909
FXUS66 KSTO 162051
AFDSTO
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SACRAMENTO CA
151 PM PDT TUE SEP 16 2025
FOR ADDITIONAL DETAILS ON WEATHER AND EXPECTED IMPACTS OVER THE
NEXT 7 DAYS, PLEASE VISIT WEATHER.GOV/STO/BRIEFING.
DISCUSSION
SYNOPSIS
ANOTHER DRY AND WARM DAY FOR WEDNESDAY WITH MODERATE HEAT RISK AND
TEMPERATURES APPROACHING 100 DEGREES. THE HEAT IS SHORT LIVED AS
CLOUDS START MOVING IN AHEAD OF REMNANTS OF TROPICAL SYSTEM MARIO
ARRIVE LATER THURSDAY. SCATTERED SHOWERS AND THUNDERSTORMS WITH
MINIMAL IMPACT ARE THEN EXPECTED MAINLY THURSDAY NIGHT THROUGH
SATURDAY FROM THAT WEATHER SYSTEM.
KEY MESSAGES
* WEDNESDAY:
- RIDGING ALOFT BRINGS DRY CONDITIONS AND ABOVE NORMAL
TEMPERATURES AND AREAS OF MODERATE HEAT RISK.
* THURSDAY - SATURDAY:
- MOISTURE FROM TROPICAL SYSTEM MARIO STILL EXPECTED TO MOVE INTO
AREA BRINGING CLOUDS AND CHANCE OF MOISTURE TO ALL AREAS. NO
STRONG FORCING WITH THE MOISTURE SO LIKELY MOST ACTIVITY IN
HIGHER TERRAIN BUT ENOUGH MMOISTURE FOR LIGHT SHOWERS OR EVEN
A THUNDERSTORM IN THE VALLEY. MAIN TIME PERIOD LOOKS TO BE
THURSDAY NIGHT THROUGH SATURDAY.
- ELEVATED FIRE CONCERNS ARE TRENDING DOWN BUT WILL BE HIGHEST
THURSDAY NIGHT INTO FRIDAY BEFORE MOISTURE DEEPENS AND
HUMIDITIES INCREASE.
CHANGES FROM PREVIOUS FORECAST
- NO MAJOR CHANGES EXCEPT TO DECREASE OVERALL EXTENT OF
THUNDERSTORMS CHANCES.
AVIATION
VFR CONDITIONS AND CLEAR SKIES EXPECTED AT INTERIOR NORTHERN
CALIFORNIA TAF SITES NEXT 24 HOURS. SURFACE WINDS GENERALLY LESS
THAN 12 KTS.
STO WATCHES/WARNINGS/ADVISORIES
NONE.
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