Alert archive / New Jersey / Flash Flood Warnings in 2023

Flash Flood Warning 67, NWS Philadelphia/Mount Holly

July 16, 2023Middlesex County, Somerset County, New Jersey

NWS Philadelphia/Mount Holly issued this flash flood warning at Jul 16, 2023, 11:36 AM EDT for Middlesex County, Somerset County, New Jersey. It was in force for 3 hr. 4 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 16, 2023, 11:36 AM EDT (15:36 UTC)
Expired
Jul 16, 2023, 2:20 PM EDT
In force
3 hr
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon
Flood severity
None

Counties Middlesex County, NJ, Somerset County, NJ

The radar

The Philadelphia radar (KDIX), 61 km from the middle of the area, began a volume at 15:36 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

TimeReportWhereRemark
Jul 16, 11:50 AM EDTFLASH FLOOD1 Se Metuchen, NJVideo of flooding on Route 1 in Edison.
Jul 16, 12:18 PM EDTFLOOD1 Ese Edison, NJFlooding on I-287 southbound North of Exit 1 - US 1 in Edison Twp. 1 Right lane closed.
Jul 16, 12:40 PM EDTFLASH FLOOD1 Sw North Brunswick, NJFlooding on NJ 91 both directions South of Huron Rd (North Brunswick Twp) All lanes closed.
Jul 16, 1:30 PM EDTFLASH FLOOD1 W New Brunswick, NJReport of a vehicle stuck near Woodbridge Street.

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, 3.6 hours before the alert went out and 143 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-pSkew-T log-p diagram, Brookhaven, NY at 12:00Z on 2023-07-16Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 236 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Brookhaven, NY at 12:00Z on 2023-07-16The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 193 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
236 J/kg
Mixed-layer CIN
-31 J/kg
Mixed-layer LCL
766 m above ground
0-6 km bulk shear
41 kt
0-1 km storm-relative helicity
193 m²/s²
0-3 km storm-relative helicity
223 m²/s²
Significant tornado parameter
0.2
Supercell composite
6.0

Open this sounding in Storm Lab

The text

As transmitted.

596 
WGUS51 KPHI 161536
FFWPHI
NJC023-035-161830-
/O.NEW.KPHI.FF.W.0067.230716T1536Z-230716T1830Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
1136 AM EDT Sun Jul 16 2023

The National Weather Service in Mount Holly has issued a

* Flash Flood Warning for...
  Northwestern Middlesex County in northern New Jersey...
  Southeastern Somerset County in northern New Jersey...

* Until 230 PM EDT.

* At 1136 AM EDT, Doppler radar indicated heavy rain across the 
  warned area. Between 1 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 heavy rain.

  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...
  New Brunswick, Somerset, Edison, East Brunswick, South Brunswick, 
  North Brunswick, North Brunswick Township, Society Hill, Dayton, 
  Kendall Park, South Plainfield, and South River.

This includes the following highways...
	New Jersey Turnpike between exits 10 and 11.
	Interstate 287 in New Jersey between mile markers 0 and 10.

This includes the following streams and drainages...
  Raritan and Sandy Hook-Staten Island.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4042 7463 4050 7456 4056 7449 4059 7442
      4056 7434 4052 7433 4047 7439 4037 7457

FLASH FLOOD...RADAR INDICATED

$$

MJL
3 follow-up statements
079 
WGUS71 KPHI 161637
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
1237 PM EDT Sun Jul 16 2023

NJC023-035-161830-
/O.CON.KPHI.FF.W.0067.000000T0000Z-230716T1830Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Middlesex NJ-Somerset NJ-
1237 PM EDT Sun Jul 16 2023

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 230 PM EDT THIS 
AFTERNOON FOR NORTHWESTERN MIDDLESEX AND SOUTHEASTERN SOMERSET 
COUNTIES...

At 1237 PM EDT, emergency management reported heavy rain across the 
warned area. Between 1 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 heavy rain.

SOURCE...Emergency management reported flooding on I-287
         southbound near Exit 1 - US 1 in Edison Township,
         Middlesex County resulting in one right lane closed.

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...
  New Brunswick, Somerset, Edison, East Brunswick, South Brunswick, 
  North Brunswick, North Brunswick Township, Society Hill, Dayton, 
  Kendall Park, South Plainfield, and South River.

This includes the following highways...
	New Jersey Turnpike between exits 10 and 11.
	Interstate 287 in New Jersey between mile markers 0 and 10.

This includes the following streams and drainages...
  Raritan and Sandy Hook-Staten Island.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Be aware of your surroundings and do not drive on flooded roads.

&&

LAT...LON 4042 7463 4050 7456 4056 7449 4059 7442
      4056 7434 4052 7433 4047 7439 4037 7457

FLASH FLOOD...OBSERVED

$$

MJL
072 
WGUS71 KPHI 161654
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
1254 PM EDT Sun Jul 16 2023

NJC023-035-161830-
/O.CON.KPHI.FF.W.0067.000000T0000Z-230716T1830Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Middlesex NJ-Somerset NJ-
1254 PM EDT Sun Jul 16 2023

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 230 PM EDT THIS 
AFTERNOON FOR NORTHWESTERN MIDDLESEX AND SOUTHEASTERN SOMERSET 
COUNTIES...

At 1254 PM EDT, emergency management reported heavy rain across the 
warned area. Between 1 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 heavy rain.

SOURCE...Emergency management reported flooding on NJ 91 south of
         Huron Rd in North Brunswick Twp, Middlesex County - all
         lanes closed... I-287 southbound near Exit 1 - US 1 in
         Edison Township, Middlesex County resulting in one right
         lane closed...

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...
  New Brunswick, Somerset, Edison, East Brunswick, South Brunswick, 
  North Brunswick, North Brunswick Township, Society Hill, Dayton, 
  Kendall Park, South Plainfield, and South River.

This includes the following highways...
	New Jersey Turnpike between exits 10 and 11.
	Interstate 287 in New Jersey between mile markers 0 and 10.

This includes the following streams and drainages...
  Raritan and Sandy Hook-Staten Island.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Flooding is occurring or is imminent. Most flood related deaths 
occur in automobiles. Do not attempt to cross water covered bridges, 
dips, or low water crossings. Never try to cross a flowing stream, 
even a small one, on foot. To escape rising water find another route 
over higher ground.

&&

LAT...LON 4042 7463 4050 7456 4056 7449 4059 7442
      4056 7434 4052 7433 4047 7439 4037 7457

FLASH FLOOD...OBSERVED

$$

MJL
638 
WGUS71 KPHI 161820
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
220 PM EDT Sun Jul 16 2023

NJC023-035-161830-
/O.CAN.KPHI.FF.W.0067.000000T0000Z-230716T1830Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Middlesex NJ-Somerset NJ-
220 PM EDT Sun Jul 16 2023

...FLASH FLOOD WARNING FOR NORTHWESTERN MIDDLESEX AND SOUTHEASTERN 
SOMERSET COUNTIES HAS BEEN REPLACED WITH A FLOOD ADVISORY...

LAT...LON 4042 7463 4050 7456 4056 7449 4059 7442
      4056 7434 4052 7433 4047 7439 4037 7457

$$

MJL

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 16, 2:22 AM EDTSpecial Marine WarningPHI53 min
Jul 16, 2:47 AM EDTSpecial Weather StatementPHIGloucester, Salem28 min
Jul 16, 3:08 AM EDTSpecial Marine WarningPHI42 min
Jul 16, 3:40 AM EDTFlash Flood WarningPHISussex, Warren7 hr
Jul 16, 4:05 AM EDTFlash Flood WarningPHIHunterdon, Warren6 hr
Jul 16, 4:14 AM EDTSpecial Weather StatementPHIHunterdon31 min
Jul 16, 4:38 AM EDTTornado WarningPHIHunterdon, Somerset37 min
Jul 16, 4:50 AM EDTSpecial Weather StatementPHIBurlington, Ocean25 min
Jul 16, 5:07 AM EDTTornado WarningPHIHunterdon, Morris, Somerset38 min
Jul 16, 5:13 AM EDTFlash Flood WarningPHISussex, Warren4 hr
Jul 16, 5:16 AM EDTSpecial Weather StatementPHIOcean29 min
Jul 16, 5:26 AM EDTFlash Flood WarningPHIHunterdon, Morris, Sussex, Warren4 hr
Jul 16, 5:31 AM EDTTornado WarningPHIMorris, Somerset, Sussex29 min
Jul 16, 5:44 AM EDTSpecial Marine WarningPHI61 min
Jul 16, 5:45 AM EDTSpecial Weather StatementPHIMonmouth30 min
Jul 16, 5:58 AM EDTTornado WarningPHIMorris32 min
Jul 16, 7:52 AM EDTSpecial Marine WarningPHI53 min
Jul 16, 8:40 AM EDTSpecial Marine WarningPHI47 min
Jul 16, 10:54 AM EDTAreal Flood WarningPHIWarren5 hr
Jul 16, 11:08 AM EDTFlash Flood WarningPHIGloucester, Salem3 hr
Jul 16, 12:22 PM EDTAreal Flood AdvisoryPHIMercer3 hr
Jul 16, 12:26 PM EDTAreal Flood AdvisoryPHIBurlington, Camden3 hr
Jul 16, 1:47 PM EDTAreal Flood AdvisoryPHIGloucester, Salem80 min
Jul 16, 1:50 PM EDTSpecial Marine WarningPHI85 min
Jul 16, 2:20 PM EDTAreal Flood AdvisoryPHIMiddlesex, Somerset72 min
Jul 16, 2:42 PM EDTSpecial Weather StatementPHICape May48 min
Jul 16, 3:09 PM EDTSpecial Marine WarningPHI51 min
Jul 16, 6:17 PM EDTAreal Flood WarningPHIWarren10 hr
Jul 16, 6:19 PM EDTAreal Flood WarningPHIWarren10 hr

Nearby

Flash Flood Warnings in New Jersey, 2023Every 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.