600
FNUS76 KSGX 212339
FWSSGX
SPOT FORECAST FOR NORTH ARROWHEAD BURN...USFS
NATIONAL WEATHER SERVICE SAN DIEGO CA
339 PM PST WED JAN 21 2026
FORECAST IS BASED ON IGNITION TIME OF 0800 PST ON JANUARY 22.
IF CONDITIONS BECOME UNREPRESENTATIVE, CONTACT THE NATIONAL WEATHER
SERVICE.
DISCUSSION
A LOW PRESSURE SYSTEM PASSING TO THE SOUTH THIS WEEK WILL ALLOW
FOR INCREASING MOISTURE AND ONSHORE FLOW THROUGH FRIDAY. RELATIVE
HUMIDITY VALUES REACHING NEAR 100% BY FRIDAY MORNING WITH
INTERMITTENT FOG THROUGH THE DAY ON FRIDAY. SLIGHT CHANCE OF
SHOWERS (20-30%) FROM THURSDAY THROUGH SATURDAY. SLIGHT CHANCE OF
WETTING RAIN (10-20%) AS WELL, ESPECIALLY ON FRIDAY WHEN ISOLATED
HEAVIER SHOWERS MAY PRODUCE RAINFALL RATES UP TO 0.3"/HR.
THURSDAY
SKY/WEATHER.........MOSTLY CLOUDY (75-85 PERCENT) THEN BECOMING
PARTLY CLOUDY (40-50 PERCENT). SLIGHT CHANCE OF
RAIN SHOWERS IN THE LATE MORNING AND AFTERNOON.
MAX TEMPERATURE.....AROUND 51.
MIN HUMIDITY........46 PERCENT.
EYE LEVEL WINDS.....LIGHT WINDS.
WIND (20 FT)........
SLOPE/VALLEY.......LIGHT WINDS.
RIDGETOP...........SOUTH 5 TO 10 MPH.
CWR.................12 PERCENT INCREASING TO 15 PERCENT LATE IN THE
AFTERNOON.
MIXING HEIGHT.......1500 FT AGL.
TRANSPORT WINDS.....SOUTH 3 TO 5 MPH.
TIME (PST) 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........91 91 79 79 79 71 71 71 47 47
WEATHER COV..... SCH SCH SCH SCH SCH SCH SCH SCH
WEATHER TYPE.... RW RW RW RW RW RW RW RW
TSTM COV........
TEMP............45 49 50 51 50 50 50 50 49 47
RH..............53 48 46 48 53 57 61 62 68 74
20 FT WIND DIR..S S S S SW S S S S SE
20 FT WIND SPD..3 3 2 2 2 2 3 2 2 1
20 FT WIND GUST.7 6 6 6 6 6 7 6 6 5
EYE LVL WND DIR.S S S S SW S S S S SE
EYE LVL WND SPD.2 2 1 1 1 1 2 1 1 1
EYE LVL WND GST.3 3 3 3 3 3 3 3 3 3
RIDGE WIND DIR..S S S S S S S S S S
RIDGE WIND SPD..10 5 10 10 10 10 10 10 10 5
CWR.............0 0 10 10 10 10 10 10 20 20
THURSDAY NIGHT
SKY/WEATHER.........PARTLY CLOUDY (50-60 PERCENT). SLIGHT CHANCE OF
RAIN SHOWERS IN THE EVENING AND OVERNIGHT.
MIN TEMPERATURE.....AROUND 39.
MAX HUMIDITY........98 PERCENT.
EYE LEVEL WINDS.....LIGHT WINDS.
WIND (20 FT)........
SLOPE/VALLEY.......LIGHT WINDS.
RIDGETOP...........SOUTH 5 TO 10 MPH.
CWR.................15 PERCENT.
MIXING HEIGHT.......100 FT AGL.
TRANSPORT WINDS.....SOUTH 6 TO 8 MPH.
TIME (PST) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
SKY (%).........47 47 47 47 63 63 63 63 63 63 58 58
WEATHER COV.....SCH SCH SCH SCH SCH SCH SCH SCH SCH SCH
WEATHER TYPE....RW RW RW RW RW RW RW RW RW RW
TSTM COV........
TEMP............45 44 43 42 43 44 42 42 43 44 41 39
RH..............79 79 80 85 80 78 86 86 83 82 90 98
20 FT WIND DIR..SE S S S S S S S S S S S
20 FT WIND SPD..2 2 2 2 3 3 3 3 3 2 2 2
20 FT WIND GUST.6 6 6 6 7 8 8 7 7 6 6 6
EYE LVL WND DIR.SE S S S S S S S S S S S
EYE LVL WND SPD.1 1 1 1 2 2 2 2 2 1 1 1
EYE LVL WND GST.3 3 3 3 3 4 4 3 3 3 3 3
RIDGE WIND DIR..S S S S S S S S S S S S
RIDGE WIND SPD..5 5 5 5 5 5 5 10 10 10 5 5
CWR.............20 20 20 20 10 10 10 10 10 10 10 10
FRIDAY
SKY/WEATHER.........PARTLY CLOUDY (55-65 PERCENT). SLIGHT CHANCE OF
RAIN SHOWERS IN THE LATE MORNING AND AFTERNOON.
MAX TEMPERATURE.....AROUND 48.
MIN HUMIDITY........81 PERCENT.
EYE LEVEL WINDS.....LIGHT WINDS.
WIND (20 FT)........
SLOPE/VALLEY.......LIGHT WINDS BECOMING SOUTH AROUND 5 MPH IN THE
AFTERNOON.
RIDGETOP...........SOUTH 5 TO 10 MPH.
CWR.................12 PERCENT.
MIXING HEIGHT.......2100 FT AGL.
TRANSPORT WINDS.....SOUTH 5 TO 8 MPH.
TIME (PST) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........58 58 58 58 62 62 62 62 62 62 54 54
WEATHER COV..... SCH SCH SCH SCH SCH SCH SCH SCH
WEATHER TYPE.... RW RW RW RW RW RW RW RW
TSTM COV........
TEMP............41 40 41 43 44 47 45 43 45 46 42 45
RH..............90 94 92 89 91 81 90 94 90 86 97 86
20 FT WIND DIR..S S S S S S S S S S S S
20 FT WIND SPD..1 2 2 2 2 3 3 3 5 5 5 5
20 FT WIND GUST.5 5 6 6 6 7 7 8 8 8 8 9
EYE LVL WND DIR.S S S S S S S S S S S S
EYE LVL WND SPD.1 1 1 1 1 2 2 2 2 2 2 2
EYE LVL WND GST.2 2 3 3 3 3 3 4 4 4 4 4
RIDGE WIND DIR..S S S S S S S S S S S M
RIDGE WIND SPD..5 5 5 5 5 5 10 10 10 10 10 M
CWR.............10 10 10 10 10 10 10 10 10 10 10 10
FORECASTER...KYLE WHEELER
REQUESTED BY...LAWRENCE COLLINS
TYPE OF REQUEST...PRESCRIBED
.TAG 2600832.0/SGX
.DELDT 01/21/26
.FORMATTERVERSION 2.0.0
.EMAIL LAWRENCE.COLLINS@USDA.GOV
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