939
FNUS76 KSTO 280035
FWSSTO
SPOT FORECAST FOR PLUMAS TREX BUTTERFLY VALLEY...USFS
NATIONAL WEATHER SERVICE SACRAMENTO CA
535 PM PDT MON APR 27 2026
FORECAST IS BASED ON IGNITION TIME OF 1800 PDT ON APRIL 27.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.
DISCUSSION
ISOLATED SHOWERS WITH A SLIGHT CHANCE OF A THUNDERSTORM THROUGH AROUND 9
PM TONIGHT. FOR TUESDAY, AFTERNOON SHOWERS AND THUNDERSTORMS ARE IN THE
FORECAST, AROUND A 10-15% CHANCE FOR ACTIVITY AT THE BURN SITE FROM 11 AM
THROUGH 9 PM. OTHERWISE, MOSTLY CLOUDY SKIES WITH SEASONABLE TEMPERATURES
WILL CONTINUE AT THE BURN SITE THE NEXT FEW DAYS WITH LIGHT TERRAIN
DRIVEN WINDS. WARMING TEMPERATURES AND DRYING CONDITIONS WILL PREVAIL
BY WEDNESDAY, WITH HUMIDITY VALUES DROPPING INTO THE MID TO UPPER 20S.
TONIGHT
SKY/WEATHER.........PARTLY CLOUDY THEN BECOMING MOSTLY CLOUDY THEN
BECOMING PARTLY CLOUDY. SLIGHT CHANCE OF RAIN
EARLY IN THE EVENING.
MIN TEMPERATURE.....32-36.
MAX HUMIDITY........98-100 PERCENT.
WIND (20 FT)........
SLOPE/VALLEY.......LIGHT WINDS.
RIDGETOP...........WEST 3 TO 10 MPH SHIFTING TO THE NORTHEAST 3 TO
5 MPH OVERNIGHT.
MIXING HEIGHT.......1500 FT AGL.
TRANSPORT WINDS.....WEST AROUND 10 MPH DECREASING TO 3 TO 10 MPH IN
THE EVENING AND OVERNIGHT, THEN SHIFTING TO THE
NORTHEAST 3 TO 5 MPH OVERNIGHT.
CWR.................11 PERCENT DECREASING TO 1 PERCENT LATE IN THE
EVENING.
CHANCE OF THUNDER...8 PERCENT.
TIME (PDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
SKY COVER.......PC MC PC PC PC PC MCR MCR MCR MCR PC PC
CWR.............10 10 10 10 10 0 0 0 0 0 0 0
CHC OF THDR (%).10 10 0 0 0 0 0 0 0 0 0 0
TEMP............57 55 49 46 43 42 41 39 38 37 36 36
RH..............55 61 72 84 90 95 98 100 100 100 100 100
SL/VL WIND DIR..W W SW S S N N N N N N N
SL/VL WIND SPD..3 2 2 1 1 0 0 0 0 0 0 0
SL/VL WIND GUST.7 5 5 2 2 1 1 1 1 1 1 1
RIDGE WIND DIR..W W W W W W W W NE NE NE NE
RIDGE WIND SPD..10 10 6 6 6 3 3 3 3 3 3 5
MIX HGT (KFT)...4.3 4.3 2.2 2.2 2.2 1.6 1.6 1.6 1.5 1.5 1.5 1.5
TRANSP WIND DIR.W W W W W W W W NE NE NE NE
TRANSP WIND SPD.10 10 6 6 6 3 3 3 3 3 3 5
TUESDAY
SKY/WEATHER.........MOSTLY SUNNY. CHANCE OF RAIN SHOWERS AND SLIGHT
CHANCE OF THUNDERSTORMS IN THE AFTERNOON.
MAX TEMPERATURE.....67-71.
MIN HUMIDITY........30-34 PERCENT.
WIND (20 FT)........
SLOPE/VALLEY.......LIGHT WINDS. GUSTY AND ERRATIC WINDS EXPECTED
NEAR THUNDERSTORMS LATE IN THE AFTERNOON.
RIDGETOP...........EAST 5 TO 6 MPH SHIFTING TO THE SOUTHWEST 5 TO
7 MPH LATE IN THE AFTERNOON.
MIXING HEIGHT.......7400 FT AGL.
TRANSPORT WINDS.....NORTHEAST AROUND 5 MPH SHIFTING TO THE
SOUTHWEST 5 TO 7 MPH LATE IN THE AFTERNOON.
CWR.................7 PERCENT.
CHANCE OF THUNDER...17 PERCENT.
TIME (PDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY COVER.......PC PC MCR MCR MCR CLR MCR PC PC MC PC PC
CWR.............0 0 0 0 0 10 10 10 10 10 10 0
CHC OF THDR (%).0 0 0 0 0 10 10 10 20 20 20 10
TEMP............36 35 38 41 49 54 59 65 67 68 69 67
RH..............98 98 99 86 70 55 46 36 31 32 33 37
SL/VL WIND DIR..N N N N N N N NW SW SW SW SW
SL/VL WIND SPD..0 0 0 0 0 0 0 1 1 2 3 3
SL/VL WIND GUST.1 1 1 2 2 2 3 5 5 6 7
RIDGE WIND DIR..NE NE E E E SE SE SE SW SW SW W
RIDGE WIND SPD..5 5 6 6 6 5 5 5 5 5 5 7
MIX HGT (KFT)...1.5 1.5 3.0 3.0 3.0 6.7 6.7 6.7 7.4 7.4 7.4 5.2
TRANSP WIND DIR.NE NE E E E SE SE SE SW SW SW W
TRANSP WIND SPD.5 5 6 6 6 5 5 5 5 5 5 7
TUESDAY NIGHT
SKY/WEATHER.........PARTLY CLOUDY THEN BECOMING MOSTLY CLEAR.
MIN TEMPERATURE.....35-39.
MAX HUMIDITY........98-100 PERCENT.
WIND (20 FT)........
SLOPE/VALLEY.......LIGHT WINDS.
RIDGETOP...........WEST 3 TO 7 MPH SHIFTING TO THE NORTHEAST
AROUND 5 MPH OVERNIGHT.
MIXING HEIGHT.......1500 FT AGL.
TRANSPORT WINDS.....WEST AROUND 7 MPH SHIFTING TO THE NORTHWEST 3
TO 7 MPH IN THE EVENING AND OVERNIGHT, THEN
SHIFTING TO THE NORTHEAST AROUND 5 MPH
OVERNIGHT.
CWR.................2 PERCENT.
CHANCE OF THUNDER...6 PERCENT.
TIME (PDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
SKY COVER.......PC PC PC PC PC MCR MCR MCR CLR CLR CLR MCR
CWR.............0 0 0 0 0 0 0 0 0 0 0 0
CHC OF THDR (%).10 10 0 0 0 0 0 0 0 0 0 0
TEMP............65 61 56 52 49 46 44 42 40 39 38 37
RH..............44 54 65 74 82 88 94 98 100 100 100 100
SL/VL WIND DIR..SW SW W W W N N N N N N N
SL/VL WIND SPD..3 3 1 1 1 0 0 0 0 0 0 0
SL/VL WIND GUST.7 7 3 3 3 1 1 1 1 1 1 1
RIDGE WIND DIR..W W NW NW NW NW NW NW NE NE NE E
RIDGE WIND SPD..7 7 7 7 7 3 3 3 5 5 5 5
MIX HGT (KFT)...5.2 5.2 1.6 1.6 1.6 1.6 1.6 1.6 1.5 1.5 1.5 1.5
TRANSP WIND DIR.W W NW NW NW NW NW NW NE NE NE E
TRANSP WIND SPD.7 7 7 7 7 3 3 3 5 5 5 5
WEDNESDAY
SKY/WEATHER.........SUNNY.
MAX TEMPERATURE.....74-78.
MIN HUMIDITY........23-27 PERCENT.
WIND (20 FT)........
SLOPE/VALLEY.......LIGHT WINDS.
RIDGETOP...........NORTHEAST AROUND 5 MPH SHIFTING TO THE WEST 3
TO 9 MPH LATE IN THE MORNING.
MIXING HEIGHT.......9000 FT AGL.
TRANSPORT WINDS.....EAST AROUND 5 MPH SHIFTING TO THE NORTHEAST IN
THE MORNING, THEN SHIFTING TO THE WEST 3 TO 9
MPH LATE IN THE MORNING.
CWR.................0 PERCENT.
CHANCE OF THUNDER...1 PERCENT.
TIME (PDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY COVER.......MCR MCR MCR MCR MCR CLR CLR CLR MCR MCR MCR MCR
CWR.............0 0 0 0 0 0 0 0 0 0 0 0
CHC OF THDR (%).0 0 0 0 0 0 0 0 0 0 0 0
TEMP............37 38 40 46 54 61 66 71 74 76 76 74
RH..............100 99 93 79 61 45 35 28 24 21 22 25
SL/VL WIND DIR..N N N N N N N N W W W W
SL/VL WIND SPD..0 0 0 0 0 0 0 0 2 2 2 3
SL/VL WIND GUST.1 1 1 1 1 2 2 2 5 5 5 7
RIDGE WIND DIR..E E NE NE NE W W W NW NW NW W
RIDGE WIND SPD..5 5 5 5 5 3 3 3 7 7 7 9
MIX HGT (KFT)...1.5 1.5 2.0 2.0 2.0 5.9 5.9 5.9 9.0 9.0 9.0 8.8
TRANSP WIND DIR.E E NE NE NE W W W NW NW NW W
TRANSP WIND SPD.5 5 5 5 5 3 3 3 7 7 7 9
FORECASTER...JW
REQUESTED BY...MICHAEL SPRINKLE
TYPE OF REQUEST...PRESCRIBED
.TAG 2611887.0/STO
.DELDT 04/27/26
.FORMATTERVERSION 2.0.0
.EMAIL MICHAEL.SPRINKLE@USDA.GOV
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