635
FNUS76 KSGX 221230
FWSSGX
SPOT FORECAST FOR JEFF VALLEY UNITS 6 AND 4...USFS
NATIONAL WEATHER SERVICE SAN DIEGO CA
430 AM PST THU JAN 22 2026
FORECAST IS BASED ON IGNITION TIME OF 0600 PST ON JANUARY 22.
IF CONDITIONS BECOME UNREPRESENTATIVE, CONTACT THE NATIONAL WEATHER
SERVICE.
DISCUSSION
INCREASING HUMIDITY TODAY WITH WEAK SOUTHWEST WINDS. INCREASING
CHANCE OF WETTING RAIN TODAY WITH A 15-25% CHANCE THROUGH SATURDAY.
EXCELLENT HUMIDITY RECOVERY TONIGHT AND QUITE HUMID FRIDAY THROUGH
SATURDAY. INCREASE IN ONSHORE BREEZES LATE FRIDAY THROUGH SATURDAY.
OFFSHORE FLOW SATURDAY NIGHT WILL BRING MUCH LOWER HUMIDITY SUNDAY
WITH WEAK NORTHEAST BREEZES. THIS DRIER, WEAK OFFSHORE PATTERN
CONTINUES MONDAY.
TODAY
SKY/WEATHER.........MOSTLY CLOUDY (75-85 PERCENT). SLIGHT CHANCE OF
RAIN SHOWERS EARLY IN THE MORNING, THEN CHANCE
OF RAIN SHOWERS IN THE LATE MORNING AND
AFTERNOON.
MAX TEMPERATURE.....AROUND 53.
MIN HUMIDITY........35 PERCENT.
EYE LEVEL WINDS.....LIGHT WINDS BECOMING SOUTHWEST AROUND 4 MPH IN
THE LATE MORNING AND EARLY AFTERNOON, THEN
BECOMING LIGHT LATE IN THE AFTERNOON.
WIND (20 FT)........
SLOPE/VALLEY.......LIGHT WINDS BECOMING SOUTHWEST AROUND 5 MPH IN
THE LATE MORNING AND EARLY AFTERNOON, THEN
BECOMING LIGHT LATE IN THE AFTERNOON.
RIDGETOP...........SOUTH 5 TO 10 MPH SHIFTING TO THE SOUTHWEST
LATE IN THE AFTERNOON.
CWR.................13 PERCENT INCREASING TO 24 PERCENT IN THE LATE
MORNING AND AFTERNOON.
MIXING HEIGHT.......1500 FT AGL.
TRANSPORT WINDS.....SOUTHEAST AROUND 5 MPH SHIFTING TO THE WEST 3
TO 6 MPH IN THE AFTERNOON.
TIME (PST) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........77 78 78 78 82 82 82 83 83 83 75 75
WEATHER COV.....SCH SCH SCH SCH CHC CHC CHC CHC CHC CHC CHC CHC
WEATHER TYPE....RW RW RW RW RW RW RW RW RW RW RW RW
TSTM COV........
TEMP............46 46 47 48 50 50 50 52 50 49 47 45
RH..............36 35 35 37 39 43 50 52 62 63 70 81
20 FT WIND DIR..S SW SW S S SW SW SW SW W SW SW
20 FT WIND SPD..1 1 1 3 5 5 5 5 5 2 3 2
20 FT WIND GUST.4 4 4 7 8 8 9 9 8 6 6 6
EYE LVL WND DIR.S SW SW S S SW SW SW SW W SW SW
EYE LVL WND SPD.1 1 1 2 3 3 4 4 3 1 2 1
EYE LVL WND GST.3 3 3 5 6 6 7 7 6 5 5 4
RIDGE WIND DIR..S S S S S S SW SW SW W SW SW
RIDGE WIND SPD..5 10 5 5 10 5 5 10 5 5 10 5
CWR.............10 10 10 10 20 20 20 20 20 20 20 20
TONIGHT
SKY/WEATHER.........MOSTLY CLOUDY (70-80 PERCENT) THEN BECOMING
PARTLY CLOUDY (45-55 PERCENT). CHANCE OF RAIN
SHOWERS IN THE EVENING AND OVERNIGHT.
MIN TEMPERATURE.....AROUND 42.
MAX HUMIDITY........89 PERCENT.
EYE LEVEL WINDS.....LIGHT WINDS.
WIND (20 FT)........
SLOPE/VALLEY.......LIGHT WINDS.
RIDGETOP...........SOUTHWEST 5 TO 10 MPH.
CWR.................20 PERCENT DECREASING TO 6 PERCENT AFTER 3 AM.
MIXING HEIGHT.......100 FT AGL.
TRANSPORT WINDS.....SOUTH 2 TO 3 MPH.
TIME (PST) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
SKY (%).........75 72 72 72 63 63 63 63 63 63 38 38
WEATHER COV.....CHC CHC CHC CHC CHC CHC CHC CHC CHC CHC
WEATHER TYPE....RW RW RW RW RW RW RW RW RW RW
TSTM COV........
TEMP............44 45 45 44 44 44 43 43 43 43 43 43
RH..............79 77 75 73 76 79 81 83 86 87 89 89
20 FT WIND DIR..SW SW SW SW SW SW W W W W W W
20 FT WIND SPD..1 1 2 2 2 2 2 2 2 2 2 2
20 FT WIND GUST.5 4 5 6 6 6 6 6 6 6 6 6
EYE LVL WND DIR.SW SW SW SW SW SW W W W W W W
EYE LVL WND SPD.1 1 1 1 2 1 1 1 1 1 1 1
EYE LVL WND GST.4 3 4 4 5 5 4 4 4 5 5 4
RIDGE WIND DIR..S SW S S SW S SW SW SW SW SW SW
RIDGE WIND SPD..5 5 5 5 5 5 5 10 5 5 5 5
CWR.............20 20 20 20 20 20 20 20 20 20 10 10
FRIDAY
SKY/WEATHER.........PARTLY CLOUDY (45-55 PERCENT) THEN BECOMING
MOSTLY CLOUDY (65-75 PERCENT). CHANCE OF RAIN
SHOWERS IN THE LATE MORNING AND EARLY
AFTERNOON. SLIGHT CHANCE OF RAIN SHOWERS LATE
IN THE AFTERNOON.
MAX TEMPERATURE.....AROUND 49.
MIN HUMIDITY........83 PERCENT.
EYE LEVEL WINDS.....LIGHT WINDS BECOMING WEST AROUND 4 MPH.
WIND (20 FT)........
SLOPE/VALLEY.......WEST WINDS AROUND 5 MPH EARLY IN THE MORNING
BECOMING LIGHT, THEN BECOMING SOUTHWEST AROUND
5 MPH EARLY IN THE AFTERNOON SHIFTING TO THE
WEST.
RIDGETOP...........SOUTHWEST AROUND 5 MPH SHIFTING TO THE WEST
LATE IN THE AFTERNOON.
CWR.................6 PERCENT INCREASING TO 18 PERCENT IN THE LATE
MORNING AND AFTERNOON.
MIXING HEIGHT.......1600 FT AGL.
TRANSPORT WINDS.....SOUTH 2 TO 5 MPH SHIFTING TO THE WEST 5 TO 6
MPH IN THE AFTERNOON.
TIME (PST) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........38 43 43 43 66 66 66 66 66 66 70 70
WEATHER COV..... CHC CHC CHC CHC CHC CHC SCH SCH
WEATHER TYPE.... RW RW RW RW RW RW RW RW
TSTM COV........
TEMP............43 43 43 45 46 47 48 48 47 46 45 44
RH..............87 85 89 88 84 83 84 85 88 91 93 93
20 FT WIND DIR..W W W SW S S S S SW W W W
20 FT WIND SPD..2 2 2 3 3 3 3 3 5 5 5 5
20 FT WIND GUST.6 5 6 6 7 7 7 8 8 9 9 9
EYE LVL WND DIR.W W W SW S S S S SW W W W
EYE LVL WND SPD.1 1 1 2 2 3 3 3 3 4 4 4
EYE LVL WND GST.4 4 4 5 5 5 5 6 6 7 7 7
RIDGE WIND DIR..SW S S S S S SW SW W W W W
RIDGE WIND SPD..5 5 5 5 5 5 5 5 5 5 5 5
CWR.............10 10 10 10 20 20 20 20 20 20 10 10
FORECAST DAYS 3 THROUGH 5
SATURDAY
PARTLY CLOUDY. SLIGHT CHANCE OF SHOWERS. LOWS IN THE LOWER 40S.
HIGHS IN THE UPPER 40S. WEST WINDS AROUND 5 MPH AT EYE LEVEL.
SUNDAY
PARTLY CLOUDY. LOWS IN THE MID 30S. HIGHS IN THE UPPER 40S.
NORTHEAST WINDS AROUND 6 MPH AT EYE LEVEL.
MONDAY
PARTLY CLOUDY. LOWS IN THE UPPER 30S. HIGHS IN THE LOWER 50S.
EAST WINDS AROUND 6 MPH AT EYE LEVEL.
FORECASTER...MIGUEL MILLER
REQUESTED BY...JASON MCAHREN
TYPE OF REQUEST...PRESCRIBED
.TAG 2600860.0/SGX
.DELDT 01/22/26
.FORMATTERVERSION 2.0.0
.EMAIL JASON.MCAHREN@USDA.GOV,CHRITOPHER.BRENZEL@USDA.GOV
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