Alert archive / New Jersey / Flash Flood Warnings in 2018

Flash Flood Warning 100, NWS Philadelphia/Mount Holly

September 18, 2018Atlantic County, New Jersey

NWS Philadelphia/Mount Holly issued this flash flood warning at Sep 18, 2018, 5:17 PM EDT for Atlantic County, New Jersey. It was in force for 113 min. 1 report 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: Sep 18, 2018, 5:17 PM EDT (21:17 UTC)
Expired: Sep 18, 2018, 7:10 PM EDT
In force: 113 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Flood severity: None

County Atlantic County, NJ

The radar

The Philadelphia radar (KDIX), 61 km from the middle of the area, began a volume at 21:19 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
Sep 18, 5:35 PM EDT	FLOOD	3 E Mays Landing, NJ	FLOODING ON US 322. LEFT TURN LANE WAS CLOSED

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Wallops Is Stn, VA (KWAL), launched 12:00Z, 9.3 hours before the alert went out and 183 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: 1379 J/kg
Mixed-layer CIN: -1 J/kg
Mixed-layer LCL: 596 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 81 m²/s²
0-3 km storm-relative helicity: 106 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

423 
WGUS51 KPHI 182117
FFWPHI
NJC001-190015-
/O.NEW.KPHI.FF.W.0100.180918T2117Z-180919T0015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
517 PM EDT TUE SEP 18 2018

The National Weather Service in Mount Holly NJ has issued a

* Flash Flood Warning for...
  Southeastern Atlantic County in southern New Jersey...

* Until 815 PM EDT.

* At 517 PM EDT, Doppler radar indicated thunderstorms producing
  heavy rain across the warned area. Up to two inches of rain have
  already fallen. Flash flooding is expected to begin shortly in the
  areas of heaviest rain.

* Some locations that could experience flooding include...
  Atlantic City, Ocean City, Pleasantville, Somers Point, Ventnor
  City, Brigantine, Northfield, Absecon, Margate City, Port Republic,
  Longport, Pomona, Mays Landing and Linwood.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3942 7430 3925 7454 3927 7457 3929 7455
      3928 7459 3929 7459 3944 7475 3956 7451
      3952 7435 3950 7434 3952 7434 3949 7425

$$

SFJ

2 follow-up statements

623 
WGUS71 KPHI 182206
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
606 PM EDT TUE SEP 18 2018

NJC001-190015-
/O.CON.KPHI.FF.W.0100.000000T0000Z-180919T0015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Atlantic NJ-
606 PM EDT TUE SEP 18 2018

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 815 PM EDT FOR
SOUTHEASTERN ATLANTIC COUNTY...

At 605 PM EDT, Doppler radar and automated rain gauges indicated
thunderstorms producing heavy rain over the warned area. Up to two
inches of rain have already fallen. Flash flooding is expected to 
begin shortly. Although the heaviest rain has moved out of the 
area, additional light rain could exacerbate ongoing flooding issues.

Some locations that could experience flooding include...
Atlantic City, Ocean City, Pleasantville, Somers Point, Ventnor City,
Brigantine, Northfield, Absecon, Margate City, Port Republic,
Longport, Pomona, Mays Landing and Linwood.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3942 7430 3925 7454 3927 7457 3929 7455
      3928 7459 3929 7459 3944 7475 3956 7451
      3952 7435 3950 7434 3952 7434 3949 7425

$$

SFJ

868 
WGUS71 KPHI 182310
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
710 PM EDT TUE SEP 18 2018

NJC001-182320-
/O.CAN.KPHI.FF.W.0100.000000T0000Z-180919T0015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Atlantic NJ-
710 PM EDT TUE SEP 18 2018

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

The heavy rain has ended. Flooding is no longer expected to pose a
threat. Please continue to heed any remaining road closures.

LAT...LON 3942 7430 3925 7454 3927 7457 3929 7455
      3928 7459 3929 7459 3944 7475 3956 7451
      3952 7435 3950 7434 3952 7434 3949 7425

$$

SFJ

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 18, 4:13 AM EDT	Special Weather Statement	PHI	Camden, Gloucester, Salem	92 min
Sep 18, 9:27 AM EDT	Flash Flood Watch	PHI	Burlington, Camden, Gloucester, Hunterdon, Mercer, Middlesex and 5 more	6 hr
Sep 18, 10:59 AM EDT	Areal Flood Advisory	PHI	Hunterdon, Mercer, Middlesex, Monmouth, Somerset	4 hr
Sep 18, 12:01 PM EDT	Flash Flood Warning	PHI	Mercer, Middlesex, Somerset	4 hr
Sep 18, 12:16 PM EDT	Special Weather Statement	PHI	Middlesex	29 min
Sep 18, 12:36 PM EDT	Areal Flood Advisory	PHI	Burlington, Camden, Gloucester, Mercer, Middlesex, Monmouth and 2 more	3 hr
Sep 18, 1:20 PM EDT	Special Weather Statement	PHI	Burlington	25 min
Sep 18, 1:35 PM EDT	Special Marine Warning	PHI		55 min
Sep 18, 2:51 PM EDT	Special Marine Warning	PHI		38 min
Sep 18, 2:55 PM EDT	Special Weather Statement	PHI	Ocean	35 min
Sep 18, 3:02 PM EDT	Areal Flood Advisory	PHI	Burlington, Ocean	3 hr
Sep 18, 3:12 PM EDT	Areal Flood Advisory	PHI	Atlantic, Burlington, Camden, Ocean	47 min
Sep 18, 3:47 PM EDT	Special Weather Statement	PHI	Ocean	28 min
Sep 18, 4:12 PM EDT	Special Weather Statement	PHI	Atlantic	33 min
Sep 18, 4:47 PM EDT	Areal Flood Advisory	PHI	Atlantic, Cape May, Cumberland, Ocean	2 hr

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.