Alert archive / Massachusetts / Flood Watches in 2026

Flood Watch 5, NWS Boston/Norton, MA

September 26, 202610 counties in Massachusetts; 5 counties in Rhode Island

NWS Boston/Norton, MA issued this flood watch at Sep 26, 2026, 12:18 PM EDT for 10 counties in Massachusetts; 5 counties in Rhode Island. It was in force for 50 hr.

The area

The counties it named.

The facts

Issued: Sep 26, 2026, 12:18 PM EDT (16:18 UTC)
Expired: Sep 28, 2026, 1:52 PM EDT
In force: 50 hr
Issued by: NWS Boston/Norton, MA
Flood severity: None

Counties Barnstable County, MA, Bristol County, MA, Dukes County, MA, Essex County, MA, Middlesex County, MA, Nantucket County, MA, Norfolk County, MA, Plymouth County, MA, Suffolk County, MA, Worcester County, MA, Bristol County, RI, Kent County, RI, Newport County, RI, Providence County, RI, Washington County, RI

The radar

The Boston radar (KBOX), 9 km from the middle of the area, began a volume at 16:20 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 4.3 hours before the alert went out and 185 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 1 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 456 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: 393 m²/s²
0-3 km storm-relative helicity: 719 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.1

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flood watch went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Boston/Norton, MA wrote its last area forecast discussion before this flood watch went out at Sep 26, 8:04 AM EDT, 4 hours 14 minutes earlier.

Area forecast discussion, Sep 26, 8:04 AM EDT, 4 hours 14 minutes before

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In the hours before

Local storm report, Sep 26, 7:45 AM EDT, 4 hours 33 minutes before

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Local storm report, Sep 26, 8:25 AM EDT, 3 hours 53 minutes before

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Local storm report, Sep 26, 10:29 AM EDT, 1 hour 49 minutes before

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Local storm report, Sep 26, 11:37 AM EDT, 41 minutes before

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The office that day

Everything else NWS Boston/Norton, MA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Sep 26, 3:49 PM EDT	Flash Flood Warning	BOX	Bristol, Plymouth	3 hr

Nearby

Flood Watches in Massachusetts, 2026 Flood Watches in Rhode Island, 2026 Every flood watch in 2026

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.