Alert archive / New Jersey / Flash Flood Warnings in 2015

Flash Flood Warning 4, NWS Philadelphia/Mount Holly

May 31, 2015Middlesex County, New Jersey

NWS Philadelphia/Mount Holly issued this flash flood warning at May 31, 2015, 6:37 PM EDT for Middlesex County, New Jersey. It was in force for 5 hr. 5 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
May 31, 2015, 6:37 PM EDT (22:37 UTC)
Expired
May 31, 2015, 11:30 PM EDT
In force
5 hr
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon
Flood severity
None

County Middlesex County, NJ

The radar

The Philadelphia radar (KDIX), 62 km from the middle of the area, began a volume at 22:39 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
May 31, 7:00 PM EDTFLASH FLOODSayreville, NJSEVERAL ROADS REPORTED TO BE FLOODED IN SAYREVILLE AND SURROUNDING AREAS.
May 31, 7:30 PM EDTHEAVY RAIN 4.5South Amboy, NJ4.50 INCHES OF RAIN FELL IN 90 MINUTES.
May 31, 7:53 PM EDTFLASH FLOODOld Bridge Twp, NJROADWAYS FLOODED WITH SOME EVACUATIONS AND PROPERTY DAMAGE.
May 31, 7:53 PM EDTHEAVY RAIN 4.97Old Bridge Twp, NJIN TWO HOURS
May 31, 7:55 PM EDTFLASH FLOODSouth Amboy, NJFLOODING ON ROUTE 35

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, 10.6 hours before the alert went out and 131 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 12:00Z on 2015-05-31Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 106 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 12:00Z on 2015-05-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 41 square meters per square second.1939Sfc1 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
106 J/kg
Mixed-layer CIN
-105 J/kg
Mixed-layer LCL
746 m above ground
0-6 km bulk shear
12 kt
0-1 km storm-relative helicity
41 m²/s²
0-3 km storm-relative helicity
41 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.

492 
WGUS51 KPHI 312237
FFWPHI
NJC023-010330-
/O.NEW.KPHI.FF.W.0004.150531T2237Z-150601T0330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
637 PM EDT SUN MAY 31 2015

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ  HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  MIDDLESEX COUNTY IN NORTHERN NEW JERSEY...

* UNTIL 1130 PM EDT
    
* AT 636 PM EDT...DOPPLER RADAR INDICATED A THUNDERSTORM PRODUCING
  HEAVY RAIN ACROSS THE WARNED AREA. FLASH FLOODING IS EXPECTED TO
  BEGIN SHORTLY. ADDITIONAL THUNDERSTORMS ARE MOVING OVER THE SAME
  AREA OF THE COUNTY, ESPECIALLY THE EASTERN SIDE OF THE COUNTY.

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  NEW BRUNSWICK...PERTH AMBOY...SOMERSET...EDISON...OLD BRIDGE...EAST
  BRUNSWICK...SAYREVILLE...NORTH BRUNSWICK...MIDDLESEX...BOUND
  BROOK...MATAWAN...BROWNVILLE...SOCIETY HILL...NORTH BRUNSWICK
  TOWNSHIP...COLONIA...WOODBRIDGE...SOUTH PLAINFIELD...SOUTH RIVER...
  HIGHLAND PARK AND METUCHEN.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

TURN AROUND...DONT DROWN WHEN ENCOUNTERING FLOODED ROADS. MOST FLOOD
DEATHS OCCUR IN VEHICLES.

&&

LAT...LON 4055 7425 4050 7426 4050 7428 4047 7427
      4045 7423 4040 7425 4034 7434 4044 7451
      4046 7451 4050 7446 4056 7453 4060 7447
      4061 7434 4056 7422

$$
2 follow-up statements
608 
WGUS71 KPHI 312356
FFSPHI

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
756 PM EDT SUN MAY 31 2015

NJC023-010330-
/O.CON.KPHI.FF.W.0004.000000T0000Z-150601T0330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MIDDLESEX NJ-
756 PM EDT SUN MAY 31 2015

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1130 PM EDT FOR
MIDDLESEX COUNTY...

AT 753 PM EDT...TRAINED WEATHER SPOTTERS HAVE REPORTED FLASH 
FLOODING IN CARTERET, OLD BRIDGE, PERTH AMBOY, AND SAYREVILLE. 4 TO 
5 INCHES OF RAIN HAVE FALLEN. FLASH FLOODING IS ALREADY OCCURRING.

SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
NEW BRUNSWICK...PERTH AMBOY...SOMERSET...EDISON...OLD BRIDGE...EAST
BRUNSWICK...SAYREVILLE...NORTH BRUNSWICK...MIDDLESEX...BOUND BROOK...
MATAWAN...BROWNVILLE...SOCIETY HILL...NORTH BRUNSWICK TOWNSHIP...
COLONIA...WOODBRIDGE...SOUTH PLAINFIELD...SOUTH RIVER...HIGHLAND PARK
AND METUCHEN.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

TURN AROUND...DONT DROWN WHEN ENCOUNTERING FLOODED ROADS. MOST FLOOD
DEATHS OCCUR IN VEHICLES.

&&

LAT...LON 4055 7425 4050 7426 4050 7428 4047 7427
      4045 7423 4040 7425 4034 7434 4044 7451
      4046 7451 4050 7446 4056 7453 4060 7447
      4061 7434 4056 7422

$$

MEOLA
227 
WGUS71 KPHI 010232
FFSPHI

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1032 PM EDT SUN MAY 31 2015

NJC023-010330-
/O.CON.KPHI.FF.W.0004.000000T0000Z-150601T0330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MIDDLESEX NJ-
1032 PM EDT SUN MAY 31 2015

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1130 PM EDT FOR
NORTHEASTERN MIDDLESEX COUNTY...

AT 1029 PM EDT...THE HEAVIEST RAIN HAS OCCURRED AND RECESSIONS 
SHOULD BE IN PROGRESS WHERE ROADS WERE CLOSED EARLIER. WHILE SHOWERS 
AND ISOLATED THUNDERSTORMS WILL OCCUR INTERMITTENTLY OVERNIGHT,  AT 
THIS TIME THERE IS NO EXPECTATION FOR AN EXTENSION OF THIS WARNING.  
 
SOME LOCATIONS THAT MAY STILL EXPERIENCE RESIDUAL FLOODING 
INCLUDE... NEW BRUNSWICK...PERTH AMBOY...EDISON...EAST 
BRUNSWICK...SAYREVILLE... MIDDLESEX...BOUND 
BROOK...COLONIA...SOCIETY HILL...NORTH BRUNSWICK 
TOWNSHIP...WOODBRIDGE...SOUTH PLAINFIELD...SOUTH RIVER...HIGHLAND 
PARK...METUCHEN...DUNELLEN...SOUTH BOUND BROOK...FORDS...LAURENCE 
HARBOR AND PORT READING.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TURN AROUND...DONT DROWN WHEN ENCOUNTERING FLOODED ROADS. MOST FLOOD 
DEATHS OCCUR IN VEHICLES AND ITS MORE DANGEROUS AT NIGHT TO DRIVE 
INTO FLOODED ROADS.

&&

LAT...LON 4055 7425 4050 7426 4050 7428 4047 7427
      4045 7423 4042 7427 4042 7431 4045 7436
      4047 7443 4050 7446 4056 7453 4060 7447
      4061 7434 4056 7422

$$

DRAG

The office that day

Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 31, 1:00 PM EDTSevere Thunderstorm WarningPHIHunterdon, Warren45 min
May 31, 1:11 PM EDTFlash Flood WatchPHIHunterdon, Middlesex, Morris, Somerset, Sussex, Warren13 hr
May 31, 1:24 PM EDTSpecial Weather StatementPHIMonmouth36 min
May 31, 2:00 PM EDTSpecial Weather StatementPHIMonmouth45 min
May 31, 4:33 PM EDTSevere Thunderstorm WarningPHIWarren42 min
May 31, 5:57 PM EDTSmall Craft AdvisoryPHI6 hr
May 31, 6:11 PM EDTAreal Flood AdvisoryPHIMiddlesex, Somerset3 hr
May 31, 6:50 PM EDTSevere Thunderstorm WarningPHIMiddlesex, Monmouth40 min
May 31, 7:57 PM EDTAreal Flood AdvisoryPHIHunterdon, Morris, Somerset, Sussex, Warren6 hr

Nearby

Flash Flood Warnings in New Jersey, 2015Every flash flood warning in 2015

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.