Alert archive / New Jersey / Flash Flood Warnings in 2012

Flash Flood Warning 35, NWS New York, NY

December 21, 2012Bergen County, Passaic County, New Jersey; Orange County, Rockland County, New York

NWS New York, NY issued this flash flood warning at Dec 21, 2012, 9:43 AM EST for Bergen County, Passaic County, New Jersey; Orange County, Rockland County, New York. It was in force for 2 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Dec 21, 2012, 9:43 AM EST (14:43 UTC)
Expired: Dec 21, 2012, 11:45 AM EST
In force: 2 hr
Issued by: NWS New York, NY
Area: Storm-based polygon
Flood severity: None

Counties Bergen County, NJ, Passaic County, NJ, Orange County, NY, Rockland County, NY

The radar

The Brookhaven radar (KOKX), 113 km from the middle of the area, began a volume at 14:42 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, 2.7 hours before the alert went out and 113 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: 6 J/kg
Mixed-layer CIN: -2 J/kg
Mixed-layer LCL: 471 m above ground
0-6 km bulk shear: 78 kt
0-1 km storm-relative helicity: 693 m²/s²
0-3 km storm-relative helicity: 1064 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

473 
WGUS51 KOKX 211443
FFWOKX
NJC003-031-NYC071-087-211645-
/O.NEW.KOKX.FF.W.0035.121221T1443Z-121221T1645Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE NEW YORK NY
943 AM EST FRI DEC 21 2012

THE NATIONAL WEATHER SERVICE IN UPTON NY HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  PASSAIC COUNTY IN NORTHEAST NEW JERSEY...
  NORTHWESTERN BERGEN COUNTY IN NORTHEAST NEW JERSEY...
  ROCKLAND COUNTY IN SOUTHEAST NEW YORK...
  SOUTHERN ORANGE COUNTY IN SOUTHEAST NEW YORK...

* UNTIL 1145 AM EST...

* AT 936 AM EST...LOCAL LAW ENFORCEMENT OFFICIALS IN ROCKLAND COUNTY 
HAVE REPORTED FLASH FLOODING FROM 2 TO 3 INCHES OF RAINFALL THAT 
FELL EARLIER THIS MORNING. RIVER AND STREAMS ACROSS THE WARNED AREA 
CONTINUE TO RISE AND IN SOME CASES MAY EXCEED THEIR BANKFULL. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...HIGHWAYS AND UNDERPASSES. ADDITIONALLY...COUNTRY
ROADS AND FARMLANDS ALONG THE BANKS OF CREEKS...STREAMS AND OTHER LOW
LYING AREAS ARE SUBJECT TO FLOODING.

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY. MOVE TO HIGHER GROUND.

&&

LAT...LON 4120 7437 4121 7438 4138 7424 4141 7396
      4138 7395 4132 7398 4129 7394 4126 7397
      4125 7397 4120 7392 4115 7393 4093 7408
      4101 7436 4108 7449

$$

DSW

2 follow-up statements

865 
WGUS71 KOKX 211554
FFSOKX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE NEW YORK NY
1054 AM EST FRI DEC 21 2012

NJC003-031-NYC071-087-211645-
/O.CON.KOKX.FF.W.0035.000000T0000Z-121221T1645Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
ORANGE NY-ROCKLAND NY-BERGEN NJ-PASSAIC NJ-
1054 AM EST FRI DEC 21 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1145 AM EST FOR
PASSAIC...NORTHWESTERN BERGEN...ROCKLAND AND SOUTHERN ORANGE
COUNTIES...

AT 1041 AM EST...DOPPLER RADAR ALONG WITH SPOTTER REPORTS INDICATE 2 
TO 3 INCHES OF RAINFALL FELL ACROSS PORTIONS OF THE WARNED AREA. 
THIS COMBINED WITH CONTINUED RUNOFF HAS PRODUCED RISING WATERS ON 
AREA RIVERS AND STREAMS WITH SOME LOCATIONS EXCEEDING THEIR BANKFULL.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOST FLOOD DEATHS OCCUR IN AUTOMOBILES. NEVER DRIVE YOUR VEHICLE INTO
AREAS WHERE THE WATER COVERS THE ROADWAY. FLOOD WATERS ARE USUALLY
DEEPER THAN THEY APPEAR. JUST ONE FOOT OF FLOWING WATER IS POWERFUL
ENOUGH TO SWEEP VEHICLES OFF THE ROAD. WHEN ENCOUNTERING FLOODED
ROADS MAKE THE SMART CHOICE...TURN AROUND...DONT DROWN.

&&

LAT...LON 4120 7437 4121 7438 4138 7424 4141 7396
      4138 7395 4132 7398 4129 7394 4126 7397
      4125 7397 4120 7392 4115 7393 4093 7408
      4101 7436 4108 7449

$$

DSW

350 
WGUS71 KOKX 211640
FFSOKX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE NEW YORK NY
1140 AM EST FRI DEC 21 2012

NJC003-031-NYC071-087-211646-
/O.EXP.KOKX.FF.W.0035.000000T0000Z-121221T1645Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
ORANGE NY-ROCKLAND NY-BERGEN NJ-PASSAIC NJ-
1140 AM EST FRI DEC 21 2012

...THE FLASH FLOOD WARNING WILL EXPIRE AT 1145 AM EST FOR PASSAIC...
NORTHWESTERN BERGEN...ROCKLAND AND SOUTHERN ORANGE COUNTIES...

MINOR FLOODING OF SMALLER STREAMS AND RIVERS WILL CONTINUE.


LAT...LON 4120 7437 4121 7438 4138 7424 4141 7396
      4138 7395 4132 7398 4129 7394 4126 7397
      4125 7397 4120 7392 4115 7393 4093 7408
      4101 7436 4108 7449

$$

DSW

The office that day

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

Issued	Product	Office	Counties	Lasted
Dec 20, 8:59 PM EST	High Wind Warning	OKX	Bergen, Essex, Hudson, Union	16 hr
Dec 20, 8:59 PM EST	Wind Advisory	OKX	Bergen, Essex, Passaic, Union	15 hr
Dec 21, 6:33 AM EST	Areal Flood Advisory	OKX	Bergen, Essex, Hudson, Passaic, Union	117 min
Dec 21, 8:29 AM EST	Areal Flood Advisory	OKX	Bergen	91 min
Dec 21, 8:39 AM EST	Areal Flood Advisory	OKX	Passaic	81 min
Dec 21, 10:45 AM EST	River Flood Warning	OKX	Bergen, Passaic	27 hr
Dec 21, 11:47 AM EST	Areal Flood Advisory	OKX	Bergen, Passaic	118 min
Dec 20, 8:05 PM EST	Coastal Flood Advisory	OKX	Bronx, Westchester	11 hr
Dec 20, 9:01 PM EST	Storm Warning	OKX		15 hr
Dec 21, 6:54 AM EST	Areal Flood Advisory	OKX	Westchester	111 min
Dec 21, 9:22 AM EST	Coastal Flood Statement	OKX	Suffolk	3 hr
Dec 21, 11:55 AM EST	Gale Warning	OKX		40 hr
Dec 21, 11:55 AM EST	Small Craft Advisory	OKX		16 hr
Dec 21, 12:05 PM EST	Coastal Flood Statement	OKX	Nassau, Suffolk	6 hr

Nearby

Flash Flood Warnings in New Jersey, 2012 Flash Flood Warnings in New York, 2012 Every flash flood warning in 2012

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.