Alert archive / Connecticut / Flash Flood Warnings in 2021

Flash Flood Warning 44, NWS New York, NY

September 2, 2021Lower Connecticut River Valley Planning Region, Naugatuck Valley Planning Region, Southeastern Connecticut Planning Region, Connecticut

NWS New York, NY issued this flash flood warning at Sep 2, 2021, 12:06 AM EDT for Lower Connecticut River Valley Planning Region, Naugatuck Valley Planning Region, Southeastern Connecticut Planning Region, Connecticut. It was in force for 5 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 2, 2021, 12:06 AM EDT (04:06 UTC)
Expired: Sep 2, 2021, 5:23 AM EDT
In force: 5 hr
Issued by: NWS New York, NY
Area: Storm-based polygon
Damage threat: Considerable
Flood severity: None

Counties Lower Connecticut River Valley Planning Region, CT, Naugatuck Valley Planning Region, CT, Southeastern Connecticut Planning Region, CT

The radar

The Brookhaven radar (KOKX), 86 km from the middle of the area, began a volume at 04:07 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, 4:30 AM EDT	FLASH FLOOD	Waterford, CT	SEVERAL ROADS FLOODED AND CLOSED IN WATERFORD INCLUDING ROUTE 85 AT THE INTERSTATE 95 OVERPASS, GARDNERS WOOD ROAD AND OLD COLCHESTER ROAD AT INTERSTATE 395.
Sep 2, 5:00 AM EDT	FLASH FLOOD	2 Sse Norwich, CT	NUMEROUS HOMES THROUGHOUT NORWICH HAD FLOODED BASEMENTS WITH POWER NEEDING TO BE TURNED OFF FOR SAFETY. THE COMFORT INN AND SUITES ON OTROBANDO AVENUE HAD TO BE EVACUATED DUE TO MORE THAN 5 FEET OF WATER IN THE BASEMENT OF THE HOTEL. THREE APARTMENTS IN MOHEGA

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 86 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: 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

Open this sounding in Storm Lab

The text

As transmitted.

733 
WGUS51 KOKX 020406
FFWOKX
CTC007-009-011-021000-
/O.NEW.KOKX.FF.W.0044.210902T0406Z-210902T1000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service New York NY
1206 AM EDT Thu Sep 2 2021

The National Weather Service in Upton has issued a

* Flash Flood Warning for...
  Middlesex County in southern Connecticut...
  Northeastern New Haven County in southern Connecticut...
  New London County in southern Connecticut...

* Until 600 AM EDT.

* At 1206 AM EDT, Doppler radar and automated rain gauges indicated 
  thunderstorms producing heavy rain across the warned area. Between 
  1.5 and 4 inches of rain have fallen. The expected rainfall rate 
  is 1 to 2 inches in 1 hour. Additional rainfall amounts of 3 to 5 
  inches are possible in the warned area. Flash flooding is ongoing 
  or expected to begin shortly.

  HAZARD...Life threatening flash flooding. Thunderstorms
           producing flash flooding.

  SOURCE...Radar and automated gauges.

  IMPACT...Life threatening flash flooding of creeks and streams,
           urban areas, highways, streets and underpasses.

* Some locations that will experience flash flooding include...
  Jewett City, Meriden, Middletown, Wallingford, Norwich, New 
  London, Guilford, Colchester, Clinton, East Hampton, Groton, Old 
  Saybrook, Durham, Salem, Chester, Mystic, Waterford, East Lyme, 
  Ledyard and North Branford.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

Be especially cautious at night when it is harder to recognize the 
dangers of flooding.

&&

LAT...LON 4161 7272 4163 7271 4165 7251 4158 7247
      4160 7234 4164 7233 4171 7224 4166 7216
      4164 7179 4142 7180 4141 7184 4134 7183
      4132 7185 4133 7190 4132 7189 4124 7252
      4142 7266 4142 7276 4158 7277

FLASH FLOOD...RADAR AND GAUGE INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
EXPECTED RAINFALL...1-2 INCHES IN 1 HOUR

$$

Goodman

1 follow-up statement

472 
WGUS71 KOKX 020923
FFSOKX

Flash Flood Statement
National Weather Service New York NY
523 AM EDT Thu Sep 2 2021

CTC007-009-011-020933-
/O.CAN.KOKX.FF.W.0044.000000T0000Z-210902T1000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Middlesex CT-New Haven CT-New London CT-
523 AM EDT Thu Sep 2 2021

...FLASH FLOOD WARNING FOR MIDDLESEX, NORTHEASTERN NEW HAVEN AND NEW 
LONDON COUNTIES HAS BEEN REPLACED WITH A FLOOD WARNING...

The heavy rain has ended but residual flooding remains from earlier 
heavy rain. Please continue to heed remaining road closures.

A Flash Flood Watch remains in effect until 1100 AM EDT for portions 
of southern Connecticut and southeast New York.

LAT...LON 4161 7272 4163 7271 4165 7251 4158 7247
      4160 7234 4164 7233 4171 7224 4166 7216
      4164 7179 4142 7180 4141 7184 4134 7183
      4132 7185 4133 7190 4132 7189 4124 7252
      4142 7266 4142 7276 4158 7277

$$

JM

The office that day

Everything else NWS New York, NY issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Sep 1, 9:25 PM EDT	Severe Thunderstorm Warning	OKX	Greater Bridgeport Planning Region	65 min
Sep 1, 10:08 PM EDT	Flash Flood Warning EmergencyCatastrophic damage threat	OKX	Greater Bridgeport Planning Region, Naugatuck Valley Planning Region	4 hr
Sep 1, 10:20 PM EDT	Severe Thunderstorm Warning	OKX	Greater Bridgeport Planning Region, Naugatuck Valley Planning Region	55 min
Sep 1, 11:11 PM EDT	Severe Thunderstorm Warning	OKX	Greater Bridgeport Planning Region, Naugatuck Valley Planning Region	64 min
Sep 2, 12:13 AM EDT	Severe Thunderstorm Warning Considerable damage threat	OKX	Lower Connecticut River Valley Planning Region, Naugatuck Valley Planning Region, Southeastern Connecticut Planning Region	92 min
Sep 2, 12:53 AM EDT	River Flood Warning	OKX	Naugatuck Valley Planning Region	5 hr
Sep 2, 1:06 AM EDT	Areal Flood Warning	OKX	Greater Bridgeport Planning Region	4 hr
Sep 2, 1:15 AM EDT	River Flood Warning	OKX	Southeastern Connecticut Planning Region	21 hr
Sep 2, 1:19 AM EDT	River Flood Warning	OKX	Southeastern Connecticut Planning Region	8 hr
Sep 2, 2:30 AM EDT	Areal Flood Warning	OKX	Greater Bridgeport Planning Region, Lower Connecticut River Valley Planning Region, Naugatuck Valley Planning Region	8 hr
Sep 2, 5:01 AM EDT	Areal Flood Warning	OKX	Greater Bridgeport Planning Region	3 hr
Sep 2, 5:23 AM EDT	Areal Flood Warning	OKX	Lower Connecticut River Valley Planning Region, Naugatuck Valley Planning Region, Southeastern Connecticut Planning Region	19 hr
Sep 2, 10:07 AM EDT	Areal Flood Warning	OKX	Greater Bridgeport Planning Region, Naugatuck Valley Planning Region	15 hr

Nearby

Flash Flood Warnings in Connecticut, 2021 Every 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.