Alert archive / New Jersey / Flash Flood Warnings in 2021

Flash Flood Warning 92, NWS Philadelphia/Mount Holly

October 26, 20214 counties in New Jersey

NWS Philadelphia/Mount Holly issued this flash flood warning at Oct 26, 2021, 4:14 AM EDT for 4 counties in New Jersey. It was in force for 4 hr. 9 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
Oct 26, 2021, 4:14 AM EDT (08:14 UTC)
Expired
Oct 26, 2021, 8:15 AM EDT
In force
4 hr
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon
Flood severity
None

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

The radar

The Philadelphia radar (KDIX), 85 km from the middle of the area, began a volume at 08:13 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
Oct 26, 6:15 AM EDTFLASH FLOOD3 S Dunellen, NJSOUTH RANDOLPHVILLE ROAD CLOSED BETWEEN SIDNEY ROAD AND CENTENNIAL AVE DUE TO FLOODING.
Oct 26, 6:33 AM EDTFLASH FLOOD1 Ene Green Brook Twp, NJWATER RESCUE ON LAWRENCE AVENUE. TIME BASED ON DISPATCH REPORT.
Oct 26, 7:30 AM EDTFLASH FLOOD1 Ene Neshanic Station, NJRIVERSIDE DRIVE CLOSED BETWEEN CLAWSON AVENUE AND MILL LANE AND THREE BRIDGES ROAD CLOSED BETWEEN WOODFERN AND HOCKENBERRY FROM FLOODING. TIME BASED ON DISPATCH REPORTS.
Oct 26, 7:30 AM EDTHEAVY RAIN 3.620.8 Wsw Madison, NJ
Oct 26, 7:40 AM EDTFLASH FLOODSouth Plainfield, NJHAMILTON BOULEVARD AND NEW MARKET AVENUE CLOSED FROM FLOODING. TIME BASED ON DISPATCH REPORT.
Oct 26, 8:00 AM EDTFLASH FLOOD1 W South Bound Brook, NJTHE GAUGE ON MIDDLE BROOK AT BOUND BROOK (BDBN4) REACHED FLOOD STAGE.
Oct 26, 8:00 AM EDTHEAVY RAIN 3.54Randolph, NJ
Oct 26, 8:06 AM EDTFLASH FLOOD1 N North Plainfield, NJFLOODING ON U.S. HIGHWAY 22 AT NORTH DRIVE. ALL LANES CLOSED. TIME BASED ON DISPATCH REPORT.
Oct 26, 8:10 AM EDTFLASH FLOOD1 Ne Morristown, NJTHE GAUGE ON THE WHIPPANY RIVER IN MORRISTOWN (WHIN4) REACHED FLOOD STAGE.

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 00:00Z, 8.2 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-pSkew-T log-p diagram, Brookhaven, NY at 00:00Z on 2021-10-26Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 544 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 00:00Z on 2021-10-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 96 square meters per square second.1939587897Sfc1 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
544 J/kg
Mixed-layer CIN
-23 J/kg
Mixed-layer LCL
758 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
96 m²/s²
0-3 km storm-relative helicity
52 m²/s²
Significant tornado parameter
0.2
Supercell composite
1.0

Open this sounding in Storm Lab

The text

As transmitted.

572 
WGUS51 KPHI 260814
FFWPHI
NJC019-023-027-035-261215-
/O.NEW.KPHI.FF.W.0092.211026T0814Z-211026T1215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
414 AM EDT Tue Oct 26 2021

The National Weather Service in Mount Holly has issued a

* Flash Flood Warning for...
  Northwestern Middlesex County in northern New Jersey...
  Morris County in northern New Jersey...
  Somerset County in northern New Jersey...
  Northeastern Hunterdon County in northwestern New Jersey...

* Until 815 AM EDT.

* At 414 AM EDT, Doppler radar indicated heavy rain across the 
  warned area. Between 1 and 2 inches of rain have fallen. 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, Morristown, Somerville, Somerset, Bridgewater, 
  Dover, Madison, Middlesex, Florham Park, East Hanover, Lincoln 
  Park, and Bound Brook.

This includes the following highways...
	Interstate 78 in New Jersey between mile markers 27 and 42.
	Interstate 80 in New Jersey between mile markers 35 and 48.
	Interstate 287 in New Jersey between mile markers 5 and 53.
	Garden State Parkway between mile markers 133 and 134.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Be especially cautious at night when it is harder to recognize the 
dangers of flooding.

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

&&

LAT...LON 4073 7473 4104 7445 4102 7443 4099 7429
      4090 7428 4091 7433 4086 7432 4076 7438
      4075 7436 4067 7446 4066 7445 4066 7440
      4060 7446 4059 7429 4055 7445 4050 7447
      4038 7459 4039 7466 4046 7475

FLASH FLOOD...RADAR INDICATED

$$

PO
1 follow-up statement
817 
WGUS71 KPHI 261208
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
808 AM EDT Tue Oct 26 2021

NJC019-023-027-035-261218-
/O.EXP.KPHI.FF.W.0092.000000T0000Z-211026T1215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Hunterdon NJ-Middlesex NJ-Morris NJ-Somerset NJ-
808 AM EDT Tue Oct 26 2021

...FLASH FLOOD WARNING WILL EXPIRE AT 815 AM EDT THIS MORNING FOR 
NORTHWESTERN MIDDLESEX, MORRIS, SOMERSET, AND NORTHEASTERN HUNTERDON 
COUNTIES...

The flash flood warning has been replaced by a flood warning. Please 
refer to that bulletin for more information.

LAT...LON 4073 7473 4104 7445 4102 7443 4099 7429
      4090 7428 4091 7433 4086 7432 4076 7438
      4075 7436 4067 7446 4066 7445 4066 7440
      4060 7446 4059 7429 4055 7445 4050 7447
      4038 7459 4039 7466 4046 7475

$$

CMS

The office that day

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

IssuedProductOfficeCountiesLasted
Oct 25, 8:26 PM EDTSpecial Weather StatementPHIMercer34 min
Oct 25, 8:33 PM EDTSpecial Weather StatementPHIWarren42 min
Oct 25, 9:09 PM EDTSpecial Weather StatementPHIMiddlesex, Morris, Somerset51 min
Oct 26, 1:22 AM EDTAreal Flood WarningPHIAtlantic, Burlington, Cape May, Cumberland, Ocean5 hr
Oct 26, 2:08 AM EDTFlash Flood WarningPHIBurlington, Mercer, Middlesex, Monmouth, Ocean4 hr
Oct 26, 3:08 AM EDTFlash Flood WarningPHIMiddlesex, Monmouth, Ocean8 hr
Oct 26, 5:22 AM EDTAreal Flood AdvisoryPHIMorris, Sussex, Warren2 hr
Oct 26, 6:09 AM EDTAreal Flood WarningPHIBurlington, Mercer, Middlesex, Monmouth, Ocean3 hr
Oct 26, 6:18 AM EDTAreal Flood WarningPHIHunterdon, Mercer, Middlesex, Somerset13 hr
Oct 26, 7:15 AM EDTAreal Flood WarningPHIMonmouth, Ocean5 hr
Oct 26, 7:32 AM EDTRiver Flood WarningPHISomerset28 hr
Oct 26, 7:38 AM EDTAreal Flood WarningPHIHunterdon, Morris, Somerset, Sussex, Warren37 hr
Oct 26, 8:07 AM EDTAreal Flood WarningPHIHunterdon, Middlesex, Morris, Somerset12 hr
Oct 26, 8:18 AM EDTRiver Flood WarningPHIMorris, Somerset8 hr
Oct 26, 10:12 AM EDTRiver Flood WarningPHISomerset11 hr
Oct 26, 10:12 AM EDTRiver Flood WarningPHIMiddlesex, Somerset24 hr
Oct 26, 10:12 AM EDTRiver Flood WarningPHIMiddlesex, Somerset33 hr
Oct 26, 10:50 AM EDTAreal Flood WarningPHIMiddlesex, Monmouth, Ocean9 hr
Oct 26, 4:24 PM EDTRiver Flood WarningPHIMorris31 hr
Oct 26, 4:28 PM EDTRiver Flood WarningPHIMorris, Passaic29 hr
Oct 26, 4:39 PM EDTRiver Flood WarningPHIEssex, Morris, Passaic54 hr
Oct 26, 4:39 PM EDTRiver Flood WarningPHIEssex, Passaic42 hr

Nearby

Flash Flood Warnings in New Jersey, 2021Every flash flood warning in 2021

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.