Alert archive / New Jersey / Areal Flood Warnings in 2021

Areal Flood Warning 55, NWS Philadelphia/Mount Holly

October 26, 20215 counties in New Jersey; Bucks County, Pennsylvania

NWS Philadelphia/Mount Holly issued this areal flood warning at Oct 26, 2021, 6:09 AM EDT for 5 counties in New Jersey; Bucks County, Pennsylvania. 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
Oct 26, 2021, 6:09 AM EDT (10:09 UTC)
Expired
Oct 26, 2021, 9:00 AM EDT
In force
3 hr
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon
Flood severity
None

Counties Burlington County, NJ, Mercer County, NJ, Middlesex County, NJ, Monmouth County, NJ, Ocean County, NJ, Bucks County, PA

The radar

The Philadelphia radar (KDIX), 15 km from the middle of the area, began a volume at 10:09 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, 6:51 AM EDTFLOODHamilton Square, NJFLOODING ON STATE HIGHWAY 33 WESTBOUND EAST OF YARDVILLE-HAMILTON SQUARE. LANE RESTRICTIONS REQUIRED. TIME BASED ON DISPATCH REPORT.
Oct 26, 7:00 AM EDTHEAVY RAIN 3.471 Wsw East Windsor Twp, NJ
Oct 26, 7:30 AM EDTHEAVY RAIN 3.51 Sw Ewing, NJ
Oct 26, 8:00 AM EDTHEAVY RAIN 2.6Mount Holly Wfo, NJ

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, 10.2 hours before the alert went out and 180 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.

326 
WGUS41 KPHI 261009
FLWPHI

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Flood Warning
National Weather Service Mount Holly NJ
609 AM EDT Tue Oct 26 2021

NJC005-021-023-025-029-PAC017-261300-
/O.NEW.KPHI.FA.W.0055.211026T1009Z-211026T1300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Burlington NJ-Mercer NJ-Middlesex NJ-Monmouth NJ-Ocean NJ-Bucks PA-
609 AM EDT Tue Oct 26 2021

The National Weather Service in Mount Holly has issued a

* Flood Warning for...
  Mercer County in central New Jersey...
  Southwestern Monmouth County in central New Jersey...
  Southwestern Middlesex County in northern New Jersey...
  Burlington County in southern New Jersey...
  Western Ocean County in southern New Jersey...
  Southeastern Bucks County in southeastern Pennsylvania...

* Until 900 AM EDT.

* At 609 AM EDT, Doppler radar indicated heavy rain. Flooding is 
  ongoing or expected to begin shortly in the warned area. Between 2 
  and 3 inches of rain have fallen.

* Some locations that may experience flooding include...
  Trenton, Ewing, Medford, Lumberton, Princeton, Florence, 
  Burlington, Bristol, Mount Holly, Tabernacle, Shamong, and 
  Hightstown.

This includes the following highways...
	New Jersey Turnpike between exits 5 and 8.
	Pennsylvania Turnpike between mile markers 351 and 359.
	Interstate 95 in Pennsylvania between mile markers 38 and 40.
	Interstate 295 in New Jersey between mile markers 46 and 76.
	Interstate 195 in New Jersey between mile markers 0 and 14.
	Garden State Parkway between mile markers 56 and 65.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4031 7489 4036 7456 4029 7453 3978 7428
      3965 7425 3958 7424 3957 7424 3956 7423
      3956 7425 3959 7431 3966 7447 3972 7469
      3983 7488 4005 7484 4008 7489 4019 7508
      4031 7491

$$

PO
1 follow-up statement
174 
WGUS81 KPHI 261253
FLSPHI

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

NJC005-021-023-025-029-PAC017-261303-
/O.EXP.KPHI.FA.W.0055.000000T0000Z-211026T1300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Burlington NJ-Mercer NJ-Middlesex NJ-Monmouth NJ-Ocean NJ-Bucks PA-
853 AM EDT Tue Oct 26 2021

...FLOOD WARNING WILL EXPIRE AT 9 AM EDT THIS MORNING FOR MERCER, 
SOUTHWESTERN MONMOUTH, SOUTHWESTERN MIDDLESEX, BURLINGTON, WESTERN 
OCEAN, AND SOUTHEASTERN BUCKS COUNTIES...

Flood waters have receded. The heavy rain has ended. Flooding is no 
longer expected to pose a threat. Please continue to heed remaining 
road closures.

LAT...LON 4031 7489 4036 7456 4029 7453 3978 7428
      3965 7425 3958 7424 3957 7424 3956 7423
      3956 7425 3959 7431 3966 7447 3972 7469
      3983 7488 4005 7484 4008 7489 4019 7508
      4031 7491

$$

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, 4:14 AM EDTFlash Flood WarningPHIHunterdon, Middlesex, Morris, Somerset4 hr
Oct 26, 5:22 AM EDTAreal Flood AdvisoryPHIMorris, Sussex, Warren2 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
Oct 26, 12:31 AM EDTAreal Flood WarningPHIBerks, Chester, Delaware, Montgomery5 hr
Oct 26, 10:27 AM EDTAreal Flood AdvisoryPHIMonroe, Northampton4 hr
Oct 26, 12:20 PM EDTAreal Flood WarningPHICarbon, Monroe, Northampton7 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.