766
FNUS55 KREV 202054
FWFREV
FIRE WEATHER PLANNING FORECAST
NATIONAL WEATHER SERVICE RENO NV
154 PM PDT WED MAY 20 2026
DISCUSSION
WARMER THAN NORMAL TEMPERATURES WILL COMBINE WITH RH REDUCTIONS INTO THE
LOW TEENS AND TWENTIES EACH AFTERNOON THROUGH THE WEEKEND. CHANCES OF
AFTERNOON SHOWERS AND THUNDERSTORMS INCREASE THURSDAY INTO THE WEEKEND.
AN OVERLAP OF STRONGER WINDS AND WARM, DRY CONDITIONS IS POSSIBLE MONDAY
BEFORE HUMIDITY AND SHOWER CHANCES INCREASE TUESDAY, BUT CONFIDENCE IS
LOW.
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
NVZ420-211430-
NORTHERN SIERRA FRONT INCLUDING CARSON CITY, DOUGLAS, STOREY,
SOUTHERN WASHOE, WESTERN LYON, AND FAR SOUTHERN LASSEN COUNTIES-
154 PM PDT WED MAY 20 2026
TONIGHT
* SKY/WEATHER........CLEAR.
* CHANCE OF THUNDER..0%.
* CHC WETTING RAIN...0%.
* MIN TEMPERATURE....
* VALLEYS..........41-51.
* MID SLOPE........43-53.
* 24 HR TREND......5 DEGREES WARMER.
* MAX HUMIDITY.......
* VALLEYS..........44-54%.
* MID SLOPE........35-45%.
* 24 HR TREND......12% WETTER.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....WEST WINDS 7 TO 12 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......5100-6100 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..........73-83.
* MID SLOPE........70-80.
* 24 HR TREND......LITTLE CHANGE.
* MIN HUMIDITY.......
* VALLEYS..........11-21%.
* MID SLOPE........15-23%.
* 24 HR TREND......4% WETTER.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....UPSLOPE 4 TO 8 MPH BECOMING NORTH 8 TO 13 MPH IN
THE AFTERNOON.
* RIDGE TOP........NORTHEAST WINDS 10 TO 15 MPH WITH GUSTS TO 25
MPH.
* MIXING HEIGHT......2400-3400 FT AGL INCREASING TO 7300-8300 FT
AGL IN THE AFTERNOON.
* TRANSPORT WINDS....NORTH 10 TO 15 MPH.
* VENTILATION........GOOD INCREASING TO EXCELLENT IN THE AFTERNOON.
THURSDAY NIGHT
* SKY/WEATHER........MOSTLY CLOUDY THEN BECOMING CLEAR.
* CHANCE OF THUNDER..0%.
* CHC WETTING RAIN...5%.
* MIN TEMPERATURE....
* VALLEYS..........44-54.
* MID SLOPE........47-57.
* MAX HUMIDITY.......
* VALLEYS..........43-53%.
* MID SLOPE........35-45%.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....NORTHWEST WINDS 9 TO 14 MPH IN THE EVENING
BECOMING DOWNSLOPE 2 TO 5 MPH.
* RIDGE TOP........WEST WINDS 10 TO 15 MPH. GUSTS TO 30 MPH IN THE
EVENING.
* MIXING HEIGHT......4600-5600 FT AGL IN THE EVENING THEN 200-500
FT AGL.
* TRANSPORT WINDS....NORTH 10 TO 15 MPH.
* VENTILATION........EXCELLENT DECREASING TO POOR AFTER MIDNIGHT.
FRIDAY
* SKY/WEATHER........SUNNY.
* CHANCE OF THUNDER..0%.
* CHC WETTING RAIN...5%.
* MAX TEMPERATURE....
* VALLEYS..........74-84.
* MID SLOPE........71-81.
* MIN HUMIDITY.......
* VALLEYS..........10-20%.
* MID SLOPE........15-25%.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....UPSLOPE 4 TO 8 MPH.
* RIDGE TOP........LIGHT WINDS BECOMING NORTHEAST 10 TO 15 MPH IN
THE AFTERNOON.
* MIXING HEIGHT......800-1300 FT AGL INCREASING TO 7500-8500 FT AGL
IN THE AFTERNOON.
* TRANSPORT WINDS....LIGHT WINDS.
* VENTILATION........POOR INCREASING TO VERY GOOD IN THE AFTERNOON.
EXTENDED
FRIDAY NIGHT
PARTLY CLOUDY IN THE EVENING THEN BECOMING CLEAR.
LOWS 44-54. WEST WINDS 9 TO 14 MPH.
SATURDAY THROUGH MEMORIAL DAY
CLEAR. HIGHS 77-87. LOWS 41-51.
WEST WINDS 10 TO 20 MPH.
TUESDAY
CLEAR, BREEZY. SLIGHT CHANCE OF SHOWERS. HIGHS 63-73.
LOWS 35-45.
WEDNESDAY
PARTLY CLOUDY. SLIGHT CHANCE OF SHOWERS. HIGHS 59-69.
NVZ421-211430-
SOUTHERN SIERRA FRONT INCLUDING ALPINE, NORTHERN MONO, SOUTHERN
LYON, AND WESTERN MINERAL COUNTIES-
154 PM PDT WED MAY 20 2026
TONIGHT
* SKY/WEATHER........CLEAR.
* CHANCE OF THUNDER..0%.
* CHC WETTING RAIN...0%.
* MIN TEMPERATURE....
* VALLEYS..........33-43.
* MID SLOPE........42-52.
* 24 HR TREND......6 DEGREES WARMER.
* MAX HUMIDITY.......
* VALLEYS..........43-53%.
* MID SLOPE........26-36%.
* 24 HR TREND......14% WETTER.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....NORTHWEST WINDS 7 TO 12 MPH IN THE EVENING
BECOMING DOWNSLOPE 2 TO 5 MPH.
* RIDGE TOP........LIGHT WINDS.
* MIXING HEIGHT......4800-5800 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..........71-81.
* MID SLOPE........64-74.
* 24 HR TREND......4 DEGREES WARMER.
* MIN HUMIDITY.......
* VALLEYS..........12-22%.
* MID SLOPE........12-22%.
* 24 HR TREND......4% WETTER.
* 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......2500-3500 FT AGL INCREASING TO 7400-8400 FT
AGL IN THE AFTERNOON.
* TRANSPORT WINDS....NORTHWEST 10 TO 15 MPH.
* VENTILATION........GOOD INCREASING TO EXCELLENT IN THE AFTERNOON.
THURSDAY NIGHT
* SKY/WEATHER........PARTLY CLOUDY THEN BECOMING CLEAR.
* CHANCE OF THUNDER..0%.
* CHC WETTING RAIN...5%.
* MIN TEMPERATURE....
* VALLEYS..........37-47.
* MID SLOPE........47-57.
* MAX HUMIDITY.......
* VALLEYS..........50-60%.
* MID SLOPE........36-46%.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....NORTHWEST WINDS 9 TO 15 MPH IN THE EVENING
BECOMING DOWNSLOPE 2 TO 5 MPH.
* RIDGE TOP........LIGHT WINDS. GUSTS TO 25 MPH IN THE EVENING.
* MIXING HEIGHT......4300-5300 FT AGL IN THE EVENING THEN 200-500
FT AGL.
* TRANSPORT WINDS....NORTHWEST 10 TO 15 MPH.
* VENTILATION........EXCELLENT DECREASING TO POOR AFTER MIDNIGHT.
FRIDAY
* SKY/WEATHER........SUNNY THEN BECOMING PARTLY CLOUDY. SLIGHT
CHANCE OF SHOWERS IN THE AFTERNOON.
* CHANCE OF THUNDER..0%.
* CHC WETTING RAIN...5%.
* MAX TEMPERATURE....
* VALLEYS..........71-81.
* MID SLOPE........64-74.
* MIN HUMIDITY.......
* VALLEYS..........14-24%.
* MID SLOPE........15-25%.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....UPSLOPE 4 TO 8 MPH.
* RIDGE TOP........LIGHT WINDS BECOMING WEST 10 TO 15 MPH WITH
GUSTS TO 20 MPH IN THE AFTERNOON.
* MIXING HEIGHT......1000-1500 FT AGL INCREASING TO 8200-9200 FT
AGL IN THE AFTERNOON.
* TRANSPORT WINDS....LIGHT WINDS.
* VENTILATION........MARGINAL INCREASING TO EXCELLENT IN THE
AFTERNOON.
EXTENDED
FRIDAY NIGHT
PARTLY CLOUDY IN THE EVENING THEN CLEARING. LOWS
36-46. WEST WINDS 8 TO 13 MPH UNTIL EARLY MORNING BECOMING DOWNSLOPE
2 TO 5 MPH.
SATURDAY THROUGH MEMORIAL DAY
CLEAR. HIGHS 74-84. LOWS 36-46.
SOUTHWEST WINDS 10 TO 15 MPH.
TUESDAY
CLEAR, BREEZY. HIGHS 63-73. LOWS 29-39.
WEDNESDAY
MOSTLY SUNNY. SLIGHT CHANCE OF SHOWERS. HIGHS 57-67.
CAZ272-211430-
GREATER LAKE TAHOE AND TRUCKEE AREA-
154 PM PDT WED MAY 20 2026
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..........68-78%.
* MID SLOPE........43-53%.
* 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......3900-4900 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.
* 24 HR TREND......4 DEGREES WARMER.
* MIN HUMIDITY.......
* VALLEYS..........21-31%.
* MID SLOPE........21-31%.
* 24 HR TREND......5% WETTER.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....UPSLOPE 4 TO 8 MPH.
* RIDGE TOP........LIGHT WINDS BECOMING NORTHWEST 10 TO 15 MPH LATE
IN THE AFTERNOON.
* MIXING HEIGHT......2100-3100 FT AGL INCREASING TO 6400-7400 FT
AGL IN THE AFTERNOON.
* TRANSPORT WINDS....LIGHT WINDS.
* VENTILATION........FAIR INCREASING TO VERY GOOD IN THE AFTERNOON.
THURSDAY NIGHT
* SKY/WEATHER........PARTLY CLOUDY THEN BECOMING CLEAR.
* CHANCE OF THUNDER..0%.
* CHC WETTING RAIN...5%.
* MIN TEMPERATURE....
* VALLEYS..........37-47.
* MID SLOPE........40-50.
* MAX HUMIDITY.......
* VALLEYS..........69-79%.
* MID SLOPE........45-55%.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....DOWNSLOPE 2 TO 5 MPH.
* RIDGE TOP........LIGHT WINDS.
* MIXING HEIGHT......3100-4100 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.
FRIDAY
* SKY/WEATHER........SUNNY THEN BECOMING PARTLY CLOUDY. SLIGHT
CHANCE OF SHOWERS IN THE AFTERNOON.
* CHANCE OF THUNDER..0%.
* CHC WETTING RAIN...5%.
* MAX TEMPERATURE....
* VALLEYS..........65-75.
* MID SLOPE........62-72.
* MIN HUMIDITY.......
* VALLEYS..........24-34%.
* MID SLOPE........22-32%.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....UPSLOPE 4 TO 8 MPH.
* RIDGE TOP........LIGHT WINDS.
* MIXING HEIGHT......1000-1500 FT AGL INCREASING TO 5400-6400 FT
AGL IN THE AFTERNOON.
* TRANSPORT WINDS....LIGHT WINDS.
* VENTILATION........MARGINAL INCREASING TO GOOD IN THE AFTERNOON.
EXTENDED
FRIDAY NIGHT
PARTLY CLOUDY IN THE EVENING THEN BECOMING CLEAR.
LOWS 36-46. DOWNSLOPE 2 TO 5 MPH.
SATURDAY THROUGH MEMORIAL DAY
CLEAR. HIGHS 66-76. LOWS 35-45.
SOUTHWEST WINDS 8 TO 13 MPH.
TUESDAY THROUGH WEDNESDAY
PARTLY CLOUDY. CHANCE OF SHOWERS. HIGHS
53-61. LOWS 31-41.
NVZ423-211430-
WEST HUMBOLDT BASIN IN PERSHING COUNTY-
154 PM PDT WED MAY 20 2026
TONIGHT
* SKY/WEATHER........CLEAR THEN BECOMING PARTLY CLOUDY.
* CHANCE OF THUNDER..0%.
* CHC WETTING RAIN...0%.
* MIN TEMPERATURE....
* VALLEYS..........43-53.
* MID SLOPE........46-55.
* 24 HR TREND......7 DEGREES WARMER.
* MAX HUMIDITY.......
* VALLEYS..........33-43%.
* MID SLOPE........24-34%.
* 24 HR TREND......6% WETTER.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....DOWNSLOPE 2 TO 5 MPH.
* RIDGE TOP........NORTHWEST WINDS 10 TO 15 MPH. GUSTS TO 25 MPH
LATE IN THE NIGHT.
* MIXING HEIGHT......5200-6200 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........71-81.
* 24 HR TREND......LITTLE CHANGE.
* MIN HUMIDITY.......
* VALLEYS..........12-17%.
* MID SLOPE........13-18%.
* 24 HR TREND......LITTLE CHANGE.
* 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......2200-3200 FT AGL INCREASING TO 7700-8700 FT
AGL IN THE AFTERNOON.
* TRANSPORT WINDS....NORTH 10 TO 15 MPH.
* VENTILATION........GOOD INCREASING TO EXCELLENT IN THE AFTERNOON.
THURSDAY NIGHT
* SKY/WEATHER........PARTLY CLOUDY THEN BECOMING CLEAR.
* CHANCE OF THUNDER..0%.
* CHC WETTING RAIN...0%.
* MIN TEMPERATURE....
* VALLEYS..........43-53.
* MID SLOPE........46-56.
* MAX HUMIDITY.......
* VALLEYS..........25-35%.
* MID SLOPE........20-30%.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....NORTH WINDS 9 TO 14 MPH.
* RIDGE TOP........NORTHEAST WINDS 10 TO 15 MPH.
* MIXING HEIGHT......4600-5600 FT AGL DECREASING TO 600-1000 FT AGL
AFTER MIDNIGHT.
* TRANSPORT WINDS....NORTHEAST 10 TO 15 MPH.
* VENTILATION........EXCELLENT DECREASING TO MARGINAL AFTER
MIDNIGHT.
FRIDAY
* SKY/WEATHER........SUNNY.
* CHANCE OF THUNDER..0%.
* CHC WETTING RAIN...0%.
* MAX TEMPERATURE....
* VALLEYS..........79-87.
* MID SLOPE........74-84.
* MIN HUMIDITY.......
* VALLEYS..........9-14%.
* MID SLOPE........10-15%.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....UPSLOPE 4 TO 8 MPH.
* RIDGE TOP........LIGHT WINDS.
* MIXING HEIGHT......600-1100 FT AGL INCREASING TO 8500-9500 FT AGL
IN THE AFTERNOON.
* TRANSPORT WINDS....LIGHT WINDS.
* VENTILATION........MARGINAL INCREASING TO EXCELLENT IN THE
AFTERNOON.
EXTENDED
FRIDAY NIGHT
CLEAR. LOWS 47-57. NORTHWEST WINDS 7 TO 12 MPH IN
THE EVENING BECOMING DOWNSLOPE 2 TO 5 MPH.
SATURDAY THROUGH MEMORIAL DAY
CLEAR. HIGHS 83-92. LOWS 43-53.
WEST WINDS 10 TO 20 MPH.
TUESDAY
PARTLY CLOUDY. BREEZY. SLIGHT CHANCE OF SHOWERS. HIGHS
68-76. LOWS 36-46.
WEDNESDAY
PARTLY CLOUDY. SLIGHT CHANCE OF SHOWERS. HIGHS 62-70.
NVZ429-211430-
LAHONTAN BASIN INCLUDING CHURCHILL AND EASTERN MINERAL COUNTIES-
154 PM PDT WED MAY 20 2026
TONIGHT
* SKY/WEATHER........CLEAR.
* CHANCE OF THUNDER..0%.
* CHC WETTING RAIN...0%.
* MIN TEMPERATURE....
* VALLEYS..........40-50.
* MID SLOPE........45-55.
* 24 HR TREND......7 DEGREES WARMER.
* MAX HUMIDITY.......
* VALLEYS..........32-42%.
* MID SLOPE........23-33%.
* 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.
* MIXING HEIGHT......4800-5800 FT AGL IN THE EVENING THEN 200-500
FT AGL.
* TRANSPORT WINDS....LIGHT WINDS.
* VENTILATION........VERY GOOD DECREASING TO POOR AFTER MIDNIGHT.
THURSDAY
* SKY/WEATHER........SUNNY.
* CHANCE OF THUNDER..0%.
* CHC WETTING RAIN...0%.
* MAX TEMPERATURE....
* VALLEYS..........75-85.
* MID SLOPE........70-80.
* 24 HR TREND......4 DEGREES WARMER.
* MIN HUMIDITY.......
* VALLEYS..........11-17%.
* MID SLOPE........12-18%.
* 24 HR TREND......4% WETTER.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....UPSLOPE 4 TO 8 MPH BECOMING NORTH 9 TO 14 MPH IN
THE LATE MORNING AND AFTERNOON.
* RIDGE TOP........NORTH WINDS 10 TO 20 MPH.
* MIXING HEIGHT......2600-3600 FT AGL INCREASING TO 9000-10000 FT
AGL IN THE AFTERNOON.
* TRANSPORT WINDS....NORTH 10 TO 15 MPH.
* VENTILATION........GOOD INCREASING TO EXCELLENT IN THE AFTERNOON.
THURSDAY NIGHT
* SKY/WEATHER........PARTLY CLOUDY.
* CHANCE OF THUNDER..0%.
* CHC WETTING RAIN...0%.
* MIN TEMPERATURE....
* VALLEYS..........45-55.
* MID SLOPE........48-58.
* MAX HUMIDITY.......
* VALLEYS..........36-46%.
* MID SLOPE........24-34%.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....NORTH WINDS 9 TO 15 MPH.
* RIDGE TOP........NORTH WINDS 10 TO 15 MPH. GUSTS TO 30 MPH UNTIL
EARLY MORNING.
* MIXING HEIGHT......5000-6000 FT AGL DECREASING TO 700-1200 FT AGL
AFTER MIDNIGHT.
* TRANSPORT WINDS....NORTH 10 TO 15 MPH.
* VENTILATION........EXCELLENT DECREASING TO MARGINAL AFTER
MIDNIGHT.
FRIDAY
* SKY/WEATHER........PARTLY CLOUDY THEN BECOMING SUNNY.
* CHANCE OF THUNDER..0%.
* CHC WETTING RAIN...0%.
* MAX TEMPERATURE....
* VALLEYS..........76-86.
* MID SLOPE........71-81.
* MIN HUMIDITY.......
* VALLEYS..........10-20%.
* MID SLOPE........10-20%.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....UPSLOPE 4 TO 8 MPH.
* RIDGE TOP........SOUTHEAST WINDS 10 TO 15 MPH SHIFTING TO THE
NORTHWEST IN THE AFTERNOON.
* MIXING HEIGHT......800-1300 FT AGL INCREASING TO 8600-9600 FT AGL
IN THE AFTERNOON.
* TRANSPORT WINDS....LIGHT WINDS.
* VENTILATION........MARGINAL INCREASING TO EXCELLENT IN THE
AFTERNOON.
EXTENDED
FRIDAY NIGHT
PARTLY CLOUDY IN THE EVENING THEN BECOMING CLEAR.
LOWS 46-56. WEST WINDS 8 TO 13 MPH.
SATURDAY THROUGH MEMORIAL DAY
CLEAR. HIGHS 80-90. LOWS 44-54.
WEST WINDS 10 TO 20 MPH.
TUESDAY
PARTLY CLOUDY. BREEZY. SLIGHT CHANCE OF SHOWERS. HIGHS
70-80. LOWS 36-46.
WEDNESDAY
MOSTLY SUNNY. SLIGHT CHANCE OF SHOWERS. HIGHS 61-71.
CAZ270-278-NVZ458-211430-
SURPRISE VALLEY CALIFORNIA-EASTERN LASSEN COUNTY-
NORTHERN WASHOE COUNTY-
154 PM PDT WED MAY 20 2026
TONIGHT
* SKY/WEATHER........PARTLY CLOUDY.
* CHANCE OF THUNDER..0%.
* CHC WETTING RAIN...0%.
* MIN TEMPERATURE....
* VALLEYS..........38-48.
* MID SLOPE........42-52.
* 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 8 TO 13 MPH. GUSTS TO 20 MPH
UNTIL EARLY MORNING.
* RIDGE TOP........NORTHWEST WINDS 10 TO 15 MPH WITH GUSTS TO 25
MPH.
* MIXING HEIGHT......5000-6000 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...0%.
* MAX TEMPERATURE....
* VALLEYS..........73-83.
* MID SLOPE........68-78.
* 24 HR TREND......LITTLE CHANGE.
* MIN HUMIDITY.......
* VALLEYS..........13-23%.
* MID SLOPE........15-23%.
* 24 HR TREND......LITTLE CHANGE.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....UPSLOPE 4 TO 8 MPH BECOMING NORTHEAST 7 TO 12
MPH IN THE AFTERNOON.
* RIDGE TOP........NORTHEAST WINDS 10 TO 15 MPH. GUSTS TO 25 MPH
UNTIL LATE AFTERNOON.
* MIXING HEIGHT......1900-2900 FT AGL INCREASING TO 7400-8400 FT
AGL IN THE AFTERNOON.
* TRANSPORT WINDS....NORTH 10 TO 15 MPH.
* VENTILATION........GOOD INCREASING TO VERY GOOD IN THE AFTERNOON.
THURSDAY NIGHT
* SKY/WEATHER........PARTLY CLOUDY THEN BECOMING CLEAR.
* CHANCE OF THUNDER..0%.
* CHC WETTING RAIN...0%.
* MIN TEMPERATURE....
* VALLEYS..........40-50.
* MID SLOPE........44-54.
* MAX HUMIDITY.......
* VALLEYS..........39-49%.
* MID SLOPE........26-36%.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....NORTH WINDS 8 TO 13 MPH UNTIL EARLY MORNING
BECOMING DOWNSLOPE 2 TO 5 MPH.
* RIDGE TOP........NORTH WINDS 10 TO 15 MPH.
* MIXING HEIGHT......4300-5300 FT AGL IN THE EVENING THEN 200-500
FT AGL.
* TRANSPORT WINDS....NORTHEAST 10 TO 15 MPH.
* VENTILATION........VERY GOOD DECREASING TO POOR AFTER MIDNIGHT.
FRIDAY
* SKY/WEATHER........SUNNY.
* CHANCE OF THUNDER..0%.
* CHC WETTING RAIN...0%.
* MAX TEMPERATURE....
* VALLEYS..........75-85.
* MID SLOPE........72-80.
* MIN HUMIDITY.......
* VALLEYS..........11-21%.
* MID SLOPE........12-21%.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....UPSLOPE 4 TO 8 MPH.
* RIDGE TOP........NORTHEAST WINDS 10 TO 15 MPH SHIFTING TO THE
SOUTHWEST IN THE AFTERNOON.
* MIXING HEIGHT......700-1200 FT AGL INCREASING TO 8400-9400 FT AGL
IN THE AFTERNOON.
* TRANSPORT WINDS....LIGHT WINDS.
* VENTILATION........MARGINAL INCREASING TO VERY GOOD IN THE
AFTERNOON.
EXTENDED
FRIDAY NIGHT
PARTLY CLOUDY IN THE EVENING THEN BECOMING CLEAR.
LOWS 42-52. WEST WINDS 8 TO 13 MPH UNTIL EARLY MORNING BECOMING
DOWNSLOPE 2 TO 5 MPH.
SATURDAY THROUGH SUNDAY
CLEAR. HIGHS 79-89. LOWS 39-49. WEST
WINDS 10 TO 20 MPH.
MEMORIAL DAY
PARTLY CLOUDY. HIGHS 76-86. LOWS 36-46. WEST WINDS
10 TO 20 MPH.
TUESDAY THROUGH WEDNESDAY
PARTLY CLOUDY. BREEZY. SLIGHT CHANCE OF
SHOWERS. HIGHS 60-70. LOWS 32-42.
CAZ271-211430-
WESTERN LASSEN, EASTERN PLUMAS, AND EASTERN SIERRA COUNTIES-
154 PM PDT WED MAY 20 2026
TONIGHT
* SKY/WEATHER........PARTLY CLOUDY THEN BECOMING 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........WEST WINDS 10 TO 15 MPH WITH GUSTS TO 25 MPH
UNTIL EARLY MORNING BECOMING LIGHT.
* MIXING HEIGHT......4300-5300 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...0%.
* MAX TEMPERATURE....
* VALLEYS..........72-82.
* MID SLOPE........69-79.
* 24 HR TREND......LITTLE CHANGE.
* MIN HUMIDITY.......
* VALLEYS..........19-27%.
* MID SLOPE........18-28%.
* 24 HR TREND......LITTLE CHANGE.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....UPSLOPE 4 TO 8 MPH.
* RIDGE TOP........LIGHT WINDS.
* MIXING HEIGHT......2100-3100 FT AGL INCREASING TO 8100-9100 FT
AGL IN THE AFTERNOON.
* TRANSPORT WINDS....LIGHT WINDS.
* VENTILATION........FAIR INCREASING TO VERY GOOD IN THE AFTERNOON.
THURSDAY NIGHT
* SKY/WEATHER........PARTLY CLOUDY THEN BECOMING CLEAR.
* CHANCE OF THUNDER..0%.
* CHC WETTING RAIN...5%.
* MIN TEMPERATURE....
* VALLEYS..........38-48.
* MID SLOPE........43-53.
* MAX HUMIDITY.......
* VALLEYS..........57-67%.
* MID SLOPE........45-55%.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....NORTHWEST WINDS 5 TO 10 MPH IN THE EVENING
BECOMING DOWNSLOPE 2 TO 5 MPH.
* RIDGE TOP........WEST WINDS 10 TO 15 MPH. GUSTS TO 25 MPH IN THE
EVENING.
* MIXING HEIGHT......4200-5200 FT AGL IN THE EVENING THEN 200-500
FT AGL.
* TRANSPORT WINDS....NORTH 10 TO 15 MPH.
* VENTILATION........EXCELLENT DECREASING TO POOR AFTER MIDNIGHT.
FRIDAY
* SKY/WEATHER........SUNNY.
* CHANCE OF THUNDER..0%.
* CHC WETTING RAIN...5%.
* MAX TEMPERATURE....
* VALLEYS..........73-83.
* MID SLOPE........69-79.
* MIN HUMIDITY.......
* VALLEYS..........18-28%.
* MID SLOPE........19-29%.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....UPSLOPE 4 TO 8 MPH.
* RIDGE TOP........SOUTHEAST WINDS 10 TO 15 MPH UNTIL LATE
AFTERNOON BECOMING LIGHT.
* MIXING HEIGHT......900-1400 FT AGL INCREASING TO 8200-9200 FT AGL
IN THE AFTERNOON.
* TRANSPORT WINDS....LIGHT WINDS.
* VENTILATION........MARGINAL INCREASING TO VERY GOOD IN THE
AFTERNOON.
EXTENDED
FRIDAY NIGHT
PARTLY CLOUDY IN THE EVENING THEN BECOMING CLEAR.
LOWS 37-47. WEST WINDS 7 TO 12 MPH IN THE EVENING BECOMING DOWNSLOPE
2 TO 5 MPH.
SATURDAY THROUGH MEMORIAL DAY
CLEAR. HIGHS 72-82. LOWS 34-44.
SOUTHWEST WINDS 10 TO 20 MPH.
TUESDAY THROUGH WEDNESDAY
PARTLY CLOUDY. SLIGHT CHANCE OF
SHOWERS. HIGHS 56-66. LOWS 31-41.
CAZ274-211430-
SOUTHERN MONO COUNTY-
154 PM PDT WED MAY 20 2026
TONIGHT
* SKY/WEATHER........CLEAR.
* CHANCE OF THUNDER..0%.
* CHC WETTING RAIN...0%.
* MIN TEMPERATURE....
* VALLEYS..........33-43.
* MID SLOPE........34-44.
* 24 HR TREND......6 DEGREES WARMER.
* MAX HUMIDITY.......
* VALLEYS..........44-54%.
* MID SLOPE........35-45%.
* 24 HR TREND......15% WETTER.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....DOWNSLOPE 2 TO 5 MPH.
* RIDGE TOP........LIGHT WINDS.
* MIXING HEIGHT......4800-5800 FT AGL DECREASING TO 600 FT AGL
AFTER MIDNIGHT.
* TRANSPORT WINDS....LIGHT WINDS.
* VENTILATION........VERY GOOD DECREASING TO POOR AFTER MIDNIGHT.
THURSDAY
* SKY/WEATHER........SUNNY.
* CHANCE OF THUNDER..0%.
* CHC WETTING RAIN...5%.
* MAX TEMPERATURE....
* VALLEYS..........67-77.
* MID SLOPE........64-74.
* 24 HR TREND......5 DEGREES WARMER.
* MIN HUMIDITY.......
* VALLEYS..........12-22%.
* MID SLOPE........13-23%.
* 24 HR TREND......4% WETTER.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....UPSLOPE 4 TO 8 MPH BECOMING NORTHWEST 5 TO 10
MPH WITH GUSTS TO 20 MPH LATE IN THE
AFTERNOON.
* RIDGE TOP........NORTHWEST WINDS 10 TO 15 MPH. GUSTS TO 25 MPH IN
THE AFTERNOON.
* MIXING HEIGHT......2600-3600 FT AGL INCREASING TO 7300-8300 FT
AGL IN THE AFTERNOON.
* TRANSPORT WINDS....NORTHWEST 10 TO 15 MPH.
* VENTILATION........GOOD INCREASING TO EXCELLENT IN THE AFTERNOON.
THURSDAY NIGHT
* SKY/WEATHER........MOSTLY CLOUDY THEN BECOMING CLEAR.
* CHANCE OF THUNDER..0%.
* CHC WETTING RAIN...5%.
* MIN TEMPERATURE....
* VALLEYS..........37-47.
* MID SLOPE........38-48.
* MAX HUMIDITY.......
* VALLEYS..........57-67%.
* MID SLOPE........45-55%.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....WEST WINDS 9 TO 14 MPH IN THE EVENING BECOMING
DOWNSLOPE 2 TO 5 MPH.
* RIDGE TOP........WEST WINDS 10 TO 15 MPH WITH GUSTS TO 25 MPH.
* MIXING HEIGHT......4800-5800 FT AGL IN THE EVENING THEN 200-500
FT AGL.
* TRANSPORT WINDS....NORTHWEST 10 TO 15 MPH.
* VENTILATION........EXCELLENT DECREASING TO POOR AFTER MIDNIGHT.
FRIDAY
* SKY/WEATHER........SUNNY THEN BECOMING PARTLY CLOUDY. SLIGHT
CHANCE OF SHOWERS IN THE AFTERNOON.
* CHANCE OF THUNDER..0%.
* CHC WETTING RAIN...5%.
* MAX TEMPERATURE....
* VALLEYS..........66-76.
* MID SLOPE........63-73.
* MIN HUMIDITY.......
* VALLEYS..........18-28%.
* MID SLOPE........21-31%.
* 20-FOOT WINDS......
* VALLEYS/SLOPE....UPSLOPE 4 TO 8 MPH.
* RIDGE TOP........LIGHT WINDS BECOMING SOUTHWEST 10 TO 15 MPH LATE
IN THE AFTERNOON.
* MIXING HEIGHT......1100-1600 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 VERY GOOD IN THE
AFTERNOON.
EXTENDED
FRIDAY NIGHT
MOSTLY CLOUDY IN THE EVENING THEN CLEARING. LOWS
36-46. DOWNSLOPE 2 TO 5 MPH.
SATURDAY THROUGH MEMORIAL DAY
CLEAR. HIGHS 69-79. LOWS 36-46.
SOUTHWEST WINDS 8 TO 13 MPH.
TUESDAY
CLEAR. HIGHS 61-71. LOWS 30-40.
WEDNESDAY
MOSTLY SUNNY. SLIGHT CHANCE OF SNOW SHOWERS. HIGHS 56-66.
.8 TO 14 DAY OUTLOOK FOR (THU MAY 28 THROUGH WED JUN 3)
NEAR NORMAL TEMPERATURES AND ABOVE NORMAL PRECIPITATION.
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