Alert archive / New Jersey / Flash Flood Warnings in 2013

Flash Flood Warning 18, NWS Philadelphia/Mount Holly

June 27, 2013Hunterdon County, Mercer County, Somerset County, New Jersey

NWS Philadelphia/Mount Holly issued this flash flood warning at Jun 27, 2013, 8:04 PM EDT for Hunterdon County, Mercer County, Somerset County, New Jersey. It was in force for 4 hr. 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
Jun 27, 2013, 8:04 PM EDT (00:04 UTC)
Expired
Jun 28, 2013, 12:00 AM EDT
In force
4 hr
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon
Flood severity
None

Counties Hunterdon County, NJ, Mercer County, NJ, Somerset County, NJ

The radar

The Philadelphia radar (KDIX), 45 km from the middle of the area, began a volume at 00:05 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

TimeReportWhereRemark
Jun 27, 9:00 PM EDTFLASH FLOODBranchburg, NJCHAMBERS BROOK FLOODED.

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 00:00Z, 0.1 hours before the alert went out and 160 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 2013-06-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 349 joules per kilogram.LCLLFCEL10008507005003002001001 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 2013-06-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 119 square meters per square second.1939Sfc1 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
349 J/kg
Mixed-layer CIN
-92 J/kg
Mixed-layer LCL
637 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
119 m²/s²
0-3 km storm-relative helicity
127 m²/s²
Significant tornado parameter
0.1
Supercell composite
1.8

Open this sounding in Storm Lab

The text

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

825 
WGUS51 KPHI 280004
FFWPHI
NJC019-021-035-280400-
/O.NEW.KPHI.FF.W.0018.130628T0004Z-130628T0400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
804 PM EDT THU JUN 27 2013

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTHEASTERN HUNTERDON COUNTY...
  MERCER COUNTY...
  SOUTHERN SOMERSET COUNTY...

* UNTIL MIDNIGHT EDT...

* AT 758 PM EDT...RAIN GAGE REPORTS OF UP TO 2.5 INCHES IN ONE HOUR  
  HAVE BEEN REPORTED IN SECTIONS OF MERCER COUNTY...ALONG WITH       
  ROADWAY FLOODING. DOPPLER RADAR INDICATES AN ADDITIONAL ONE INCH   
  OF RAIN IS POSSIBLE IN THE NEXT HOUR OR SO. A FLASH FLOOD WARNING  
  HAS THEREFORE BEEN ISSUED.

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. 
NEVER ATTEMPT TO CROSS SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN 
DEPTH BY FOOT OR IN AN AUTOMOBILE. TURN AROUND DON'T DROWN!

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. IF FLASH FLOODING IS OBSERVED ACT QUICKLY. MOVE
UP TO HIGHER GROUND TO ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS
SUBJECT TO FLOODING WHEN WATER BEGINS RISING.

&&

LAT...LON 4049 7447 4041 7459 4036 7463 4032 7462
      4028 7449 4025 7448 4019 7457 4019 7461
      4016 7460 4015 7462 4018 7471 4015 7472
      4021 7477 4032 7492 4058 7482 4055 7452
      4050 7447

$$

FORECASTER:JJM
1 follow-up statement
343 
WGUS71 KPHI 280354
FFSPHI

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1154 PM EDT THU JUN 27 2013

NJC019-021-035-280400-
/O.EXP.KPHI.FF.W.0018.000000T0000Z-130628T0400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
HUNTERDON NJ-MERCER NJ-SOMERSET NJ-
1154 PM EDT THU JUN 27 2013

...THE FLASH FLOOD WARNING WILL EXPIRE AT MIDNIGHT EDT FOR SOUTHERN
SOMERSET...MERCER AND SOUTHEASTERN HUNTERDON COUNTIES...

THE WATERS FROM THE EARLIER HEAVY RAINS ARE RECEDING AND NO LONGER
POSE A THREAT TO LIFE OR PROPERTY. THEREFORE...THE FLASH FLOOD
WARNING WILL BE ALLOWED TO EXPIRE.

THERE MAY STILL BE SOME LOCALIZED AREAS OF HIGH WATER IN LOW LYING 
AREAS AND SOME ROADWAYS.

LAT...LON 4049 7447 4041 7459 4036 7463 4032 7462
      4028 7449 4025 7448 4019 7457 4019 7461
      4016 7460 4015 7462 4018 7471 4015 7472
      4021 7477 4032 7492 4058 7482 4055 7452
      4050 7447

$$

ROBERTSON

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 27, 8:06 PM EDTSpecial Weather StatementPHIAtlantic, Burlington, Ocean54 min
Jun 27, 8:18 PM EDTSpecial Weather StatementPHIMercer, Middlesex, Morris, Somerset, Sussex, Warren72 min
Jun 27, 10:00 PM EDTAreal Flood AdvisoryPHIHunterdon, Mercer, Middlesex, Morris, Somerset, Sussex and 1 more3 hr
Jun 27, 10:48 PM EDTAreal Flood WarningPHISomerset4 hr
Jun 28, 1:01 AM EDTAreal Flood AdvisoryPHIMercer, Somerset5 hr
Jun 28, 4:23 PM EDTSpecial Weather StatementPHICamden, Gloucester52 min
Jun 28, 4:46 PM EDTSpecial Marine WarningPHI44 min
Jun 28, 4:55 PM EDTSevere Thunderstorm WarningPHIBurlington, Camden, Gloucester65 min
Jun 28, 5:49 PM EDTFlash Flood WarningPHICamden, Gloucester, Salem4 hr
Jun 28, 5:57 PM EDTSevere Thunderstorm WarningPHIBurlington48 min
Jun 28, 6:13 PM EDTSpecial Weather StatementPHIOcean62 min

Nearby

Flash Flood Warnings in New Jersey, 2013Every 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.