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Flash Flood Warning issued August 3 at 7:21AM EDT until August 3 at 11:15AM EDT by NWS Gray ME

8.0

42.9907° N, 71.3764° W·US-NH

Started 2h ago

Event Details

Typeflood

Severity8.0

Statusactive

Location42.9907°N, 71.3764°W (US-NH)

Started2026-08-03T11:21:00+00:00

Last Updated2026-08-03T13:31:49.785+00:00

Sourcenoaa_ahps

Source URLapi.weather.gov

Confidence1.00

Impact Zones

Catastrophic Impact Zone

Flash flooding or major flood stage. Immediate danger to life and property.

NWS polygon

Zone estimates are based on scientific models and may differ from actual local conditions.

Impact Analysis

Note: Zone 1 uses NWS polygon geometry. Exposure for this zone is pending polygon-based computation — totals reflect outer zones only.

Population from ACS 5-Year 2022 tract sampling; structure counts from Microsoft Building Footprints or Census ACS housing data, capped by USGS NLCD 2021 developed land. Estimates for situational awareness — not for actuarial, regulatory, or underwriting use.

Historical Comparison

2010 MERRIMACK County, NEW HAMPSHIRE Flood (2010)75% match

Flood in NEW HAMPSHIRE, 7km from current event, $2M in recorded damage

MERRIMACK County, NEW HAMPSHIREDamage: $1.7M

2011 MERRIMACK County, NEW HAMPSHIRE Flood (2011)74% match

Flood in NEW HAMPSHIRE, 10km from current event, $900K in recorded damage

MERRIMACK County, NEW HAMPSHIREDamage: $900K

2008 HILLSBOROUGH County, NEW HAMPSHIRE Flash Flood (2008)72% match

Flash Flood in NEW HAMPSHIRE, 11km from current event, $750K in recorded damage

HILLSBOROUGH County, NEW HAMPSHIREDamage: $750K

Historical comparison based on peril type, geography, and severity. Past events do not predict future outcomes.

View on Live Map

US-NH flood hazard profile All US hazard profiles Scoring methodology

Zone estimates are based on scientific models and may differ from actual local conditions.