Alert archive / Connecticut / Flash Flood Warnings in 2021

Flash Flood Warning 28, NWS New York, NY

August 22, 2021Lower Connecticut River Valley Planning Region, Naugatuck Valley Planning Region, Connecticut

NWS New York, NY issued this flash flood warning at Aug 22, 2021, 12:23 PM EDT for Lower Connecticut River Valley Planning Region, Naugatuck Valley Planning Region, Connecticut. It was in force for 4 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: Aug 22, 2021, 12:23 PM EDT (16:23 UTC)
Expired: Aug 22, 2021, 4:15 PM EDT
In force: 4 hr
Issued by: NWS New York, NY
Area: Storm-based polygon
Flood severity: None

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

The radar

The Brookhaven radar (KOKX), 50 km from the middle of the area, began a volume at 16:26 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, 1:50 PM EDT	FLASH FLOOD	Wallingford, CT	I-91 NORTH LANES CLOSED DUE TO FLOODING.

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, 4.4 hours before the alert went out and 50 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: 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

Open this sounding in Storm Lab

The text

As transmitted.

493 
WGUS51 KOKX 221623
FFWOKX
CTC007-009-222015-
/O.NEW.KOKX.FF.W.0028.210822T1623Z-210822T2015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service New York NY
1223 PM EDT Sun Aug 22 2021

The National Weather Service in Upton has issued a

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

* Until 415 PM EDT.

* At 1223 PM EDT, Doppler radar indicated heavy rain moving into the 
  warned area. Between 0.5 and 1 inch of rain has fallen. Additional 
  rainfall amounts of 1 to 2 inches are possible in the warned area. 
  Flash flooding is expected to begin shortly.

  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...
  New Haven, Milford, Middletown, Wallingford, Shelton, Naugatuck, 
  Guilford, Southbury, Clinton, Old Saybrook, Durham, Chester, 
  Newtown, Hamden, Stratford, Cheshire, Branford, North Haven, 
  Monroe and Seymour.

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 4144 7326 4153 7233 4143 7232 4142 7243
      4138 7236 4136 7238 4126 7232 4124 7254
      4126 7258 4123 7276 4125 7278 4123 7289
      4125 7291 4119 7301 4120 7305 4117 7310
      4123 7311 4130 7307 4141 7319

FLASH FLOOD...RADAR INDICATED

$$

Fig

2 follow-up statements

420 
WGUS71 KOKX 221920
FFSOKX

Flash Flood Statement
National Weather Service New York NY
320 PM EDT Sun Aug 22 2021

CTC007-221930-
/O.CAN.KOKX.FF.W.0028.000000T0000Z-210822T2015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Middlesex CT-
320 PM EDT Sun Aug 22 2021

...FLASH FLOOD WARNING IS CANCELLED FOR MIDDLESEX COUNTY...

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 southern Connecticut, northeast New Jersey and southeast New York.

LAT...LON 4144 7326 4149 7274 4142 7275 4143 7265
      4139 7261 4133 7261 4126 7255 4127 7251
      4124 7252 4126 7258 4123 7276 4125 7291
      4119 7301 4120 7305 4117 7310 4123 7311
      4130 7307 4141 7319

$$

CTC009-222015-
/O.CON.KOKX.FF.W.0028.000000T0000Z-210822T2015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
New Haven CT-
320 PM EDT Sun Aug 22 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 415 PM EDT THIS 
AFTERNOON FOR NEW HAVEN COUNTY...

At 320 PM EDT, Doppler radar indicated heavy rain across the warned 
area. Between 1 and 2 inches of rain has 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 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...
  New Haven, Milford, Wallingford, Shelton, Naugatuck, Guilford, 
  Southbury, Clinton, Newtown, Hamden, Stratford, Cheshire, 
  Branford, North Haven, Monroe, Seymour, North Branford, Orange, 
  Derby and Prospect.

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 4144 7326 4149 7274 4142 7275 4143 7265
      4139 7261 4133 7261 4126 7255 4127 7251
      4124 7252 4126 7258 4123 7276 4125 7291
      4119 7301 4120 7305 4117 7310 4123 7311
      4130 7307 4141 7319

FLASH FLOOD...RADAR INDICATED

$$

Fig

615 
WGUS71 KOKX 222011
FFSOKX

Flash Flood Statement
National Weather Service New York NY
411 PM EDT Sun Aug 22 2021

CTC009-222021-
/O.EXP.KOKX.FF.W.0028.000000T0000Z-210822T2015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
New Haven CT-
411 PM EDT Sun Aug 22 2021

...FLASH FLOOD WARNING WILL EXPIRE AT 415 PM EDT THIS AFTERNOON FOR 
NEW HAVEN 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 southern Connecticut, northeast New Jersey and southeast New York.

LAT...LON 4144 7326 4149 7274 4142 7275 4143 7265
      4139 7261 4133 7261 4126 7255 4127 7251
      4124 7252 4126 7258 4123 7276 4125 7291
      4119 7301 4120 7305 4117 7310 4123 7311
      4130 7307 4141 7319

$$

Fig

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 22, 10:54 AM EDT	Flash Flood Warning	OKX	Southeastern Connecticut Planning Region	3 hr
Aug 22, 4:32 PM EDT	Coastal Flood Statement	OKX	Greater Bridgeport Planning Region, Naugatuck Valley Planning Region	10 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.