Alert archive / New Jersey / Flash Flood Warnings in 2014

Flash Flood Warning 55, NWS Philadelphia/Mount Holly

August 21, 2014Middlesex County, Somerset County, New Jersey

NWS Philadelphia/Mount Holly issued this flash flood warning at Aug 21, 2014, 11:24 PM EDT for 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 21, 2014, 11:24 PM EDT (03:24 UTC)
Expired
Aug 22, 2014, 3:30 AM EDT
In force
4 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), 76 km from the middle of the area, began a volume at 03:24 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 00:00Z, 3.4 hours before the alert went out and 144 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-pSkew-T log-p diagram, Brookhaven, NY at 00:00Z on 2014-08-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Brookhaven, NY at 00:00Z on 2014-08-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 24 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1021 m above ground
0-6 km bulk shear
25 kt
0-1 km storm-relative helicity
24 m²/s²
0-3 km storm-relative helicity
88 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.

855 
WGUS51 KPHI 220324
FFWPHI
NJC023-035-220730-
/O.NEW.KPHI.FF.W.0055.140822T0324Z-140822T0730Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1124 PM EDT THU AUG 21 2014

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTH CENTRAL MIDDLESEX COUNTY IN NORTHERN NEW JERSEY...
  NORTHERN SOMERSET COUNTY IN NORTHERN NEW JERSEY...
  THIS INCLUDES THE CITY OF SOMERVILLE...

* UNTIL 330 AM EDT

* AT 1119 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  VERY HEAVY RAIN FROM A THUNDERSTORM OVER THE WARNED AREA.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO FAR
  HILLS...PEAPACK AND GLADSTONE AND BASKING RIDGE

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SOME LOCATIONS IN THE WARNED AREA HAVE ALREADY SEEN OVER 2 INCHES OF 
RAIN. THUS...ANY ADDITIONAL RAIN WILL QUICKLY BECOME RUNOFF AND 
COULD LEAD TO FLASH FLOODING. ADDITIONAL RAINFALL AMOUNTS OF AROUND 
ONE INCH ARE POSSIBLE IN THE WARNED AREA.

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 4051 7434 4048 7465 4053 7473 4062 7470
      4064 7473 4067 7473 4073 7470 4076 7455
      4070 7451 4068 7453 4065 7452 4067 7446
      4067 7440 4060 7444 4061 7431

$$

SFJ
2 follow-up statements
511 
WGUS71 KPHI 220446
FFSPHI

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1246 AM EDT FRI AUG 22 2014

NJC023-035-220730-
/O.CON.KPHI.FF.W.0055.000000T0000Z-140822T0730Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SOMERSET NJ-MIDDLESEX NJ-
1246 AM EDT FRI AUG 22 2014

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 330 AM EDT FOR NORTH
CENTRAL MIDDLESEX AND NORTHERN SOMERSET COUNTIES...

AT 1242 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
THAT THE HEAVY RAIN HAD LEFT THE WARNED AREA. HOWEVER...WITH SOME 
LOCATIONS RECEIVING OVER 3 INCHES OF RAIN...RUNOFF WILL BE SLOW TO 
RECEDE AND DOWN STREAM LOCATIONS ALONG SMALL STREAMS...INCLUDING 
MIDDLE BROOK MAY CONTINUE TO RISE OVER THE NEXT FEW HOURS. 
THEREFORE...THE WARNING CONTINUES THROUGH 330 AM EDT.

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO FAR HILLS...
PEAPACK AND GLADSTONE AND BASKING RIDGE

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 4051 7434 4048 7465 4053 7473 4062 7470
      4064 7473 4067 7473 4073 7470 4076 7455
      4070 7451 4068 7453 4065 7452 4067 7446
      4067 7440 4060 7444 4061 7431

$$

SFJ
957 
WGUS71 KPHI 220721
FFSPHI

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
321 AM EDT FRI AUG 22 2014

NJC023-035-220730-
/O.EXP.KPHI.FF.W.0055.000000T0000Z-140822T0730Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SOMERSET NJ-MIDDLESEX NJ-
321 AM EDT FRI AUG 22 2014

...THE FLASH FLOOD WARNING WILL EXPIRE AT 330 AM EDT FOR NORTH
CENTRAL MIDDLESEX AND NORTHERN SOMERSET COUNTIES...

ANY ADDITIONAL RAINFALL THIS MORNING SHOULD BE LIGHT THUS THE 
WARNING WILL BE ALLOWED TO EXPIRE AT 330 AM EDT.

LAT...LON 4051 7434 4048 7465 4053 7473 4062 7470
      4064 7473 4067 7473 4073 7470 4076 7455
      4070 7451 4068 7453 4065 7452 4067 7446
      4067 7440 4060 7444 4061 7431

$$

SFJ

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 21, 9:20 PM EDTSpecial Weather StatementPHIHunterdon55 min
Aug 21, 10:39 PM EDTAreal Flood AdvisoryPHIHunterdon, Morris, Somerset, Warren4 hr
Aug 21, 10:52 PM EDTFlash Flood WarningPHISussex4 hr
Aug 21, 11:59 PM EDTFlash Flood WarningPHIHunterdon, Warren4 hr
Aug 22, 12:38 AM EDTSpecial Weather StatementPHICape May37 min
Aug 22, 1:13 AM EDTSpecial Weather StatementPHIOcean62 min
Aug 22, 1:48 AM EDTAreal Flood AdvisoryPHIBurlington, Ocean4 hr
Aug 22, 2:08 AM EDTSpecial Weather StatementPHIOcean67 min
Aug 22, 3:01 PM EDTSmall Craft AdvisoryPHI3 days

Nearby

Flash Flood Warnings in New Jersey, 2014Every flash flood warning in 2014

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.