Heavy Rain and Storms Expected Across New Hampshire Starting Tuesday

New Hampshire's river valleys and low-lying terrain make the state particularly vulnerable to flash flooding when heavy rainfall coincides with saturated ground conditions. The state has faced repeated summer flood events in recent years, and weather agencies routinely issue precautionary flood watches when storm systems are anticipated to bring significant rainfall alongside elevated heat and humidity. A flood watch differs from a flood warning in that it signals favorable conditions for flooding rather than an ongoing or imminent event, giving residents and emergency managers time to prepare. Summer convective storms in the northeastern United States can develop quickly when warm, moist air masses collide with cooler frontal systems, a pattern forecasters have identified in the current outlook.