWS 36-46. SLOPE WINDS.
SATURDAY
CLEAR. HIGHS 69-79. LOWS 36-46. SLOPE WINDS.
SUNDAY
PARTLY CLOUDY. SLIGHT CHANCE OF SHOWERS. HIGHS 70-80. LOWS
38-48. SLOPE WINDS.
MEMORIAL DAY
CLEAR. HIGHS 70-80. LOWS 36-46.
TUESDAY
SUNNY. HIGHS 64-74.
.8 TO 14 DAY OUTLOOK FOR (WED MAY 27 THROUGH TUE JUN 2)
NEAR NORMAL TEMPERATURES AND PRECIPITATION.
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