Alert archive / New York / Flash Flood Warnings in 2016

Flash Flood Warning 5, NWS New York, NY

July 31, 2016Bergen County, Hudson County, New Jersey; 4 counties in New York

NWS New York, NY issued this flash flood warning at Jul 31, 2016, 9:35 PM EDT for Bergen County, Hudson County, New Jersey; 4 counties in New York. It was in force for 3 hr. 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
Jul 31, 2016, 9:35 PM EDT (01:35 UTC)
Expired
Aug 1, 2016, 12:30 AM EDT
In force
3 hr
Issued by
NWS New York, NY
Area
Storm-based polygon
Flood severity
None

Counties Bergen County, NJ, Hudson County, NJ, Bronx County, NY, Kings County, NY, New York County, NY, Queens County, NY

The radar

The Brookhaven radar (KOKX), 89 km from the middle of the area, began a volume at 01:37 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

TimeReportWhereRemark
Jul 31, 10:01 PM EDTFLASH FLOODLyndhurst, NJORIENT WAY CLOSED DUE TO FLOODING BETWEEN NEW JERSEY AVENUE AND PAGE AVENUE.
Jul 31, 10:08 PM EDTFLASH FLOODRutherford, NJRIVERSIDE AVENUE AT WEST PIERREPONT AVENUE FLOODED. REPORT VIA SOCIAL MEDIA.

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 00:00Z, 1.6 hours before the alert went out and 89 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-pSkew-T log-p diagram, Brookhaven, NY at 00:00Z on 2016-08-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 51 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Brookhaven, NY at 00:00Z on 2016-08-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 84 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
51 J/kg
Mixed-layer CIN
-46 J/kg
Mixed-layer LCL
553 m above ground
0-6 km bulk shear
27 kt
0-1 km storm-relative helicity
84 m²/s²
0-3 km storm-relative helicity
109 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.3

Open this sounding in Storm Lab

The text

As transmitted.

161 
WGUS51 KOKX 010135
FFWOKX
NJC003-017-NYC005-047-061-081-010430-
/O.NEW.KOKX.FF.W.0005.160801T0135Z-160801T0430Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE NEW YORK NY
935 PM EDT SUN JUL 31 2016

THE NATIONAL WEATHER SERVICE IN UPTON NY HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTHEASTERN BERGEN COUNTY IN NORTHEASTERN NEW JERSEY...
  HUDSON COUNTY IN NORTHEASTERN NEW JERSEY...
  KINGS COUNTY IN SOUTHEASTERN NEW YORK...
  QUEENS COUNTY IN SOUTHEASTERN NEW YORK...
  NEW YORK COUNTY IN SOUTHEASTERN NEW YORK...
  BRONX COUNTY IN SOUTHEASTERN NEW YORK...

* UNTIL 1230 AM EDT

* AT 934 PM EDT...DOPPLER RADAR INDICATED HEAVY RAIN ACROSS THE
  WARNED AREA. UP TO ONE INCH OF RAIN IN LESS THAN AN HOUR IS LIKELY
  WITH THIS STORM. FLASH FLOODING IS EXPECTED TO BEGIN SHORTLY.

RAINFALL OF 2 TO 3 THREES WILL BE POSSIBLE IN THE WARNED AREA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

MOVE TO HIGHER GROUND NOW. ACT QUICKLY TO PROTECT YOUR LIFE.

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 4070 7403 4069 7403 4079 7414 4099 7399
      4095 7391 4092 7392 4092 7391 4090 7386
      4091 7385 4089 7383 4088 7379 4089 7379
      4088 7376 4064 7397

$$
1 follow-up statement
934 
WGUS71 KOKX 010305
FFSOKX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE NEW YORK NY
1105 PM EDT SUN JUL 31 2016

NJC003-017-NYC005-047-061-081-010313-
/O.CAN.KOKX.FF.W.0005.000000T0000Z-160801T0430Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BERGEN NJ-HUDSON NJ-KINGS NY-QUEENS NY-NEW YORK NY-BRONX NY-
1105 PM EDT SUN JUL 31 2016

...THE FLASH FLOOD WARNING FOR SOUTHEASTERN BERGEN...HUDSON...
KINGS...QUEENS...NEW YORK AND BRONX COUNTIES IS CANCELLED...

THE HEAVY RAIN HAS ENDED. FLOODING IS NO LONGER EXPECTED TO POSE A
THREAT. PLEASE CONTINUE TO HEED ANY REMAINING ROAD CLOSURES.

A FLOOD ADVISORY REMAINS IN EFFECT UNTIL 1115 PM AND WILL BE
ALLOWED TO EXPIRE AT THAT TIME.

LAT...LON 4070 7403 4069 7403 4079 7414 4099 7399
      4095 7391 4092 7392 4092 7391 4090 7386
      4091 7385 4089 7383 4088 7379 4089 7379
      4088 7376 4064 7397

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 31, 8:19 PM EDTSpecial Weather StatementOKXBergen, Passaic56 min
Jul 31, 8:34 PM EDTFlash Flood WarningOKXBergen, Passaic3 hr
Jul 31, 9:10 PM EDTAreal Flood AdvisoryOKXBergen, Hudson2 hr
Jul 31, 9:27 PM EDTSpecial Weather StatementOKXHudson48 min
Jul 31, 10:35 PM EDTAreal Flood AdvisoryOKXEssex, Hudson, Union3 hr
Aug 1, 11:32 AM EDTFlash Flood WatchOKXBergen, Passaic16 hr
Jul 31, 9:44 PM EDTAreal Flood AdvisoryOKXRockland, Westchester3 hr
Jul 31, 9:50 PM EDTAreal Flood AdvisoryOKXKings, Nassau, Queens115 min
Aug 1, 12:14 AM EDTSpecial Marine WarningOKX31 min
Aug 1, 1:34 AM EDTSpecial Marine WarningOKX41 min
Aug 1, 7:46 AM EDTSmall Craft AdvisoryOKX7 hr

Nearby

Flash Flood Warnings in New York, 2016Flash Flood Warnings in New Jersey, 2016Every 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.