395
FNUS76 KSTO 190917
FWSSTO
SPOT FORECAST FOR CHALLENGE RX...USFS
NATIONAL WEATHER SERVICE SACRAMENTO CA
117 AM PST FRI DEC 19 2025
FORECAST IS BASED ON IGNITION TIME OF 0700 PST ON DECEMBER 19.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.
DISCUSSION
ACTIVE WEATHER RESUMES TODAY AND IS EXPECTED TO PERSIST OVER THE
WEEKEND AND AT LEAST THROUGH THE UPCOMING HOLIDAY PERIOD.
WIDESPREAD RAIN SHOWERS AND ISOLATED THUNDERSTORM CHANCES LOOK TO
CONTINUE THROUGH THE EVENING, WITH POTENTIAL FOR A BRIEF LULL
OVERNIGHT INTO EARLY SATURDAY MORNING BEFORE THE NEXT WAVE OF
PRECIPITATION ARRIVES LATER SATURDAY. RAINFALL TOTALS OF 2-3
INCHES ARE CURRENTLY FORECAST IN THE BURN AREA THROUGH SATURDAY
EVENING. SOUTHERLY WINDS ARE EXPECTED TO REMAIN BREEZY TO GUSTY
ACROSS THE FORECAST PERIOD, WITH STRONGEST GUSTS IN THE SHORT TERM
EXPECTED THROUGH THIS MORNING.
THERE IS HIGHER FORECAST UNCERTAINTY ON EXACT DETAILS INTO NEXT
WEEK, BUT PERIODS OF MODERATE TO HEAVY RAINFALL ARE LIKELY ALONGSIDE
ADDITIONAL POTENTIAL FOR GUSTY WINDS. CURRENT PROBABILITIES FOR
RAINFALL GREATER THAN 6 INCHES FROM SUNDAY THROUGH WEDNESDAY SIT
AROUND 50-80%, WITH 30-50% PROBABILITIES OF WIND GUSTS GREATER THAN
35 MPH SUNDAY INTO MONDAY.
TODAY
SKY/WEATHER.........CLOUDY. RAIN SHOWERS. SLIGHT CHANCE OF
THUNDERSTORMS IN THE AFTERNOON.
MAX TEMPERATURE.....47-52.
MIN HUMIDITY........95-100 PERCENT.
WIND (20 FT)........
SLOPE/VALLEY.......SOUTH WINDS 6 TO 9 MPH. GUSTS UP TO 20 MPH LATE
IN THE AFTERNOON.
RIDGETOP...........SOUTH 13 TO 15 MPH.
MIXING HEIGHT.......RISING TO NEAR 900 FT AGL.
TRANSPORT WINDS.....SOUTH 13 TO 15 MPH.
CWR.................72 PERCENT INCREASING TO 97 PERCENT IN THE LATE
MORNING AND EARLY AFTERNOON, THEN DECREASING TO
87 PERCENT LATE IN THE AFTERNOON.
CHANCE OF THUNDER...12 PERCENT IN THE AFTERNOON.
TIME (PST) 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY COVER.......CDY CDY CDY CDY CDY CDY CDY CDY CDY CDY CDY
CWR.............70 70 70 100 100 100 100 100 100 90 90
CHC OF THDR (%).0 0 0 0 0 0 10 10 10 10 10
TEMP............48 47 47 47 48 48 48 49 49 49 48
RH..............100 99 100 100 99 98 100 100 100 98 98
SL/VL WIND DIR..S S S S S S S S S S S
SL/VL WIND SPD..6 6 6 6 6 6 6 6 6 6 6
SL/VL WIND GUST.16 18 18 17 18 18 18 18 20 20 20
RIDGE WIND DIR..S S S S S S S S S S S
RIDGE WIND SPD..14 14 14 15 15 15 15 15 15 13 13
MIX HGT (KFT)...0.8 0.8 0.8 0.9 0.9 0.9 0.8 0.8 0.8 0.6 0.6
TRANSP WIND DIR.S S S S S S S S S S S
TRANSP WIND SPD.14 14 14 15 15 15 15 15 15 13 13
TONIGHT
SKY/WEATHER.........CLOUDY. RAIN SHOWERS IN THE EVENING AND
CHANCE OF RAIN SHOWERS OVERNIGHT.
MIN TEMPERATURE.....45-50.
MAX HUMIDITY........95-100 PERCENT.
WIND (20 FT)........
SLOPE/VALLEY.......SOUTH WINDS UP TO 6 MPH WITH GUSTS TO AROUND 20
MPH IN THE EVENING AND OVERNIGHT BECOMING
LIGHT.
RIDGETOP...........SOUTH 6 TO 13 MPH.
MIXING HEIGHT.......FALLING TO AROUND 300 FT AGL.
TRANSPORT WINDS.....SOUTH 6 TO 13 MPH.
CWR.................87 PERCENT DECREASING TO 50 PERCENT.
CHANCE OF THUNDER...12 PERCENT.
TIME (PST) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
SKY COVER.......CDY CDY CDY CDY CDY CDY CDY CDY CDY CDY CDY CDY
CWR.............90 90 90 90 60 60 60 60 60 60 50 50
CHC OF THDR (%).10 10 10 10 10 10 10 10 10 10 10 10
TEMP............49 49 49 50 50 50 51 51 51 51 50 50
RH..............100 100 100 100 100 100 99 99 99 99 99 99
SL/VL WIND DIR..S S S S S S S S S S S S
SL/VL WIND SPD..6 6 6 6 6 6 6 5 5 5 3 3
SL/VL WIND GUST.20 18 18 18 16 16 16 14 14 14 12 12
RIDGE WIND DIR..S S S S S S S S S S S S
RIDGE WIND SPD..13 12 12 12 12 12 12 10 10 10 6 6
MIX HGT (KFT)...0.6 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3
TRANSP WIND DIR.S S S S S S S S S S S S
TRANSP WIND SPD.13 12 12 12 12 12 12 10 10 10 6 6
SATURDAY
SKY/WEATHER.........CLOUDY. CHANCE OF RAIN SHOWERS EARLY IN THE
MORNING, THEN RAIN SHOWERS IN THE LATE MORNING
AND AFTERNOON.
MAX TEMPERATURE.....50-55.
MIN HUMIDITY........93-98 PERCENT.
WIND (20 FT)........
SLOPE/VALLEY.......LIGHT SOUTH WINDS.
RIDGETOP...........SOUTH 6 TO 8 MPH.
MIXING HEIGHT.......RISING TO NEAR 1000 FT AGL.
TRANSPORT WINDS.....SOUTH 6 TO 8 MPH.
CWR.................50 PERCENT INCREASING TO 96 PERCENT.
CHANCE OF THUNDER...8 PERCENT.
TIME (PST) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY COVER.......CDY CDY CDY CDY CDY CDY CDY CDY CDY CDY CDY CDY
CWR.............50 50 50 50 80 80 80 80 80 80 100 100
CHC OF THDR (%).10 10 10 10 10 10 10 10 10 10 0 0
TEMP............49 49 49 50 50 51 51 52 52 52 51 51
RH..............100 100 100 100 100 99 98 98 99 100 100 99
SL/VL WIND DIR..S S S S S S S S S S S S
SL/VL WIND SPD..3 3 3 3 3 3 3 3 3 3 2 2
SL/VL WIND GUST.12 10 10 10 12 12 12 12 12 12 9 9
RIDGE WIND DIR..SW SW SW SW SW SW S S S S S S
RIDGE WIND SPD..6 7 7 7 8 8 8 7 7 7 6 6
MIX HGT (KFT)...0.3 0.4 0.4 0.4 1.0 1.0 1.0 1.0 1.0 1.0 0.6 0.6
TRANSP WIND DIR.S S S S S S S S S S S S
TRANSP WIND SPD.6 7 7 7 8 8 8 7 7 7 6 6
FORECAST DAYS 3 THROUGH 5
SUNDAY
RAIN AND SLIGHT CHANCE OF THUNDERSTORMS. PERIODS OF HEAVY RAINFALL.
LOWS IN THE UPPER 40S. HIGHS IN THE LOWER 50S. SOUTH WINDS UP TO 10
MPH WITH GUSTS TO AROUND 22 MPH.
MONDAY
RAIN. PERIODS OF MODERATE TO HEAVY RAINFALL. LOWS IN THE UPPER 40S.
HIGHS IN THE LOWER 50S. SOUTH WINDS 12 MPH MPH WITH GUSTS UP TO 25
MPH EARLY, DECREASING TO 5 TO 7 MPH.
TUESDAY
SHOWERS AND SLIGHT CHANCE OF THUNDERSTORMS. LOWS IN THE MID 40S.
HIGHS IN THE LOWER 50S. SOUTH WINDS 7 TO 10 MPH.
FORECASTER...JW
REQUESTED BY...JASON MILLER
TYPE OF REQUEST...PRESCRIBED
.TAG 2527619.4/STO
.DELDT 12/19/25
.FORMATTERVERSION 2.0.0
.EMAIL BOBBY.HONROTH@USDA.GOV,JAMES.LICO@USDA.GOV,JASON.T.MILLER@USDA.GOV,MARK.CRESALIA@USDA.GOV
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