Alert archive / New Jersey / Flash Flood Warnings in 2012

Flash Flood Warning 31, NWS Philadelphia/Mount Holly

August 9, 2012Middlesex County, New Jersey

NWS Philadelphia/Mount Holly issued this flash flood warning at Aug 9, 2012, 6:17 PM EDT for Middlesex County, New Jersey. It was in force for 88 min. 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: Aug 9, 2012, 6:17 PM EDT (22:17 UTC)
Expired: Aug 9, 2012, 7:45 PM EDT
In force: 88 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Flood severity: None

County Middlesex County, NJ

The radar

The Philadelphia radar (KDIX), 67 km from the middle of the area, began a volume at 22:19 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 9, 6:20 PM EDT	FLASH FLOOD	Woodbridge, NJ	WATER RESCUE IN PROGRESS

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 12:00Z, 10.3 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: 802 J/kg
Mixed-layer CIN: -51 J/kg
Mixed-layer LCL: 932 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 11 m²/s²
0-3 km storm-relative helicity: 33 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.

604 
WGUS51 KPHI 092217
FFWPHI
NJC023-100215-
/O.NEW.KPHI.FF.W.0031.120809T2217Z-120810T0215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
617 PM EDT THU AUG 9 2012

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHEASTERN MIDDLESEX COUNTY...

* UNTIL 1015 PM EDT...

* AT 610 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR ESTIMATES
  AND RAIN GAGE REPORTS INDICATED VERY HEAVY RAIN FROM A THUNDERSTORM
  OVER NORTHEASTERN MIDDLESEX COUNTY. THIS IS THE SAME AREA THAT
  HAS ALREADY RECEIVED AROUND TWO INCHES OF RAIN. 

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO PERTH AMBOY
  AND SOUTH AMBOY.

ADDITIONAL RAINFALL AMOUNTS OF 1 TO 2 INCHES ARE POSSIBLE IN
THE WARNED AREA. THIS FLASH FLOOD WARNING REPLACES THE URBAN AND 
SMALL STREAM FLOOD ADVISORY FOR THE AREA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY.
RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE
PRECAUTIONS TO PROTECT LIFE AND PROPERTY. NEVER ATTEMPT TO CROSS
SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR IN AN
AUTOMOBILE. TURN AROUND DON'T DROWN!

PLEASE REPORT FLOODING...HAIL OR WIND DAMAGE TO THE NATIONAL WEATHER
SERVICE BY CALLING TOLL FREE...1-877-633-6772.

&&

LAT...LON 4056 7421 4055 7424 4048 7426 4045 7422
      4044 7424 4045 7441 4061 7437 4062 7431
      4060 7429 4060 7421 4060 7420

$$

TFG

1 follow-up statement

122 
WGUS71 KPHI 092345 RRA
FFSPHI

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
745 PM EDT THU AUG 9 2012

NJC023-092355-
/O.CAN.KPHI.FF.W.0031.000000T0000Z-120810T0215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MIDDLESEX NJ-
745 PM EDT THU AUG 9 2012

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR NORTHEASTERN
MIDDLESEX COUNTY...

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.

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO PERTH AMBOY
AND SOUTH AMBOY.

LAT...LON 4056 7421 4055 7424 4048 7426 4045 7422
      4044 7424 4045 7441 4061 7437 4062 7431
      4060 7429 4060 7421 4060 7420

$$
 
TFG

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 9, 1:17 PM EDT	Special Marine Warning	PHI		88 min
Aug 9, 1:46 PM EDT	Special Marine Warning	PHI		54 min
Aug 9, 2:01 PM EDT	Special Marine Warning	PHI		119 min
Aug 9, 2:20 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Morris, Warren	70 min
Aug 9, 2:25 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Somerset	65 min
Aug 9, 2:56 PM EDT	Special Weather Statement	PHI	Sussex	94 min
Aug 9, 3:23 PM EDT	Severe Thunderstorm Warning	PHI	Sussex	71 min
Aug 9, 3:35 PM EDT	Special Weather Statement	PHI	Mercer, Middlesex, Morris, Somerset	55 min
Aug 9, 4:18 PM EDT	Special Weather Statement	PHI	Hunterdon	57 min
Aug 9, 4:33 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Mercer, Somerset	57 min
Aug 9, 4:57 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Mercer, Middlesex, Monmouth	78 min
Aug 9, 5:06 PM EDT	Areal Flood Advisory	PHI	Hunterdon, Mercer, Somerset	3 hr
Aug 9, 5:08 PM EDT	Special Weather Statement	PHI	Mercer, Middlesex, Monmouth	2 hr
Aug 9, 5:26 PM EDT	Flash Flood Warning	PHI	Hunterdon, Mercer	2 hr
Aug 9, 5:48 PM EDT	Areal Flood Advisory	PHI	Middlesex	2 hr

Nearby

Flash Flood Warnings in New Jersey, 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.