Alert archive / Massachusetts / Flash Flood Warnings in 2021
Flash Flood Warning 38, NWS Boston/Norton, MA
NWS Boston/Norton, MA issued this flash flood warning at Sep 2, 2021, 7:25 AM EDT for Hampden County, Hampshire County, Worcester County, Massachusetts; Capitol Planning Region, Northeastern Connecticut Planning Region, Connecticut. It was in force for 6 hr. 8 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 2, 2021, 7:25 AM EDT (11:25 UTC)
- Expired
- Sep 2, 2021, 1:28 PM EDT
- In force
- 6 hr
- Issued by
- NWS Boston/Norton, MA
- Area
- Storm-based polygon
- Damage threat
- Considerable
- Flood severity
- None
Counties Capitol Planning Region, CT, Northeastern Connecticut Planning Region, CT, Hampden County, MA, Hampshire County, MA, Worcester County, MA
The radar
The Boston radar (KBOX), 112 km from the middle of the area, began a volume at 11:28 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, 7:46 AM EDT | HEAVY RAIN 5.08 | Auburn, MA | |
| Sep 2, 7:55 AM EDT | FLOOD | Andover, CT | HOP RIVER OUT OF ITS BANKS IN ANDOVER, WHICH FLOODED BUNKER HILL, LONG HILL AND PARKER BRIDGE ROADS. |
| Sep 2, 8:30 AM EDT | FLOOD | 1 Ese Westfield, MA | TWITTER PHOTO OF POWERDERMILL BROOK OVERFLOWING ITS BANKS AND LEADING TO FLOODING ON GREENWOOD ST IN WESTFIELD. |
| Sep 2, 8:31 AM EDT | HEAVY RAIN 5.5 | Monson, MA | |
| Sep 2, 8:56 AM EDT | HEAVY RAIN 6 | Canton, CT | |
| Sep 2, 8:57 AM EDT | HEAVY RAIN 5.6 | Willington, CT | |
| Sep 2, 9:19 AM EDT | FLOOD | 2 Ene Plainville, CT | PHOTO OF HIGH WATER AT THE CWPM DUMPSTER SITE IN PLAINVILLE. HEIGHT OF FLOODWATERS ARE NEARLY UP TO THE BOTTOM OF A STOP SIGN. |
| Sep 2, 10:08 AM EDT | HEAVY RAIN 5.5 | Mansfield Depot, CT |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Albany, NY (KALY), launched 00:00Z, 11.4 hours before the alert went out and 133 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
- 3 J/kg
- Mixed-layer CIN
- -3 J/kg
- Mixed-layer LCL
- 525 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- -26 m²/s²
- 0-3 km storm-relative helicity
- 36 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
452
WGUS51 KBOX 021125
FFWBOX
CTC003-013-015-MAC013-015-027-021915-
/O.NEW.KBOX.FF.W.0038.210902T1125Z-210902T1915Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Boston/Norton MA
725 AM EDT Thu Sep 2 2021
The National Weather Service in Norton has issued a
* Flash Flood Warning for...
Hartford County in northern Connecticut...
Tolland County in northern Connecticut...
Windham County in northern Connecticut...
Southern Worcester County in central Massachusetts...
Hampden County in western Massachusetts...
Southwestern Hampshire County in western Massachusetts...
* Until 315 PM EDT Thursday.
* At 725 AM EDT, gauge reports indicated heavy rain falling across
the warned area. Between 3 and 7 inches of rain have fallen. Flash
flooding is ongoing or expected to begin shortly.
HAZARD...Life threatening flash flooding. Heavy rain producing
flash flooding.
SOURCE...River and rain gauges reported.
IMPACT...Life threatening flash flooding of streams, urban
areas, highways, streets and underpasses. Many rivers
and streams are still rising, and considerable poor
drainage flooding remains.
* Some locations that will experience flash flooding include...
Worcester, Springfield, Hartford, New Britain, West Hartford,
Bristol, Manchester, Chicopee, East Hartford, Enfield,
Southington, Westfield, Holyoke, Shrewsbury, Glastonbury,
Newington, Vernon, Windsor, Agawam and West Springfield.
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 4231 7300 4238 7307 4239 7307 4220 7269
4230 7260 4217 7220 4219 7190 4235 7179
4235 7164 4202 7153 4201 7180 4164 7180
4171 7224 4159 7239 4164 7263 4156 7295
4180 7302 4181 7295 4197 7289 4197 7303
FLASH FLOOD...GAUGE INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
NB2 follow-up statements
184
WGUS71 KBOX 021410
FFSBOX
Flash Flood Statement
National Weather Service Boston/Norton MA
1010 AM EDT Thu Sep 2 2021
CTC003-013-015-MAC013-015-027-021915-
/O.CON.KBOX.FF.W.0038.000000T0000Z-210902T1915Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Hartford CT-Tolland CT-Windham CT-Hampden MA-Hampshire MA-Worcester
MA-
1010 AM EDT Thu Sep 2 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 315 PM EDT THIS
AFTERNOON FOR HARTFORD, TOLLAND, WINDHAM, SOUTHERN WORCESTER,
HAMPDEN AND SOUTHWESTERN HAMPSHIRE COUNTIES...
At 1010 AM EDT, gauge reports indicated that heavy rain had fallen
across the warned area. Between 4 and 6.5 inches of rain have
fallen. Flash flooding is already occurring.
HAZARD...Life threatening flash flooding.
SOURCE...River gauges reported.
IMPACT...Life threatening flash flooding of streams and small
rivers, urban areas, highways, streets and underpasses.
Some locations that will experience flash flooding include...
Worcester, Springfield, Hartford, New Britain, West Hartford,
Bristol, Manchester, Chicopee, East Hartford, Enfield,
Southington, Westfield, Holyoke, Shrewsbury, Glastonbury,
Newington, Vernon, Windsor, Agawam and West Springfield.
Several area rivers were rising towards or had crested above
Moderate Flood Stage. This included the following rivers; the Mount
Hope River at Warrenville, the Quinnipiac River at Southington, the
Hockanum River at East Hartford, and the North Branch Park River in
Hartford. Rivers that were in minor flood included the Quinebaug
River at Quinebaug, and the Willimantic River at Coventry. There are
likely other ungaged rivers and streams that are producing minor to
moderate flooding in the warning area.
In addition, any areas of significant urban and poor drainage
flooding may take several hours or more to fully recede.
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 4231 7300 4238 7307 4239 7307 4220 7269
4230 7260 4217 7220 4219 7190 4235 7179
4235 7164 4202 7153 4201 7180 4164 7180
4171 7224 4159 7239 4164 7263 4156 7295
4180 7302 4181 7295 4197 7289 4197 7303
FLASH FLOOD...GAUGE INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
NB088
WGUS71 KBOX 021728
FFSBOX
Flash Flood Statement
National Weather Service Boston/Norton MA
128 PM EDT Thu Sep 2 2021
CTC003-013-015-MAC013-015-027-021738-
/O.CAN.KBOX.FF.W.0038.000000T0000Z-210902T1915Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Hartford CT-Tolland CT-Windham CT-Hampden MA-Hampshire MA-Worcester
MA-
128 PM EDT Thu Sep 2 2021
...FLASH FLOOD WARNING FOR HARTFORD, TOLLAND AND WINDHAM COUNTIES
HAS BEEN REPLACED WITH A FLOOD WARNING...
Across Northern Connecticut, most small rivers and streams are
coming into crest or beginning to recede. While river flooding
remains a threat through this afternoon, the threat of flash
flooding has come to an end.
LAT...LON 4203 7301 4203 7281 4200 7282 4200 7277
4203 7275 4201 7180 4164 7180 4171 7224
4159 7239 4161 7248 4165 7251 4164 7263
4156 7295 4164 7294 4164 7297 4180 7302
4181 7295 4197 7289 4197 7303
$$
RCThe 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, 12:08 AM EDT | Flash Flood Warning | BOX | Barnstable, Dukes | 8 hr |
| 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, 7:43 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 |
| Sep 2, 1:51 AM EDT | River Flood Warning | BOX | Capitol Planning Region | 26 hr |
| Sep 2, 1:51 AM EDT | River Flood Warning | BOX | Capitol Planning Region | 66 hr |
| Sep 2, 1:51 AM EDT | River Flood Warning | BOX | Capitol Planning Region | 45 hr |
| Sep 2, 8:20 AM EDT | River Flood Warning | BOX | Southeastern Connecticut Planning Region | 53 hr |
Nearby
Flash Flood Warnings in Massachusetts, 2021Flash Flood Warnings in Connecticut, 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.