Alert archive / New Jersey / Flash Flood Warnings in 2020

Flash Flood Warning 12, NWS Philadelphia/Mount Holly

July 6, 2020Middlesex County, Morris County, Somerset County, New Jersey

NWS Philadelphia/Mount Holly issued this flash flood warning at Jul 6, 2020, 3:47 PM EDT for Middlesex County, Morris County, Somerset County, New Jersey. It was in force for 4 hr. 7 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 6, 2020, 3:47 PM EDT (19:47 UTC)
Expired: Jul 6, 2020, 7:45 PM EDT
In force: 4 hr
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Flood severity: None

Counties Middlesex County, NJ, Morris County, NJ, Somerset County, NJ

The radar

The Philadelphia radar (KDIX), 75 km from the middle of the area, began a volume at 19:48 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 6, 3:55 PM EDT	FLASH FLOOD	1 Se Morristown, NJ	FLOODING NEAR THE JUNCTION OF MADISON AVE AND I-287.
Jul 6, 4:00 PM EDT	FLASH FLOOD	1 Ese Morristown, NJ	FRANKLIN ST CLOSED DUE TO FLASH FLOODING.
Jul 6, 4:10 PM EDT	FLASH FLOOD	1 Ne Morristown, NJ	THE WHIPPANY RIVER AT MORRISTOWN EXCEEDED FLOOD STAGE OF 6 FEET.
Jul 6, 4:11 PM EDT	FLASH FLOOD	1 Se Morristown, NJ	FLOODING ON I-287 BOTH DIRECTIONS APPROACHING EXIT 35. LANE CLOSURES IN PLACE.
Jul 6, 4:25 PM EDT	FLASH FLOOD	Morris Twp, NJ	WOODLAND AVE CLOSED DUE TO FLASH FLOODING.
Jul 6, 4:40 PM EDT	FLASH FLOOD	Morristown, NJ	PINE ST CLOSED DUE TO FLASH FLOODING.
Jul 6, 4:46 PM EDT	FLASH FLOOD	2 Wnw New Vernon, NJ	FLOODING ON US-202 IN BOTH DIRECTIONS NEAR CR 646/TEMPE WICK RD. LANE CLOSURES IN PLACE. TIME ESTIMATED FROM RADAR.

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, 7.8 hours before the alert went out and 136 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: 100 J/kg
Mixed-layer CIN: -192 J/kg
Mixed-layer LCL: 1959 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 39 m²/s²
0-3 km storm-relative helicity: 135 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.0

Open this sounding in Storm Lab

The text

As transmitted.

718 
WGUS51 KPHI 061947
FFWPHI
NJC023-027-035-062345-
/O.NEW.KPHI.FF.W.0012.200706T1947Z-200706T2345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
347 PM EDT Mon Jul 6 2020

The National Weather Service in Mount Holly NJ has issued a

* Flash Flood Warning for...
  Southern Morris County in northern New Jersey...
  Northeastern Somerset County in northern New Jersey...
  Middlesex County in northern New Jersey...

* Until 745 PM EDT.

* At 347 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 ongoing or expected to begin
  shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  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...
  New Brunswick, Perth Amboy, Morristown, Somerset, Edison, Old
  Bridge, East Brunswick, Bridgewater, Sayreville, North Brunswick,
  Carteret, Madison, Middlesex, Florham Park, East Hanover, Bound
  Brook, Chatham, Morris Plains, Mendham and Peapack And Gladstone.

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.

Excessive runoff from heavy rainfall will cause flooding of small
creeks and streams, urban areas, highways, streets, and underpasses
as well as other drainage areas and low lying spots.

&&

LAT...LON 4056 7421 4055 7425 4050 7426 4050 7428
      4045 7423 4035 7454 4058 7454 4061 7471
      4066 7473 4071 7472 4074 7480 4081 7484
      4087 7433 4074 7437 4067 7446 4065 7440
      4060 7446 4060 7421

FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL...1-2 INCHES IN 1 HOUR

$$

CMS

4 follow-up statements

658 
WGUS71 KPHI 062019
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
419 PM EDT Mon Jul 6 2020

NJC023-027-035-062345-
/O.CON.KPHI.FF.W.0012.000000T0000Z-200706T2345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Morris NJ-Somerset NJ-Middlesex NJ-
419 PM EDT Mon Jul 6 2020

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 745 PM EDT FOR
SOUTHERN MORRIS...NORTHEASTERN SOMERSET AND MIDDLESEX COUNTIES...

At 418 PM EDT, gauge reports indicated the Whippany River in 
Morristown has reached flood stage. Law enforcement reports several 
roads in town are flooding at this time. Up to three inches of rain 
have already fallen. This is a dangerous situation. Flash flooding 
is already occurring.

HAZARD...Life threatening flash flooding. Heavy rain producing flash 
         flooding.

SOURCE...Automated gauges.

IMPACT...Life threatening flash flooding of creeks and streams, 
         urban areas, highways, streets and underpasses.

Some locations that could experience flooding include...
New Brunswick, Perth Amboy, Morristown, Somerset, Edison, Old Bridge,
East Brunswick, Bridgewater, Sayreville, North Brunswick, Carteret,
Madison, Middlesex, Florham Park, East Hanover, Bound Brook, Chatham,
Morris Plains, Mendham and Peapack And Gladstone.

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.

Excessive runoff from heavy rainfall will cause flooding of small
creeks and streams, urban areas, highways, streets, and underpasses
as well as other drainage areas and low lying spots.

&&

LAT...LON 4056 7421 4055 7425 4050 7426 4050 7428
      4045 7423 4035 7454 4058 7454 4061 7471
      4066 7473 4071 7472 4074 7480 4081 7484
      4087 7433 4074 7437 4067 7446 4065 7440
      4060 7446 4060 7421

FLASH FLOOD...GAUGE INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
EXPECTED RAINFALL...1-2 INCHES IN 1 HOUR

$$

CMS

487 
WGUS71 KPHI 062105
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
505 PM EDT Mon Jul 6 2020

NJC023-027-035-062345-
/O.CON.KPHI.FF.W.0012.000000T0000Z-200706T2345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Morris NJ-Somerset NJ-Middlesex NJ-
505 PM EDT Mon Jul 6 2020

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 745 PM EDT FOR
SOUTHERN MORRIS...NORTHERN SOMERSET AND NORTHEASTERN MIDDLESEX
COUNTIES...

At 505 PM EDT, law enforcement reported flash flooding continuing in 
Morristown. Several roads are closed, with flooding reported on 
Interstate 287, Madison Avenue, Woodland Avenue, and Pine Street. 
This remains a dangerous situation.

HAZARD...Life threatening flash flooding. Heavy rain producing flash 
         flooding.

SOURCE...Law enforcement.

IMPACT...Life threatening flash flooding of creeks and streams, 
         urban areas, highways, streets and underpasses.

Some locations that could experience flooding include...
Morristown, Bridgewater, Carteret, Madison, Middlesex, Florham Park,
East Hanover, Bound Brook, Chatham, Morris Plains, Mendham, Peapack
And Gladstone, Chester, Far Hills, Colonia, Long Valley,
Martinsville, Millington, Basking Ridge and Parsippany.

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.

Excessive runoff from heavy rainfall will cause flooding of small
creeks and streams, urban areas, highways, streets, and underpasses
as well as other drainage areas and low lying spots.

&&

LAT...LON 4056 7421 4055 7425 4058 7454 4061 7471
      4066 7473 4071 7472 4074 7480 4081 7484
      4087 7433 4074 7437 4067 7446 4065 7440
      4060 7446 4060 7421

FLASH FLOOD...OBSERVED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE

$$

CMS

286 
WGUS71 KPHI 062251
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
651 PM EDT Mon Jul 6 2020

NJC023-062259-
/O.CAN.KPHI.FF.W.0012.000000T0000Z-200706T2345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Middlesex NJ-
651 PM EDT Mon Jul 6 2020

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

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

LAT...LON 4071 7472 4083 7471 4087 7433 4074 7437
      4067 7446

$$

NJC027-035-062345-
/O.CON.KPHI.FF.W.0012.000000T0000Z-200706T2345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Morris NJ-Somerset NJ-
651 PM EDT Mon Jul 6 2020

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 745 PM EDT FOR
SOUTHEASTERN MORRIS AND NORTH CENTRAL SOMERSET COUNTIES...

At 649 PM EDT, law enforcement reported flooding was continuing in 
Morristown, with several reports of road closures. Although the 
heavy rainfall has ended, flooding will continue to pose a threat 
for the next hour.

HAZARD...Flash flooding caused by heavy rain.

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...
Morristown, Madison, Florham Park, East Hanover, Chatham, Morris
Plains, Mendham, Peapack And Gladstone, Chester, Far Hills,
Parsippany, Basking Ridge, Succasunna-Kenvil, Bernardsville and
Hanover Township.

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.

Excessive runoff from heavy rainfall will cause flooding of small
creeks and streams, urban areas, highways, streets, and underpasses
as well as other drainage areas and low lying spots.

&&

LAT...LON 4071 7472 4083 7471 4087 7433 4074 7437
      4067 7446

FLASH FLOOD...OBSERVED

$$

CMS

844 
WGUS71 KPHI 062336
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
736 PM EDT Mon Jul 6 2020

NJC027-035-062345-
/O.EXP.KPHI.FF.W.0012.000000T0000Z-200706T2345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Morris NJ-Somerset NJ-
736 PM EDT Mon Jul 6 2020

...THE FLASH FLOOD WARNING FOR SOUTHEASTERN MORRIS AND NORTH CENTRAL
SOMERSET COUNTIES WILL EXPIRE AT 745 PM EDT...

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

LAT...LON 4071 7472 4083 7471 4087 7433 4074 7437
      4067 7446

$$

CMS

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 6, 3:16 AM EDT	Heat Advisory	PHI	Burlington, Camden, Gloucester, Mercer	12 hr
Jul 6, 12:45 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden	60 min
Jul 6, 12:52 PM EDT	Flash Flood Watch	PHI	Burlington, Camden, Gloucester, Mercer, Salem	8 hr
Jul 6, 12:57 PM EDT	Areal Flood Advisory	PHI	Burlington, Camden	2 hr
Jul 6, 1:08 PM EDT	Flash Flood Warning	PHI	Burlington, Camden	4 hr
Jul 6, 1:15 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Mercer, Monmouth	60 min
Jul 6, 1:43 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden	62 min
Jul 6, 1:52 PM EDT	Special Weather Statement	PHI	Ocean	23 min
Jul 6, 2:00 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Mercer, Middlesex, Monmouth, Ocean	75 min
Jul 6, 2:02 PM EDT	Areal Flood Advisory	PHI	Burlington, Camden, Mercer, Middlesex, Monmouth, Ocean	118 min
Jul 6, 2:39 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Camden, Gloucester, Ocean	66 min
Jul 6, 2:41 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Mercer	49 min
Jul 6, 2:46 PM EDT	Special Marine Warning	PHI		89 min
Jul 6, 2:48 PM EDT	Areal Flood Advisory	PHI	Atlantic, Burlington, Camden, Gloucester, Ocean	4 hr
Jul 6, 2:51 PM EDT	Severe Thunderstorm Warning	PHI	Middlesex, Monmouth	39 min
Jul 6, 2:57 PM EDT	Flash Flood Warning EmergencyCatastrophic damage threat	PHI	Burlington, Camden, Gloucester	4 hr
Jul 6, 3:00 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Warren	45 min
Jul 6, 3:14 PM EDT	Severe Thunderstorm Warning	PHI	Monmouth, Ocean	46 min
Jul 6, 3:18 PM EDT	Severe Thunderstorm Warning	PHI	Middlesex, Somerset	42 min
Jul 6, 3:34 PM EDT	Areal Flood Advisory	PHI	Middlesex, Monmouth, Somerset	116 min
Jul 6, 3:36 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Ocean	54 min
Jul 6, 3:36 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Morris, Somerset	39 min
Jul 6, 3:38 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Warren	52 min
Jul 6, 3:44 PM EDT	Special Marine Warning	PHI		61 min
Jul 6, 3:44 PM EDT	Special Marine Warning	PHI		61 min
Jul 6, 3:47 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Camden, Cumberland, Gloucester, Salem	58 min
Jul 6, 4:41 PM EDT	Special Marine Warning	PHI		64 min
Jul 6, 4:45 PM EDT	Special Marine Warning	PHI		41 min
Jul 6, 4:45 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Cape May, Cumberland, Salem	60 min
Jul 6, 4:58 PM EDT	Special Marine Warning	PHI		62 min
Jul 6, 5:24 PM EDT	Areal Flood Advisory	PHI	Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 2 more	4 hr
Jul 6, 5:39 PM EDT	Special Marine Warning	PHI		66 min
Jul 6, 5:43 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Cape May, Cumberland	47 min
Jul 6, 5:57 PM EDT	Special Marine Warning	PHI		63 min
Jul 6, 6:00 PM EDT	Severe Thunderstorm Warning	PHI	Salem	60 min
Jul 6, 6:43 PM EDT	Special Marine Warning	PHI		44 min
Jul 6, 6:56 PM EDT	Special Marine Warning	PHI		47 min
Jul 6, 7:18 PM EDT	Severe Thunderstorm Warning	PHI	Sussex, Warren	36 min
Jul 6, 7:55 PM EDT	Special Weather Statement	PHI	Sussex	50 min

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.