Alert archive / New Jersey / Flash Flood Warnings in 2021

Flash Flood Warning 49, NWS New York, NY

October 25, 2021Bergen County, New Jersey; Rockland County, New York

NWS New York, NY issued this flash flood warning at Oct 25, 2021, 10:33 PM EDT for Bergen County, New Jersey; Rockland County, New York. It was in force for 3 hr. 1 report 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 25, 2021, 10:33 PM EDT (02:33 UTC)
Expired: Oct 26, 2021, 1:45 AM EDT
In force: 3 hr
Issued by: NWS New York, NY
Area: Storm-based polygon
Flood severity: None

Counties Bergen County, NJ, Rockland County, NY

The radar

The Brookhaven radar (KOKX), 112 km from the middle of the area, began a volume at 02:37 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
Oct 25, 11:15 PM EDT	FLASH FLOOD	Chestnut Ridge, NY	CHESTNUT RIDGE ROAD ALL LANES CLOSED 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 00:00Z, 2.6 hours before the alert went out and 112 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: 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.

114 
WGUS51 KOKX 260233
FFWOKX
NJC003-NYC087-260545-
/O.NEW.KOKX.FF.W.0049.211026T0233Z-211026T0545Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service New York NY
1033 PM EDT Mon Oct 25 2021

The National Weather Service in Upton has issued a

* Flash Flood Warning for...
  Northwestern Bergen County in northeastern New Jersey...
  Rockland County in southeastern New York...

* Until 145 AM EDT.

* At 1033 PM EDT, Doppler radar and automated rain gauges indicated 
  thunderstorms producing heavy rain across the warned area. Between 
  1 and 2 inches of rain have fallen. The expected rainfall rate is 
  1 to 2 inches in 1 hour. Additional rainfall amounts of 0.5 to 1 
  inch are possible in the warned area. Flash flooding is ongoing or 
  expected to begin shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Radar and automated gauges.

  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 could experience flash flooding include...
  Monsey, Ramsey, Suffern, Spring Valley, Wyckoff, Oakland, Franklin 
  Lakes, Waldwick, Airmont, Upper Saddle River, Chestnut Ridge, 
  Hillcrest, Midland Park, Viola, Allendale, Wesley Hills, 
  Montebello and Saddle River.

This includes the following streams and drainages...
  Fyke Brook, Saddle Brook, Saddle River, Mahwah River, Bear Brook, 
  Hackensack River, Valentine Brook, Bear Swamp Brook, Ramapo River, 
  West Branch Saddle River, Molly Ann Brook, Passaic River, 
  Masonicus Brook, Pleasant Brook, Ramsey Brook and Darlington Brook.

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.

&&

LAT...LON 4117 7408 4112 7402 4097 7414 4097 7415
      4098 7416 4098 7417 4098 7418 4098 7420
      4098 7421 4098 7422 4099 7425 4100 7425
      4101 7426 4102 7427 4103 7427 4106 7425

FLASH FLOOD...RADAR AND GAUGE INDICATED
EXPECTED RAINFALL...1-2 INCHES IN 1 HOUR

$$

Goodman

1 follow-up statement

085 
WGUS71 KOKX 260540
FFSOKX

Flash Flood Statement
National Weather Service New York NY
140 AM EDT Tue Oct 26 2021

NJC003-NYC087-260550-
/O.EXP.KOKX.FF.W.0049.000000T0000Z-211026T0545Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Bergen NJ-Rockland NY-
140 AM EDT Tue Oct 26 2021

...FLASH FLOOD WARNING WILL EXPIRE AT 145 AM EDT EARLY THIS MORNING 
FOR NORTHWESTERN BERGEN AND ROCKLAND COUNTIES...

Flooding is no longer expected to pose a threat. Please continue to 
heed remaining road closures.

A Flash Flood Watch remains in effect until 500 PM EDT Tuesday for 
portions of southern Connecticut, northeast New Jersey and southeast 
New York.

LAT...LON 4117 7408 4112 7402 4097 7414 4097 7415
      4098 7416 4098 7417 4098 7418 4098 7420
      4098 7421 4098 7422 4099 7425 4100 7425
      4101 7426 4102 7427 4103 7427 4106 7425

$$

BC

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 25, 9:42 PM EDT	Flash Flood Warning	OKX	Essex, Passaic	3 hr
Oct 26, 3:12 AM EDT	Areal Flood Advisory	OKX	Bergen, Essex, Hudson, Passaic, Union	5 hr
Oct 26, 6:03 AM EDT	Areal Flood Advisory	OKX	Bergen, Passaic	3 hr
Oct 26, 7:39 AM EDT	Flash Flood Warning	OKX	Bergen, Essex, Hudson, Passaic, Union	3 hr
Oct 26, 10:05 AM EDT	River Flood Warning	OKX	Bergen	14 hr
Oct 26, 10:38 AM EDT	Areal Flood Advisory	OKX	Bergen, Essex, Hudson, Passaic	112 min
Oct 26, 1:45 PM EDT	River Flood Warning	OKX	Bergen, Passaic	36 hr
Oct 26, 2:58 PM EDT	Areal Flood Advisory	OKX	Bergen	3 hr
Oct 26, 7:11 PM EDT	Areal Flood Advisory	OKX	Bergen, Essex, Hudson, Passaic, Union	3 hr
Oct 25, 10:44 PM EDT	Special Weather Statement	OKX	Rockland	46 min
Oct 25, 11:08 PM EDT	Special Weather Statement	OKX	Bronx, Westchester	37 min
Oct 26, 1:38 AM EDT	Areal Flood Advisory	OKX	Suffolk	3 hr
Oct 26, 1:52 AM EDT	Areal Flood Advisory	OKX	Kings, Queens	6 hr
Oct 26, 4:12 AM EDT	High Wind Warning	OKX	Suffolk	32 hr
Oct 26, 5:01 AM EDT	Areal Flood Advisory	OKX	Nassau, Queens, Suffolk	3 hr
Oct 26, 7:31 AM EDT	Areal Flood Advisory	OKX	Suffolk	119 min
Oct 26, 7:54 AM EDT	Areal Flood Advisory	OKX	Bronx, Kings, New York, Queens, Richmond	4 hr
Oct 26, 7:58 AM EDT	Areal Flood Advisory	OKX	Nassau, Suffolk	3 hr
Oct 26, 9:08 AM EDT	Areal Flood Advisory	OKX	Orange, Rockland, Westchester	112 min
Oct 26, 9:26 AM EDT	Special Weather Statement	OKX	Nassau, Suffolk	94 min
Oct 26, 3:21 PM EDT	Areal Flood Advisory	OKX	Suffolk	114 min
Oct 26, 3:36 PM EDT	Areal Flood Advisory	OKX	Orange, Putnam, Rockland, Westchester	2 hr
Oct 26, 4:52 PM EDT	Coastal Flood Statement	OKX	Nassau, Queens, Suffolk	22 hr
Oct 26, 4:52 PM EDT	Coastal Flood Advisory	OKX	Nassau, Suffolk	26 hr

Nearby

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