Alert archive / Connecticut / Flash Flood Warnings in 2011

Flash Flood Warning 42, NWS New York, NY

September 30, 2011Greater Bridgeport Planning Region, Connecticut

NWS New York, NY issued this flash flood warning at Sep 30, 2011, 6:35 PM EDT for Greater Bridgeport Planning Region, Connecticut. It was in force for 103 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Sep 30, 2011, 6:35 PM EDT (22:35 UTC)
Expired: Sep 30, 2011, 8:18 PM EDT
In force: 103 min
Issued by: NWS New York, NY
Area: Storm-based polygon
Flood severity: None

County Greater Bridgeport Planning Region, CT

The radar

The Brookhaven radar (KOKX), 69 km from the middle of the area, began a volume at 22:35 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.

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 10.6 hours before the alert went out and 68 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1129 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: 90 m²/s²
0-3 km storm-relative helicity: 131 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

134 
WGUS51 KOKX 302235
FFWOKX
CTC001-010030-
/O.NEW.KOKX.FF.W.0042.110930T2235Z-111001T0030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE NEW YORK NY
635 PM EDT FRI SEP 30 2011

THE NATIONAL WEATHER SERVICE IN UPTON NY HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  FAIRFIELD COUNTY IN SOUTHERN CONNECTICUT...

* UNTIL 830 PM EDT...

* AT 630 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
FLASH FLOODING FROM THUNDERSTORMS ALONG A LINE EXTENDING 11 MILES 
NORTH OF NEWTOWN TO DANBURY TO RIDGEFIELD TO STAMFORD...MOVING 
NORTHEAST AT 20 MPH.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 4150 7343 4152 7339 4149 7337 4147 7330
      4145 7330 4143 7322 4132 7310 4100 7358
      4100 7362 4099 7363 4099 7361 4097 7363
      4106 7369 4113 7367 4121 7348 4131 7355
      4137 7351 4156 7346

$$

DSW

2 follow-up statements

677 
WGUS71 KOKX 302324
FFSOKX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE NEW YORK NY
724 PM EDT FRI SEP 30 2011

CTC001-010030-
/O.CON.KOKX.FF.W.0042.000000T0000Z-111001T0030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
FAIRFIELD CT-
724 PM EDT FRI SEP 30 2011

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 830 PM EDT FOR
FAIRFIELD COUNTY...

AT 724 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE THUNDERSTORMS PRODUCING FLASH FLOODING.  THESE STORMS WERE 
LOCATED ALONG A LINE LINE EXTENDING FROM 7 MILES NORTHWEST OF 
WATERBURY TO SOUTHBURY TO 6 MILES SOUTH OF NEWTOWN TO NEW 
CANAAN...MOVING NORTHEAST AT 20 MPH.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

ADDITIONAL RAINFALL AMOUNTS OF 1 TO 2 INCHES ARE POSSIBLE IN THE 
WARNED AREA.

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE 
ROADWAY. MOST FLOODING DEATHS OCCUR IN AUTOMOBILES. TURN AROUND AND 
FIND ANOTHER ROUTE.

BE PREPARED TO TAKE ACTION IF THE FLOODING THREAT INCREASES...OR A
WARNING IS ISSUED.

&&

LAT...LON 4150 7343 4152 7339 4149 7337 4147 7330
      4145 7330 4143 7323 4134 7312 4102 7355
      4117 7357 4121 7348 4131 7355 4138 7351
      4151 7347 4153 7345

$$

DSW

483 
WGUS71 KOKX 010018
FFSOKX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE NEW YORK NY
818 PM EDT FRI SEP 30 2011

CTC001-010024-
/O.CAN.KOKX.FF.W.0042.000000T0000Z-111001T0030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
FAIRFIELD CT-
818 PM EDT FRI SEP 30 2011

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR FAIRFIELD COUNTY...

THE HEAVIEST RAINFALL ACTIVITY HAS MOVED EAST OF THE WARNED AREA.

LAT...LON 4150 7343 4152 7339 4149 7337 4147 7330
      4145 7330 4143 7323 4134 7312 4102 7355
      4117 7357 4121 7348 4131 7355 4138 7351
      4151 7347 4153 7345

$$

MAS

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 30, 3:19 AM EDT	Coastal Flood Statement	OKX	Greater Bridgeport Planning Region, Naugatuck Valley Planning Region	11 hr
Sep 30, 6:08 PM EDT	Areal Flood Advisory	OKX	Greater Bridgeport Planning Region	67 min
Sep 30, 7:03 PM EDT	Areal Flood Advisory	OKX	Naugatuck Valley Planning Region	87 min
Sep 30, 7:59 PM EDT	Areal Flood Advisory	OKX	Greater Bridgeport Planning Region, Lower Connecticut River Valley Planning Region, Naugatuck Valley Planning Region	91 min

Nearby

Flash Flood Warnings in Connecticut, 2011 Every 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.