Alert archive / New Jersey / Flash Flood Warnings in 2023

Flash Flood Warning 2, NWS Philadelphia/Mount Holly

April 15, 2023Burlington County, Camden County, New Jersey

NWS Philadelphia/Mount Holly issued this flash flood warning at Apr 15, 2023, 4:19 PM EDT for Burlington County, Camden County, New Jersey. It was in force for 3 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: Apr 15, 2023, 4:19 PM EDT (20:19 UTC)
Expired: Apr 15, 2023, 7:37 PM EDT
In force: 3 hr
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Flood severity: None

Counties Burlington County, NJ, Camden County, NJ

The radar

The Philadelphia radar (KDIX), 40 km from the middle of the area, began a volume at 20:20 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
Apr 15, 4:30 PM EDT	FLASH FLOOD	2 Nne Mount Laurel, NJ	LARCHMONT BOULEVARD CLOSED AT WILLOW TURN DUE TO FLOODING. A VEHICLE WAS STRANDED AND THERE WAS 2 TO 3 FEET OF WATER ON THE ROADWAY.
Apr 15, 4:40 PM EDT	HEAVY RAIN 1.9	1 Wnw South Jersey Regi, NJ	UPDATES PREVIOUS HEAVY RAIN REPORT FROM 1 WNW SOUTH JERSEY REGIONAL AIRPORT: 1.9 INCHES OF RAIN FELL IN ABOUT 50 MINUTES. MOUNT LAUREL TOWNSHIP.
Apr 15, 5:30 PM EDT	FLASH FLOOD	1 Sw Hainesport, NJ	LANES BLOCKED ON CREEK ROAD NEAR ROUTE 38 DUE TO FLOODING.

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, 8.3 hours before the alert went out and 203 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: 26 J/kg
Mixed-layer CIN: -187 J/kg
Mixed-layer LCL: 927 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: -16 m²/s²
0-3 km storm-relative helicity: 26 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.0

Open this sounding in Storm Lab

The text

As transmitted.

863 
WGUS51 KPHI 152019
FFWPHI
NJC005-007-160030-
/O.NEW.KPHI.FF.W.0002.230415T2019Z-230416T0030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
419 PM EDT Sat Apr 15 2023

The National Weather Service in Mount Holly has issued a

* Flash Flood Warning for...
  Northwestern Burlington County in southern New Jersey...
  Central Camden County in southern New Jersey...

* Until 830 PM EDT.

* At 419 PM EDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1.5 and 2 inches of 
  rain have fallen. Additional rainfall amounts of 1 to 2 inches are 
  possible in the warned area. Flash flooding is ongoing or expected 
  to begin shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Radar.

  IMPACT...Flooding of small creeks and streams, urban areas,
           highways, streets, and underpasses as well as other
           drainage and low lying areas.

* Some locations that may experience flash flooding include...
  Evesham, Mount Laurel, Willingboro, Voorhees, Medford, Lindenwold, 
  Lumberton, Mount Holly, Berlin, Chesilhurst, Marlton Lakes, and 
  Marlton.

This includes the following highways...
	New Jersey Turnpike between exits 4 and 5.
	Interstate 295 in New Jersey between mile markers 38 and 50.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Motorists should not attempt to drive around barricades or drive 
cars through flooded areas.

&&

LAT...LON 3992 7496 4003 7495 4008 7480 3989 7473
      3976 7474 3966 7484 3971 7496

FLASH FLOOD...RADAR INDICATED

$$

Fitzsimmons

1 follow-up statement

139 
WGUS71 KPHI 152337
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
737 PM EDT Sat Apr 15 2023

NJC005-007-152347-
/O.CAN.KPHI.FF.W.0002.000000T0000Z-230416T0030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Burlington NJ-Camden NJ-
737 PM EDT Sat Apr 15 2023

...FLASH FLOOD WARNING IS CANCELLED FOR NORTHWESTERN BURLINGTON AND 
CENTRAL CAMDEN COUNTIES...

The heavy rain has ended. Flooding is no longer expected to pose a 
threat.

LAT...LON 3992 7496 4003 7495 4008 7480 3989 7473
      3976 7474 3966 7484 3971 7496

$$

Iovino

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 15, 4:29 AM EDT	Marine Dense Fog Advisory	PHI		54 hr
Apr 15, 1:09 PM EDT	Special Weather Statement	PHI	Sussex	36 min
Apr 15, 1:34 PM EDT	Severe Thunderstorm Warning	PHI	Warren	26 min
Apr 15, 1:49 PM EDT	Severe Thunderstorm Warning	PHI	Sussex	26 min
Apr 15, 1:55 PM EDT	Areal Flood Advisory	PHI	Sussex	6 hr
Apr 15, 1:58 PM EDT	Severe Thunderstorm Warning	PHI	Warren	32 min
Apr 15, 2:06 PM EDT	Areal Flood Advisory	PHI	Mercer, Middlesex, Somerset	6 hr
Apr 15, 3:28 PM EDT	Areal Flood Advisory	PHI	Hunterdon, Morris, Sussex, Warren	3 hr
Apr 15, 3:29 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Camden, Gloucester	31 min
Apr 15, 3:58 PM EDT	Areal Flood Advisory	PHI	Burlington, Camden, Gloucester	3 hr
Apr 15, 4:05 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Mercer	25 min
Apr 15, 4:49 PM EDT	Severe Thunderstorm Warning	PHI	Mercer, Middlesex, Somerset	26 min
Apr 15, 4:56 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon	14 min
Apr 15, 6:05 PM EDT	Areal Flood Advisory	PHI	Hunterdon, Mercer, Somerset	96 min
Apr 15, 6:32 PM EDT	Areal Flood Warning	PHI	Hunterdon	5 hr

Nearby

Flash Flood Warnings in New Jersey, 2023 Every flash flood warning in 2023

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.