384
FNUS76 KSTO 200028
FWSSTO
SPOT FORECAST FOR TWAIN FIRE...USFS
NATIONAL WEATHER SERVICE SACRAMENTO CA
528 PM PDT SUN JUL 19 2026
FORECAST IS BASED ON FORECAST START TIME OF 0600 PDT ON JULY 20.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.
DISCUSSION
ON MONDAY, THUNDERSTORM POTENTIAL IS LOWER COMPARED TO SUNDAY,
BUT THERE REMAINS A NONZERO (5-10%) CHANCE FOR ISOLATED SHOWERS
AND THUNDERSTORMS EARLY IN THE MORNING WITH ADDITIONAL CHANCES IN
THE AFTERNOON. SIMILAR CHANCES (5-10%) FOR THUNDERSTORMS/SHOWERS
ON TUESDAY AND WEDNESDAY, BUT MOST OF THE ACTIVITY SHOULD STAY
EAST OF THE CREST AND AWAY FROM THE FIRE.
AS MONSOONAL MOISTURE PUSHES INTO THE AREA, MINIMUM RELATIVE
HUMIDITIES TREND HIGHER THROUGH MID WEEK STAYING IN THE MID TO
UPPER 20S WITH IMPROVED OVERNIGHT HUMIDITIES IN THE 60S AND 70S.
WINDS WILL BE LIGHT AND DIURNALLY DRIVEN WITH WEST-SOUTHWEST
GUSTS TO 15 MPH AT TIMES, BUT GUSTY AND ERRATIC WINDS ARE POSSIBLE
WITH ANY THUNDERSTORMS THAT DEVELOP.
MONDAY
SKY/WEATHER.........MOSTLY SUNNY.
MAX TEMPERATURE.....84-94.
MIN HUMIDITY........22-25 PERCENT.
WIND (20 FT)........
SLOPE/VALLEY.......LIGHT WINDS BECOMING SOUTHWEST UP 7 MPH IN
THE AFTERNOON WITH GUSTS TO 15 MPH.
RIDGETOP...........SOUTH AROUND 7 MPH.
MIXING HEIGHT.......5700 FT AGL.
TRANSPORT WINDS.....SOUTH AROUND 7 MPH.
CWR.................1 PERCENT.
CHANCE OF THUNDER...5-10 PERCENT.
MONDAY NIGHT
SKY/WEATHER.........PARTLY CLOUDY.
MIN TEMPERATURE.....61-65.
MAX HUMIDITY........59-63 PERCENT.
WIND (20 FT)........
SLOPE/VALLEY.......SOUTHWEST WINDS UP TO 6 MPH WITH GUSTS TO 15 MPH IN THE EVENING
BECOMING LIGHT.
RIDGETOP...........WEST AROUND 5 MPH.
MIXING HEIGHT.......300 FT AGL.
TRANSPORT WINDS.....WEST AROUND 5 MPH.
CWR.................2 PERCENT.
CHANCE OF THUNDER...5 PERCENT.
TUESDAY
SKY/WEATHER.........MOSTLY SUNNY.
MAX TEMPERATURE.....86-96.
MIN HUMIDITY........26-30 PERCENT.
WIND (20 FT)........
SLOPE/VALLEY.......LIGHT WINDS BECOMING SOUTHWEST UP TO 6 MPH IN
THE AFTERNOON WITH GUSTS TO 15 MPH.
RIDGETOP...........SOUTHWEST AROUND 7 MPH.
MIXING HEIGHT.......7300 FT AGL.
TRANSPORT WINDS.....SOUTHWEST AROUND 7 MPH.
CWR.................1 PERCENT.
CHANCE OF THUNDER...5 PERCENT.
FORECAST DAYS 3 THROUGH 7
WEDNESDAY
MOSTLY CLEAR. 5-10% CHANCE OF ISOLATED SHOWERS/THUNDERSTORMS. LOWS IN THE LOWER 60S. HIGHS IN THE LOWER 90S.
LIGHT WINDS.
THURSDAY
CLEAR. 5-10% CHANCE OF ISOLATED SHOWERS/THUNDERSTORMS. LOWS AROUND 60. HIGHS AROUND 90. LIGHT WINDS.
FRIDAY
CLEAR. LOWS IN THE UPPER 50S. HIGHS AROUND 90. LIGHT WINDS.
SATURDAY
CLEAR. LOWS IN THE MID 50S. HIGHS IN THE LOWER 90S.
SUNDAY
MOSTLY CLEAR. LOWS IN THE UPPER 50S. HIGHS AROUND 90.
FORECASTER...KF
REQUESTED BY...ISABELLA GIACOMANGELI
TYPE OF REQUEST...WILDFIRE
.TAG 2617670.2/STO
.DELDT 07/19/26
.FORMATTERVERSION 2.0.0
.EMAIL JORDAN.TOWNSEND@USDA.GOV,ISABELLA.GIACOMANGELI@USDA.GOV
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