Alert archive / New Jersey / Flash Flood Warnings in 2012

Flash Flood Warning 23, NWS Philadelphia/Mount Holly

August 1, 2012Middlesex County, Somerset County, New Jersey

NWS Philadelphia/Mount Holly issued this flash flood warning at Aug 1, 2012, 2:39 PM EDT for Middlesex County, Somerset County, New Jersey. It was in force for 3 hr. 2 reports 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 1, 2012, 2:39 PM EDT (18:39 UTC)
Expired: Aug 1, 2012, 6:01 PM EDT
In force: 3 hr
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Flood severity: None

Counties Middlesex County, NJ, Somerset County, NJ

The radar

The Philadelphia radar (KDIX), 73 km from the middle of the area, began a volume at 18:40 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 1, 4:00 PM EDT	FLASH FLOOD	Hillsborough, NJ	FLASH FLOOD REPORTED ON CAIN DR.
Aug 1, 4:31 PM EDT	FLASH FLOOD	Millstone, NJ	FLOODING REPORTING ON MAIN AND YORKTOWN ROADS

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, 6.7 hours before the alert went out and 138 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: 140 J/kg
Mixed-layer CIN: -61 J/kg
Mixed-layer LCL: 893 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: 70 m²/s²
0-3 km storm-relative helicity: 85 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.

411 
WGUS51 KPHI 011839
FFWPHI
NJC023-035-012245-
/O.NEW.KPHI.FF.W.0023.120801T1839Z-120801T2245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
239 PM EDT WED AUG 1 2012

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOMERSET COUNTY...
  NORTHWESTERN MIDDLESEX COUNTY...

* UNTIL 645 PM EDT...

* AT 235 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  VERY HEAVY RAIN FROM A CLUSTER OF THUNDERSTORMS OVER NORTHWESTERN 
  MIDDLESEX AND SOMERSET COUNTIES. AS MUCH AS TWO AND ONE-HALF INCHES
  OF RAIN MAY HAVE FALLEN SO FAR IN PARTS OF THE WARNED AREA.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO NEW
  BRUNSWICK AND SOMERVILLE.

ADDITIONAL RAINFALL AMOUNTS OF 2 INCHES ARE POSSIBLE IN THE WARNED 
AREA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4056 7429 4040 7456 4051 7472 4070 7454
      4069 7453 4065 7452 4066 7448 4063 7441
      4061 7443 4061 7437

$$

HAYES

2 follow-up statements

884 
WGUS71 KPHI 011941
FFSPHI

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
341 PM EDT WED AUG 1 2012

NJC023-035-012245-
/O.CON.KPHI.FF.W.0023.000000T0000Z-120801T2245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SOMERSET NJ-MIDDLESEX NJ-
341 PM EDT WED AUG 1 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 645 PM EDT FOR
NORTHWESTERN MIDDLESEX AND SOMERSET COUNTIES...

AT 340 PM EDT...DOPPLER RADAR ESTIMATES CONTINUE TO INDICATE SHOWERS 
AND THUNDERSTORMS WITH VERY HEAVY RAIN OVER PORTIONS OF NORTHWESTERN 
MIDDLESEX AND SOMERSET COUNTIES. DOPPLER RADAR INDICATES THAT AS 
MUCH AS 4 INCHES OF RAIN HAS FALLEN WITH THE STORMS NEAR MILLSTONE. 

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO NEW BRUNSWICK
AND SOMERVILLE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...URBAN AREAS...HIGHWAYS...STREETS AND UNDERPASSES
AS WELL AS OTHER DRAINAGE AREAS AND LOW LYING SPOTS.

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.

PLEASE REPORT FLOODING...HAIL OR WIND DAMAGE BY CALLING YOUR LOCAL
LAW ENFORCEMENT OFFICIALS OR BY CALLING THE NATIONAL WEATHER SERVICE
TOLL FREE AT...1-877-633-6772.

&&

LAT...LON 4056 7429 4040 7456 4051 7472 4070 7454
      4069 7453 4065 7452 4066 7448 4063 7441
      4061 7443 4061 7437

$$

HAYES

066 
WGUS71 KPHI 012201
FFSPHI

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
601 PM EDT WED AUG 1 2012

NJC023-035-012211-
/O.CAN.KPHI.FF.W.0023.000000T0000Z-120801T2245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SOMERSET NJ-MIDDLESEX NJ-
601 PM EDT WED AUG 1 2012

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR NORTHWESTERN
MIDDLESEX AND SOMERSET 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.

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO NEW BRUNSWICK
AND SOMERVILLE.

LAT...LON 4056 7429 4040 7456 4051 7472 4070 7454
      4069 7453 4065 7452 4066 7448 4063 7441
      4061 7443 4061 7437

$$

HAYES

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 31, 9:51 PM EDT	Coastal Flood Statement	PHI	Burlington, Camden, Gloucester	5 hr
Aug 1, 9:24 AM EDT	Coastal Flood Advisory	PHI	Atlantic, Burlington, Cape May, Cumberland, Middlesex, Monmouth and 1 more	15 hr
Aug 1, 9:44 AM EDT	Areal Flood Advisory	PHI	Cumberland	2 hr
Aug 1, 10:48 AM EDT	Special Weather Statement	PHI	Cumberland	57 min
Aug 1, 10:59 AM EDT	Areal Flood Advisory	PHI	Cumberland	73 min
Aug 1, 12:09 PM EDT	Areal Flood Advisory	PHI	Monmouth, Ocean	3 hr
Aug 1, 12:48 PM EDT	Areal Flood Advisory	PHI	Cape May	107 min
Aug 1, 1:09 PM EDT	Special Weather Statement	PHI	Cape May	66 min
Aug 1, 1:16 PM EDT	Areal Flood Advisory	PHI	Atlantic, Burlington, Camden, Ocean	3 hr
Aug 1, 1:45 PM EDT	Special Weather Statement	PHI	Somerset	60 min
Aug 1, 2:12 PM EDT	Areal Flood Advisory	PHI	Middlesex, Morris, Somerset	3 hr
Aug 1, 2:27 PM EDT	Special Weather Statement	PHI	Hunterdon, Mercer	63 min
Aug 1, 2:47 PM EDT	Areal Flood Advisory	PHI	Hunterdon, Mercer	3 hr
Aug 1, 2:57 PM EDT	Special Weather Statement	PHI	Ocean	63 min
Aug 1, 3:12 PM EDT	Special Weather Statement	PHI	Hunterdon	63 min
Aug 1, 3:25 PM EDT	Areal Flood Advisory	PHI	Hunterdon, Morris, Somerset	3 hr
Aug 1, 3:31 PM EDT	Coastal Flood Statement	PHI	Burlington, Camden, Gloucester, Salem	11 hr
Aug 1, 3:51 PM EDT	Flash Flood Warning	PHI	Hunterdon, Morris	2 hr
Aug 1, 4:11 PM EDT	Areal Flood Advisory	PHI	Burlington, Ocean	65 min
Aug 1, 4:41 PM EDT	Special Weather Statement	PHI	Sussex	64 min
Aug 1, 5:26 PM EDT	Areal Flood Advisory	PHI	Sussex	102 min
Aug 1, 5:41 PM EDT	Special Weather Statement	PHI	Camden, Gloucester	64 min
Aug 1, 5:46 PM EDT	Severe Thunderstorm Warning	PHI	Camden, Gloucester	31 min
Aug 1, 6:16 PM EDT	Areal Flood Advisory	PHI	Burlington, Camden, Gloucester	46 min

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.