Overview
- Southern California is forecast to turn wet and gusty Saturday night into Sunday with the heaviest downpours likely during or shortly after peak trick‑or‑treating hours, and coastal flood advisories and elevated surf are already in effect.
- South Florida faces increasing rain and breezy onshore flow through Sunday and Monday, with the Weather Prediction Center issuing a Marginal Risk for flash flooding for East Coast metro areas and 1–3 inches of rain possible in spots.
- Tropical Storm Vance’s moisture is expected to push into parts of Texas this weekend and could enhance weekend rainfall there if it couples with local lifting, though timing uncertainty means totals will vary by location.
- Much of the Northeast is scheduled to be cooler but largely dry for Halloween, providing favorable trick‑or‑treat conditions, while a cold front arriving early next week could raise the chance of heavier rain and isolated severe storms Monday into Tuesday.
- Practical impacts include localized flooding and travel disruptions in heavier downpours, coastal inundation risk around high tide in affected areas, and the end of Daylight Saving Time early Sunday when clocks are set back one hour.