101
FNUS76 KSTO 212228
FWSSTO

Spot Forecast for Twain Fire...USFS
National Weather Service Sacramento CA
328 PM PDT Tue Jul 21 2026

Forecast is based on forecast start time of 0600 PDT on July 22.
If conditions become unrepresentative...contact the National Weather
Service.

.DISCUSSION...
Precipitation is not expected over the next several days with
activity east of the Sierra crest but Wednesday will see a
slight increase in moisture before a drying trend into the mid to
upper teens by late week. Winds trend stronger Wednesday with
afternoon south gusts up to 20-30 mph and strongest winds expected
from around 2 PM to 8 PM. Similar temperatures each day with
afternoon highs generally in the 90s.

.WEDNESDAY...

Sky/weather.........Sunny.
Max temperature.....90-97.
Min humidity........34-38 percent.
Wind (20 ft)........
 Slope/valley.......Light winds becoming south 9 to 15 mph
                    in the afternoon with gusts up to 15-25 mph.
 Ridgetop...........Light winds becoming south 8 to 14 mph.
Mixing height.......6100 ft AGL.
Transport winds.....East around 3 mph shifting to the south 7 to 14
                    mph late in the morning.
CWR.................0 percent.
Chance of thunder...1 percent.

TIME (PDT)      6 AM      9 AM      NOON      3 PM
Sky cover.......MCLEAR    CLEAR     CLEAR     CLEAR
CWR.............0         0         0         0
Chc of thdr (%).0         0         0         0
Temp............63        70        84        87
RH..............77        59        41        36
SL/VL wind......NE 1G2    SE 2G5    W 6G13    S 10G20
Ridgetop wind...E 3       S 5       S 10      S 13
Mix hgt (ft)....400       1900      5700      6100
Transport wind..E 3       S 5       S 9       S 14

.WEDNESDAY NIGHT...

Sky/weather.........Mostly clear.
Min temperature.....55-59.
Max humidity........85-89 percent.
Wind (20 ft)........
 Slope/valley.......Southwest winds 8 to 13 mph in the evening
                    becoming light.
 Ridgetop...........South 10 to 15 mph becoming northeast winds
                    around 5 mph.
Mixing height.......300 ft AGL.
Transport winds.....Southwest 8 to 14 mph becoming light northeast
                    overnight.
CWR.................0 percent.
Chance of thunder...0 percent.

TIME (PDT)      6 PM      9 PM      MIDNGT    3 AM
Sky cover.......CLEAR     MCLEAR    MCLEAR    MCLEAR
Temp............85        73        66        60
RH..............41        60        75        85
SL/VL wind......SW 8G18   SW 5G12   S 2G3     NE 1G2
Ridgetop wind...SW 14     SW 8      SW 3      NE 3
Mix hgt (ft)....4600      700       300       400
Transport wind..SW 14     SW 8      SW 3      NE 3

.THURSDAY...

Sky/weather.........Sunny.
Max temperature.....90-98.
Min humidity........18-22 percent.
Wind (20 ft)........
 Slope/valley.......Light winds becoming southwest 5 to 8 mph late
                    in the afternoon.
 Ridgetop...........Light northeast winds becoming south to west
                    winds 7 to 12 mph by the afternoon.
Mixing height.......6000 ft AGL.
Transport winds.....Light northeast winds becoming south to west
                    winds 7 to 12 mph by the afternoon.
CWR.................0 percent.
Chance of thunder...0 percent.

TIME (PDT)      6 AM      9 AM      NOON      3 PM
Sky cover.......MCLEAR    CLEAR     CLEAR     CLEAR
CWR.............0         0         0         0
Chc of thdr (%).0         0         0         0
Temp............57        66        84        91
RH..............87        65        27        18
SL/VL wind......NE 1G2    NE 1G2    SW 3G8    SW 7G16
Ridgetop wind...NE 2      SE 4      S 7       SW 12
Mix hgt (ft)....400       700       4100      6000
Transport wind..NE 2      SE 3      S 8       SW 12

.FORECAST DAYS 3 THROUGH 5...
.FRIDAY...
Clear. Lows in the mid 50s. Highs in the lower 90s. Light winds.
.SATURDAY...
Clear. Lows in the mid 50s. Highs around 90. Light winds.
.SUNDAY...
Clear. Lows in the mid 50s. Highs around 90. Light winds.

$$
Forecaster...DA
Requested by...Isabella Giacomangeli
Type of request...WILDFIRE
.TAG 2617670.4/STO
.DELDT 07/21/26
.FormatterVersion 2.0.0
.EMAIL isabella.giacomangeli@usda.gov,jordan.townsend@usda.gov