Alert archive / New Jersey / Flash Flood Warnings in 2021

Flash Flood Warning 19, NWS New York, NY

July 17, 2021Union County, New Jersey

NWS New York, NY issued this flash flood warning at Jul 17, 2021, 3:24 PM EDT for Union County, New Jersey. It was in force for 80 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 17, 2021, 3:24 PM EDT (19:24 UTC)
Expired: Jul 17, 2021, 4:44 PM EDT
In force: 80 min
Issued by: NWS New York, NY
Area: Storm-based polygon
Flood severity: None

County Union County, NJ

The radar

The Philadelphia radar (KDIX), 78 km from the middle of the area, began a volume at 19:26 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.

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 7.4 hours before the alert went out and 123 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: 1203 J/kg
Mixed-layer CIN: -55 J/kg
Mixed-layer LCL: 1054 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 35 m²/s²
0-3 km storm-relative helicity: 46 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 1.0

Open this sounding in Storm Lab

The text

As transmitted.

059 
WGUS51 KOKX 171924
FFWOKX
NJC039-172130-
/O.NEW.KOKX.FF.W.0019.210717T1924Z-210717T2130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service New York NY
324 PM EDT Sat Jul 17 2021

The National Weather Service in Upton has issued a

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

* Until 530 PM EDT.

* At 324 PM EDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1 and 1.5 inches of 
  rain have fallen. 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...
  Plainfield, Linden, Clark, Westfield, Rahway, Scotch Plains, 
  Cranford, Roselle, Kenilworth, Fanwood, Mountainside, Garwood and 
  Springfield.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Be aware of your surroundings and do not drive on flooded roads.

Stay away or be swept away. River banks and culverts can become 
unstable and unsafe.

Please report observed flooding to local emergency services or law 
enforcement and request they pass this information to the National 
Weather Service when you can do so safely.

&&

LAT...LON 4060 7443 4073 7435 4072 7433 4072 7432
      4071 7430 4072 7429 4071 7426 4067 7430
      4063 7420 4060 7421 4060 7422 4060 7423
      4060 7424 4060 7426 4059 7429 4060 7430
      4061 7430

FLASH FLOOD...RADAR INDICATED

$$

DS

2 follow-up statements

640 
WGUS71 KOKX 172004
FFSOKX

Flash Flood Statement
National Weather Service New York NY
404 PM EDT Sat Jul 17 2021

NJC039-172130-
/O.CON.KOKX.FF.W.0019.000000T0000Z-210717T2130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Union NJ-
404 PM EDT Sat Jul 17 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 530 PM EDT THIS 
AFTERNOON FOR EASTERN UNION COUNTY...

At 404 PM EDT, Doppler radar indicated thunderstorms producing heavy 
rain across the warned area. Between 1 and 1.5 inches of rain have 
fallen. 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...
  Linden, Clark, Rahway, Cranford, Roselle, Kenilworth and Garwood.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Be aware of your surroundings and do not drive on flooded roads.

Stay away or be swept away. River banks and culverts can become 
unstable and unsafe.

Please report observed flooding to local emergency services or law 
enforcement and request they pass this information to the National 
Weather Service when you can do so safely.

&&

LAT...LON 4061 7434 4071 7430 4072 7429 4071 7426
      4067 7430 4063 7420 4062 7420 4060 7421
      4060 7422 4060 7423 4060 7424 4060 7426
      4059 7428 4059 7429 4060 7430 4061 7430

FLASH FLOOD...RADAR INDICATED

$$

DS

226 
WGUS71 KOKX 172044
FFSOKX

Flash Flood Statement
National Weather Service New York NY
444 PM EDT Sat Jul 17 2021

NJC039-172054-
/O.CAN.KOKX.FF.W.0019.000000T0000Z-210717T2130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Union NJ-
444 PM EDT Sat Jul 17 2021

...FLASH FLOOD WARNING IS CANCELLED FOR EASTERN UNION COUNTY...

The heavy rain has ended in the warned area. Please continue to heed 
remaining road closures.

A Flash Flood Watch remains in effect until 600 AM EDT Sunday for 
portions of southern Connecticut, northeast New Jersey and southeast 
New York.

LAT...LON 4061 7434 4071 7430 4072 7429 4071 7426
      4067 7430 4063 7420 4062 7420 4060 7421
      4060 7422 4060 7423 4060 7424 4060 7426
      4059 7428 4059 7429 4060 7430 4061 7430

$$

DBR

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 17, 1:13 PM EDT	Special Weather Statement	OKX	Hudson	32 min
Jul 17, 1:55 PM EDT	Special Weather Statement	OKX	Hudson	50 min
Jul 17, 2:01 PM EDT	Severe Thunderstorm Warning	OKX	Bergen, Essex, Hudson, Union	44 min
Jul 17, 2:10 PM EDT	Areal Flood Advisory	OKX	Bergen, Essex, Hudson, Union	95 min
Jul 17, 2:20 PM EDT	Flash Flood Warning	OKX	Bergen, Essex, Hudson, Union	3 hr
Jul 17, 2:42 PM EDT	Severe Thunderstorm Warning	OKX	Bergen, Essex, Hudson, Union	33 min
Jul 17, 2:49 PM EDT	Special Weather Statement	OKX	Union	41 min
Jul 17, 2:50 PM EDT	Special Weather Statement	OKX	Bergen, Passaic	55 min
Jul 17, 3:00 PM EDT	Areal Flood Advisory	OKX	Bergen, Essex, Passaic, Union	113 min
Jul 17, 3:18 PM EDT	Severe Thunderstorm Warning	OKX	Essex, Hudson, Union	42 min
Jul 17, 6:40 PM EDT	Special Weather Statement	OKX	Union	50 min
Jul 17, 6:41 PM EDT	Areal Flood Advisory	OKX	Essex, Union	94 min
Jul 17, 7:23 PM EDT	Areal Flood Advisory	OKX	Bergen, Passaic	112 min

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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.