Alert archive / New York / Flash Flood Warnings in 2011

Flash Flood Warning 2, NWS New York, NY

May 17, 2011Suffolk County, New York

NWS New York, NY issued this flash flood warning at May 17, 2011, 9:44 PM EDT for Suffolk County, New York. It was in force for 2 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: May 17, 2011, 9:44 PM EDT (01:44 UTC)
Expired: May 17, 2011, 11:45 PM EDT
In force: 2 hr
Issued by: NWS New York, NY
Area: Storm-based polygon
Flood severity: None

County Suffolk County, NY

The radar

The Brookhaven radar (KOKX), 52 km from the middle of the area, began a volume at 01:45 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 00:00Z, 1.7 hours before the alert went out and 52 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: 442 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 197 m²/s²
0-3 km storm-relative helicity: 216 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.

156 
WGUS51 KOKX 180144
FFWOKX
NYC103-180345-
/O.NEW.KOKX.FF.W.0002.110518T0144Z-110518T0345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE NEW YORK NY
944 PM EDT TUE MAY 17 2011

THE NATIONAL WEATHER SERVICE IN UPTON NY HAS ISSUED A

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

* UNTIL 1145 PM EDT...

* AT 937 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  NUMEROUS SHOWERS AND EMBEDDED THUNDERSTORMS DEVELOPING OVER THE    
  ATLANTIC AND TRACKING TOWARDS THE TWIN FORKS OF LONG ISLAND. THIS  
  CONVEYOR BELT OF MOISTURE WILL PRODUCE PERIODS OF HEAVY RAIN. 

RAINFALL RATES OF AROUND ONE INCH PER HOUR CAN BE EXPECTED AT TIMES. 
THIS WILL LEAD TO FLOODING ON AREA ROADWAYS OVERNIGHT.

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.

TO REPORT FLOODING...HAVE THE NEAREST LAW ENFORCEMENT AGENCY RELAY
YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN UPTON
NY.

&&

LAT...LON 4086 7241 4092 7247 4095 7245 4102 7256
      4119 7219 4119 7216 4119 7215 4111 7229
      4113 7233 4111 7233 4103 7219 4106 7211
      4112 7213 4110 7207 4105 7210 4105 7214
      4101 7211 4109 7194 4107 7185

$$

JMC

2 follow-up statements

522 
WGUS71 KOKX 180301
FFSOKX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE NEW YORK NY
1101 PM EDT TUE MAY 17 2011

NYC103-180345-
/O.CON.KOKX.FF.W.0002.000000T0000Z-110518T0345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SUFFOLK NY-
1101 PM EDT TUE MAY 17 2011

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1145 PM EDT FOR
SUFFOLK COUNTY...

AT 1058 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED  
ANA REA OF MODERATE RAIN WITH EMBEDDED SHOWERS AND THUNDERSTORMS 
OVER THE ATLANTIC AND TRACKING TOWARDS THE EASTERN TWIN FORKS OF 
LONG ISLAND. AREAS UNDERNEATH THE EMBEDDED CONVECTION WILL 
EXPERIENCE LOCALLY HEAVY RAINFALL...WHICH WILL CAUSE LOCALIZED 
FLOODING. 

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.

TO REPORT FLOODING...HAVE THE NEAREST LAW ENFORCEMENT AGENCY RELAY
YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN UPTON
NY.

&&

LAT...LON 4090 7229 4099 7238 4104 7233 4108 7239
      4103 7243 4106 7247 4116 7223 4109 7230
      4109 7228 4119 7219 4119 7216 4109 7228
      4103 7219 4106 7212 4112 7213 4110 7207
      4104 7214 4101 7211 4109 7194 4107 7185

$$

MALOIT

620 
WGUS71 KOKX 180339
FFSOKX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE NEW YORK NY
1139 PM EDT TUE MAY 17 2011

NYC103-180349-
/O.EXP.KOKX.FF.W.0002.000000T0000Z-110518T0345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SUFFOLK NY-
1139 PM EDT TUE MAY 17 2011

...THE FLASH FLOOD WARNING WILL EXPIRE AT 1145 PM EDT FOR SUFFOLK
COUNTY...

LAT...LON 4090 7229 4099 7238 4104 7233 4108 7239
      4103 7243 4106 7247 4116 7223 4109 7230
      4109 7228 4119 7219 4119 7216 4109 7228
      4103 7219 4106 7212 4112 7213 4110 7207
      4104 7214 4101 7211 4109 7194 4107 7185

$$

MALOIT

The office that day

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

Issued	Product	Office	Counties	Lasted
May 18, 12:36 AM EDT	Areal Flood Advisory	OKX	Suffolk	54 min
May 18, 3:43 AM EDT	Coastal Flood Warning	OKX	Nassau	19 hr
May 18, 3:43 AM EDT	Coastal Flood Advisory	OKX	Bronx, Kings, Nassau, New York, Queens, Richmond and 2 more	23 hr
May 18, 1:08 PM EDT	Special Weather Statement	OKX	Bronx, Kings, Nassau, New York, Queens, Richmond	52 min
May 18, 2:26 PM EDT	Areal Flood Advisory	OKX	Bronx, Kings, Nassau, New York, Queens	4 hr
May 18, 2:28 PM EDT	Areal Flood Advisory	OKX	Rockland, Westchester	4 hr
May 18, 2:29 PM EDT	Areal Flood Advisory	OKX	Bronx, Kings, Nassau, New York, Queens	29 min
May 18, 3:36 PM EDT	Flash Flood Warning	OKX	Richmond	3 hr
May 18, 4:31 PM EDT	Areal Flood Advisory	OKX	Nassau, Suffolk	89 min
May 18, 6:14 PM EDT	Areal Flood Advisory	OKX	Suffolk	61 min
May 18, 6:30 PM EDT	Areal Flood Advisory	OKX	Putnam	90 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.