Alert archive / New Jersey / Areal Flood Warnings in 2021

Areal Flood Warning 44, NWS Philadelphia/Mount Holly

September 2, 20215 counties in New Jersey; Bucks County, Pennsylvania

NWS Philadelphia/Mount Holly issued this areal flood warning at Sep 2, 2021, 3:52 AM EDT for 5 counties in New Jersey; Bucks County, Pennsylvania. It was in force for 8 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
Sep 2, 2021, 3:52 AM EDT (07:52 UTC)
Expired
Sep 2, 2021, 12:15 PM EDT
In force
8 hr
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon
Flood severity
None

Counties Hunterdon County, NJ, Mercer County, NJ, Morris County, NJ, Somerset County, NJ, Warren County, NJ, Bucks County, PA

The radar

The Philadelphia radar (KDIX), 53 km from the middle of the area, began a volume at 07:54 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
Sep 2, 4:53 AM EDTHEAVY RAIN 5.7Washington, NJ
Sep 2, 12:15 PM EDTFLOOD2 Ne Solebury Twp, PATHE GAUGE ON THE DELAWARE RIVER AT STOCKTON (STKN4) REACHED FLOOD STAGE AT 1215 PM 9/2, CRESTING AT 19.32 FEET (MINOR FLOODING) AT 645 PM 9/2.

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, 7.9 hours before the alert went out and 179 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 2021-09-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 123 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Brookhaven, NY at 00:00Z on 2021-09-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 279 square meters per square second.19395878Sfc1 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
123 J/kg
Mixed-layer CIN
-47 J/kg
Mixed-layer LCL
512 m above ground
0-6 km bulk shear
53 kt
0-1 km storm-relative helicity
279 m²/s²
0-3 km storm-relative helicity
456 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.2

Open this sounding in Storm Lab

The text

As transmitted.

126 
WGUS41 KPHI 020752
FLWPHI

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Flood Warning
National Weather Service Mount Holly NJ
352 AM EDT Thu Sep 2 2021

NJC019-021-027-035-041-PAC017-021700-
/O.NEW.KPHI.FA.W.0044.210902T0752Z-210902T1700Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Hunterdon NJ-Mercer NJ-Morris NJ-Somerset NJ-Warren NJ-Bucks PA-
352 AM EDT Thu Sep 2 2021

The National Weather Service in Mount Holly has issued a

* Flood Warning for...
  Western Mercer County in central New Jersey...
  Southwestern Morris County in northern New Jersey...
  Western Somerset County in northern New Jersey...
  Hunterdon County in northwestern New Jersey...
  Southwestern Warren County in northwestern New Jersey...
  Eastern Bucks County in southeastern Pennsylvania...

* Until 100 PM EDT Thursday.

* At 352 AM EDT, local law enforcement reported widespread flooding 
  continuing across the warning area. Many roads are closed, and 
  several rivers and streams are in flood. Flooding will continue 
  for several more hours. Please heed road closures!

* Some locations that may experience flooding include...
  Trenton, Ewing, Burlington, Bristol, Byram, Washington, 
  Flemington, High Bridge, Clinton, Pennington, New Hope, and 
  Yardley.

This includes the following highways...
	Pennsylvania Turnpike between mile markers 352 and 359.
	Interstate 95 in Pennsylvania between mile markers 38 and 40.
	Interstate 78 in New Jersey between mile markers 6 and 27.
	Interstate 295 in New Jersey between mile markers 59 and 62...and
	between mile markers 68 and 76.
	Interstate 195 in New Jersey between mile markers 0 and 1.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4078 7512 4078 7489 4073 7472 4018 7470
      4018 7471 4017 7471 4017 7470 4016 7471
      4012 7478 4013 7482 4010 7484 4009 7486
      4008 7486 4008 7488 4019 7506

$$

CMS
1 follow-up statement
477 
WGUS81 KPHI 021615
FLSPHI

Flood Statement
National Weather Service Mount Holly NJ
1215 PM EDT Thu Sep 2 2021

NJC019-021-027-035-041-PAC017-021625-
/O.CAN.KPHI.FA.W.0044.000000T0000Z-210902T1700Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Hunterdon NJ-Mercer NJ-Morris NJ-Somerset NJ-Warren NJ-Bucks PA-
1215 PM EDT Thu Sep 2 2021

...FLOOD WARNING IS CANCELLED FOR WESTERN MERCER, SOUTHWESTERN 
MORRIS, WESTERN SOMERSET, HUNTERDON, SOUTHWESTERN WARREN, AND 
EASTERN BUCKS COUNTIES...

This flood warning has been cancelled. Additional flood warnings 
remain in place across the area.

LAT...LON 4078 7512 4078 7489 4073 7472 4018 7470
      4018 7471 4017 7471 4017 7470 4016 7471
      4012 7478 4013 7482 4010 7484 4009 7486
      4008 7486 4008 7488 4019 7506

$$

Kruzdlo

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 1, 8:02 PM EDTFlash Flood Warning EmergencyCatastrophic damage threatPHIMiddlesex, Morris, Somerset5 hr
Sep 1, 9:01 PM EDTFlash Flood WarningPHIBurlington, Mercer, Middlesex, Monmouth, Ocean5 hr
Sep 1, 9:43 PM EDTRiver Flood WarningPHIMercer33 hr
Sep 1, 10:05 PM EDTFlash Flood Warning Considerable damage threatPHIMorris, Somerset4 hr
Sep 1, 10:23 PM EDTCoastal Flood StatementPHIOcean13 hr
Sep 1, 10:24 PM EDTFlash Flood WarningPHIBurlington, Camden, Gloucester4 hr
Sep 1, 10:29 PM EDTRiver Flood WarningPHIHunterdon, Mercer49 hr
Sep 1, 10:32 PM EDTRiver Flood WarningPHIMercer31 hr
Sep 1, 10:35 PM EDTRiver Flood WarningPHIBergen, Morris, Passaic30 hr
Sep 1, 10:37 PM EDTRiver Flood WarningPHIMorris, Passaic41 hr
Sep 1, 10:38 PM EDTRiver Flood WarningPHIMorris, Somerset21 days
Sep 1, 10:47 PM EDTAreal Flood WarningPHIWarren23 hr
Sep 1, 10:52 PM EDTAreal Flood WarningPHIHunterdon, Warren12 hr
Sep 2, 12:01 AM EDTAreal Flood WarningPHIHunterdon, Morris, Sussex, Warren40 hr
Sep 2, 12:28 AM EDTAreal Flood AdvisoryPHIAtlantic, Burlington, Camden, Gloucester3 hr
Sep 2, 12:31 AM EDTAreal Flood AdvisoryPHIMonmouth, Ocean2 hr
Sep 2, 1:38 AM EDTAreal Flood WarningPHIBurlington, Mercer, Middlesex, Monmouth, Ocean4 hr
Sep 2, 1:52 AM EDTAreal Flood WarningPHIMorris, Somerset13 hr
Sep 2, 2:23 AM EDTAreal Flood WarningPHIBurlington, Camden, Gloucester, Salem9 hr
Sep 2, 2:29 AM EDTAreal Flood WarningPHIBurlington, Camden, Gloucester5 hr
Sep 2, 3:53 AM EDTAreal Flood WarningPHIHunterdon, Mercer, Middlesex, Morris, Somerset8 hr
Sep 2, 4:00 AM EDTRiver Flood WarningPHIMorris48 hr
Sep 2, 4:45 AM EDTRiver Flood WarningPHIHunterdon, Mercer37 hr
Sep 2, 4:45 AM EDTRiver Flood WarningPHIHunterdon, Warren37 hr
Sep 2, 4:45 AM EDTRiver Flood WarningPHIHunterdon37 hr
Sep 2, 4:45 AM EDTRiver Flood WarningPHIHunterdon33 hr
Sep 2, 4:45 AM EDTRiver Flood WarningPHIHunterdon, Mercer34 hr
Sep 2, 4:45 AM EDTRiver Flood WarningPHISussex, Warren5 hr
Sep 2, 6:05 AM EDTCoastal Flood WarningPHIBurlington, Camden, Gloucester, Mercer6 hr
Sep 2, 1:20 PM EDTAreal Flood WarningPHIMiddlesex21 hr
Sep 2, 6:44 PM EDTCoastal Flood AdvisoryPHIBurlington, Camden, Gloucester7 hr
Sep 1, 8:29 PM EDTRiver Flood WarningPHILehigh10 hr
Sep 1, 9:47 PM EDTRiver Flood WarningPHIBerks18 hr
Sep 1, 10:42 PM EDTAreal Flood WarningPHIBerks, Bucks, Montgomery12 hr
Sep 1, 11:38 PM EDTAreal Flood WarningPHIBerks, Chester, Delaware, Montgomery10 hr
Sep 2, 2:41 AM EDTAreal Flood WarningPHIBucks14 hr
Sep 2, 5:02 AM EDTRiver Flood WarningPHILehigh11 hr

Nearby

Areal Flood Warnings in New Jersey, 2021Areal Flood Warnings in Pennsylvania, 2021Every areal 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.