Alert archive / New York / Flash Flood Warnings in 2011

Flash Flood Warning 29, NWS New York, NY

August 19, 2011Putnam County, Rockland County, Westchester County, New York

NWS New York, NY issued this flash flood warning at Aug 19, 2011, 6:27 PM EDT for Putnam County, Rockland County, Westchester County, New York. It was in force for 42 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: Aug 19, 2011, 6:27 PM EDT (22:27 UTC)
Expired: Aug 19, 2011, 7:09 PM EDT
In force: 42 min
Issued by: NWS New York, NY
Area: Storm-based polygon
Flood severity: None

Counties Putnam County, NY, Rockland County, NY, Westchester County, NY

The radar

The Brookhaven radar (KOKX), 87 km from the middle of the area, began a volume at 22:30 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
Aug 19, 6:30 PM EDT	FLASH FLOOD	Peekskill, NY	MAIN STREET...PARK STREET...AND CENTRAL AVENUE CLOSED DUE TO FLOODING.

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, 10.5 hours before the alert went out and 87 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: 897 J/kg
Mixed-layer CIN: -66 J/kg
Mixed-layer LCL: 993 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: -12 m²/s²
0-3 km storm-relative helicity: 23 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.

939 
WGUS51 KOKX 192227
FFWOKX
NYC079-087-119-200000-
/O.NEW.KOKX.FF.W.0029.110819T2227Z-110820T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE NEW YORK NY
627 PM EDT FRI AUG 19 2011

THE NATIONAL WEATHER SERVICE IN UPTON NY HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  WESTCHESTER COUNTY IN SOUTHEAST NEW YORK...
  ROCKLAND COUNTY IN SOUTHEAST NEW YORK...
  PUTNAM COUNTY IN SOUTHEAST NEW YORK...

* UNTIL 800 PM EDT...

* AT 621 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  FLASH FLOODING FROM THUNDERSTORMS OVER THE WARNED AREA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...HIGHWAYS AND UNDERPASSES. ADDITIONALLY...COUNTRY
ROADS AND FARMLANDS ALONG THE BANKS OF CREEKS...STREAMS AND OTHER LOW
LYING AREAS ARE SUBJECT TO FLOODING.

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 4153 7353 4139 7354 4112 7367 4110 7373
      4116 7406 4152 7375 4153 7360

$$

JM

1 follow-up statement

117 
WGUS71 KOKX 192309
FFSOKX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE NEW YORK NY
709 PM EDT FRI AUG 19 2011

NYC079-087-119-192320-
/O.CAN.KOKX.FF.W.0029.000000T0000Z-110820T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
PUTNAM NY-ROCKLAND NY-WESTCHESTER NY-
709 PM EDT FRI AUG 19 2011

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR WESTCHESTER...
ROCKLAND AND PUTNAM COUNTIES...

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

LAT...LON 4153 7353 4139 7354 4112 7367 4110 7373
      4116 7406 4152 7375 4153 7360

$$

MALOIT

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 18, 8:19 PM EDT	Severe Thunderstorm Warning	OKX	Nassau, Queens	26 min
Aug 18, 8:30 PM EDT	Areal Flood Advisory	OKX	Nassau, Queens, Suffolk	60 min
Aug 18, 8:45 PM EDT	Severe Thunderstorm Warning	OKX	Nassau, Suffolk	30 min
Aug 18, 8:54 PM EDT	Special Weather Statement	OKX	Putnam, Westchester	66 min
Aug 18, 9:03 PM EDT	Special Marine Warning	OKX		42 min
Aug 18, 9:33 PM EDT	Areal Flood Advisory	OKX	Suffolk	57 min
Aug 18, 9:33 PM EDT	Severe Thunderstorm Warning	OKX	Suffolk	42 min
Aug 18, 9:40 PM EDT	Special Marine Warning	OKX		35 min
Aug 18, 10:01 PM EDT	Severe Thunderstorm Warning	OKX	Suffolk	26 min
Aug 18, 10:38 PM EDT	Special Weather Statement	OKX	Bronx, Rockland	52 min
Aug 18, 10:45 PM EDT	Severe Thunderstorm Warning	OKX	Rockland, Westchester	45 min
Aug 19, 12:33 PM EDT	Special Weather Statement	OKX	Orange	57 min
Aug 19, 3:16 PM EDT	Special Weather Statement	OKX	Orange	44 min
Aug 19, 4:00 PM EDT	Special Weather Statement	OKX	Orange	45 min
Aug 19, 4:03 PM EDT	Severe Thunderstorm Warning	OKX	Orange	42 min
Aug 19, 4:15 PM EDT	Areal Flood Advisory	OKX	Orange	60 min
Aug 19, 4:28 PM EDT	Flash Flood Warning	OKX	Orange	2 hr
Aug 19, 4:43 PM EDT	Severe Thunderstorm Warning	OKX	Orange, Rockland	62 min
Aug 19, 5:17 PM EDT	Severe Thunderstorm Warning	OKX	Orange, Putnam	43 min
Aug 19, 5:42 PM EDT	Severe Thunderstorm Warning	OKX	Orange, Rockland	30 min
Aug 19, 5:46 PM EDT	Severe Thunderstorm Warning	OKX	Putnam	59 min
Aug 19, 5:59 PM EDT	Flash Flood Warning	OKX	Rockland	91 min
Aug 19, 6:03 PM EDT	Severe Thunderstorm Warning	OKX	Putnam, Rockland, Westchester	45 min
Aug 19, 6:24 PM EDT	Special Marine Warning	OKX		51 min
Aug 19, 6:29 PM EDT	Severe Thunderstorm Warning	OKX	Rockland, Westchester	46 min
Aug 19, 6:46 PM EDT	Flash Flood Warning	OKX	Richmond	59 min
Aug 19, 6:59 PM EDT	Severe Thunderstorm Warning	OKX	Kings, Richmond	46 min
Aug 19, 7:00 PM EDT	Severe Thunderstorm Warning	OKX	Bronx, New York, Westchester	45 min
Aug 19, 7:09 PM EDT	Special Weather Statement	OKX	New York	51 min
Aug 19, 7:16 PM EDT	Severe Thunderstorm Warning	OKX	Kings, New York, Queens	44 min
Aug 19, 7:18 PM EDT	Special Marine Warning	OKX		57 min
Aug 19, 7:24 PM EDT	Flash Flood Warning	OKX	Bronx, Kings, Nassau, New York, Queens, Richmond and 1 more	66 min
Aug 19, 7:35 PM EDT	Special Marine Warning	OKX		55 min
Aug 19, 7:46 PM EDT	Severe Thunderstorm Warning	OKX	Nassau, Queens	44 min

Nearby

Flash Flood Warnings in New York, 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.