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Heavy Rain and Flash‑Flood Risk Forecast for Southern New Hampshire

Moist, slow-moving storms could produce repeated downpours that trigger rapid street and poor-drainage flooding.

Overview

  • Showers will begin Tuesday with the main threat arriving late Tuesday night into Wednesday and lingering into Thursday as heavier, potentially training bands move through.
  • Forecasters say the greatest flood exposure is in the southern half of the state but impacts will be highly local so neighboring towns may see very different conditions.
  • Stronger storms could produce brief torrential rain, reduced visibility, and ponding on roads that can lead to flash flooding in low-lying and poor-drainage areas.
  • Coverage differs on overall severity with one outlet calling the statewide flash-flood threat low while others warn of isolated dangerous downpours, and officials urge people to monitor NWS and local alerts.
  • This event follows a pattern of slow-moving, moisture-rich systems across the Northeast this month and models show drier, more comfortable weather returning by the weekend and early August.