Alert archive / Connecticut / Flash Flood Warnings in 2021
Flash Flood Warning 23, NWS Boston/Norton, MA
NWS Boston/Norton, MA issued this flash flood warning at Aug 22, 2021, 1:37 PM EDT for Capitol Planning Region, Connecticut. It was in force for 4 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
- Aug 22, 2021, 1:37 PM EDT (17:37 UTC)
- Expired
- Aug 22, 2021, 5:30 PM EDT
- In force
- 4 hr
- Issued by
- NWS Boston/Norton, MA
- Area
- Storm-based polygon
- Flood severity
- None
County Capitol Planning Region, CT
The radar
The Brookhaven radar (KOKX), 90 km from the middle of the area, began a volume at 17:41 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 |
|---|---|---|---|
| Aug 22, 3:00 PM EDT | FLOOD | 2 Ssw Manchester, CT | 22 PROSPECT ST IN MANCHESTER FLOODED WHICH RESULTED IN THE EVACUATION OF A 60 UNIT CONDO COMPLEX NEARBY. |
| Aug 22, 3:11 PM EDT | FLOOD | 1 Ne Wethersfield, CT | NORTHBOUND SIDE OF INTERSTATE 91 IN THE VICINITY OF EXIT 25 CLOSED DUE TO HIGH WATER RESULTING IN A MAJOR TRAFFIC JAM. RELAYED BY BROADCAST MEDIA, AMATEUR RADIO AND NWS SAVI TEAM MEMBERS. |
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, 5.6 hours before the alert went out and 90 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
- 36 J/kg
- Mixed-layer CIN
- -3 J/kg
- Mixed-layer LCL
- 563 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- 130 m²/s²
- 0-3 km storm-relative helicity
- 163 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
The text
As transmitted.
585
WGUS51 KBOX 221737
FFWBOX
CTC003-222130-
/O.NEW.KBOX.FF.W.0023.210822T1737Z-210822T2130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Boston/Norton MA
137 PM EDT Sun Aug 22 2021
The National Weather Service in Norton has issued a
* Flash Flood Warning for...
Central Hartford County in northern Connecticut...
* Until 530 PM EDT.
* At 137 PM EDT, Doppler radar indicated heavy rain across the
warned area. Between 0.5 and 1.5 inches of rain have fallen. The
expected rainfall rate is 1 to 2 inches in 1 hour. Additional
rainfall amounts of 2 to 4 inches are possible in the warned area.
Flash flooding is ongoing or expected to begin shortly, with sharp
rises on rivers and streams over bankfull with urban flooding
anticipated in the Greater Hartford metro area.
HAZARD...Flash flooding caused by heavy rain.
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...
Hartford, New Britain, West Hartford, Bristol, Manchester, East
Hartford, Enfield, Southington, Glastonbury, Newington, Windsor,
Wethersfield, South Windsor, Farmington, Simsbury, Bloomfield,
Berlin, Rocky Hill, Avon and Plainville.
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 4156 7290 4162 7290 4167 7296 4173 7287
4179 7284 4187 7284 4195 7276 4197 7263
4192 7252 4164 7253 4163 7271 4161 7272
4159 7275 4158 7275 4157 7280 4155 7282
4157 7283 4157 7285 4155 7285 4156 7288
FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL...1-2 INCHES IN 1 HOUR
$$
AL/KS3 follow-up statements
242
WGUS71 KBOX 221922
FFSBOX
Flash Flood Statement
National Weather Service Boston/Norton MA
322 PM EDT Sun Aug 22 2021
CTC003-222130-
/O.CON.KBOX.FF.W.0023.000000T0000Z-210822T2130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Hartford CT-
322 PM EDT Sun Aug 22 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 530 PM EDT THIS
AFTERNOON FOR CENTRAL HARTFORD COUNTY...
At 322 PM EDT, Doppler radar indicated bands of heavy rain moving
northwestward. Broadcast media webcam indicated part of the
northbound side of Interstate 91 between exits 25 and 27 in
Wethersfield is closed due to high water. In addition, the river
gage on the Hockanum River at East Hartford is experiencing sharp
rises due to runoff. Between 1.5 and 2 inches of rain have fallen.
The expected rainfall rate is 0.5 to 1 inch in 1 hour, with
additional rainfall amounts up to 2 inches are possible in the
warned area. Flash flooding is already occurring.
HAZARD...Flash flooding caused by heavy rain.
SOURCE...Radar.
IMPACT...Flash flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other poor
drainage and low-lying areas.
Some locations that will experience flash flooding include...
Hartford, New Britain, West Hartford, Bristol, Manchester, East
Hartford, Enfield, Southington, Glastonbury, Newington, Windsor,
Wethersfield, South Windsor, Farmington, Simsbury, Bloomfield,
Berlin, Rocky Hill, Avon and Plainville.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be aware of your surroundings and do not drive on flooded roads.
&&
LAT...LON 4156 7290 4162 7290 4167 7296 4173 7287
4179 7284 4187 7284 4195 7276 4197 7263
4192 7252 4164 7253 4163 7271 4161 7272
4159 7275 4158 7275 4157 7280 4155 7282
4157 7283 4157 7285 4155 7285 4156 7288
FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL...0.5-1 INCH IN 1 HOUR
$$
AL/KS573
WGUS71 KBOX 222109
FFSBOX
Flash Flood Statement
National Weather Service Boston/Norton MA
509 PM EDT Sun Aug 22 2021
CTC003-222130-
/O.CON.KBOX.FF.W.0023.000000T0000Z-210822T2130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Hartford CT-
509 PM EDT Sun Aug 22 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 530 PM EDT THIS
AFTERNOON FOR CENTRAL HARTFORD COUNTY...
At 509 PM EDT, rain is now lightening up in intensity. However
flooding impacts remain. The northbound side of Interstate 91
between exits 25 and 27 in Wethersfield was closed due to high
water. Excessive runoff has also led to sharp rises on the North
Branch of the Park River in Hartford, which is one foot below flood
stage of 8 feet. At 8 feet, flooding occurs in the parking lot of
the University of Hartford campus. The Hockanum River near East
Hartford also is rising, and is 1.5 feet below its flood stage of
9.5 feet. At 9.5 feet, flooding occurs on Burnside Ave in East
Hartford. Between 1.5 and 2 inches of rain have fallen. Flash
flooding is already occurring.
HAZARD...Flash flooding caused by heavy rain.
SOURCE...Broadcast media and amateur radio.
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...
Hartford, New Britain, West Hartford, Bristol, Manchester, East
Hartford, Enfield, Southington, Glastonbury, Newington, Windsor,
Wethersfield, South Windsor, Farmington, Simsbury, Bloomfield,
Berlin, Rocky Hill, Avon and Plainville.
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 4156 7290 4162 7290 4167 7296 4173 7287
4179 7284 4187 7284 4195 7276 4197 7263
4192 7252 4164 7253 4163 7271 4161 7272
4159 7275 4158 7275 4157 7280 4155 7282
4157 7283 4157 7285 4155 7285 4156 7288
FLASH FLOOD...OBSERVED
$$
AL311
WGUS71 KBOX 222126
FFSBOX
Flash Flood Statement
National Weather Service Boston/Norton MA
526 PM EDT Sun Aug 22 2021
CTC003-222136-
/O.EXP.KBOX.FF.W.0023.000000T0000Z-210822T2130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Hartford CT-
526 PM EDT Sun Aug 22 2021
...FLASH FLOOD WARNING WILL EXPIRE AT 530 PM EDT THIS AFTERNOON FOR
CENTRAL HARTFORD COUNTY...
The heavy rain has ended. Flooding is no longer expected to pose a
threat. Please continue to heed remaining road closures.
A Flood Watch remains in effect until 800 PM EDT Monday for portions
of northern Connecticut, Massachusetts and Rhode Island.
LAT...LON 4156 7290 4162 7290 4167 7296 4173 7287
4179 7284 4187 7284 4195 7276 4197 7263
4192 7252 4164 7253 4163 7271 4161 7272
4159 7275 4158 7275 4157 7280 4155 7282
4157 7283 4157 7285 4155 7285 4156 7288
$$
ALThe office that day
Everything else NWS Boston/Norton, MA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 22, 1:28 PM EDT | Flash Flood Warning | BOX | Capitol Planning Region, Northeastern Connecticut Planning Region | 4 hr |
| Aug 22, 1:53 PM EDT | Flash Flood Warning | BOX | Capitol Planning Region | 4 hr |
| Aug 22, 4:11 PM EDT | Areal Flood Warning | BOX | Capitol Planning Region | 4 hr |
Nearby
Flash 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.