National Weather Service Text Product
AFOS product AFDSTO
Dates interpreted at 00:00 UTCDisplaying AFOS PIL: AFDSTO
Product Timestamp: 2025-09-17 20:07 UTC
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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. && $$