Alert archive / New York / Flash Flood Warnings in 2011
Flash Flood Warning 39, NWS New York, NY
NWS New York, NY issued this flash flood warning at Sep 23, 2011, 4:05 PM EDT for Orange County, Putnam County, Westchester County, New York. It was in force for 57 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
- Sep 23, 2011, 4:05 PM EDT (20:05 UTC)
- Expired
- Sep 23, 2011, 5:02 PM EDT
- In force
- 57 min
- Issued by
- NWS New York, NY
- Area
- Storm-based polygon
- Flood severity
- None
Counties Orange County, NY, Putnam County, NY, Westchester County, NY
The radar
The Brookhaven radar (KOKX), 116 km from the middle of the area, began a volume at 20:07 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 23, 4:05 PM EDT | FLASH FLOOD | North Pelham, NY | HUTCHINSON RIVER PARKWAY CLOSED NORTHBOUND FROM EXIT 8 TO EXIT 13 |
| Sep 23, 4:30 PM EDT | FLASH FLOOD | Mount Vernon, NY | ALL NORTHBOUND LANES OF BRONX RIVER PARKWAY CLOSED |
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, 8.1 hours before the alert went out and 116 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.
- Mixed-layer CAPE
- 454 J/kg
- Mixed-layer CIN
- -7 J/kg
- Mixed-layer LCL
- 434 m above ground
- 0-6 km bulk shear
- 36 kt
- 0-1 km storm-relative helicity
- 53 m²/s²
- 0-3 km storm-relative helicity
- 90 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 1.0
The text
As transmitted, in the capitals the NWS used until 2016.
257
WGUS51 KOKX 232005
FFWOKX
NYC071-079-119-232200-
/O.NEW.KOKX.FF.W.0039.110923T2005Z-110923T2200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE NEW YORK NY
405 PM EDT FRI SEP 23 2011
THE NATIONAL WEATHER SERVICE IN UPTON NY HAS ISSUED A
* FLASH FLOOD WARNING FOR...
WESTCHESTER COUNTY IN SOUTHEAST NEW YORK...
PUTNAM COUNTY IN SOUTHEAST NEW YORK...
ORANGE COUNTY IN SOUTHEAST NEW YORK...
* UNTIL 600 PM EDT...
* AT 403 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
MODERATE TO HEAVY RAINFALL MOVING ACROSS THE WARNING AREA. RAINFALL
RATES OF ONE TO ONE AN A HALF INCHES PER HOUR ARE POSSIBLE WITH
LOCALLY HIGHER AMOUNTS. 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.
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.
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.
TO REPORT FLOODING...HAVE THE NEAREST LAW ENFORCEMENT AGENCY RELAY
YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN UPTON
NY.
&&
LAT...LON 4151 7448 4160 7438 4163 7427 4160 7421
4161 7413 4158 7396 4153 7399 4145 7398
4150 7392 4152 7354 4137 7355 4134 7382
4089 7380 4093 7391 4114 7390 4123 7396
4129 7395 4132 7398 4115 7425 4149 7476
$$1 follow-up statement
304
WGUS71 KOKX 232102
FFSOKX
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE NEW YORK NY
502 PM EDT FRI SEP 23 2011
NYC071-079-119-232110-
/O.CAN.KOKX.FF.W.0039.000000T0000Z-110923T2200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
ORANGE NY-PUTNAM NY-WESTCHESTER NY-
502 PM EDT FRI SEP 23 2011
...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR WESTCHESTER...
PUTNAM AND ORANGE COUNTIES...
RAINFALL INTENSITY HAS WEAKENED OVER THE AREA ENDING THE IMMINENT
THREAT FOR FLASH FLOODING...THEREFORE THE FLASH FLOOD WARNING HAS
BEEN CANCELLED.
LAT...LON 4151 7448 4160 7438 4163 7427 4160 7421
4161 7413 4158 7396 4153 7399 4145 7398
4150 7392 4152 7354 4137 7355 4134 7382
4089 7380 4093 7391 4114 7390 4123 7396
4129 7395 4132 7398 4115 7425 4149 7476
$$The office that day
Everything else NWS New York, NY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 23, 2:36 AM EDT | Marine Dense Fog Advisory | OKX | 8 hr | |
| Sep 23, 2:37 AM EDT | Dense Fog Advisory | OKX | Nassau, Orange, Putnam, Rockland, Suffolk, Westchester | 6 hr |
| Sep 23, 12:09 PM EDT | Areal Flood Advisory | OKX | Bronx, Kings, New York, Queens, Richmond | 111 min |
| Sep 23, 2:04 PM EDT | Areal Flood Advisory | OKX | Bronx, New York, Rockland, Westchester | 86 min |
| Sep 23, 3:13 PM EDT | Flash Flood Warning | OKX | Kings, Nassau, Queens, Westchester | 103 min |
| Sep 23, 6:38 PM EDT | Areal Flood Warning | OKX | Orange, Putnam, Rockland | 5 hr |
| Sep 23, 7:38 PM EDT | Areal Flood Advisory | OKX | Bronx, Kings, New York, Putnam, Queens, Richmond and 2 more | 3 hr |
Nearby
Flash Flood Warnings in New York, 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.