784 
FNUS76 KSTO 161645
FWSSTO

Spot Forecast for Big Hill 69...USFS
National Weather Service Sacramento CA
945 AM PDT Tue Sep 16 2025

Forecast is based on ignition time of 0700 PDT on September 18. 
If conditions become unrepresentative...contact the National Weather
Service.

...CHANCE OF THUNDERSTORMS THURSDAY THROUGH SATURDAY...

.DISCUSSION...
A surge of moisture will bring chances for showers and a 15 to 
25% chance of thunderstorm to the prescribed burn area beginning 
Thursday afternoon through Saturday. Highest thunderstorm chances 
are on Friday (20-25%), with a 20-40% chance of 0.25 inches or 
more of precipitation over the three day period. Winds will be 
terrain driven on Thursday, with east winds overnight 
transitioning to south by the afternoon. South to southeast winds 
increase on Friday with a 20-30% chance of gusts 20 mph or 
greater. 

Temperatures are expected to trend cooler with increasing 
humidity as the system pushes through. A brief warm up begins 
early next week, before cooler weather arrives mid to late next 
week. Beyond the 7-day period, model guidance hints at another 
weather system mid next week which could bring shower and 
thunderstorm chances but forecast confidence is low at this time. 

.THURSDAY...

Sky/weather.........Partly sunny. 
Max temperature.....72-76. 
Min humidity........20-24 percent. 
Wind (20 ft)........ 
 Slope/valley.......East winds 5 to 9 mph shifting to the south 5 
                    to 6 mph in the afternoon with gusts 15-20 mph. 
 Ridgetop...........Southeast around 9 mph. 
Mixing height.......8900 ft AGL. 
Transport winds.....Southeast around 9 mph. 
CWR.................1 percent. 
Chance of thunder...3 percent. 

.THURSDAY NIGHT...

Sky/weather.........Mostly cloudy. 
Min temperature.....53-57. 
Max humidity........56-60 percent. 
Wind (20 ft)........ 
 Slope/valley.......Southwest winds 5 to 6 mph shifting to the 
                    south 5 to 7 mph overnight with gusts 15-20 mph. 
 Ridgetop...........West around 9 mph. 
Mixing height.......0 ft AGL. 
Transport winds.....West around 9 mph. 
CWR.................7 percent. 
Chance of thunder...6 percent. 

.FRIDAY...

Sky/weather.........Partly sunny. Slight chance of rain showers in 
                    the morning, then chance of rain showers and 
                    slight chance of thunderstorms in the 
                    afternoon. 
Max temperature.....62-66. 
Min humidity........53-57 percent. 
Wind (20 ft)........ 
 Slope/valley.......Southeast winds 5 to 8 mph shifting to the 
                    southwest in the afternoon with gusts 15-20 mph. 
					Gusty and erratic 
                    winds expected near thunderstorms in the 
                    afternoon. 
 Ridgetop...........South around 7 mph. 
Mixing height.......3300 ft AGL. 
Transport winds.....South around 7 mph. 
CWR.................24 percent. 
Chance of thunder...15 percent. 

.FORECAST DAYS 6 THROUGH 7...

.TUESDAY...
Partly cloudy. Chance of showers and thunderstorms. Lows in the mid 50s. Highs in
the upper 60s. 

.WEDNESDAY...
Highs in the mid 60s. Lows in the lower 50s. 

.OUTLOOK FOR THURSDAY SEPTEMBER 25 THROUGH WEDNESDAY OCTOBER 01...
Beyond the 7-day period, near normal temperatures and slightly 
above normal precipitation are advertised by the Climate 
Prediction Center, however uncertainty persists regarding any 
appreciable impacts at this time as a result of this outlook. 

$$
Forecaster...KF
Requested by...Chris Enriquez
Type of request...PRESCRIBED
.TAG 2522031.0/STO
.DELDT 09/16/25
.FormatterVersion 2.0.0
.EMAIL Christian.enriquez@usda.gov