Alert archive / New Jersey / Areal Flood Warnings in 2021

Areal Flood Warning 35, NWS Philadelphia/Mount Holly

September 1, 2021Hunterdon County, Warren County, New Jersey; Bucks County, Pennsylvania

NWS Philadelphia/Mount Holly issued this areal flood warning at Sep 1, 2021, 10:52 PM EDT for Hunterdon County, Warren County, New Jersey; Bucks County, Pennsylvania. It was in force for 12 hr. 1 report 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 1, 2021, 10:52 PM EDT (02:52 UTC)
Expired
Sep 2, 2021, 10:47 AM EDT
In force
12 hr
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon
Flood severity
None

Counties Hunterdon County, NJ, Warren County, NJ, Bucks County, PA

The radar

The Philadelphia radar (KDIX), 96 km from the middle of the area, began a volume at 02:56 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, 1:50 AM EDTFLASH FLOOD1 Ne Revere, PAMARIENSTEIN ROAD CLOSED FROM FLOODING. TIME BASED ON DISPATCH REPORT.

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, 2.9 hours before the alert went out and 190 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°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Brookhaven, NY at 00:00Z on 2021-09-02The 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.

449 
WGUS41 KPHI 020252
FLWPHI

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Flood Warning
National Weather Service Mount Holly NJ
1052 PM EDT Wed Sep 1 2021

NJC019-041-PAC017-021500-
/O.NEW.KPHI.FA.W.0035.210902T0252Z-210902T1500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Hunterdon NJ-Warren NJ-Bucks PA-
1052 PM EDT Wed Sep 1 2021

The National Weather Service in Mount Holly has issued a

* Flood Warning for...
  Southwestern Hunterdon County in northwestern New Jersey...
  Southwestern Warren County in northwestern New Jersey...
  North Central Bucks County in southeastern Pennsylvania...

* Until 1100 AM EDT Thursday.

* At 1052 PM EDT, local law enforcement reported widespread flooding 
  in the warned area. Numerous roads are closed, and several river 
  and stream gauges are in flood. Flooding will continue through the 
  night.

* Some locations that may experience flooding include...
  Byram, Harmony, New Hope, Alpha, Ferndale, Frenchtown, Milford, 
  Bloomsbury, Stockton, Erwinna, Revere, and Lumberville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4033 7497 4056 7523 4058 7519 4067 7518
      4068 7518 4078 7516 4078 7515 4077 7514
      4077 7513 4078 7513 4077 7510 4055 7497
      4041 7494

$$

CMS
1 follow-up statement
353 
WGUS81 KPHI 021447
FLSPHI

Flood Statement
National Weather Service Mount Holly NJ
1047 AM EDT Thu Sep 2 2021

NJC019-041-PAC017-021457-
/O.CAN.KPHI.FA.W.0035.000000T0000Z-210902T1500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Hunterdon NJ-Warren NJ-Bucks PA-
1047 AM EDT Thu Sep 2 2021

...FLOOD WARNING IS CANCELLED FOR SOUTHWESTERN HUNTERDON, 
SOUTHWESTERN WARREN, AND NORTH CENTRAL BUCKS COUNTIES...

The heavy rain has ended. The flood warning has been cancelled.

LAT...LON 4058 7519 4067 7518 4068 7518 4078 7516
      4077 7513 4078 7513 4077 7510 4055 7497
      4041 7494 4033 7497 4056 7523

$$

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 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, 3:52 AM EDTAreal Flood WarningPHIHunterdon, Mercer, Morris, Somerset, Warren8 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.