Alert archive / Connecticut / Flash Flood Warnings in 2014

Flash Flood Warning 21, NWS New York, NY

July 15, 2014Greater Bridgeport Planning Region, Connecticut; Westchester County, New York

NWS New York, NY issued this flash flood warning at Jul 15, 2014, 2:40 PM EDT for Greater Bridgeport Planning Region, Connecticut; Westchester County, New York. It was in force for 3 hr. 4 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: Jul 15, 2014, 2:40 PM EDT (18:40 UTC)
Expired: Jul 15, 2014, 5:30 PM EDT
In force: 3 hr
Issued by: NWS New York, NY
Area: Storm-based polygon
Flood severity: None

Counties Greater Bridgeport Planning Region, CT, Westchester County, NY

The radar

The Brookhaven radar (KOKX), 73 km from the middle of the area, began a volume at 18:44 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
Jul 15, 3:10 PM EDT	FLASH FLOOD	White Plains, NY	BLOOMINGDALE ROAD CLOSED DUE TO FLOODING.
Jul 15, 3:10 PM EDT	FLASH FLOOD	White Plains, NY	BRONX RIVER PARKWAY CLOSED SOUTHBOUND DUE TO FLOODING.
Jul 15, 3:20 PM EDT	FLASH FLOOD	White Plains, NY	BRONX RIVER PARKWAY CLOSED SOUTHBOUND DUE TO FLOODING.
Jul 15, 3:40 PM EDT	FLASH FLOOD	Mount Vernon, NY	HUTCHINSON RIVER PARKWAY IS CLOSED BETWEEN EXITS 10 AND 12.

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, 6.7 hours before the alert went out and 73 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: 662 J/kg
Mixed-layer CIN: -104 J/kg
Mixed-layer LCL: 663 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 163 m²/s²
0-3 km storm-relative helicity: 180 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 2.7

Open this sounding in Storm Lab

The text

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

847 
WGUS51 KOKX 151840
FFWOKX
CTC001-NYC119-152130-
/O.NEW.KOKX.FF.W.0021.140715T1840Z-140715T2130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE NEW YORK NY
240 PM EDT TUE JUL 15 2014

THE NATIONAL WEATHER SERVICE IN UPTON NY HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  FAIRFIELD COUNTY IN SOUTHERN CONNECTICUT...
  WESTCHESTER COUNTY IN SOUTHEAST NEW YORK...

* UNTIL 530 PM EDT

* AT 234 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  A LARGE CLUSTER OF THUNDERSTORMS WITH TORRENTIAL RAINFALL OVER NEW
  YORK CITY MOVING NORTHEAST AT 30 MPH.

* THE STORMS WILL MOVE INTO THE WARNED AREA THROUGH 330 PM AND
  PRODUCE FLASH FLOODING. THE HEAVY RAIN WILL REDUCE
  VISIBILITY TO NEAR ZERO.

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.

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. MOST FLOOD DEATHS OCCUR IN AUTOMOBILES. 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.

WHEN YOU CAN DO SO SAFELY...PLEASE REPORT FLOODING TO THE NATIONAL
WEATHER SERVICE AT 1-800-226-0217...OR BY E MAIL AT
OKX.SPOTTERS@NOAA.GOV

&&

LAT...LON 4089 7384 4091 7385 4090 7387 4092 7392
      4099 7389 4109 7389 4126 7353 4110 7339
      4100 7357 4101 7359 4099 7363 4099 7361
      4097 7362 4099 7365 4094 7368 4088 7378

$$

JST

2 follow-up statements

180 
WGUS71 KOKX 151943
FFSOKX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE NEW YORK NY
343 PM EDT TUE JUL 15 2014

CTC001-NYC119-152130-
/O.CON.KOKX.FF.W.0021.000000T0000Z-140715T2130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WESTCHESTER NY-FAIRFIELD CT-
343 PM EDT TUE JUL 15 2014

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 530 PM EDT FOR 
SOUTHWESTERN FAIRFIELD AND SOUTHERN WESTCHESTER COUNTIES...

AT 326 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR SHOWED THE 
HEAVIEST THUNDERSTORMS OVER GREENWICH MOVING NORTHEAST AT 30 MPH.

1 TO 2 INCHES OF RAINFALL HAS CAUSES FLOODING AND ROAD CLOSURES IN 
FLOOD PRONE AREAS. LIGHT TO MODERATE RAIN OVER NEW YORK CITY WILL 
MOVE INTO THE AREA BETWEEN 4 AND 5 PM. 

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.

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...DON'T DROWN.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM EDT
TUESDAY EVENING FOR SOUTHERN CONNECTICUT AND NORTHEAST NEW JERSEY AND
SOUTHEAST NEW YORK.

&&

LAT...LON 4089 7384 4091 7385 4090 7387 4092 7392
      4099 7389 4109 7389 4126 7353 4110 7339
      4100 7357 4101 7359 4099 7363 4099 7361
      4097 7362 4099 7365 4094 7368 4088 7378

$$

JST

453 
WGUS71 KOKX 152100
FFSOKX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE NEW YORK NY
500 PM EDT TUE JUL 15 2014

CTC001-NYC119-152106-
/O.CAN.KOKX.FF.W.0021.000000T0000Z-140715T2130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WESTCHESTER NY-FAIRFIELD CT-
500 PM EDT TUE JUL 15 2014

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR SOUTHWESTERN 
FAIRFIELD AND SOUTHERN WESTCHESTER COUNTIES...

LIGHT RAIN IS NOW EXITING OVER GREENWICH AND NORWALK AREAS IN 
SOUTHWESTERN CONNECTICUT. FLOOD WATERS FROM THUNDERSTORMS EARLIER 
THIS AFTERNOON ARE RECEDING THOUGH SOME ROADWAYS REMAIN CLOSED. 

ADDITIONAL THUNDERSTORMS ARE EXPECTED OVERNIGHT THAT COULD LEAD TO 
ADDITIONAL FLASH FLOODING...SO A FLASH FLOOD WATCH REMAINS IN 
EFFECT. BE PREPARED FOR ADDITIONAL FLOODING OVERNIGHT.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM EDT
TUESDAY EVENING FOR SOUTHERN CONNECTICUT AND NORTHEAST NEW JERSEY AND
SOUTHEAST NEW YORK.

LAT...LON 4089 7384 4091 7385 4090 7387 4092 7392
      4099 7389 4109 7389 4126 7353 4110 7339
      4100 7357 4101 7359 4099 7363 4099 7361
      4097 7362 4099 7365 4094 7368 4088 7378

$$

JST

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 14, 8:33 PM EDT	Flash Flood Warning	OKX	Lower Connecticut River Valley Planning Region, Naugatuck Valley Planning Region	3 hr
Jul 14, 10:21 PM EDT	Areal Flood Advisory	OKX	Lower Connecticut River Valley Planning Region, Naugatuck Valley Planning Region, Southeastern Connecticut Planning Region	114 min
Jul 15, 1:02 PM EDT	Special Weather Statement	OKX		28 min
Jul 14, 8:31 PM EDT	Areal Flood Advisory	OKX	Bronx, Kings, New York, Queens, Richmond, Westchester	119 min
Jul 14, 9:37 PM EDT	Areal Flood Advisory	OKX	Nassau, Suffolk	3 hr
Jul 14, 10:28 PM EDT	Areal Flood Advisory	OKX	Kings, Queens	2 hr
Jul 14, 10:40 PM EDT	Special Marine Warning	OKX		65 min
Jul 15, 12:29 AM EDT	Areal Flood Advisory	OKX	Nassau, Suffolk	61 min
Jul 15, 4:11 AM EDT	Small Craft Advisory for Hazardous Seas	OKX		26 hr
Jul 15, 1:20 PM EDT	Special Weather Statement	OKX	Kings, New York, Queens, Richmond	25 min
Jul 15, 2:12 PM EDT	Flash Flood Warning	OKX	Bronx, Kings, New York, Queens, Richmond	3 hr
Jul 15, 2:27 PM EDT	Special Weather Statement	OKX	Nassau, Queens	48 min
Jul 15, 2:33 PM EDT	Special Weather Statement	OKX	Bronx	57 min
Jul 15, 2:52 PM EDT	Severe Thunderstorm Warning	OKX	Nassau	23 min
Jul 15, 2:55 PM EDT	Flash Flood Warning	OKX	Nassau, Queens	3 hr
Jul 15, 3:14 PM EDT	Special Weather Statement	OKX	Nassau	46 min
Jul 15, 3:20 PM EDT	Special Marine Warning	OKX		25 min
Jul 15, 3:26 PM EDT	Severe Thunderstorm Warning	OKX	Nassau	21 min
Jul 15, 3:39 PM EDT	Special Weather Statement	OKX	Nassau	51 min
Jul 15, 4:01 PM EDT	Severe Thunderstorm Warning	OKX	Suffolk	29 min
Jul 15, 4:23 PM EDT	Special Weather Statement	OKX	Suffolk	37 min
Jul 15, 4:35 PM EDT	Special Marine Warning	OKX		25 min
Jul 15, 5:30 PM EDT	Special Weather Statement	OKX	Bronx, Kings, Nassau, New York, Queens, Richmond	45 min
Jul 15, 6:19 PM EDT	Special Marine Warning	OKX		56 min
Jul 15, 6:24 PM EDT	Marine Dense Fog Advisory	OKX		6 hr
Jul 15, 6:56 PM EDT	Special Weather Statement	OKX	Nassau	64 min
Jul 15, 7:17 PM EDT	Flash Flood Warning	OKX	Kings, Nassau, Queens	3 hr
Jul 15, 7:53 PM EDT	Areal Flood Advisory	OKX	Suffolk	112 min
Jul 15, 7:59 PM EDT	Special Marine Warning	OKX		31 min

Nearby

Flash Flood Warnings in Connecticut, 2014 Flash Flood Warnings in New York, 2014 Every flash flood warning in 2014

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.