Alert archive / New York / Flash Flood Warnings in 2016

Flash Flood Warning 10, NWS New York, NY

August 20, 2016Suffolk County, New York

NWS New York, NY issued this flash flood warning at Aug 20, 2016, 12:22 PM EDT for Suffolk County, New York. It was in force for 3 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: Aug 20, 2016, 12:22 PM EDT (16:22 UTC)
Expired: Aug 20, 2016, 3:15 PM EDT
In force: 3 hr
Issued by: NWS New York, NY
Area: Storm-based polygon
Flood severity: None

County Suffolk County, NY

The radar

The Brookhaven radar (KOKX), 22 km from the middle of the area, began a volume at 16:22 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 12:00Z, 4.4 hours before the alert went out and 22 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: 957 J/kg
Mixed-layer CIN: -7 J/kg
Mixed-layer LCL: 652 m above ground
0-6 km bulk shear: 8 kt
0-1 km storm-relative helicity: -13 m²/s²
0-3 km storm-relative helicity: 12 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

864 
WGUS51 KOKX 201622
FFWOKX
NYC103-201915-
/O.NEW.KOKX.FF.W.0010.160820T1622Z-160820T1915Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE NEW YORK NY
1222 PM EDT SAT AUG 20 2016

THE NATIONAL WEATHER SERVICE IN UPTON NY HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  CENTRAL SUFFOLK COUNTY IN SOUTHEASTERN NEW YORK...

* UNTIL 315 PM EDT

* AT 1220 PM EDT...DOPPLER RADAR INDICATED THUNDERSTORMS PRODUCING
  HEAVY RAIN ACROSS THE WARNED AREA AND IS INDICATING TWO TO FOUR
  INCHES OF RAIN HAS ALREADY FALLEN. FLASH FLOODING IS EXPECTED TO
  BEGIN SHORTLY.

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  MATTITUCK...CALVERTON...SOUND AVENUE...JAMESPORT...AQUEBOGUE...
  LAUREL AND PECONIC RIVER.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TURN AROUND...DON'T DROWN WHEN ENCOUNTERING FLOODED ROADS. MOST FLOOD
DEATHS OCCUR IN VEHICLES.

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF YOU ARE IN THE WARNED AREA MOVE TO HIGHER GROUND IMMEDIATELY.
RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE
PRECAUTIONS TO PROTECT LIFE AND PROPERTY.

&&

LAT...LON 4087 7276 4094 7278 4099 7264 4100 7259
      4102 7256 4097 7252 4093 7257 4092 7257
      4092 7258 4093 7258 4092 7259 4092 7261

$$

24

2 follow-up statements

082 
WGUS71 KOKX 201731
FFSOKX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE NEW YORK NY
131 PM EDT SAT AUG 20 2016

NYC103-201915-
/O.CON.KOKX.FF.W.0010.000000T0000Z-160820T1915Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SUFFOLK NY-
131 PM EDT SAT AUG 20 2016

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 315 PM EDT FOR
CENTRAL SUFFOLK COUNTY...

AT 130 PM EDT...THE RAIN HAS LIGHTENED SIGNIFICANTLY ACROSS THE
WARNED AREA. HOWEVER...THERE IS LIKELY RESIDUAL FLOODING
OCCURRING.

SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
MATTITUCK...CALVERTON...SOUND AVENUE...JAMESPORT...AQUEBOGUE...
LAUREL AND PECONIC RIVER.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

PLEASE REPORT FLOODING TO YOUR LOCAL LAW ENFORCEMENT AGENCY WHEN YOU
CAN DO SO SAFELY.

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF YOU ARE IN THE WARNED AREA MOVE TO HIGHER GROUND IMMEDIATELY.
RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE
PRECAUTIONS TO PROTECT LIFE AND PROPERTY.

&&

LAT...LON 4087 7276 4094 7278 4099 7264 4100 7259
      4102 7256 4097 7252 4093 7257 4092 7257
      4092 7258 4093 7258 4092 7259 4092 7261

$$

24

988 
WGUS71 KOKX 201842
FFSOKX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE NEW YORK NY
242 PM EDT SAT AUG 20 2016

NYC103-201851-
/O.CAN.KOKX.FF.W.0010.000000T0000Z-160820T1915Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SUFFOLK NY-
242 PM EDT SAT AUG 20 2016

...THE FLASH FLOOD WARNING FOR CENTRAL SUFFOLK COUNTY IS CANCELLED...

THE HEAVY RAIN HAS ENDED AND ADDITIONAL FLOODING IS NO LONGER
EXPECTED. PLEASE CONTINUE TO HEED ANY REMAINING ROAD CLOSURES.

LAT...LON 4087 7276 4094 7278 4099 7264 4100 7259
      4102 7256 4097 7252 4093 7257 4092 7257
      4092 7258 4093 7258 4092 7259 4092 7261

$$

24

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 20, 10:13 AM EDT	Special Weather Statement	OKX	Suffolk	47 min
Aug 20, 10:23 AM EDT	Special Weather Statement	OKX	Suffolk	37 min
Aug 20, 11:36 AM EDT	Areal Flood Advisory	OKX	Suffolk	114 min
Aug 20, 11:54 AM EDT	Areal Flood Advisory	OKX	Suffolk	2 hr
Aug 20, 12:30 PM EDT	Flash Flood Warning	OKX	Suffolk	3 hr
Aug 20, 12:52 PM EDT	Areal Flood Advisory	OKX	Nassau	113 min

Nearby

Flash Flood Warnings in New York, 2016 Every flash flood warning in 2016

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.