Alert archive / New Jersey / Flash Flood Warnings in 2020

Flash Flood Warning 19, NWS Philadelphia/Mount Holly

July 10, 2020Atlantic County, Burlington County, Ocean County, New Jersey

NWS Philadelphia/Mount Holly issued this flash flood warning at Jul 10, 2020, 10:31 AM EDT for Atlantic County, Burlington County, Ocean County, New Jersey. 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 10, 2020, 10:31 AM EDT (14:31 UTC)
Expired: Jul 10, 2020, 2:30 PM EDT
In force: 4 hr
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Flood severity: None

Counties Atlantic County, NJ, Burlington County, NJ, Ocean County, NJ

The radar

The Philadelphia radar (KDIX), 17 km from the middle of the area, began a volume at 14:35 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 10, 12:38 PM EDT	FLASH FLOOD	4 Sw Leisure Village Ea, NJ	FLASH FLOODING CLOSED U.S. HIGHWAY 9 SOUTH OF CHURCH ROAD IN TOMS RIVER TWP. TIME BASED ON INITIAL DOT REPORT.
Jul 10, 12:43 PM EDT	FLASH FLOOD	Seaside Heights, NJ	MEDIA RELAYS REPORT OF FLOODING ON HIERING AVENUE IN SEASIDE HEIGHTS.

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, 2.5 hours before the alert went out and 163 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: 531 J/kg
Mixed-layer CIN: -3 J/kg
Mixed-layer LCL: 508 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: 50 m²/s²
0-3 km storm-relative helicity: 88 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

370 
WGUS51 KPHI 101431
FFWPHI
NJC001-005-029-101830-
/O.NEW.KPHI.FF.W.0019.200710T1431Z-200710T1830Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
1031 AM EDT Fri Jul 10 2020

The National Weather Service in Mount Holly NJ has issued a

* Flash Flood Warning for...
  East central Atlantic County in southern New Jersey...
  Ocean County in southern New Jersey...
  Southeastern Burlington County in southern New Jersey...

* Until 230 PM EDT.

* At 1030 AM EDT, Doppler radar indicated heavy rain falling across
  the warned area. Up to one inch of rain has already fallen.

  HAZARD...Flash flooding caused by heavy rain.

  SOURCE...Radar indicated.

  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 could experience flooding include...
  Toms River, Lakewood, Jackson, Barnegat, Beachwood, Egg Harbor
  City, Tuckerton, Seaside Heights, Lakehurst, Surf City, Port
  Republic, Mantoloking, Leisure Village, Wading River, Dover Beaches
  North, Holiday City South, Pleasant Plains, Warren Grove, Cedar
  Glen West and Leisure Village East.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Protecting yourself from immediate threats to life and safety shall
take priority.  Whenever possible, as long as it does not cause
greater harm, all COVID-19 protective action guidance should be
followed.

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

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 4012 7434 4007 7401 3977 7406 3948 7421
      3955 7459

FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL...1-3 INCHES IN 1 HOUR

$$

Kruzdlo

1 follow-up statement

386 
WGUS71 KPHI 101824
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
224 PM EDT Fri Jul 10 2020

NJC001-005-029-101830-
/O.EXP.KPHI.FF.W.0019.000000T0000Z-200710T1830Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Atlantic NJ-Ocean NJ-Burlington NJ-
224 PM EDT Fri Jul 10 2020

...THE FLASH FLOOD WARNING FOR EAST CENTRAL ATLANTIC...OCEAN AND
SOUTHEASTERN BURLINGTON COUNTIES WILL EXPIRE AT 230 PM EDT...

The heavy rain that caused the rapid rise in water earlier today has 
ended. Flash flooding is no longer expected to pose a threat, but 
higher tides may cause standing water through the afternoon.

LAT...LON 4012 7434 4007 7401 3977 7406 3948 7421
      3955 7459

$$

Kruzdlo

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 10, 6:48 AM EDT	Special Marine Warning	PHI		57 min
Jul 10, 7:11 AM EDT	Special Marine Warning	PHI		94 min
Jul 10, 7:42 AM EDT	Special Marine Warning	PHI		33 min
Jul 10, 8:20 AM EDT	Flash Flood Warning Considerable damage threat	PHI	Cape May	4 hr
Jul 10, 8:34 AM EDT	Special Marine Warning	PHI		30 min
Jul 10, 9:01 AM EDT	Flash Flood Warning	PHI	Atlantic, Cape May	3 hr
Jul 10, 9:13 AM EDT	Special Marine Warning	PHI		21 min
Jul 10, 9:27 AM EDT	Areal Flood Advisory	PHI	Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 1 more	4 hr
Jul 10, 10:35 AM EDT	Areal Flood Advisory	PHI	Atlantic, Burlington, Camden, Gloucester, Ocean	4 hr
Jul 10, 11:02 AM EDT	Areal Flood Advisory	PHI	Camden, Gloucester, Salem	4 hr
Jul 10, 11:08 AM EDT	Areal Flood Advisory	PHI	Burlington, Camden, Gloucester, Mercer, Monmouth, Ocean	4 hr
Jul 10, 12:35 PM EDT	Areal Flood Advisory	PHI	Mercer, Middlesex, Monmouth, Ocean, Somerset	3 hr
Jul 10, 12:49 PM EDT	Flash Flood Warning	PHI	Mercer, Middlesex, Monmouth, Ocean, Somerset	4 hr
Jul 10, 12:56 PM EDT	Flash Flood Warning	PHI	Burlington, Camden, Cumberland, Gloucester, Salem	4 hr
Jul 10, 1:15 PM EDT	Flash Flood Warning	PHI	Middlesex, Monmouth, Somerset	4 hr
Jul 10, 1:41 PM EDT	Areal Flood Advisory	PHI	Hunterdon, Mercer, Somerset	4 hr
Jul 10, 2:08 PM EDT	Areal Flood Advisory	PHI	Morris, Somerset	4 hr
Jul 10, 3:12 PM EDT	Areal Flood Advisory	PHI	Sussex, Warren	4 hr
Jul 10, 4:30 PM EDT	Areal Flood Advisory	PHI	Hunterdon, Mercer, Middlesex, Monmouth, Ocean	4 hr
Jul 10, 4:48 PM EDT	Areal Flood Warning	PHI	Burlington, Camden, Cumberland, Gloucester, Salem	4 hr
Jul 10, 5:39 PM EDT	Areal Flood Advisory	PHI	Hunterdon, Mercer, Somerset	4 hr

Nearby

Flash Flood Warnings in New Jersey, 2020 Every flash flood warning in 2020

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.