Alert archive / New Jersey / Flash Flood Warnings in 2020

Flash Flood Warning 4, NWS Philadelphia/Mount Holly

June 11, 2020Burlington County, Monmouth County, Ocean County, New Jersey

NWS Philadelphia/Mount Holly issued this flash flood warning at Jun 11, 2020, 2:15 PM EDT for Burlington County, Monmouth 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: Jun 11, 2020, 2:15 PM EDT (18:15 UTC)
Expired: Jun 11, 2020, 5:54 PM EDT
In force: 4 hr
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Flood severity: None

Counties Burlington County, NJ, Monmouth County, NJ, Ocean County, NJ

The radar

The Philadelphia radar (KDIX), 36 km from the middle of the area, began a volume at 18:14 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
Jun 11, 2:45 PM EDT	FLASH FLOOD	Leonardo, NJ	FLASH FLOODING ON STATE HIGHWAY 36 NEAR LEONARD AVENUE. ALL LANES CLOSED.
Jun 11, 3:40 PM EDT	FLASH FLOOD	Atlantic Highlands, NJ	WEST HIGHLAND AVENUE CLOSED FROM FLASH 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, 6.3 hours before the alert went out and 135 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 529 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 205 m²/s²
0-3 km storm-relative helicity: 224 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

560 
WGUS51 KPHI 111815
FFWPHI
NJC005-025-029-112215-
/O.NEW.KPHI.FF.W.0004.200611T1815Z-200611T2215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
215 PM EDT Thu Jun 11 2020

The National Weather Service in Mount Holly NJ has issued a

* Flash Flood Warning for...
  Northern Ocean County in southern New Jersey...
  Northeastern Burlington County in southern New Jersey...
  Monmouth County in central New Jersey...

* Until 615 PM EDT.

* At 214 PM EDT, Doppler radar and automated gauges indicated 
  thunderstorms producing heavy rain across the warned area. One to 
  two inches of rain have already fallen. Flash flooding is ongoing 
  or expected to begin shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Radar and automated gauges.

  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, Long Branch, Asbury Park, Sandy Hook, Lakewood,
  Middletown, Jackson, Howell, Marlboro, Manalapan, Tinton Falls,
  Holmdel, Red Bank, Keansburg, Matawan, Manasquan, Highlands, Point
  Pleasant Beach, Presidential Lakes Estates and Lakehurst.

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.

&&

LAT...LON 4012 7397 4007 7403 3982 7450 4006 7474
      4014 7462 4014 7459 4016 7459 4045 7416
      4045 7413 4041 7399 4048 7402 4047 7400
      4043 7397

FLASH FLOOD...RADAR AND GAUGE INDICATED
EXPECTED RAINFALL...ONE INCH IN ONE HOUR

$$

Staarmann

3 follow-up statements

796 
WGUS71 KPHI 112023
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
423 PM EDT Thu Jun 11 2020

NJC005-025-029-112215-
/O.CON.KPHI.FF.W.0004.000000T0000Z-200611T2215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Ocean NJ-Burlington NJ-Monmouth NJ-
423 PM EDT Thu Jun 11 2020

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 615 PM EDT FOR
NORTHERN OCEAN...NORTHEASTERN BURLINGTON AND MONMOUTH COUNTIES...

At 419 PM EDT, law enforcement reported flash flooding and a few 
road closures across central Monmouth County. Up to two inches of 
rain have already fallen. The heaviest rain has moved out of the 
warned area, but some light to moderate rain showers will continue 
for the next couple of hours.

HAZARD...Flash flooding caused by thunderstorms.

SOURCE...Law enforcement.

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, Long Branch, Asbury Park, Sandy Hook, Lakewood,
Middletown, Jackson, Howell, Marlboro, Manalapan, Tinton Falls,
Holmdel, Red Bank, Keansburg, Matawan, Manasquan, Highlands, Point
Pleasant Beach, Presidential Lakes Estates and Lakehurst.

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.

&&

LAT...LON 4012 7397 4007 7403 3982 7450 4006 7474
      4014 7462 4014 7459 4016 7459 4045 7416
      4045 7413 4041 7399 4048 7402 4047 7400
      4043 7397

FLASH FLOOD...OBSERVED

$$

Staarmann

263 
WGUS71 KPHI 112132
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
532 PM EDT Thu Jun 11 2020

NJC005-112141-
/O.CAN.KPHI.FF.W.0004.000000T0000Z-200611T2215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Burlington NJ-
532 PM EDT Thu Jun 11 2020

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

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

LAT...LON 4012 7397 4007 7403 3985 7444 4016 7459
      4045 7416 4042 7402 4041 7400 4041 7399
      4044 7399 4048 7402 4047 7400 4043 7397

$$

NJC025-029-112215-
/O.CON.KPHI.FF.W.0004.000000T0000Z-200611T2215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Ocean NJ-Monmouth NJ-
532 PM EDT Thu Jun 11 2020

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 615 PM EDT FOR
NORTHERN OCEAN AND MONMOUTH COUNTIES...

At 531 PM EDT, law enforcement reported flash flooding and a few 
road closures across central Monmouth County. Up to two inches of 
rain has fallen. The heaviest rain has moved out of the warned area, 
but some lingering flooding remains.

HAZARD...Flash flooding caused by thunderstorms.

SOURCE...Law enforcement.

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, Long Branch, Asbury Park, Sandy Hook, Lakewood,
Middletown, Jackson, Howell, Marlboro, Manalapan, Tinton Falls,
Holmdel, Red Bank, Matawan, Manasquan, Highlands, Point Pleasant
Beach, Lakehurst, Farmingdale and Roosevelt.

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.

&&

LAT...LON 4012 7397 4007 7403 3985 7444 4016 7459
      4045 7416 4042 7402 4041 7400 4041 7399
      4044 7399 4048 7402 4047 7400 4043 7397

FLASH FLOOD...OBSERVED

$$

Staarmann

210 
WGUS71 KPHI 112154
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
554 PM EDT Thu Jun 11 2020

NJC025-029-112204-
/O.CAN.KPHI.FF.W.0004.000000T0000Z-200611T2215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Ocean NJ-Monmouth NJ-
554 PM EDT Thu Jun 11 2020

...THE FLASH FLOOD WARNING FOR NORTHERN OCEAN AND MONMOUTH COUNTIES
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 4012 7397 4007 7403 3985 7444 4016 7459
      4045 7416 4042 7402 4041 7400 4041 7399
      4044 7399 4048 7402 4047 7400 4043 7397

$$

Staarmann

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 11, 3:16 AM EDT	Rip Current Statement	PHI	Atlantic, Cape May, Monmouth, Ocean	18 hr
Jun 11, 1:55 PM EDT	Areal Flood Advisory	PHI	Burlington, Camden, Gloucester	3 hr
Jun 11, 1:59 PM EDT	Areal Flood Advisory	PHI	Mercer, Middlesex, Monmouth, Ocean	4 hr
Jun 11, 3:33 PM EDT	Areal Flood Advisory	PHI	Ocean	3 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.