152
FNUS76 KSTO 202007
FWSSTO
SPOT FORECAST FOR TWAIN FIRE...USFS
NATIONAL WEATHER SERVICE SACRAMENTO CA
107 PM PDT MON JUL 20 2026
FORECAST IS BASED ON FORECAST START TIME OF 0600 PDT ON JULY 21.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.
DISCUSSION
MOSTLY SUNNY WITH A FEW PASSING CLOUDS AT THE TWAIN FIRE THE NEXT FEW
DAYS. MOSTLY TERRAIN DRIVEN WINDS WITH GUSTS BELOW 15 MPH. MONSOONAL
MOISTURE ALONG WITH REMNANTS OF A TROPICAL CYCLONE IN THE PACIFIC WILL
CONTINUE TO PUSH THROUGH THE AREA THE NEXT SEVERAL DAYS. NOT EXPECTING
RAIN OR THUNDERSTORMS OVER THE TWAIN FIRE, BUT A NON-ZERO CHANCE OF
AN AFTERNOON SHOWER OR THUNDERSTORM WILL REMAIN IN THE FORECAST THROUGH
AT LEAST WEDNESDAY. BETTER CHANCES WILL REMAIN SOUTH AND EAST OF THE
SIERRA CREST. TEMPERATURES LOOK TO REMAIN MOSTLY SEASONABLE FOR THE
NEXT SEVERAL DAYS, WITH SLIGHT FLUCTUATIONS OF A FEW DEGREES THE NEXT 5
DAYS.
TUESDAY
SKY/WEATHER.........MOSTLY SUNNY.
MAX TEMPERATURE.....86-96.
MIN HUMIDITY........29-33 PERCENT.
WIND (20 FT)........
SLOPE/VALLEY.......LIGHT WINDS BECOMING WEST UP TO 7 MPH IN THE
AFTERNOON.
RIDGETOP...........SOUTHWEST 5 TO 13 MPH DECREASING TO 3 TO 5 MPH
IN THE AFTERNOON.
MIXING HEIGHT.......7000 FT AGL.
TRANSPORT WINDS.....NORTHEAST AROUND 3 MPH SHIFTING TO THE SOUTH 2
TO 7 MPH EARLY IN THE MORNING, THEN SHIFTING TO
THE WEST 8 TO 9 MPH LATE IN THE AFTERNOON.
CWR.................1 PERCENT.
CHANCE OF THUNDER...3 PERCENT.
TIME (PDT) 6 AM 9 AM NOON 3 PM
SKY COVER.......PCLDY MCLEAR MCLEAR MCLEAR
CWR.............0 0 0 0
CHC OF THDR (%).0 0 0 0
TEMP............63 69 84 89
RH..............63 49 36 30
SL/VL WIND......NE 1G2 SE 2G3 W 3G7 W 6G13
RIDGETOP WIND...S 13 SW 9 SW 5 SW 3
MIX HGT (FT)....400 1600 5700 7000
TRANSPORT WIND..NE 3 S 2 SW 7 W 8
TUESDAY NIGHT
SKY/WEATHER.........PARTLY CLOUDY THEN BECOMING MOSTLY CLOUDY THEN
BECOMING PARTLY CLOUDY.
MIN TEMPERATURE.....62-66.
MAX HUMIDITY........63-73 PERCENT.
WIND (20 FT)........
SLOPE/VALLEY.......WEST WINDS 5 TO 6 MPH EARLY IN THE EVENING
BECOMING LIGHT.
RIDGETOP...........NORTHWEST AROUND 5 MPH SHIFTING TO THE
SOUTHEAST AROUND 7 MPH AFTER 3 AM.
MIXING HEIGHT.......300 FT AGL.
TRANSPORT WINDS.....WEST 5 TO 9 MPH SHIFTING TO THE NORTH AROUND 3
MPH OVERNIGHT.
CWR.................2 PERCENT.
CHANCE OF THUNDER...3 PERCENT.
TIME (PDT) 6 PM 9 PM MIDNGT 3 AM
SKY COVER.......MCLEAR PCLDY PCLDY MCLDY
CWR.............0 0 0 0
CHC OF THDR (%).0 0 0 0
TEMP............88 78 71 66
RH..............35 51 60 68
SL/VL WIND......W 6G13 SW 3G8 W 2G5 NE 1G2
RIDGETOP WIND...NW 5 NE 6 E 10 SE 7
MIX HGT (FT)....4800 400 300 400
TRANSPORT WIND..W 9 SW 7 W 5 N 3
WEDNESDAY
SKY/WEATHER.........SUNNY.
MAX TEMPERATURE.....87-97.
MIN HUMIDITY........29-33 PERCENT.
WIND (20 FT)........
SLOPE/VALLEY.......LIGHT WINDS BECOMING SOUTHWEST 5 TO 8 MPH LATE
IN THE AFTERNOON.
RIDGETOP...........SOUTH 8 TO 15 MPH.
MIXING HEIGHT.......8200 FT AGL.
TRANSPORT WINDS.....NORTHWEST AROUND 3 MPH SHIFTING TO THE
NORTHEAST EARLY IN THE MORNING, THEN SHIFTING
TO THE SOUTHWEST 7 TO 15 MPH LATE IN THE
MORNING.
CWR.................0 PERCENT.
CHANCE OF THUNDER...1 PERCENT.
TIME (PDT) 6 AM 9 AM NOON 3 PM
SKY COVER.......PCLDY MCLEAR CLEAR MCLEAR
CWR.............0 0 0 0
CHC OF THDR (%).0 0 0 0
TEMP............64 70 86 91
RH..............75 59 36 30
SL/VL WIND......NW 1G2 NE 1G2 SW 3G6 SW 7G16
RIDGETOP WIND...S 8 S 9 S 8 S 10
MIX HGT (FT)....400 700 5900 8200
TRANSPORT WIND..NW 3 NE 3 S 7 SW 12
FORECASTER...JW
REQUESTED BY...ISABELLA GIACOMANGELI
TYPE OF REQUEST...WILDFIRE
.TAG 2617670.3/STO
.DELDT 07/20/26
.FORMATTERVERSION 2.0.0
.EMAIL ISABELLA.GIACOMANGELI@USDA.GOV,JORDAN.TOWNSEND@USDA.GOV
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