Alert archive / Massachusetts / Flash Flood Warnings in 2021
Flash Flood Warning 34, NWS Boston/Norton, MA
NWS Boston/Norton, MA issued this flash flood warning at Sep 2, 2021, 12:08 AM EDT for Barnstable County, Dukes County, Massachusetts. It was in force for 8 hr. 1 report 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 2, 2021, 12:08 AM EDT (04:08 UTC)
- Expired
- Sep 2, 2021, 8:00 AM EDT
- In force
- 8 hr
- Issued by
- NWS Boston/Norton, MA
- Area
- Storm-based polygon
- Flood severity
- None
Counties Barnstable County, MA, Dukes County, MA
The radar
The Boston radar (KBOX), 54 km from the middle of the area, began a volume at 04:08 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 2, 1:55 AM EDT | FLOOD | Bourne, MA | ROTARY FLOODED WITH 2 CARS STUCK IN FLOOD WATERS. |
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 00:00Z, 4.1 hours before the alert went out and 203 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
- 123 J/kg
- Mixed-layer CIN
- -47 J/kg
- Mixed-layer LCL
- 512 m above ground
- 0-6 km bulk shear
- 53 kt
- 0-1 km storm-relative helicity
- 279 m²/s²
- 0-3 km storm-relative helicity
- 456 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.2
The text
As transmitted.
453
WGUS51 KBOX 020408
FFWBOX
MAC001-007-021200-
/O.NEW.KBOX.FF.W.0034.210902T0408Z-210902T1200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Boston/Norton MA
1208 AM EDT Thu Sep 2 2021
The National Weather Service in Norton has issued a
* Flash Flood Warning for...
Barnstable County in southeastern Massachusetts...
Dukes County in southeastern Massachusetts...
* Until 800 AM EDT Thursday.
* At 1208 AM EDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 2 and 3 inches of rain
have fallen. 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...Radar.
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...
Barnstable, Falmouth, Brewster, Marion, Oak Bluffs, Edgartown,
Tisbury, Aquinnah, Yarmouth, Wareham, Sandwich, Bourne, Dennis,
Mashpee, West Tisbury, Chilmark, Gosnold and Hyannis.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 4140 7097 4152 7072 4159 7065 4171 7073
4167 7064 4171 7071 4171 7072 4173 7068
4171 7065 4175 7062 4175 7063 4180 7053
4175 7012 4122 7051
FLASH FLOOD...RADAR INDICATED
$$
HF3 follow-up statements
911
WGUS71 KBOX 020525
FFSBOX
Flash Flood Statement
National Weather Service Boston/Norton MA
125 AM EDT Thu Sep 2 2021
MAC001-007-021200-
/O.CON.KBOX.FF.W.0034.000000T0000Z-210902T1200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Barnstable MA-Dukes MA-
125 AM EDT Thu Sep 2 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 8 AM EDT THIS MORNING
FOR BARNSTABLE AND DUKES COUNTIES...
At 125 AM EDT, Doppler radar indicated thunderstorms producing heavy
rain across the warned area. Between 2 and 4 inches of rain have
fallen. Additional rainfall amounts of 1 to 3 inches are possible in
the warned area. Flash flooding is ongoing.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar.
IMPACT...Flash flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other poor
drainage and low-lying areas.
Some locations that will experience flash flooding include...
Barnstable, Falmouth, Brewster, Marion, Oak Bluffs, Edgartown,
Tisbury, Aquinnah, Yarmouth, Wareham, Sandwich, Bourne, Dennis,
Mashpee, West Tisbury, Chilmark, Gosnold and Hyannis.
At 110 AM, Multiple cars were stuck in flood waters on Main street
at Davis straights.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
&&
LAT...LON 4140 7097 4152 7072 4159 7065 4171 7073
4167 7064 4171 7071 4171 7072 4173 7068
4171 7065 4175 7062 4175 7063 4180 7053
4175 7012 4122 7051
FLASH FLOOD...RADAR INDICATED
$$
Frank273
WGUS71 KBOX 020537
FFSBOX
Flash Flood Statement
National Weather Service Boston/Norton MA
137 AM EDT Thu Sep 2 2021
MAC001-007-021200-
/O.CON.KBOX.FF.W.0034.000000T0000Z-210902T1200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Barnstable MA-Dukes MA-
137 AM EDT Thu Sep 2 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 8 AM EDT THIS MORNING
FOR BARNSTABLE AND DUKES COUNTIES...
At 137 AM EDT, Trained weather spotters reported thunderstorms
producing heavy rain across the warned area. Between 2 and 4 inches
of rain have fallen. 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...Trained spotters 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...
Barnstable, Falmouth, Brewster, Marion, Oak Bluffs, Edgartown,
Tisbury, Aquinnah, Yarmouth, Wareham, Sandwich, Bourne, Dennis,
Mashpee, West Tisbury, Chilmark, Gosnold and Hyannis.
At 1218 AM in New Bedford...West Rodney Boulevard from 160 West
Rodney Boulevard to Aquidneck street is closed due to flooding with
water going across the road like a river. Cove Road closed from
Stapleton to County Street. A few flooded basements have also been
reported in New Bedford.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
&&
LAT...LON 4140 7097 4152 7072 4159 7065 4171 7073
4167 7064 4171 7071 4171 7072 4173 7068
4171 7065 4175 7062 4175 7063 4180 7053
4175 7012 4122 7051
FLASH FLOOD...OBSERVED
$$
Frank416
WGUS71 KBOX 020847
FFSBOX
Flash Flood Statement
National Weather Service Boston/Norton MA
447 AM EDT Thu Sep 2 2021
MAC001-007-021200-
/O.CON.KBOX.FF.W.0034.000000T0000Z-210902T1200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Barnstable MA-Dukes MA-
447 AM EDT Thu Sep 2 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 8 AM EDT THIS MORNING
FOR BARNSTABLE AND DUKES COUNTIES...
At 447 AM EDT, A cluster of thunderstorms produced flash flooding
earlier this morning across the Falmouth to Hyannis corridor.
Another cluster of very heavy rainfall will move int the region
shortly. This will result in more flash flooding between 5 and 730
am this morning. Between 2.5 and 4.5 inches of rain have fallen.
Additional rainfall amounts of 1 to 3 inches are possible in the
warned area. Flash flooding is already occurring.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Trained spotters reported.
IMPACT...Flash flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other poor
drainage and low-lying areas.
Some locations that will experience flash flooding include...
Barnstable, Falmouth, Brewster, Marion, Oak Bluffs, Edgartown,
Tisbury, Aquinnah, Yarmouth, Wareham, Sandwich, Bourne, Dennis,
Mashpee, West Tisbury, Chilmark, Gosnold and Hyannis.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 4140 7097 4152 7072 4159 7065 4171 7073
4167 7064 4171 7071 4171 7072 4173 7068
4171 7065 4175 7062 4175 7063 4180 7053
4175 7012 4122 7051
FLASH FLOOD...OBSERVED
$$
FrankThe office that day
Everything else NWS Boston/Norton, MA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 1, 9:13 PM EDT | Flash Flood Warning | BOX | Hampden | 10 hr |
| Sep 1, 9:24 PM EDT | Special Marine Warning | BOX | 66 min | |
| Sep 1, 9:37 PM EDT | Flash Flood Warning | BOX | Worcester | 10 hr |
| Sep 1, 10:01 PM EDT | Flash Flood Warning | BOX | Essex, Middlesex, Norfolk, Suffolk | 8 hr |
| Sep 1, 10:32 PM EDT | Flash Flood Warning | BOX | Bristol, Norfolk, Plymouth | 10 hr |
| Sep 1, 10:45 PM EDT | Special Marine Warning | BOX | 45 min | |
| Sep 1, 10:57 PM EDT | Flash Flood Warning | BOX | Franklin, Hampshire, Middlesex, Worcester | 8 hr |
| Sep 1, 11:02 PM EDT | Flash Flood Warning | BOX | Essex, Middlesex | 8 hr |
| Sep 1, 11:21 PM EDT | Tornado Warning | BOX | Barnstable, Bristol, Dukes, Plymouth | 54 min |
| Sep 1, 11:24 PM EDT | Special Marine Warning | BOX | 66 min | |
| Sep 1, 11:32 PM EDT | Special Marine Warning | BOX | 58 min | |
| Sep 1, 11:32 PM EDT | Special Marine Warning | BOX | 58 min | |
| Sep 1, 11:56 PM EDT | Tornado Warning | BOX | Barnstable, Dukes | 49 min |
| Sep 2, 12:20 AM EDT | Special Marine Warning | BOX | 55 min | |
| Sep 2, 12:22 AM EDT | Tornado Warning | BOX | Dukes | 53 min |
| Sep 2, 12:25 AM EDT | Special Marine Warning | BOX | 65 min | |
| Sep 2, 12:45 AM EDT | Tornado Warning | BOX | Barnstable, Dukes | 60 min |
| Sep 2, 1:07 AM EDT | Special Marine Warning | BOX | 83 min | |
| Sep 2, 1:15 AM EDT | Tornado Warning | BOX | Dukes | 28 min |
| Sep 2, 1:51 AM EDT | River Flood Warning | BOX | Worcester | 31 hr |
| Sep 2, 1:56 AM EDT | Tornado Warning | BOX | Barnstable | 26 min |
| Sep 2, 2:34 AM EDT | Flash Flood Warning | BOX | Bristol, Plymouth | 6 hr |
| Sep 2, 3:42 AM EDT | River Flood Warning | BOX | Norfolk, Suffolk | 11 hr |
| Sep 2, 5:14 AM EDT | Special Marine Warning | BOX | 46 min | |
| Sep 2, 5:26 AM EDT | Flash Flood Warning | BOX | Barnstable, Bristol, Dukes, Plymouth | 3 hr |
| Sep 2, 5:30 AM EDT | River Flood Warning | BOX | Middlesex | 22 hr |
| Sep 2, 5:49 AM EDT | Special Marine Warning | BOX | 42 min | |
| Sep 2, 6:02 AM EDT | Flash Flood Warning | BOX | Essex, Middlesex, Norfolk, Suffolk | 3 hr |
| Sep 2, 6:14 AM EDT | Special Marine Warning | BOX | 25 min | |
| Sep 2, 6:50 AM EDT | Areal Flood Warning | BOX | Franklin, Hampden, Hampshire, Middlesex, Worcester | 6 hr |
| Sep 2, 7:04 AM EDT | Areal Flood Warning | BOX | Bristol, Essex, Middlesex, Norfolk, Plymouth, Suffolk and 1 more | 11 hr |
| Sep 2, 7:25 AM EDT | Flash Flood Warning | BOX | Hampden, Hampshire, Worcester | 6 hr |
| Sep 2, 7:43 AM EDT | Areal Flood Warning | BOX | Bristol, Norfolk, Plymouth, Worcester | 6 hr |
| Sep 2, 7:54 AM EDT | Areal Flood Warning | BOX | Barnstable, Dukes, Plymouth | 6 hr |
| Sep 2, 8:14 AM EDT | River Flood Warning | BOX | Hampden, Hampshire | 13 hr |
| Sep 2, 8:20 AM EDT | River Flood Warning | BOX | Worcester | 32 hr |
| Sep 2, 8:20 AM EDT | River Flood Warning | BOX | Middlesex, Worcester | 60 hr |
| Sep 2, 9:25 AM EDT | River Flood Warning | BOX | Bristol, Plymouth | 64 hr |
| Sep 2, 10:40 AM EDT | Small Craft Advisory | BOX | 17 hr | |
| Sep 2, 12:51 PM EDT | Areal Flood Warning | BOX | Franklin, Hampden, Hampshire, Middlesex, Norfolk, Worcester | 6 hr |
| Sep 2, 1:28 PM EDT | Areal Flood Warning | BOX | Hampden | 6 hr |
| Sep 2, 1:42 PM EDT | Areal Flood Warning | BOX | Bristol, Norfolk, Plymouth, Worcester | 6 hr |
| Sep 2, 5:59 PM EDT | River Flood Warning | BOX | Essex, Middlesex | 25 hr |
Nearby
Flash Flood Warnings in Massachusetts, 2021Every flash flood warning in 2021
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.