Manchester, New Hampshire – A single rumble of thunder today is a clear signal to move indoors immediately, as lightning can strike within 10 miles of any storm across New Hampshire during the active spring and summer season.
According to the National Weather Service, lightning often reaches far beyond rainfall, striking areas where skies may still appear partly clear. Across southern and central New Hampshire, seasonal storm patterns increase the risk of sudden cloud-to-ground lightning, especially during the afternoon and early evening hours.
In Manchester, open areas like Arms Park, Livingston Park, and routes along I-293 and I-93 leave people exposed when storms develop nearby. In Concord, areas near the State House, Memorial Field, and stretches along I-89 can quickly become dangerous as storms move through the Merrimack Valley. Nashua faces similar risks along Mine Falls Park and the Everett Turnpike, where outdoor activity and flat terrain increase exposure.
Lightning kills around 20 people annually in the United States, with many more suffering lasting injuries such as neurological damage, memory loss, and cardiac complications. Many incidents occur during hiking, sports, or outdoor work when thunder is ignored or storms seem distant.
If you hear thunder, you are already within striking distance. Move indoors immediately into a fully enclosed building or a hard-topped vehicle. Avoid open fields, hilltops, and water, and wait at least 30 minutes after the last thunder before returning outside.
Storm chances will continue across New Hampshire through the season, with additional lightning alerts possible as conditions evolve.
