Alert archive / New York / Flash Flood Warnings in 2011

Flash Flood Warning 21, NWS New York, NY

August 14, 2011Suffolk County, New York

NWS New York, NY issued this flash flood warning at Aug 14, 2011, 5:03 PM EDT for Suffolk County, New York. It was in force for 57 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: Aug 14, 2011, 5:03 PM EDT (21:03 UTC)
Expired: Aug 14, 2011, 6:00 PM EDT
In force: 57 min
Issued by: NWS New York, NY
Area: Storm-based polygon
Flood severity: None

County Suffolk County, NY

The radar

The Brookhaven radar (KOKX), 15 km from the middle of the area, began a volume at 21:03 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

Albany, NY (KALY), launched 12:00Z, 9.1 hours before the alert went out and 223 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: 99 J/kg
Mixed-layer CIN: -43 J/kg
Mixed-layer LCL: 657 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 9 m²/s²
0-3 km storm-relative helicity: 38 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.

037 
WGUS51 KOKX 142103
FFWOKX
NYC103-142200-
/O.NEW.KOKX.FF.W.0021.110814T2103Z-110814T2200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE NEW YORK NY
503 PM EDT SUN AUG 14 2011

THE NATIONAL WEATHER SERVICE IN UPTON NY HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  CENTRAL AND EASTERN SUFFOLK COUNTY IN SOUTHEAST NEW YORK...

* UNTIL 600 PM EDT...

* AT 454 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
  HEAVY SHOWERS AND ISOLATED THUNDERSTORMS PRODUCING ESTIMATED 
  HOURLY RAINFALL RATES FROM 1 TO 2 INCHES PER HOUR. UP TO AN 
  ADDITIONAL 2 INCHES OF RAIN IS POSSIBLE THROUGH 6 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.

&&

LAT...LON 4097 7291 4099 7262 4109 7243 4099 7245
      4099 7247 4095 7244 4099 7249 4092 7261
      4093 7245 4088 7246 4087 7248 4084 7246
      4072 7293 4076 7288 4076 7291 4071 7296
      4074 7295 4074 7296 4070 7298

$$
!GC

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 14, 2:23 AM EDT	Areal Flood Advisory	OKX	Bronx, Kings, New York, Queens, Richmond	82 min
Aug 14, 2:59 AM EDT	Areal Flood Advisory	OKX	Nassau	91 min
Aug 14, 3:28 AM EDT	Areal Flood Advisory	OKX	Kings, Queens, Richmond	62 min
Aug 14, 4:33 AM EDT	Areal Flood Advisory	OKX	Nassau	87 min
Aug 14, 4:53 AM EDT	Areal Flood Advisory	OKX	Suffolk	112 min
Aug 14, 5:22 AM EDT	Small Craft Advisory	OKX		29 hr
Aug 14, 6:04 AM EDT	Areal Flood Advisory	OKX	New York, Richmond	86 min
Aug 14, 6:08 AM EDT	Areal Flood Advisory	OKX	Nassau, Suffolk	4 hr
Aug 14, 7:40 AM EDT	Areal Flood Advisory	OKX	Kings, Queens	2 hr
Aug 14, 9:20 AM EDT	Flash Flood Watch	OKX	Bronx, Kings, Nassau, New York, Orange, Putnam and 5 more	34 hr
Aug 14, 9:30 AM EDT	Areal Flood Advisory	OKX	Kings, New York, Queens, Richmond	60 min
Aug 14, 10:00 AM EDT	Areal Flood Advisory	OKX	Nassau, Suffolk	23 min
Aug 14, 10:18 AM EDT	Flash Flood Warning	OKX	Kings, Nassau, Queens, Suffolk	4 hr
Aug 14, 4:05 PM EDT	Areal Flood Advisory	OKX	Suffolk	55 min
Aug 14, 4:09 PM EDT	Areal Flood Advisory	OKX	Suffolk	66 min
Aug 14, 5:31 PM EDT	Areal Flood Advisory	OKX	Bronx, Kings, New York, Queens, Richmond	59 min
Aug 14, 6:06 PM EDT	Areal Flood Advisory	OKX	Suffolk	54 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.