Alert archive / New Jersey / Flash Flood Warnings in 2013

Flash Flood Warning 62, NWS Philadelphia/Mount Holly

August 22, 2013Mercer County, Middlesex County, Somerset County, New Jersey

NWS Philadelphia/Mount Holly issued this flash flood warning at Aug 22, 2013, 1:20 PM EDT for Mercer County, Middlesex County, Somerset County, New Jersey. It was in force for 4 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: Aug 22, 2013, 1:20 PM EDT (17:20 UTC)
Expired: Aug 22, 2013, 5:15 PM EDT
In force: 4 hr
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Flood severity: None

Counties Mercer County, NJ, Middlesex County, NJ, Somerset County, NJ

The radar

The Philadelphia radar (KDIX), 50 km from the middle of the area, began a volume at 17:21 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.

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 5.3 hours before the alert went out and 153 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: 1014 J/kg
Mixed-layer CIN: -27 J/kg
Mixed-layer LCL: 632 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 71 m²/s²
0-3 km storm-relative helicity: 70 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.

842 
WGUS51 KPHI 221720
FFWPHI
NJC021-023-035-222115-
/O.NEW.KPHI.FF.W.0062.130822T1720Z-130822T2115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
120 PM EDT THU AUG 22 2013

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHERN MERCER COUNTY...
  SOUTHERN SOMERSET COUNTY...
  CENTRAL MIDDLESEX COUNTY...

* UNTIL 515 PM EDT...

* AT 109 PM EDT...LOCAL LAW ENFORCEMENT OFFICIALS REPORTED FLASH     
  FLOODING FROM THUNDERSTORMS OVER CENTRAL MIDDLESEX...NORTHERN      
  MERCER AND SOUTHERN SOMERSET COUNTIES.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO PRINCETON  
  JUNCTION, THE BRUNSWICK'S, OLD BRIDGE, AND SAYREVILLE.

THE STORMS ARE PRODUCING UP TO TWO INCHES OF RAINFALL PER HOUR.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DRIVING INTO FLOOD WATERS COULD COST YOU YOUR LIFE...OR AT THE VERY
LEAST...THOUSANDS OF DOLLARS OF VEHICLE DAMAGE. NEARLY HALF OF ALL
FLASH FLOOD FATALITIES ARE AUTO RELATED. TURN AROUND...DON'T DROWN.

&&

LAT...LON 4033 7446 4031 7458 4032 7484 4038 7476
      4040 7467 4051 7444 4048 7426

$$

KRUZDLO

1 follow-up statement

183 
WGUS71 KPHI 221926
FFSPHI

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
326 PM EDT THU AUG 22 2013

NJC021-023-035-221936-
/O.CAN.KPHI.FF.W.0062.000000T0000Z-130822T2115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MERCER NJ-SOMERSET NJ-MIDDLESEX NJ-
326 PM EDT THU AUG 22 2013

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR CENTRAL
MIDDLESEX...SOUTHEASTERN SOMERSET AND NORTHERN MERCER COUNTIES...

THE WATERS FROM THE EARLIER HEAVY RAINS ARE RECEDING AND FLOOD WATERS
NO LONGER POSE A THREAT TO LIFE OR PROPERTY. THEREFORE...THE FLASH
FLOOD WARNING HAS BEEN CANCELLED.

LAT...LON 4033 7446 4031 7458 4032 7484 4038 7476
      4040 7467 4051 7444 4048 7426

$$

KRUZDLO

The office that day

Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 22, 7:24 AM EDT	Special Weather Statement	PHI	Mercer, Middlesex, Somerset	66 min
Aug 22, 7:48 AM EDT	Areal Flood Advisory	PHI	Burlington, Mercer	117 min
Aug 22, 8:28 AM EDT	Special Weather Statement	PHI	Middlesex, Somerset	62 min
Aug 22, 8:59 AM EDT	Areal Flood Advisory	PHI	Hunterdon, Morris, Somerset	2 hr
Aug 22, 10:10 AM EDT	Flash Flood Warning	PHI	Hunterdon, Morris, Somerset	5 hr
Aug 22, 11:27 AM EDT	Special Weather Statement	PHI	Hunterdon, Somerset	2 hr
Aug 22, 12:18 PM EDT	Areal Flood Advisory	PHI	Hunterdon, Mercer, Somerset	4 hr
Aug 22, 12:37 PM EDT	Areal Flood Advisory	PHI	Mercer, Middlesex, Somerset	4 hr
Aug 22, 1:28 PM EDT	Areal Flood Advisory	PHI	Burlington, Camden, Mercer	4 hr
Aug 22, 1:39 PM EDT	Special Weather Statement	PHI	Monmouth	81 min
Aug 22, 1:41 PM EDT	Areal Flood Advisory	PHI	Middlesex, Monmouth	4 hr
Aug 22, 2:06 PM EDT	Areal Flood Advisory	PHI	Burlington, Mercer, Monmouth, Ocean	4 hr
Aug 22, 3:03 PM EDT	Areal Flood Warning	PHI	Hunterdon, Somerset	8 hr
Aug 22, 3:23 PM EDT	Special Weather Statement	PHI	Camden, Gloucester	97 min
Aug 22, 3:46 PM EDT	Special Weather Statement	PHI	Camden, Gloucester	89 min
Aug 22, 3:47 PM EDT	Areal Flood Advisory	PHI	Burlington, Camden, Gloucester, Salem	4 hr
Aug 22, 4:26 PM EDT	Special Weather Statement	PHI	Atlantic	94 min
Aug 22, 4:42 PM EDT	Special Marine Warning	PHI		93 min
Aug 22, 5:16 PM EDT	Special Weather Statement	PHI	Warren	89 min
Aug 22, 6:43 PM EDT	Special Weather Statement	PHI	Cape May	92 min
Aug 22, 6:53 PM EDT	Special Marine Warning	PHI		97 min

Nearby

Flash Flood Warnings in New Jersey, 2013 Every flash flood warning in 2013

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.