Alert archive / New Jersey / Flash Flood Warnings in 2021

Flash Flood Warning 46, NWS New York, NY

September 23, 2021Essex County, Passaic County, Union County, New Jersey

NWS New York, NY issued this flash flood warning at Sep 23, 2021, 5:14 PM EDT for Essex County, Passaic County, Union County, New Jersey. It was in force for 3 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 23, 2021, 5:14 PM EDT (21:14 UTC)
Expired: Sep 23, 2021, 7:56 PM EDT
In force: 3 hr
Issued by: NWS New York, NY
Area: Storm-based polygon
Flood severity: None

Counties Essex County, NJ, Passaic County, NJ, Union County, NJ

The radar

The Philadelphia radar (KDIX), 104 km from the middle of the area, began a volume at 21:16 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

Time	Report	Where	Remark
Sep 23, 6:15 PM EDT	FLASH FLOOD	1 Ssw Rahway, NJ	W INMAN AVE CLOSED NEAR NEW BRUNSWICK AVE DUE TO FLOODING.
Sep 23, 6:15 PM EDT	FLASH FLOOD	Springfield, NJ	MEISEL AVE CLOSED BETWEEN WABENO AVE AND SOUTH SPRINGFIELD AVE DUE TO FLOODING.

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 12:00Z, 9.2 hours before the alert went out and 122 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 103 J/kg
Mixed-layer CIN: -11 J/kg
Mixed-layer LCL: 687 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 249 m²/s²
0-3 km storm-relative helicity: 201 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 1.1

Open this sounding in Storm Lab

The text

As transmitted.

973 
WGUS51 KOKX 232114
FFWOKX
NJC013-031-039-240200-
/O.NEW.KOKX.FF.W.0046.210923T2114Z-210924T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service New York NY
514 PM EDT Thu Sep 23 2021

The National Weather Service in Upton has issued a

* Flash Flood Warning for...
  Essex County in northeastern New Jersey...
  Passaic County in northeastern New Jersey...
  Union County in northeastern New Jersey...

* Until 1000 PM EDT.

* At 514 PM EDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Flash flooding is ongoing or 
  expected to begin shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Radar.

  IMPACT...Flash flooding of small creeks and streams, urban
           areas, highways, streets and underpasses as well as
           other poor drainage and low-lying areas.

* Some locations that will experience flash flooding include...
  Newark, Paterson, Elizabeth, Passaic, Wayne, Plainfield, 
  Bloomfield, Linden, Orange, West Milford, Summit, Millburn, 
  Harrison, Ringwood, Pompton Lakes, Caldwell, Hawthorne, Clark, 
  Bloomingdale and Fairfield.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4075 7436 4091 7433 4091 7427 4100 7430
      4102 7443 4105 7445 4104 7450 4109 7450
      4120 7437 4113 7421 4102 7427 4097 7414
      4086 7411 4075 7417 4074 7412 4070 7411
      4059 7420 4060 7446 4066 7440 4067 7446

FLASH FLOOD...RADAR INDICATED

$$

JMC

1 follow-up statement

745 
WGUS71 KOKX 232356
FFSOKX

Flash Flood Statement
National Weather Service New York NY
756 PM EDT Thu Sep 23 2021

NJC013-031-039-240006-
/O.CAN.KOKX.FF.W.0046.000000T0000Z-210924T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Essex NJ-Passaic NJ-Union NJ-
756 PM EDT Thu Sep 23 2021

...FLASH FLOOD WARNING IS CANCELLED FOR ESSEX, PASSAIC AND UNION 
COUNTIES...

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

A Flash Flood Watch remains in effect until 800 AM EDT Friday for 
portions of southern Connecticut, northeast New Jersey and southeast 
New York.

LAT...LON 4075 7436 4091 7433 4091 7427 4100 7430
      4102 7443 4105 7445 4104 7450 4109 7450
      4120 7437 4113 7421 4102 7427 4097 7414
      4086 7411 4075 7417 4074 7412 4070 7411
      4059 7420 4060 7446 4066 7440 4067 7446

$$

JMC

The office that day

Everything else NWS New York, NY issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Sep 23, 4:33 PM EDT	Special Weather Statement	OKX	Essex, Passaic, Union	42 min
Sep 23, 4:59 PM EDT	Areal Flood Advisory	OKX	Essex, Passaic, Union	15 min
Sep 23, 5:19 PM EDT	Special Weather Statement	OKX	Bergen, Essex, Hudson, Passaic, Union	56 min
Sep 23, 5:27 PM EDT	Areal Flood Advisory	OKX	Bergen, Hudson	5 hr

Nearby

Flash Flood Warnings in New Jersey, 2021 Every 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.