112
FNUS76 KSTO 080103
FWSSTO
SPOT FORECAST FOR CHALLENGE RX...USFS
NATIONAL WEATHER SERVICE SACRAMENTO CA
603 PM PDT THU MAY 7 2026
FORECAST IS BASED ON IGNITION TIME OF 0600 PDT ON MAY 08.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.
DISCUSSION
DRY CONDITIONS WITH A WARMING TREND INTO EARLY NEXT WEEK IS
EXPECTED. DIURNAL, TERRAIN-DRIVEN WINDS THROUGH THE WEEKEND WITH
OCCASIONAL BREEZY AFTERNOON WINDS UP TO 10-15 MPH. NO
PRECIPITATION IS FORECASTED AT THIS WITH DAYTIME HUMIDITY VALUES
IN THE 40S, LOWERING TO 20S BY MONDAY-TUESDAY. THAT PERIOD WILL
ALSO BE THE HOTTEST STRETCH OVER THE NEXT SEVERAL DAYS.
FRIDAY
SKY/WEATHER.........SUNNY.
MAX TEMPERATURE.....67-71.
MIN HUMIDITY........34-38 PERCENT.
WIND (20 FT)........
SLOPE/VALLEY.......LIGHT WINDS BECOMING WEST 5 TO 9 MPH IN THE
AFTERNOON WITH GUSTS UP TO 15 MPH.
RIDGETOP...........LIGHT WINDS SHIFTING TO THE WEST 9 TO 14 MPH
BY THE AFTERNOON.
MIXING HEIGHT.......5500 FT AGL.
TRANSPORT WINDS.....SOUTH AROUND 5 MPH SHIFTING TO THE WEST 9 TO 14
MPH BY THE AFTERNOON.
CWR.................0 PERCENT.
CHANCE OF THUNDER...0 PERCENT.
TIME (PDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY COVER.......CLR MCR CLR MCR MCR MCR CLR CLR CLR CLR CLR CLR
TEMP............46 48 51 52 57 61 65 66 67 68 68 68
RH..............55 52 53 51 51 44 39 36 36 36 36 38
SL/VL WIND DIR..E E E E W W W W W W W W
SL/VL WIND SPD..0 0 0 1 3 6 6 7 7 7 7 6
SL/VL WIND GUST.5 5 5 6 9 12 13 14 15 15 15 15
RIDGE WIND DIR..E E E E W W W W W W W W
RIDGE WIND SPD..5 5 6 6 6 10 10 10 12 12 12 10
MIX HGT (KFT)...0.4 0.4 1.7 1.7 1.7 5.0 5.0 5.0 5.5 5.5 5.5 3.3
TRANSP WIND DIR.E E E E W W W W W W W W
TRANSP WIND SPD.5 5 6 6 6 10 10 10 12 12 12 10
FRIDAY NIGHT
SKY/WEATHER.........CLEAR.
MIN TEMPERATURE.....45-49.
MAX HUMIDITY........60-64 PERCENT.
WIND (20 FT)........
SLOPE/VALLEY.......WEST WINDS 5 TO 8 MPH EARLY IN THE EVENING WITH
GUSTS UP TO 15 MPH BECOMING LIGHT.
RIDGETOP...........WEST 6 TO 11 MPH SHIFTING TO THE NORTHEAST 6 TO
10 MPH LATE IN THE EVENING.
MIXING HEIGHT.......500 FT AGL.
TRANSPORT WINDS.....WEST 6 TO 11 MPH SHIFTING TO THE NORTHEAST 6 TO
10 MPH LATE IN THE EVENING.
CWR.................0 PERCENT.
CHANCE OF THUNDER...0 PERCENT.
TIME (PDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
SKY COVER.......CLR CLR MCR MCR MCR MCR MCR MCR CLR CLR CLR CLR
TEMP............67 65 63 58 56 55 53 52 51 49 49 48
RH..............38 46 51 55 56 58 57 57 58 61 61 62
SL/VL WIND DIR..W W W W W N N N E E E E
SL/VL WIND SPD..6 6 1 1 1 0 0 0 1 1 1 2
SL/VL WIND GUST.15 15 7 7 7 5 5 5 7 7 7 8
RIDGE WIND DIR..W W W W W N N N NE NE NE NE
RIDGE WIND SPD..10 10 6 6 6 6 6 6 8 8 8 9
MIX HGT (KFT)...3.3 3.3 0.6 0.6 0.6 0.5 0.5 0.5 0.5 0.5 0.5 0.5
TRANSP WIND DIR.W W W W W N N N NE NE NE NE
TRANSP WIND SPD.10 10 6 6 6 6 6 6 8 8 8 9
SATURDAY
SKY/WEATHER.........SUNNY.
MAX TEMPERATURE.....73-77.
MIN HUMIDITY........25-29 PERCENT.
WIND (20 FT)........
SLOPE/VALLEY.......LIGHT WINDS BECOMING SOUTHWEST 4 TO 7 MPH
IN THE AFTERNOON.
RIDGETOP...........EAST 6 TO 10 MPH SHIFTING TO THE SOUTHWEST
AROUND 7 TO 11 MPH IN THE AFTERNOON.
MIXING HEIGHT.......7700 FT AGL.
TRANSPORT WINDS.....EAST 8 TO 10 MPH SHIFTING TO THE SOUTHWEST
AROUND 8 MPH IN THE AFTERNOON.
CWR.................0 PERCENT.
CHANCE OF THUNDER...0 PERCENT.
TIME (PDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY COVER.......CLR CLR CLR CLR CLR CLR CLR CLR CLR CLR CLR CLR
TEMP............47 49 52 55 59 63 67 70 73 74 74 73
RH..............61 59 55 50 44 38 33 29 27 26 26 29
SL/VL WIND DIR..E E E E E E E SE SE SW SW SW
SL/VL WIND SPD..2 2 3 3 3 6 6 6 6 6 6 5
SL/VL WIND GUST.8 8 9 9 9 12 12 12 12 12 12 12
RIDGE WIND DIR..E E E E E E E SE SE SW SW SW
RIDGE WIND SPD..9 9 10 10 10 10 10 10 8 8 8 8
MIX HGT (KFT)...0.5 0.5 0.7 0.7 0.7 4.3 4.3 4.3 7.7 7.7 7.7 6.6
TRANSP WIND DIR.E E E E E E E SE SE SW SW SW
TRANSP WIND SPD.9 9 10 10 10 10 10 10 8 8 8 8
FORECAST DAYS 3 THROUGH 5
SUNDAY
MOSTLY CLEAR. LOWS IN THE LOWER 60S. HIGHS AROUND 80. LIGHT
WINDS.
MONDAY
MOSTLY CLEAR. LOWS IN THE LOWER 60S. HIGHS IN THE MID 80S. LIGHT
WINDS.
TUESDAY
MOSTLY CLEAR. LOWS IN THE MID 60S. HIGHS IN THE MID 80S. LIGHT
WINDS.
FORECASTER...DA
REQUESTED BY...JASON MILLER
TYPE OF REQUEST...PRESCRIBED
.TAG 2613009.1/STO
.DELDT 05/08/26
.FORMATTERVERSION 2.0.0
.EMAIL JESSE.STEVENS@USDA.GOV,JAMES.LICO@USDA.GOV,JASON.T.MILLER@USDA.GOV
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