Alert archive / Connecticut / Flash Flood Warnings in 2021

Flash Flood Warning 27, NWS New York, NY

August 22, 2021Southeastern Connecticut Planning Region, Connecticut

NWS New York, NY issued this flash flood warning at Aug 22, 2021, 10:54 AM EDT for Southeastern Connecticut Planning Region, Connecticut. It was in force for 3 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, 10:54 AM EDT (14:54 UTC)
Expired: Aug 22, 2021, 1:30 PM EDT
In force: 3 hr
Issued by: NWS New York, NY
Area: Storm-based polygon
Flood severity: None

County Southeastern Connecticut Planning Region, CT

The radar

The Brookhaven radar (KOKX), 85 km from the middle of the area, began a volume at 14:53 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, 1:00 PM EDT	FLASH FLOOD	2 Nne Gales Ferry, CT	CORRECTS PREVIOUS FLASH FLOOD REPORT FROM NORWICH. SR-2 EAST 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, 2.9 hours before the alert went out and 85 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.

424 
WGUS51 KOKX 221454
FFWOKX
CTC011-221645-
/O.NEW.KOKX.FF.W.0027.210822T1454Z-210822T1645Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service New York NY
1054 AM EDT Sun Aug 22 2021

The National Weather Service in Upton has issued a

* Flash Flood Warning for...
  Southern New London County in southern Connecticut...

* Until 1245 PM EDT.

* At 1054 AM EDT, Doppler radar indicated an area of heavy rain 
  moving into the warned area. Between 1 and 3 inches of rain have 
  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 London, Groton, Old Saybrook, Salem, Mystic, Waterford, East 
  Lyme, Ledyard, Griswold, East Haddam, Old Lyme, Preston, 
  Voluntown, Lyme, Gales Ferry, Ledyard Center, North Lyme, 
  Montville, Essex and North Stonington.

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 4142 7243 4144 7231 4145 7231 4153 7181
      4152 7180 4149 7182 4142 7180 4141 7184
      4134 7183 4132 7186 4133 7190 4132 7189
      4129 7214 4130 7216 4127 7220 4126 7232
      4132 7235 4135 7238 4138 7238 4139 7240

FLASH FLOOD...RADAR INDICATED

$$

Fig

2 follow-up statements

969 
WGUS51 KOKX 221630
FFWOKX
CTC011-221730-
/O.EXT.KOKX.FF.W.0027.000000T0000Z-210822T1730Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service New York NY
1230 PM EDT Sun Aug 22 2021

The National Weather Service in Upton has extended the

* Flash Flood Warning for...
  Southern New London County in southern Connecticut...

* Until 130 PM EDT.

* At 1230 PM EDT, Doppler radar indicated heavy rain across the 
  warned area. Between 1 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 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 London, Groton, Old Saybrook, Salem, Mystic, Waterford, East 
  Lyme, Ledyard, Griswold, East Haddam, Old Lyme, Preston, 
  Voluntown, Lyme, Gales Ferry, Ledyard Center, North Lyme, 
  Montville, Essex and North Stonington.

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 4142 7243 4144 7231 4145 7231 4153 7181
      4152 7180 4149 7182 4142 7180 4141 7184
      4134 7183 4132 7186 4133 7190 4132 7189
      4129 7214 4130 7216 4127 7220 4126 7232
      4132 7235 4135 7238 4138 7238 4139 7240

FLASH FLOOD...RADAR INDICATED

$$

Fig

159 
WGUS71 KOKX 221725
FFSOKX

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

CTC011-221735-
/O.EXP.KOKX.FF.W.0027.000000T0000Z-210822T1730Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
New London CT-
125 PM EDT Sun Aug 22 2021

...FLASH FLOOD WARNING WILL EXPIRE AT 130 PM EDT THIS AFTERNOON FOR 
SOUTHERN NEW LONDON 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 4142 7243 4145 7231 4153 7181 4152 7180
      4149 7182 4142 7180 4141 7184 4134 7183
      4132 7186 4133 7190 4132 7189 4129 7214
      4130 7216 4127 7220 4126 7232 4132 7235
      4135 7238 4138 7238

$$

Fig

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 22, 12:23 PM EDT	Flash Flood Warning	OKX	Lower Connecticut River Valley Planning Region, Naugatuck Valley Planning Region	4 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.