Alert archive / New Jersey / Flash Flood Warnings in 2016

Flash Flood Warning 16, NWS Philadelphia/Mount Holly

July 8, 20164 counties in New Jersey; Bucks County, Pennsylvania

NWS Philadelphia/Mount Holly issued this flash flood warning at Jul 8, 2016, 5:18 PM EDT for 4 counties in New Jersey; Bucks County, Pennsylvania. It was in force for 4 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 8, 2016, 5:18 PM EDT (21:18 UTC)
Expired: Jul 8, 2016, 9:15 PM EDT
In force: 4 hr
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Flood severity: None

Counties Hunterdon County, NJ, Mercer County, NJ, Middlesex County, NJ, Somerset County, NJ, Bucks County, PA

The radar

The Philadelphia radar (KDIX), 61 km from the middle of the area, began a volume at 21:21 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

Time	Report	Where	Remark
Jul 8, 5:20 PM EDT	HEAVY RAIN 2.58	Readington Twp, NJ	FELL WITHIN ONE HOUR
Jul 8, 5:30 PM EDT	FLASH FLOOD	New Hope, PA	SEVERAL ROADS FLOODED AND CLOSED. ROCKS AND DEBRIS WASHED INTO SOME STREETS.

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, 9.3 hours before the alert went out and 159 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: 387 J/kg
Mixed-layer CIN: -107 J/kg
Mixed-layer LCL: 884 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: -67 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.

764 
WGUS51 KPHI 082118
FFWPHI
NJC019-021-023-035-PAC017-090115-
/O.NEW.KPHI.FF.W.0016.160708T2118Z-160709T0115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
518 PM EDT FRI JUL 8 2016

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ  HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHWESTERN MERCER COUNTY IN CENTRAL NEW JERSEY...
  SOUTHEASTERN HUNTERDON COUNTY IN NORTHWESTERN NEW JERSEY...
  SOUTHERN SOMERSET COUNTY IN NORTHERN NEW JERSEY...
  NORTHWESTERN MIDDLESEX COUNTY IN NORTHERN NEW JERSEY...
  EAST CENTRAL BUCKS COUNTY IN SOUTHEASTERN PENNSYLVANIA...

* UNTIL 915 PM EDT
    
* AT 517 PM EDT...DOPPLER RADAR INDICATED A CLUSTER OF THUNDERSTORMS
  PRODUCING HEAVY RAIN ACROSS THE WARNED AREA. UP TO TWO INCHES OF
  RAIN HAVE ALREADY FALLEN. UP TO FOUR INCHES IS POSSIBLE. 

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  NEW BRUNSWICK...SOMERVILLE...SOMERSET...NORTH BRUNSWICK...
  PRINCETON...MANVILLE...FLEMINGTON...CLINTON...PENNINGTON...
  NEW HOPE...HOPEWELL...ROCKY HILL...STOCKTON...MILLSTONE...
  SAND BROOK...BELLE MEAD...CLOVERHILL...SERGEANTSVILLE...
  KINGSTON AND KENDALL PARK.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

DRIVING INTO FLOOD WATERS COULD PUT YOUR LIFE AT RISK AND COST YOU
THOUSANDS OF DOLLARS IN VEHICLE REPAIRS. FLOOD WATERS MAY BE DEEPER
THAT YOU THINK.  TURN AROUND AND FIND AN ALTERNATE ROUTE.

&&

LAT...LON 4051 7439 4035 7462 4027 7505 4064 7491

$$

KRUZDLO

2 follow-up statements

954 
WGUS71 KPHI 082215
FFSPHI

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
615 PM EDT FRI JUL 8 2016

NJC023-082224-
/O.CAN.KPHI.FF.W.0016.000000T0000Z-160709T0115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MIDDLESEX NJ-
615 PM EDT FRI JUL 8 2016

...THE FLASH FLOOD WARNING FOR NORTHWESTERN MIDDLESEX COUNTY IS
CANCELLED...

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

LAT...LON 4045 7452 4044 7453 4042 7458 4040 7459
      4037 7462 4035 7463 4027 7505 4046 7498
      4053 7482

$$

NJC019-021-035-PAC017-090115-
/O.CON.KPHI.FF.W.0016.000000T0000Z-160709T0115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MERCER NJ-HUNTERDON NJ-SOMERSET NJ-BUCKS PA-
615 PM EDT FRI JUL 8 2016

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 915 PM EDT FOR
NORTHWESTERN MERCER...SOUTHEASTERN HUNTERDON...SOUTHWESTERN SOMERSET
AND EAST CENTRAL BUCKS COUNTIES...

AT 614 PM EDT...DOPPLER RADAR INDICATED THAT THE THUNDERSTORMS WHICH
PRODUCED THE HEAVY RAIN HAVE MOVED OUT OF THE WARNED AREA. UP TO
THREE INCHES OF RAIN HAVE FALLEN. 

THE FLASH FLOODING WARNING WILL REMAIN IN EFFECT UNTIL THE
ASSOCIATED RUNOFF SUBSIDES.

SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
PRINCETON...FLEMINGTON...PENNINGTON...NEW HOPE...HOPEWELL...
ROCKY HILL...STOCKTON...SAND BROOK...SKILLMAN...BELLE MEAD...
CLOVERHILL...SERGEANTSVILLE...KINGSTON...KENDALL PARK...
LAMBERTVILLE AND PRINCETON NORTH.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4045 7452 4044 7453 4042 7458 4040 7459
      4037 7462 4035 7463 4027 7505 4046 7498
      4053 7482

$$

KRUZDLO

731 
WGUS71 KPHI 090033
FFSPHI

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
833 PM EDT FRI JUL 8 2016

NJC019-021-035-PAC017-090042-
/O.CAN.KPHI.FF.W.0016.000000T0000Z-160709T0115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MERCER NJ-HUNTERDON NJ-SOMERSET NJ-BUCKS PA-
833 PM EDT FRI JUL 8 2016

...THE FLASH FLOOD WARNING FOR NORTHWESTERN MERCER...SOUTHEASTERN
HUNTERDON...SOUTHWESTERN SOMERSET AND EAST CENTRAL BUCKS COUNTIES IS
CANCELLED...

THE HEAVY RAIN HAS ENDED AND NO NEW FLOODING IS EXPECTED. THE
REAVILLE STREAM GAUGE ON THE NESHANIC WAS RISING THE LAST COUPLE
HOURS. IT RECENTLY CRESTED ABOUT ONE-HALF FEET UNDER FLOOD STAGE.

LAT...LON 4045 7452 4044 7453 4042 7458 4040 7459
      4037 7462 4035 7463 4027 7505 4046 7498
      4053 7482

$$

KRUZDLO

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 8, 1:30 PM EDT	Special Weather Statement	PHI	Camden, Gloucester, Hunterdon, Salem, Warren	3 hr
Jul 8, 2:30 PM EDT	Areal Flood Advisory	PHI	Burlington, Camden	4 hr
Jul 8, 2:46 PM EDT	Areal Flood Advisory	PHI	Morris	4 hr
Jul 8, 3:08 PM EDT	Special Weather Statement	PHI	Morris	37 min
Jul 8, 3:12 PM EDT	Areal Flood Advisory	PHI	Morris, Sussex, Warren	4 hr
Jul 8, 3:25 PM EDT	Special Weather Statement	PHI	Burlington	35 min
Jul 8, 3:32 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Camden	43 min
Jul 8, 3:42 PM EDT	Special Weather Statement	PHI	Morris	33 min
Jul 8, 3:43 PM EDT	Areal Flood Advisory	PHI	Warren	4 hr
Jul 8, 3:45 PM EDT	Severe Thunderstorm Warning	PHI	Morris, Somerset	45 min
Jul 8, 4:08 PM EDT	Areal Flood Advisory	PHI	Atlantic, Burlington	4 hr
Jul 8, 4:10 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington	50 min
Jul 8, 4:25 PM EDT	Areal Flood Advisory	PHI	Hunterdon, Mercer, Middlesex, Morris, Somerset, Warren	4 hr
Jul 8, 4:29 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Middlesex, Morris, Somerset, Warren	46 min
Jul 8, 4:56 PM EDT	Flash Flood Warning	PHI	Hunterdon, Middlesex, Morris, Somerset, Warren	4 hr
Jul 8, 4:59 PM EDT	Special Weather Statement	PHI	Atlantic	46 min
Jul 8, 5:12 PM EDT	Special Weather Statement	PHI	Hunterdon, Mercer, Somerset	48 min
Jul 8, 5:25 PM EDT	Special Weather Statement	PHI	Morris	50 min
Jul 8, 5:28 PM EDT	Areal Flood Advisory	PHI	Atlantic	4 hr
Jul 8, 5:48 PM EDT	Areal Flood Advisory	PHI	Burlington, Mercer, Middlesex, Monmouth	4 hr
Jul 8, 5:54 PM EDT	Special Weather Statement	PHI	Mercer	36 min
Jul 8, 6:22 PM EDT	Special Weather Statement	PHI	Burlington, Camden	23 min
Jul 8, 6:36 PM EDT	Areal Flood Advisory	PHI	Burlington, Camden	4 hr
Jul 8, 7:29 PM EDT	Special Weather Statement	PHI	Atlantic	31 min
Jul 8, 7:38 PM EDT	Areal Flood Advisory	PHI	Atlantic, Burlington, Camden	4 hr
Jul 8, 7:48 PM EDT	Flash Flood Warning	PHI	Atlantic, Burlington, Camden	4 hr
Jul 8, 12:33 PM EDT	Areal Flood Advisory	PHI	Monroe	3 hr
Jul 8, 3:31 PM EDT	Areal Flood Advisory	PHI	Carbon, Monroe	4 hr

Nearby

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