Overview
- Tuesday marked the autumnal equinox and the start of astronomical fall, and much of the East Coast shifted to cool, breezy, and often wet weather as onshore northeast winds strengthened.
- Meteorologists are closely watching a developing offshore low that models place near the coast late Friday into the weekend and that could produce damaging gusts and coastal impacts from the Mid‑Atlantic to New England depending on its precise track.
- Local officials and forecasters have highlighted risks of coastal erosion and tidal flooding and have issued marine alerts and Weather Alert levels for parts of New England for Friday through Sunday.
- A separate hydrologic threat exists inland and in the mountains: the National Weather Service has a Flood Watch for the San Juan Mountains with 1–3 inches of rain possible and localized flash‑flood concerns.
- Other regional contrasts include a short‑lived warmup for the Bay Area and above‑average warmth with isolated storms across parts of the Plains and Colorado, and forecasters say forecasts and watches will be refined in coming model runs so residents should monitor local updates.