144
FNUS76 KSTO 152316
FWSSTO

Spot Forecast for CA-SHF Green Fire...Shasta Trinity National Forest
National Weather Service Sacramento CA
416 PM PDT Fri Aug 15 2025

Forecast is based on forecast start time of 1700 PDT on August 15.
If conditions become unrepresentative...contact the National Weather
Service.

...Slight chance of thunderstorms on Saturday and Sunday,
including Saturday night, in the vicinity of Shasta County...

.DISCUSSION...

Near to below normal temperatures continue tomorrow at the Green
Fire. A weather system moving through the area tomorrow will
introduce around a 15-35% chance of showers and thunderstorms
from tomorrow afternoon/evening into the overnight and through Sunday.
Best timing on arrival of the initial wave of precipitation looks
to be around 6pm tomorrow, then isolated storms thereafter. Storms do
look to be wet, however lightning strikes outside a storm`s core
could lead to possible fire starts. Gusty, erratic winds, small hail,
and brief heavy rain will be the other concerns. Winds tomorrow
will be from the west below 15 mph, then as the weather system arrives,
winds will shift from the south. Sunday t-storm chances are around 10% in
the morning and afternoon hours. A gradual warming and drying trend is
favored for next week.

.REST OF TODAY...

Sky/weather.........Sunny.
Max temperature.....92-96.
Min humidity........17-21 percent.
Wind (20 ft)........
 Slope/valley.......Southwest winds up to 5 mph.
 Ridgetop...........West around 12 mph.
Mixing height.......7200 ft AGL.
Transport winds.....West around 12 mph.
CWR.................1 percent.
Chance of thunder...2 percent.

TIME (PDT)      5 PM
Sky cover.......CLEAR
CWR.............0
Chc of thdr (%).0
Temp............93
RH..............20
SL/VL wind......SW 5G14
Ridgetop wind...SW 10
Mix hgt (ft)....7200
Transport wind..W 12

.TONIGHT...

Sky/weather.........Mostly clear.
Min temperature.....64-68.
Max humidity........57-61 percent.
Wind (20 ft)........
 Slope/valley.......Southwest winds up to 5 mph early in the
                    evening becoming light.
 Ridgetop...........West 6 to 12 mph shifting to the south around 2
                    mph late in the evening, then shifting to the
                    northeast 3 to 6 mph overnight.
Mixing height.......800 ft AGL.
Transport winds.....West around 12 mph decreasing to 6 to 12 mph in
                    the evening, then shifting to the south around
                    2 mph late in the evening shifting to the
                    northeast 3 to 6 mph overnight.
CWR.................2 percent.
Chance of thunder...2 percent.

TIME (PDT)      6 PM         10 PM        2 AM
Sky cover.......CLEAR        CLEAR        MCLEAR
CWR.............0            0            0
Chc of thdr (%).0            0            0
Temp............92           77           70
RH..............23           45           58
SL/VL wind......SW 5G13      W 2G8        N 2G7
Ridgetop wind...SW 10        SW 15        SW 20
Mix hgt (ft)....7200         800          800
Transport wind..W 12         W 6          N 3

.SATURDAY...

Sky/weather.........Sunny then becoming partly sunny. Slight chance
                    of showers late in the afternoon. Chance of
                    showers and slight chance of thunderstorms late
                    in the afternoon, evening and overnight.
Max temperature.....85-89.
Min humidity........37-41 percent.
Wind (20 ft)........
 Slope/valley.......Light winds becoming southwest up to 6 mph in
                    the afternoon. Gusty and erratic winds expected
                    near thunderstorms late in the afternoon.
 Ridgetop...........Northeast around 6 mph shifting to the south 3
                    to 8 mph early in the morning, then increasing
                    to southwest 15 to 16 mph late in the
                    afternoon.
Mixing height.......6900 ft AGL.
Transport winds.....Northeast around 6 mph shifting to the south 3
                    to 8 mph early in the morning, then increasing
                    to southwest 15 to 16 mph late in the
                    afternoon.
CWR.................6 percent.
Chance of thunder...23 percent.

TIME (PDT)      6 AM         10 AM        2 PM
Sky cover.......PCLDY        MCLEAR       PCLDY
CWR.............0            0            10
Chc of thdr (%).0            0            10
Temp............67           77           85
RH..............59           53           39
SL/VL wind......N 2G7        S 3G9        SW 6G15
Ridgetop wind...SW 20        SW 15        S 20
Mix hgt (ft)....800          2500         6900
Transport wind..NE 6         SE 3         S 16

$$
Forecaster...JW
Requested by...Hannah Haley
Type of request...WILDFIRE
.TAG 2519147.10/STO
.DELDT 08/15/25
.FormatterVersion 2.0.0
.EMAIL robert.holt@usda.gov,hannah.haley1@usda.gov