Alert archive / Connecticut / Flash Flood Warnings in 2012

Flash Flood Warning 28, NWS New York, NY

September 18, 20124 counties in Connecticut

NWS New York, NY issued this flash flood warning at Sep 18, 2012, 9:42 PM EDT for 4 counties in Connecticut. It was in force for 93 min. 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: Sep 18, 2012, 9:42 PM EDT (01:42 UTC)
Expired: Sep 18, 2012, 11:15 PM EDT
In force: 93 min
Issued by: NWS New York, NY
Area: Storm-based polygon
Flood severity: None

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

The radar

The Brookhaven radar (KOKX), 64 km from the middle of the area, began a volume at 01:42 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 18, 10:00 PM EDT	FLASH FLOOD	Ansonia, CT	WAKELEE AVENUE NEAR CLARKSON STREET CLOSED DUE TO FLOODING. BEAVER STREET ALSO CLOSED DUE TO FLOODING. TIME ESTIMATED BY RADAR.

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, 1.7 hours before the alert went out and 64 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: 270 J/kg
Mixed-layer CIN: -6 J/kg
Mixed-layer LCL: 629 m above ground
0-6 km bulk shear: 58 kt
0-1 km storm-relative helicity: 667 m²/s²
0-3 km storm-relative helicity: 699 m²/s²
Significant tornado parameter: 1.1
Supercell composite: 4.2

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

281 
WGUS51 KOKX 190142
FFWOKX
CTC001-007-009-011-190315-
/O.NEW.KOKX.FF.W.0028.120919T0142Z-120919T0315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE NEW YORK NY
942 PM EDT TUE SEP 18 2012

THE NATIONAL WEATHER SERVICE IN UPTON NY HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  FAIRFIELD COUNTY IN SOUTHERN CONNECTICUT...
  MIDDLESEX COUNTY IN SOUTHERN CONNECTICUT...
  NEW HAVEN COUNTY IN SOUTHERN CONNECTICUT...
  WESTERN NEW LONDON COUNTY IN SOUTHERN CONNECTICUT...

* UNTIL 1115 PM EDT...

* AT 938 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  FLASH FLOODING FROM THUNDERSTORMS ALONG A LINE EXTENDING FROM
  CROMWELL TO 17 MILES SOUTH OF BRIDGEPORT...OR ALONG A LINE
  EXTENDING FROM NEWINGTON TO STONY BROOK...MOVING NORTHEAST AT 55
  MPH.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY. MOVE TO HIGHER GROUND.

MOST FLOOD DEATHS OCCUR IN AUTOMOBILES. NEVER DRIVE YOUR VEHICLE INTO
AREAS WHERE THE WATER COVERS THE ROADWAY. FLOOD WATERS ARE USUALLY
DEEPER THAN THEY APPEAR. JUST ONE FOOT OF FLOWING WATER IS POWERFUL
ENOUGH TO SWEEP VEHICLES OFF THE ROAD. WHEN ENCOUNTERING FLOODED
ROADS MAKE THE SMART CHOICE...TURN AROUND...DONT DROWN.

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY.
RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE
PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSS
SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY
AUTOMOBILE.

&&

LAT...LON 4128 7227 4125 7238 4123 7276 4126 7277
      4124 7290 4128 7292 4114 7310 4113 7324
      4151 7329 4152 7317 4156 7316 4164 7298
      4164 7293 4156 7294 4155 7286 4163 7271
      4165 7251 4159 7244 4160 7234 4166 7231

$$

JP

1 follow-up statement

140 
WGUS71 KOKX 190244
FFSOKX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE NEW YORK NY
1044 PM EDT TUE SEP 18 2012

CTC001-007-009-011-190315-
/O.CON.KOKX.FF.W.0028.000000T0000Z-120919T0315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
NEW LONDON CT-NEW HAVEN CT-MIDDLESEX CT-FAIRFIELD CT-
1044 PM EDT TUE SEP 18 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1115 PM EDT FOR
FAIRFIELD...MIDDLESEX...NEW HAVEN AND WESTERN NEW LONDON COUNTIES...

AT 1041 PM EDT...THUNDERSTORMS PRODUCING FLASH FLOODING WAS REPORTED.
THESE STORMS WERE LOCATED ALONG A LINE EXTENDING FROM 50 MILES 
NORTHEAST OF COLCHESTER TO 36 MILES NORTHEAST OF COLCHESTER...OR 
ALONG A LINE EXTENDING FROM 19 MILES NORTH OF PUTNAM TO 10 MILES 
NORTHWEST OF PUTNAM...MOVING NORTHEAST AT 55 MPH.

A TORNADO WATCH REMAINS IN EFFECT UNTIL MIDNIGHT EDT WEDNESDAY
MORNING FOR SOUTHERN CONNECTICUT AND SOUTHEAST NEW YORK.

LAT...LON 4128 7227 4125 7238 4123 7276 4126 7277
      4124 7290 4128 7292 4113 7324 4151 7329
      4152 7317 4156 7316 4164 7298 4164 7293
      4156 7294 4155 7286 4163 7271 4165 7251
      4159 7244 4160 7234 4166 7231

$$

JP

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 18, 8:21 PM EDT	Areal Flood Advisory	OKX	Greater Bridgeport Planning Region, Naugatuck Valley Planning Region	54 min
Sep 18, 8:29 PM EDT	Severe Thunderstorm Warning	OKX	Greater Bridgeport Planning Region, Naugatuck Valley Planning Region	46 min
Sep 18, 9:04 PM EDT	Areal Flood Advisory	OKX	Lower Connecticut River Valley Planning Region, Naugatuck Valley Planning Region	86 min
Sep 18, 9:09 PM EDT	Severe Thunderstorm Warning	OKX	Greater Bridgeport Planning Region, Lower Connecticut River Valley Planning Region, Naugatuck Valley Planning Region	51 min
Sep 18, 9:31 PM EDT	Areal Flood Advisory	OKX	Greater Bridgeport Planning Region, Naugatuck Valley Planning Region	59 min
Sep 18, 9:58 PM EDT	Severe Thunderstorm Warning	OKX	Lower Connecticut River Valley Planning Region, Naugatuck Valley Planning Region	62 min
Sep 18, 10:45 PM EDT	Severe Thunderstorm Warning	OKX	Lower Connecticut River Valley Planning Region, Southeastern Connecticut Planning Region	60 min
Sep 18, 11:21 PM EDT	Areal Flood Advisory	OKX	Lower Connecticut River Valley Planning Region, Southeastern Connecticut Planning Region	54 min
Sep 18, 11:45 PM EDT	Special Weather Statement	OKX		45 min
Sep 19, 12:18 AM EDT	Areal Flood Advisory	OKX	Southeastern Connecticut Planning Region	117 min
Sep 19, 12:40 AM EDT	Special Weather Statement	OKX		65 min

Nearby

Flash Flood Warnings in Connecticut, 2012 Every flash flood warning in 2012

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.