Alert archive / Connecticut / Flash Flood Warnings in 2011

Flash Flood Warning 24, NWS New York, NY

August 15, 2011Greater Bridgeport Planning Region, Naugatuck Valley Planning Region, Connecticut

NWS New York, NY issued this flash flood warning at Aug 15, 2011, 1:04 AM EDT for Greater Bridgeport Planning Region, Naugatuck Valley Planning Region, Connecticut. It was in force for 62 min. 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 15, 2011, 1:04 AM EDT (05:04 UTC)
Expired
Aug 15, 2011, 2:06 AM EDT
In force
62 min
Issued by
NWS New York, NY
Area
Storm-based polygon
Flood severity
None

Counties Greater Bridgeport Planning Region, CT, Naugatuck Valley Planning Region, CT

The radar

The Brookhaven radar (KOKX), 78 km from the middle of the area, began a volume at 05:05 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

TimeReportWhereRemark
Aug 15, 1:50 AM EDTFLASH FLOODNaugatuck, CTFLOODING.WATER COVERING ROAD ON ROUTE 8 AT EXIT 28 UNION STREET.
Aug 15, 1:50 AM EDTFLASH FLOODSeymour, CTFLOODING...WATER COVERING THE ROAD ON ROUTE 8.

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, 5.1 hours before the alert went out and 78 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-pSkew-T log-p diagram, Brookhaven, NY at 00:00Z on 2011-08-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 117 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Brookhaven, NY at 00:00Z on 2011-08-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 73 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
117 J/kg
Mixed-layer CIN
-31 J/kg
Mixed-layer LCL
667 m above ground
0-6 km bulk shear
16 kt
0-1 km storm-relative helicity
73 m²/s²
0-3 km storm-relative helicity
169 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

Open this sounding in Storm Lab

The text

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

869 
WGUS51 KOKX 150504
FFWOKX
CTC001-009-150630-
/O.NEW.KOKX.FF.W.0024.110815T0504Z-110815T0630Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE NEW YORK NY
104 AM EDT MON AUG 15 2011

THE NATIONAL WEATHER SERVICE IN UPTON NY HAS ISSUED A

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

* UNTIL 230 AM EDT...

* AT 101 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED  
MODERATE TO HEAVY RAINFALL MOVING NORTH ACROSS THE WARNED AREA. 
HOURLY RAINFALL RATES OF 2 TO 2.5 INCHES PER HOUR IS POSSIBLE... 
RESULTING IN SIGNIFICANT FLASH FLOODING. THE HEAVIEST RAIN WILL FALL 
ACROSS AREAS ALONG THE NAUGATUCK RIVER BASIN.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...URBAN AREAS...HIGHWAYS...STREETS AND UNDERPASSES
AS WELL AS OTHER DRAINAGE AREAS AND LOW LYING SPOTS.

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. IF FLASH FLOODING IS OBSERVED ACT QUICKLY. MOVE
UP TO HIGHER GROUND TO ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS
SUBJECT TO FLOODING WHEN WATER BEGINS RISING.

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.

&&

LAT...LON 4164 7293 4157 7294 4157 7292 4122 7310
      4125 7328 4157 7312 4157 7310 4160 7308
      4162 7303 4164 7302 4165 7298 4165 7294

$$
1 follow-up statement
872 
WGUS71 KOKX 150606
FFSOKX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE NEW YORK NY
206 AM EDT MON AUG 15 2011

CTC001-009-150616-
/O.CAN.KOKX.FF.W.0024.000000T0000Z-110815T0630Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
FAIRFIELD CT-NEW HAVEN CT-
206 AM EDT MON AUG 15 2011

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR WESTERN NEW HAVEN
AND FAIRFIELD COUNTIES...

THE STORM WHICH PROMPTED THE WARNING HAS WEAKEND AND NO LONGER 
POSES A HEAVY RAIN THREAT. 

ADDITIONAL FLASH FLOODING IS NO LONGER EXPECTED. THE WARNING HAS 
THEREFORE BEEN CANCELLED.


LAT...LON 4164 7293 4157 7294 4157 7292 4122 7310
      4125 7328 4157 7312 4157 7310 4160 7308
      4162 7303 4164 7302 4165 7298 4165 7294

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 14, 10:27 PM EDTAreal Flood AdvisoryOKXGreater Bridgeport Planning Region, Naugatuck Valley Planning Region48 min
Aug 14, 10:50 PM EDTFlash Flood WarningOKXNaugatuck Valley Planning Region55 min
Aug 14, 11:45 PM EDTFlash Flood WarningOKXNaugatuck Valley Planning Region73 min
Aug 15, 9:09 AM EDTAreal Flood AdvisoryOKXLower Connecticut River Valley Planning Region, Southeastern Connecticut Planning Region3 hr
Aug 15, 12:06 PM EDTAreal Flood AdvisoryOKXSoutheastern Connecticut Planning Region78 min
Aug 15, 4:21 PM EDTAreal Flood AdvisoryOKXGreater Bridgeport Planning Region54 min

Nearby

Flash Flood Warnings in Connecticut, 2011Every flash flood warning in 2011

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.