Skip to contentCALCHIS
≋floodactive

Coastal Flood Warning issued September 25 at 1:53AM EDT until September 27 at 8:00PM EDT by NWS Boston/Norton MA

7.0
41.9862°N, 70.6088°W·US-MA
Started just now
NWS flood alerts data as of
Event Details
Typeflood
Severity7.0
Statusactive
Location41.9862°N, 70.6088°W (MA)
Started2026-09-25T21:00:00+00:00
Last Updated2026-09-25T08:30:50.653+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

This event's zone is the NWS warning polygon. Population and structure estimates are not computed inside NWS polygons yet, so none are shown.

Historical Comparison
2010 PLYMOUTH County, MASSACHUSETTS Flood73% match

Flood in MASSACHUSETTS, 25km from current event, $16M in recorded damage

PLYMOUTH County, MASSACHUSETTSDamage: $16.1M
2010 PLYMOUTH County, MASSACHUSETTS Flood70% match

Flood in MASSACHUSETTS, 30km from current event, $8M in recorded damage

PLYMOUTH County, MASSACHUSETTSDamage: $8.1M
2020 NORFOLK County, MASSACHUSETTS Flash Flood69% match

Flash Flood in MASSACHUSETTS, 54km from current event, $30M in recorded damage

NORFOLK County, MASSACHUSETTSDamage: $30.0M

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

View on Live Map
Related

Is this event approaching a location you care about?

Calchis tracks live federal event feeds against your own saved addresses and portfolios, and alerts you when a consequence zone reaches one.

Free includes Live map + 3 triggers + 10 bond positions. Analyst is $149/mo for 1,000-location portfolios, ep curves, predictions, parametric triggers.

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