Flash Flood in Hillsborough County, New Hampshire

Flash Flood August 13, 2025 · Hillsborough County, New Hampshire

Where the report was made, with tornadoes recorded within 15 miles over the years.

What the National Weather Service wrote

Very heavy rainfall associated with a severe thunderstorm dropped 2+ inches of rain in under an hour across the Nashua City area. The rainfall rates caused urban flooding with manhole covers popping off and flooding of Amherst Street in Nashua.

The wider storm

The region was experiencing well above normal temperatures, with high temperatures reaching the low to mid-90s. This created a very warm, humid, and unstable atmosphere. A pre-frontal surface trough moved into NH on the afternoon of August 13th, triggering numerous thunderstorms, a few of the storms became severe in nature. In addition, very heavy rain fell in Nashua area, causing some minor urban flooding.

Began near Pine Hill (42.7700, -71.4700).

Source: NOAA Storm Events Database, event 1292525. Narratives are written by the National Weather Service forecast office that issued the report.

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