253
FNUS76 KSTO 172309
FWSSTO

Spot Forecast for CA-SHF Green Fire...Shasta Trinity National Forest
National Weather Service Sacramento CA
409 PM PDT Sun Aug 17 2025

Forecast is based on forecast start time of 1700 PDT on August 17.
If conditions become unrepresentative...contact the National Weather
Service.

.DISCUSSION...
Warmer and drier weather expected this week across the region.
Humidity recovery trends back toward poor to moderate near the
Green Fire with daytime minimum humidity falling into the 20s on
Monday, then teens the remainder of the week. Diurnal wind trends
to persist with light and terrain influenced winds late evening
into the early morning becoming breezier from the south-southwest
late morning into the afternoon.

.REST OF TODAY...

Sky/weather.........Mostly sunny.
Max temperature.....77-87.
Min humidity........36-40 percent.
Wind (20 ft)........
 Slope/valley.......South winds 7 to 10 mph. Gusts up to 18 mph
                    at times.
 Ridgetop...........South around 15 mph.
Mixing height.......Near 4800 ft AGL.
Transport winds.....South around 15 mph.
CWR.................0 percent.
Chance of thunder...0 percent.

TIME (PDT)      5 PM
Sky cover.......MCLEAR
CWR.............0
Chc of thdr (%).0
Temp............82
RH..............41
SL/VL wind......S 8G18
Ridgetop wind...S 15
Mix hgt (ft)....4800
Transport wind..S 15

.TONIGHT...

Sky/weather.........Mostly clear.
Min temperature.....54-59.
Max humidity........65-73 percent.
Wind (20 ft)........
 Slope/valley.......South winds up to 8 mph in the evening and
                    overnight becoming light. Gusts up to 18 mph
                    early in the evening.
 Ridgetop...........Southwest 6 to 15 mph shifting to the north
                    around 5 mph early in the morning.
Mixing height.......Falling to below 100 ft AGL overnight.
Transport winds.....Southwest 6 to 15 mph shifting to the north
                    around 5 mph early in the morning.
CWR.................0 percent.
Chance of thunder...0 percent.

TIME (PDT)      6 PM         10 PM        2 AM
Sky cover.......MCLEAR       MCLEAR       PCLDY
CWR.............0            0            0
Chc of thdr (%).0            0            0
Temp............81           71           65
RH..............40           53           62
SL/VL wind......S 8G18       S 6G8        S 5G6
Ridgetop wind...S 15         S 10         SW 6
Mix hgt (ft)....4800         BLW100       BLW100
Transport wind..S 15         S 10         SW 6

.MONDAY...

Sky/weather.........Sunny.
Max temperature.....80-85.
Min humidity........20-25 percent.
Wind (20 ft)........
 Slope/valley.......Light winds becoming southwest 6 to 8 mph by
                    late morning.
 Ridgetop...........North around 5 mph shifting to the southwest
                    early in the morning, then shifting to the
                    south 12 to 15 mph late in the afternoon.
Mixing height.......Rising to near 4200 ft AGL.
Transport winds.....North around 5 mph shifting to the southwest
                    early in the morning, then shifting to the
                    south 12 to 15 mph late in the afternoon.
CWR.................0 percent.
Chance of thunder...0 percent.

TIME (PDT)      6 AM         10 AM        2 PM
Sky cover.......MCLEAR       CLEAR        CLEAR
CWR.............0            0            0
Chc of thdr (%).0            0            0
Temp............58           69           80
RH..............71           52           29
SL/VL wind......N 3G5        SW 5G10      SW 6G15
Ridgetop wind...N 5          SW 3         S 15
Mix hgt (ft)....BLW100       1100         4200
Transport wind..N 5          SW 3         S 15

$$
Forecaster...NR
Requested by...Robert Holt
Type of request...WILDFIRE
.TAG 2520034.0/STO
.DELDT 08/17/25
.FormatterVersion 2.0.0
.EMAIL robert.holt@usda.gov