Alert archive / New Jersey / Flash Flood Warnings in 2021

Flash Flood Warning 90, NWS Philadelphia/Mount Holly

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

NWS Philadelphia/Mount Holly issued this flash flood warning at Oct 26, 2021, 2:08 AM EDT for 5 counties in New Jersey; Bucks County, Pennsylvania. It was in force for 4 hr. 3 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, 2:08 AM EDT (06:08 UTC)
Expired
Oct 26, 2021, 6:09 AM EDT
In force
4 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), 14 km from the middle of the area, began a volume at 06:08 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, 5:30 AM EDTFLASH FLOOD1 Nnw East Windsor Twp, NJOLD TRENTON ROAD AT ANCIL DAVIDSON ROAD PARTIALLY CLOSED DUE TO FLOODING. TIME ESTIMATED FROM RADAR.
Oct 26, 5:30 AM EDTFLASH FLOOD1 Nw Princeton Junction, NJWASHINGTON ROAD CLOSED BETWEEN U.S. HIGHWAY 1 AND CRANBURY ROAD FROM FLOODING. TIME ESTIMATED FROM RADAR.
Oct 26, 5:30 AM EDTFLASH FLOOD2 W Cranbury, NJPETTY ROAD BRIDGE CLOSED DUE TO FLOODING. TIME ESTIMATED FROM RADAR.

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, 6.1 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.

279 
WGUS51 KPHI 260608
FFWPHI
NJC005-021-023-025-029-PAC017-261015-
/O.NEW.KPHI.FF.W.0090.211026T0608Z-211026T1015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

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

The National Weather Service in Mount Holly has issued a

* Flash 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 615 AM EDT.

* At 208 AM EDT, Doppler radar indicated heavy rain across the 
  warned area. Between 1 and 2 inches of rain have fallen. 
  Additional rainfall amounts of 1.5 to 2.5 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...
  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 47 and 76.
	Interstate 195 in New Jersey between mile markers 0 and 13.
	Garden State Parkway between mile markers 56 and 64.

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 4036 7456 3978 7428 3958 7424 3957 7424
      3956 7423 3956 7425 3959 7431 3966 7447
      3972 7469 3983 7488 4005 7484 4019 7508
      4031 7491

FLASH FLOOD...RADAR INDICATED

$$

PO
2 follow-up statements
408 
WGUS71 KPHI 260730
FFSPHI

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

NJC005-021-023-025-029-PAC017-261015-
/O.CON.KPHI.FF.W.0090.000000T0000Z-211026T1015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Burlington NJ-Mercer NJ-Middlesex NJ-Monmouth NJ-Ocean NJ-Bucks PA-
330 AM EDT Tue Oct 26 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 615 AM EDT THIS 
MORNING FOR MERCER, SOUTHWESTERN MONMOUTH, SOUTHWESTERN MIDDLESEX, 
BURLINGTON, WESTERN OCEAN, AND SOUTHEASTERN BUCKS COUNTIES...

At 330 AM EDT, Doppler radar indicated heavy rain across the warned 
area. Between 1.5 and 3 inches of rain have fallen. Additional 
rainfall amounts of 0.5 to 1.5 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...
  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.

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 4036 7456 3978 7428 3958 7424 3957 7424
      3956 7423 3956 7425 3959 7431 3966 7447
      3972 7469 3983 7488 4005 7484 4019 7508
      4031 7491

FLASH FLOOD...RADAR INDICATED

$$

CMS
325 
WGUS71 KPHI 261009
FFSPHI

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

NJC005-021-023-025-029-PAC017-261019-
/O.CAN.KPHI.FF.W.0090.000000T0000Z-211026T1015Z/
/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

...FLASH FLOOD WARNING FOR MERCER, SOUTHWESTERN MONMOUTH, 
SOUTHWESTERN MIDDLESEX, BURLINGTON, WESTERN OCEAN, AND SOUTHEASTERN 
BUCKS COUNTIES HAS BEEN REPLACED WITH A FLOOD WARNING...

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

$$

PO

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, 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, 6:09 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
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

Flash Flood Warnings in New Jersey, 2021Flash Flood Warnings in Pennsylvania, 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.