Overview
- Late Wednesday alerts flagged patchy black ice for several upstate New York counties, with an initial window through about 12:15 a.m. Thursday.
- An updated 9:41 p.m. advisory extended the black ice risk to 13 Massachusetts counties through 9 a.m. Thursday.
- A 4:59 a.m. Thursday notice added patchy freezing drizzle and fog for parts of eastern New York through 9:15 a.m., with higher elevations most susceptible.
- The weather service cautions that falling temperatures can refreeze leftover wetness into hard‑to‑see ice on untreated roads, bridges, overpasses, sidewalks and parking lots.
- Drivers and pedestrians are urged to slow down and expect surfaces that look wet to be slick, with conditions improving by midmorning as temperatures rise.