Knights Ferry, California Weather Forecast Discussion

411
FXUS66 KSTO 172007
AFDSTO
Area Forecast Discussion
National Weather Service Sacramento CA
107 PM PDT Wed Sep 17 2025
For additional details on weather and expected impacts over the
next 7 days, please visit weather.gov/sto/briefing.
.DISCUSSION...
.SYNOPSIS...
Remnants of tropical system Mario will begin impacting the area
later tomorrow. The system will bring a chance of rain to the
entire area Thursday night through early Saturday. There will be a
risk of a few thunderstorms with heavy rain mainly in the Sierra
during this time. Temperatures will be much cooler through the
weekend. Another system will approach the area next week around
Tuesday brining another chance of precipitation.
&&
.KEY MESSAGES...
* THURSDAY - SATURDAY:
- Remnants of tropical system Mario will begin impacting the area
   late Thursday as it moves from north to south.
- There will be a brief period of fire weather concerns Thursday
   evening as a few thunderstorms may be dry but the atmosphere is
   expected to moisten up quickly overall decreasing fire weather
   threats.
- There will also be a threat of isolated areas of heavy rain in
   the Sierra Thursday night through Saturday morning. Rainfall
   amounts of around an inch will be possible with locally higher
   amounts. Valley amounts shouldn`t be on the heavy side but an
   isolated thunderstorm or two will be possible in the valley
   also. Despite this system being pretty close, confidence is
   still fairly low on the details so check an eye out for
   updates.
* TUESDAY
- Low confidence (20-30%) of another weather system moving across
   the area next week. Right now best chance of that is Tuesday
   but confidence is fairly low so tune in for updates on this as
   well.
.CHANGES FROM PREVIOUS FORECAST...
- Uptick in amount of rain expected, with biggest changes in the
   Sierra.
&&
.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.
&&
$$

NWS STO Office Area Forecast Discussion