Overview
- The Storm Prediction Center upgraded parts of northern New York and northern New England to an Enhanced Risk on Tuesday and issued Mesoscale Discussion 1616 saying the environment is conditionally favorable for organized clusters and supercells.
- National Weather Service offices issued severe thunderstorm watches and local warnings for northern New Hampshire counties that run into the early-morning hours on Wednesday.
- Widespread smoke from Canadian wildfires produced hazy skies and cooled surface temperatures into the mid‑ to upper‑80s, a factor forecasters say may suppress some storm intensity but will not remove severe threats where storms tap warmer air.
- Forecasters list the main hazards as damaging straight‑line winds up to roughly 70–75 mph, large hail, torrential downpours with localized flooding, and a low but non‑zero chance of isolated EF‑2 tornadoes, with the overnight timing heightening risk to people who may be asleep.
- Outside New England, rain chances are falling in the Southeast before a return of hot, humid weather with triple‑digit heat indices later this week, while Montana faces a multi‑day surge of monsoonal moisture that could produce daily heavy rain and localized flash flooding.