Alert archive / Massachusetts / Flash Flood Warnings in 2026
Flash Flood Warning 13, NWS Boston/Norton, MA
NWS Boston/Norton, MA issued this flash flood warning at Sep 13, 2026, 10:59 AM EDT for Bristol County, Plymouth County, Massachusetts. It was in force for 3 hr. 2 reports came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Sep 13, 2026, 10:59 AM EDT (14:59 UTC)
- Expired
- Sep 13, 2026, 2:00 PM EDT
- In force
- 3 hr
- Issued by
- NWS Boston/Norton, MA
- Area
- Storm-based polygon
- Flood severity
- None
Counties Bristol County, MA, Plymouth County, MA
The radar
The Boston radar (KBOX), 39 km from the middle of the area, began a volume at 14:58 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Sep 13, 11:30 AM EDT | FLASH FLOOD | 1 E New Bedford, MA | In New Bedford, North Front Street was closed from Coggeshall St to the fish houses due to flooding. Relayed by amateur radio. |
| Sep 13, 11:37 AM EDT | FLASH FLOOD | 1 W Acushnet, MA | In New Bedford, Belleville Ave was flooded and impassable. Relayed by amateur radio. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Brookhaven, NY (KOKX), launched 12:00Z, 3.0 hours before the alert went out and 187 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.
- Mixed-layer CAPE
- 677 J/kg
- Mixed-layer CIN
- -4 J/kg
- Mixed-layer LCL
- 475 m above ground
- 0-6 km bulk shear
- 37 kt
- 0-1 km storm-relative helicity
- 103 m²/s²
- 0-3 km storm-relative helicity
- 115 m²/s²
- Significant tornado parameter
- 0.4
- Supercell composite
- 2.6
The text
As transmitted.
855
WGUS51 KBOX 131459
FFWBOX
MAC005-023-131800-
/O.NEW.KBOX.FF.W.0013.260913T1459Z-260913T1800Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Boston/Norton MA
1059 AM EDT Sun Sep 13 2026
The National Weather Service in Norton has issued a
* Flash Flood Warning for...
Southeastern Bristol County in southeastern Massachusetts...
South Central Plymouth County in southeastern Massachusetts...
* Until 200 PM EDT.
* At 1059 AM EDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 1 and 1.5 inches of rain
have fallen. The expected rainfall rate is 1 to 2 inches in 1 hour.
Additional rainfall amounts of 1 to 3 inches are possible in the
warned area. Flash flooding is ongoing or expected to begin
shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar indicated.
IMPACT...Flash flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other poor
drainage and low-lying areas.
* Some locations that will experience flash flooding include...
New Bedford, Fall River, Dartmouth, Marion, Wareham, Fairhaven,
Acushnet, Freetown, Mattapoisett and Rochester.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be aware of your surroundings and do not drive on flooded roads.
&&
LAT...LON 4151 7101 4177 7103 4178 7079 4177 7069
4158 7081
FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL RATE...1-2 INCHES IN 1 HOUR
$$
FT3 follow-up statements
467
WGUS71 KBOX 131543
FFSBOX
Flash Flood Statement
National Weather Service Boston/Norton MA
1143 AM EDT Sun Sep 13 2026
MAC005-023-131800-
/O.CON.KBOX.FF.W.0013.000000T0000Z-260913T1800Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Bristol MA-Plymouth MA-
1143 AM EDT Sun Sep 13 2026
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 2 PM EDT THIS
AFTERNOON FOR SOUTHEASTERN BRISTOL AND SOUTH CENTRAL PLYMOUTH
COUNTIES...
At 1143 AM EDT, local law enforcement reported thunderstorms
producing heavy rain across the warned area. Between 1 and 2 inches
of rain have fallen. The expected rainfall rate is 1 to 2 inches in 1
hour. Additional rainfall amounts of 1 to 3 inches are possible in
the warned area. Flash flooding is ongoing or expected to begin
shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Law enforcement reported.
IMPACT...Flash flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other poor
drainage and low-lying areas.
Some locations that will experience flash flooding include...
New Bedford, Fall River, Dartmouth, Marion, Wareham, Fairhaven,
Acushnet, Freetown, Mattapoisett and Rochester.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be aware of your surroundings and do not drive on flooded roads.
Please report observed flooding to local emergency services or law
enforcement and request they pass this information to the National
Weather Service when you can do so safely.
&&
LAT...LON 4177 7103 4151 7101 4158 7081 4177 7069
4178 7079
FLASH FLOOD...OBSERVED
EXPECTED RAINFALL RATE...1-2 INCHES IN 1 HOUR
$$
FT222
WGUS71 KBOX 131625
FFSBOX
Flash Flood Statement
National Weather Service Boston/Norton MA
1225 PM EDT Sun Sep 13 2026
MAC005-023-131800-
/O.CON.KBOX.FF.W.0013.000000T0000Z-260913T1800Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Bristol MA-Plymouth MA-
1225 PM EDT Sun Sep 13 2026
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 2 PM EDT THIS
AFTERNOON FOR SOUTHEASTERN BRISTOL AND SOUTH CENTRAL PLYMOUTH
COUNTIES...
At 1225 PM EDT, gauge reports indicated thunderstorms producing heavy
rain across the warned area. Between 1.5 and 2.5 inches of rain have
fallen. The expected rainfall rate is 1 to 2 inches in 1 hour.
Additional rainfall amounts of 1 to 2 inches are possible in the
warned area. Flash flooding is ongoing or expected to begin shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Gauges reported.
IMPACT...Flash flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other poor
drainage and low-lying areas.
Some locations that will experience flash flooding include...
New Bedford, Fall River, Dartmouth, Marion, Wareham, Fairhaven,
Acushnet, Freetown, Mattapoisett and Rochester.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be aware of your surroundings and do not drive on flooded roads.
Please report observed flooding to local emergency services or law
enforcement and request they pass this information to the National
Weather Service when you can do so safely.
&&
LAT...LON 4177 7103 4151 7101 4158 7081 4177 7069
4178 7079
FLASH FLOOD...GAUGE INDICATED
EXPECTED RAINFALL RATE...1-2 INCHES IN 1 HOUR
$$
FT959
WGUS71 KBOX 131753
FFSBOX
Flash Flood Statement
National Weather Service Boston/Norton MA
153 PM EDT Sun Sep 13 2026
MAC005-023-131803-
/O.EXP.KBOX.FF.W.0013.000000T0000Z-260913T1800Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Bristol MA-Plymouth MA-
153 PM EDT Sun Sep 13 2026
...FLASH FLOOD WARNING WILL EXPIRE AT 2 PM EDT THIS AFTERNOON FOR
SOUTHEASTERN BRISTOL AND SOUTH CENTRAL PLYMOUTH COUNTIES...
While the heaviest rain has come to an end, areas of additional
localized flooding and ponding are possible over the next several
hours. Please continue to heed remaining road closures.
A Flood Watch remains in effect until 600 PM EDT for portions of
southeastern Massachusetts and Rhode Island.
&&
LAT...LON 4177 7103 4151 7101 4158 7081 4177 7069
4178 7079
$$
FTThe office that day
Everything else NWS Boston/Norton, MA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 13, 10:46 AM EDT | Flash Flood Warning | BOX | Bristol | 3 hr |
| Sep 13, 2:23 PM EDT | Small Craft Advisory | BOX | 26 hr |
Nearby
Flash Flood Warnings in Massachusetts, 2026Every flash flood warning 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.