Alert archive / New Jersey / Flash Flood Warnings in 2021

Flash Flood Warning 25, NWS New York, NY

August 22, 2021Essex County, Passaic County, New Jersey

NWS New York, NY issued this flash flood warning at Aug 22, 2021, 12:18 AM EDT for Essex County, Passaic County, New Jersey. It was in force for 2 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: Aug 22, 2021, 12:18 AM EDT (04:18 UTC)
Expired: Aug 22, 2021, 2:43 AM EDT
In force: 2 hr
Issued by: NWS New York, NY
Area: Storm-based polygon
Flood severity: None

Counties Essex County, NJ, Passaic County, NJ

The radar

The Philadelphia radar (KDIX), 103 km from the middle of the area, began a volume at 04:21 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
Aug 22, 12:38 AM EDT	FLASH FLOOD	Clifton, NJ	NJ ROUTE 3 WESTBOUND ALL LANES CLOSED.
Aug 22, 1:31 AM EDT	FLASH FLOOD	1 Nnw Orange, NJ	FLOODING ON I-280 EASTBOUND RAMP TO EXIT 10 - NORTHFIELD AVE/CR 508. ALL LANES CLOSED.

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, 4.3 hours before the alert went out and 117 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: 1163 J/kg
Mixed-layer CIN: -6 J/kg
Mixed-layer LCL: 543 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 75 m²/s²
0-3 km storm-relative helicity: 85 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 1.7

Open this sounding in Storm Lab

The text

As transmitted.

150 
WGUS51 KOKX 220418
FFWOKX
NJC013-031-220730-
/O.NEW.KOKX.FF.W.0025.210822T0418Z-210822T0730Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service New York NY
1218 AM EDT Sun Aug 22 2021

The National Weather Service in Upton has issued a

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

* Until 330 AM EDT.

* At 1218 AM EDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1 and 2 inches of rain 
  have fallen. Additional rainfall amounts of 1 to 3 inches are 
  possible in 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...
  Paterson, Passaic, Wayne, Orange, Millburn, Caldwell, Hawthorne, 
  Fairfield, Clifton, West Orange, Montclair, Livingston, Maplewood, 
  South Orange, Little Falls, Verona, Cedar Grove, Woodland Park, 
  Totowa and West Caldwell.

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 4100 7430 4097 7414 4089 7413 4086 7411
      4086 7412 4082 7412 4084 7419 4072 7426
      4072 7433 4074 7437 4079 7437 4082 7433
      4086 7432 4087 7434 4091 7433 4090 7428
      4091 7427 4093 7429 4097 7428

FLASH FLOOD...RADAR INDICATED

$$

MW

1 follow-up statement

561 
WGUS71 KOKX 220643
FFSOKX

Flash Flood Statement
National Weather Service New York NY
243 AM EDT Sun Aug 22 2021

NJC013-031-220653-
/O.CAN.KOKX.FF.W.0025.000000T0000Z-210822T0730Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Essex NJ-Passaic NJ-
243 AM EDT Sun Aug 22 2021

...FLASH FLOOD WARNING IS CANCELLED FOR ESSEX AND EASTERN PASSAIC 
COUNTIES...

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

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

LAT...LON 4100 7430 4097 7414 4089 7413 4086 7411
      4086 7412 4082 7412 4084 7419 4072 7426
      4072 7433 4074 7437 4079 7437 4082 7433
      4086 7432 4087 7434 4091 7433 4090 7428
      4091 7427 4093 7429 4097 7428

$$

MW

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 21, 9:03 PM EDT	Areal Flood Advisory	OKX	Bergen, Essex, Hudson, Passaic, Union	87 min
Aug 21, 10:18 PM EDT	Flash Flood Warning	OKX	Bergen, Essex, Hudson	4 hr
Aug 21, 10:37 PM EDT	Areal Flood Advisory	OKX	Bergen	83 min
Aug 22, 1:22 AM EDT	Flash Flood Warning	OKX	Union	117 min
Aug 22, 2:49 AM EDT	Areal Flood Advisory	OKX	Bergen, Essex, Hudson, Passaic	86 min
Aug 22, 4:11 AM EDT	River Flood Warning	OKX	Bergen	34 hr
Aug 22, 2:44 PM EDT	Flash Flood Warning	OKX	Bergen, Essex, Hudson, Passaic, Union	3 hr
Aug 22, 4:51 PM EDT	Flash Flood Warning Considerable damage threat	OKX	Bergen, Essex, Passaic	6 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.