Alert archive / New Jersey / Flash Flood Warnings in 2018

Flash Flood Warning 36, NWS Philadelphia/Mount Holly

July 17, 2018Ocean County, New Jersey

NWS Philadelphia/Mount Holly issued this flash flood warning at Jul 17, 2018, 4:35 PM EDT for Ocean County, New Jersey. It was in force for 4 hr. 4 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 17, 2018, 4:35 PM EDT (20:35 UTC)
Expired: Jul 17, 2018, 8:30 PM EDT
In force: 4 hr
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Flood severity: None

County Ocean County, NJ

The radar

The Philadelphia radar (KDIX), 29 km from the middle of the area, began a volume at 20:36 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 17, 4:36 PM EDT	FLASH FLOOD	Toms River, NJ	SEVERAL ROADWAYS IMPASSABLE DUE TO HIGH WATER. AN AMBULANCE HAD TO TURN AROUND AND DETOUR IN ROUTE DUE TO FLOODING. TIME ESTIMATED BY RADAR.
Jul 17, 4:46 PM EDT	FLOOD	Point Pleasant, NJ	PHOTO SHOWS SEVERAL CARS IN PARKING LOT IN NEARLY A FOOT OF WATER.
Jul 17, 7:00 PM EDT	HEAVY RAIN 4.55	Brick Twp, NJ
Jul 17, 7:51 PM EDT	HEAVY RAIN 3.06	Manasquan, NJ

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, 8.6 hours before the alert went out and 139 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: 1293 J/kg
Mixed-layer CIN: -63 J/kg
Mixed-layer LCL: 799 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 99 m²/s²
0-3 km storm-relative helicity: 113 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

426 
WGUS51 KPHI 172035
FFWPHI
NJC029-180030-
/O.NEW.KPHI.FF.W.0036.180717T2035Z-180718T0030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
435 PM EDT TUE JUL 17 2018

The National Weather Service in Mount Holly NJ has issued a

* Flash Flood Warning for...
  Northeastern Ocean County in southern New Jersey...

* Until 830 PM EDT.

* At 433 PM EDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Up to two and one-half inches 
  of rain have already fallen. 

* Some locations that could experience flooding include...
  Toms River, Beachwood, Manasquan, Point Pleasant Beach, Seaside
  Heights, Mantoloking, Leisure Village, Dover Beaches North, Holiday
  City South, Pleasant Plains, Leisure Village East, Dover Beaches
  South, Holiday City-Berkeley, Brick Township, Leisure Village
  West-Pine Lake Park, Pine Ridge At Crestwood, Point Pleasant,
  Brielle, South Toms River and Island Heights.

Additional rainfall amounts of one inch is possible in the warned 
area.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 3993 7405 3984 7428 4000 7432 4010 7408
      4011 7405 4010 7404 4011 7404 4012 7402
      4010 7401

$$

Kruzdlo

2 follow-up statements

044 
WGUS71 KPHI 172309
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
709 PM EDT TUE JUL 17 2018

NJC029-180030-
/O.CON.KPHI.FF.W.0036.000000T0000Z-180718T0030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Ocean NJ-
709 PM EDT TUE JUL 17 2018

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 830 PM EDT FOR
NORTHEASTERN OCEAN COUNTY...

At 708 PM EDT, Doppler radar indicated thunderstorms produced heavy 
rain across the warned area. Between 3 and 5 inches of rain fell, 
and Flash Flooding is occurring.

Some locations that could experience flooding include... 
Toms River, Beachwood, Manasquan, Point Pleasant Beach, Seaside 
Heights, Mantoloking, Leisure Village, Dover Beaches North, Holiday 
City South, Pleasant Plains, Leisure Village East, Dover Beaches 
South, Holiday City-Berkeley, Brick Township, Leisure Village 
West-Pine Lake Park, Pine Ridge At Crestwood, Point Pleasant, 
Brielle, South Toms River and Island Heights.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3993 7405 3984 7428 4000 7432 4010 7408
      4011 7405 4010 7404 4011 7404 4012 7402
      4010 7401

$$

MPS

317 
WGUS71 KPHI 180025
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
825 PM EDT TUE JUL 17 2018

NJC029-180035-
/O.EXP.KPHI.FF.W.0036.000000T0000Z-180718T0030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Ocean NJ-
825 PM EDT TUE JUL 17 2018

...THE FLASH FLOOD WARNING FOR NORTHEASTERN OCEAN COUNTY WILL EXPIRE
AT 830 PM EDT...

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

LAT...LON 3993 7405 3984 7428 4000 7432 4010 7408
      4011 7405 4010 7404 4011 7404 4012 7402
      4010 7401

$$

MPS

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 17, 3:36 AM EDT	Flash Flood Watch	PHI	Burlington, Camden, Gloucester, Hunterdon, Mercer, Middlesex and 3 more	15 hr
Jul 17, 12:35 PM EDT	Special Weather Statement	PHI	Sussex	25 min
Jul 17, 1:31 PM EDT	Special Weather Statement	PHI	Hunterdon	44 min
Jul 17, 1:45 PM EDT	Special Weather Statement	PHI	Morris	30 min
Jul 17, 2:05 PM EDT	Areal Flood Advisory	PHI	Hunterdon, Morris, Somerset, Sussex, Warren	3 hr
Jul 17, 2:09 PM EDT	Special Weather Statement	PHI	Morris	36 min
Jul 17, 2:44 PM EDT	Special Weather Statement	PHI	Middlesex	31 min
Jul 17, 2:48 PM EDT	Special Weather Statement	PHI	Mercer	27 min
Jul 17, 2:50 PM EDT	Areal Flood Advisory	PHI	Hunterdon, Mercer, Middlesex, Morris, Somerset	3 hr
Jul 17, 2:58 PM EDT	Severe Thunderstorm Warning	PHI	Mercer	32 min
Jul 17, 3:09 PM EDT	Special Weather Statement	PHI	Monmouth	36 min
Jul 17, 3:48 PM EDT	Special Weather Statement	PHI	Ocean	57 min
Jul 17, 3:51 PM EDT	Special Weather Statement	PHI	Monmouth	24 min
Jul 17, 3:54 PM EDT	Special Marine Warning	PHI		66 min
Jul 17, 3:58 PM EDT	Special Weather Statement	PHI	Ocean	32 min
Jul 17, 4:00 PM EDT	Special Weather Statement	PHI	Cumberland	45 min
Jul 17, 4:03 PM EDT	Areal Flood Advisory	PHI	Burlington, Mercer, Middlesex, Monmouth, Ocean	2 hr
Jul 17, 4:21 PM EDT	Special Marine Warning	PHI		24 min
Jul 17, 4:38 PM EDT	Special Marine Warning	PHI		52 min
Jul 17, 4:48 PM EDT	Special Weather Statement	PHI	Cumberland, Ocean	57 min

Nearby

Flash Flood Warnings in New Jersey, 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.