Alert archive / New Jersey / Flash Flood Warnings in 2018

Flash Flood Warning 31, NWS Philadelphia/Mount Holly

July 6, 20184 counties in New Jersey; Bucks County, Philadelphia County, Pennsylvania

NWS Philadelphia/Mount Holly issued this flash flood warning at Jul 6, 2018, 7:01 AM EDT for 4 counties in New Jersey; Bucks County, Philadelphia County, Pennsylvania. It was in force for 4 hr. 3 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 6, 2018, 7:01 AM EDT (11:01 UTC)
Expired: Jul 6, 2018, 11:00 AM EDT
In force: 4 hr
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Flood severity: None

Counties Burlington County, NJ, Mercer County, NJ, Middlesex County, NJ, Monmouth County, NJ, Bucks County, PA, Philadelphia County, PA

The radar

The Philadelphia radar (KDIX), 40 km from the middle of the area, began a volume at 11:05 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 6, 7:38 AM EDT	FLOOD	1 Se Hillside Terrace, NJ	FLOODING ON I-195 WESTBOUND RAMP FROM EXIT 7 TO COUNTY ROAD 526. RAMP CLOSED AND TRAFFIC DETOURED. TIME ESTIMATED FROM RADAR.
Jul 6, 8:44 AM EDT	FLOOD	Georgetown, NJ	FLOODING ON STATE HIGHWAY 68 NEAR SCHOOL HOUSE ROAD IN MANSFIELD TWP. LANE CLOSURES IN PLACE.
Jul 6, 8:57 AM EDT	FLOOD	1 Ssw Trenton, NJ	FLOODING ON U.S. HIGHWAY 1 NEAR SOUTH BROAD STREET. LANE CLOSURES IN PLACE.

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, 11.0 hours before the alert went out and 181 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: 914 J/kg
Mixed-layer CIN: -46 J/kg
Mixed-layer LCL: 809 m above ground
0-6 km bulk shear: 11 kt
0-1 km storm-relative helicity: -2 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.

371 
WGUS51 KPHI 061101
FFWPHI
NJC005-021-023-025-PAC017-101-061500-
/O.NEW.KPHI.FF.W.0031.180706T1101Z-180706T1500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
701 AM EDT FRI JUL 6 2018

The National Weather Service in Mount Holly NJ has issued a

* Flash Flood Warning for...
  Mercer County in central New Jersey...
  Northwestern Burlington County in southern New Jersey...
  Southwestern Middlesex County in northern New Jersey...
  Southwestern Monmouth County in central New Jersey...
  Southeastern Bucks County in southeastern Pennsylvania...
  Northeastern Philadelphia County in southeastern Pennsylvania...

* Until 1100 AM EDT.

* At 700 AM EDT, Doppler radar indicated thunderstorms producing
  heavy rain across the warned area. Up to two inches of rain have 
  already fallen in spots. Flash flooding is expected to begin 
  shortly in the areas of heaviest rain.

* Some locations that could experience flooding include...
  Philadelphia, Trenton, Bensalem, East Brunswick, South Brunswick,
  Ewing, Princeton, Florence, Burlington, Bristol, Riverside,
  Hatboro, Hightstown, Bordentown, Cranbury, Pennington, Beverly,
  Yardley, Newtown and Tullytown.

Additional rainfall amounts of an inch or two are possible in the 
warned area.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around...don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.

&&

LAT...LON 4012 7449 4008 7455 4006 7454 4002 7501
      4011 7506 4014 7502 4019 7511 4020 7511
      4031 7489 4042 7446

$$

Iovino

4 follow-up statements

652 
WGUS71 KPHI 061152
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
752 AM EDT FRI JUL 6 2018

NJC005-021-023-025-PAC017-101-061500-
/O.CON.KPHI.FF.W.0031.000000T0000Z-180706T1500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Mercer NJ-Burlington NJ-Middlesex NJ-Monmouth NJ-Bucks PA-
Philadelphia PA-
752 AM EDT FRI JUL 6 2018

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1100 AM EDT FOR
MERCER...NORTHWESTERN BURLINGTON...SOUTHWESTERN MIDDLESEX...
SOUTHWESTERN MONMOUTH...SOUTHEASTERN BUCKS AND NORTHEASTERN
PHILADELPHIA COUNTIES...

At 749 AM EDT, Doppler radar and automated rain gauges indicated 
heavy rainfall from thunderstorms have occurred over much of the 
warned area. Up to three inches of rain have already fallen near 
Levittown, and street flooding has occurred in portions of Bucks and 
Mercer Counties. A rapid rise is currently occurring on Assunpink 
Creek near Trenton. Flash flooding is imminent or occurring.

Some locations that could experience flooding include...
Philadelphia, Trenton, Bensalem, East Brunswick, South Brunswick,
Ewing, Princeton, Florence, Burlington, Bristol, Riverside, Hatboro,
Hightstown, Bordentown, Cranbury, Pennington, Beverly, Yardley,
Newtown and Tullytown.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around...don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.

Please report flooding to your local law enforcement agency when you
can do so safely.

&&

LAT...LON 4012 7449 4008 7455 4006 7454 4002 7501
      4011 7506 4014 7502 4019 7511 4020 7511
      4031 7489 4042 7446

$$

CMS

615 
WGUS71 KPHI 061248
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
848 AM EDT FRI JUL 6 2018

PAC101-061255-
/O.CAN.KPHI.FF.W.0031.000000T0000Z-180706T1500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Philadelphia PA-
848 AM EDT FRI JUL 6 2018

...THE FLASH FLOOD WARNING FOR NORTHEASTERN PHILADELPHIA COUNTY IS
CANCELLED...

Flooding is no longer expected to pose a threat. Please continue to
heed any remaining road closures.

LAT...LON 4012 7449 4008 7455 4006 7454 4002 7501
      4005 7498 4006 7498 4008 7496 4012 7496
      4018 7509 4020 7511 4031 7489 4042 7446

$$

NJC005-021-023-025-PAC017-061500-
/O.CON.KPHI.FF.W.0031.000000T0000Z-180706T1500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Mercer NJ-Burlington NJ-Middlesex NJ-Monmouth NJ-Bucks PA-
848 AM EDT FRI JUL 6 2018

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1100 AM EDT FOR
MERCER...NORTHWESTERN BURLINGTON...SOUTHWESTERN MIDDLESEX...
SOUTHWESTERN MONMOUTH AND SOUTHEASTERN BUCKS COUNTIES...

At 845 AM EDT, local law enforcement reported that the westbound 
ramp to Interstate 195 at Exit 7 is closed from flooding in Mercer 
County. Up to three inches of rain have already fallen. Flash 
flooding remains a threat, even though the heaviest rainfall has 
ended for the time being.

Some locations that could experience flooding include...
Trenton, Bensalem, East Brunswick, South Brunswick, Ewing, Princeton,
Florence, Burlington, Bristol, Riverside, Hatboro, Hightstown,
Bordentown, Cranbury, Pennington, Beverly, Yardley, Newtown,
Tullytown and Allentown.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around...don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.

Please report flooding to your local law enforcement agency when you
can do so safely.

&&

LAT...LON 4012 7449 4008 7455 4006 7454 4002 7501
      4005 7498 4006 7498 4008 7496 4012 7496
      4018 7509 4020 7511 4031 7489 4042 7446

$$

CMS

066 
WGUS71 KPHI 061330
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
930 AM EDT FRI JUL 6 2018

PAC017-061339-
/O.CAN.KPHI.FF.W.0031.000000T0000Z-180706T1500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Bucks PA-
930 AM EDT FRI JUL 6 2018

...THE FLASH FLOOD WARNING FOR SOUTHEASTERN BUCKS COUNTY IS
CANCELLED...

Flash flooding is no longer expected to pose a threat. Please 
continue to heed any remaining road closures.

LAT...LON 4012 7449 4008 7455 4006 7454 4002 7501
      4007 7494 4008 7487 4013 7482 4012 7478
      4015 7472 4022 7477 4025 7484 4031 7489
      4042 7446

$$

NJC005-021-023-025-061500-
/O.CON.KPHI.FF.W.0031.000000T0000Z-180706T1500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Mercer NJ-Burlington NJ-Middlesex NJ-Monmouth NJ-
930 AM EDT FRI JUL 6 2018

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1100 AM EDT FOR
MERCER...NORTHWESTERN BURLINGTON...SOUTHWESTERN MIDDLESEX AND
SOUTHWESTERN MONMOUTH COUNTIES...

At 929 AM EDT, local law enforcement reported flooding in several 
areas in Mercer County from earlier heavy rainfall. Up to three 
inches of rain have already fallen. Flash flooding is already 
occurring.

Some locations that could experience flooding include...
Trenton, East Brunswick, South Brunswick, Ewing, Princeton, Florence,
Burlington, Bristol, Riverside, Hightstown, Bordentown, Cranbury,
Pennington, Beverly, Tullytown, Allentown, Roosevelt, Washington
Crossing, Princeton Meadows and Windsor.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around...don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.

Please report flooding to your local law enforcement agency when you
can do so safely.

&&

LAT...LON 4012 7449 4008 7455 4006 7454 4002 7501
      4007 7494 4008 7487 4013 7482 4012 7478
      4015 7472 4022 7477 4025 7484 4031 7489
      4042 7446

$$

CMS

711 
WGUS71 KPHI 061452
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
1052 AM EDT FRI JUL 6 2018

NJC005-021-023-025-061500-
/O.EXP.KPHI.FF.W.0031.000000T0000Z-180706T1500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Mercer NJ-Burlington NJ-Middlesex NJ-Monmouth NJ-
1052 AM EDT FRI JUL 6 2018

...THE FLASH FLOOD WARNING FOR MERCER...NORTHWESTERN BURLINGTON...
SOUTHWESTERN MIDDLESEX AND SOUTHWESTERN MONMOUTH COUNTIES WILL EXPIRE
AT 1100 AM EDT...

Flood waters have receded. Flooding is no longer expected to pose a
threat. Please continue to heed any remaining road closures.

More showers and thunderstorms may occur later today. A flash flood 
watch remains in effect.

LAT...LON 4012 7449 4008 7455 4006 7454 4002 7501
      4007 7494 4008 7487 4013 7482 4012 7478
      4015 7472 4022 7477 4025 7484 4031 7489
      4042 7446

$$

CMS

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 6, 3:25 AM EDT	Small Craft Advisory	PHI		60 hr
Jul 6, 4:39 AM EDT	Areal Flood Advisory	PHI	Hunterdon, Mercer, Middlesex, Morris, Somerset	4 hr
Jul 6, 5:37 AM EDT	Areal Flood Advisory	PHI	Burlington, Camden, Gloucester, Mercer, Monmouth, Ocean	4 hr
Jul 6, 6:40 AM EDT	Areal Flood Advisory	PHI	Monmouth, Ocean	4 hr
Jul 6, 7:13 AM EDT	Special Weather Statement	PHI	Burlington, Ocean	32 min
Jul 6, 7:19 AM EDT	Special Weather Statement	PHI	Mercer, Middlesex	26 min
Jul 6, 7:38 AM EDT	Special Weather Statement	PHI	Ocean	52 min
Jul 6, 7:50 AM EDT	Special Weather Statement	PHI	Monmouth	25 min
Jul 6, 7:52 AM EDT	Special Weather Statement	PHI	Atlantic	23 min
Jul 6, 8:13 AM EDT	Special Weather Statement	PHI	Atlantic	47 min
Jul 6, 8:23 AM EDT	Flash Flood Warning	PHI	Burlington, Monmouth, Ocean	4 hr
Jul 6, 9:03 AM EDT	Special Weather Statement	PHI	Atlantic	27 min
Jul 6, 9:06 AM EDT	Special Marine Warning	PHI		54 min
Jul 6, 9:24 AM EDT	Areal Flood Advisory	PHI	Burlington, Camden	2 hr
Jul 6, 9:25 AM EDT	Special Weather Statement	PHI	Atlantic	20 min
Jul 6, 9:50 AM EDT	Special Marine Warning	PHI		40 min
Jul 6, 10:40 AM EDT	Special Marine Warning	PHI		65 min
Jul 6, 11:39 AM EDT	Special Marine Warning	PHI		66 min
Jul 6, 12:30 PM EDT	Special Weather Statement	PHI	Ocean	30 min
Jul 6, 12:42 PM EDT	Special Weather Statement	PHI	Atlantic	33 min
Jul 6, 12:46 PM EDT	Special Marine Warning	PHI		59 min
Jul 6, 12:59 PM EDT	Areal Flood Advisory	PHI	Atlantic, Burlington, Cape May, Ocean	3 hr
Jul 6, 12:59 PM EDT	Special Weather Statement	PHI	Ocean	46 min
Jul 6, 1:01 PM EDT	Special Marine Warning	PHI		59 min
Jul 6, 1:07 PM EDT	Special Weather Statement	PHI	Atlantic	23 min
Jul 6, 1:24 PM EDT	Areal Flood Advisory	PHI	Ocean	2 hr
Jul 6, 1:35 PM EDT	Special Weather Statement	PHI	Atlantic	40 min
Jul 6, 1:43 PM EDT	Special Marine Warning	PHI		62 min
Jul 6, 3:48 PM EDT	Small Craft Advisory	PHI		32 hr
Jul 6, 3:06 AM EDT	Special Weather Statement	PHI	Berks	54 min
Jul 6, 3:46 AM EDT	Areal Flood Advisory	PHI	Berks, Bucks, Chester, Montgomery	5 hr

Nearby

Flash Flood Warnings in New Jersey, 2018 Flash Flood Warnings in Pennsylvania, 2018 Every flash flood warning in 2018

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.