Alert archive / New Jersey / Flash Flood Warnings in 2018

Flash Flood Warning 23, NWS Philadelphia/Mount Holly

July 3, 20184 counties in New Jersey

NWS Philadelphia/Mount Holly issued this flash flood warning at Jul 3, 2018, 5:47 PM EDT for 4 counties in New Jersey. It was in force for 2 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
Jul 3, 2018, 5:47 PM EDT (21:47 UTC)
Expired
Jul 3, 2018, 8:00 PM EDT
In force
2 hr
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon
Flood severity
None

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

What was reported inside it

TimeReportWhereRemark
Jul 3, 7:45 PM EDTFLASH FLOODPrinceton Junction, NJREPORT AND VIDEO OF FLASH FLOODING OCCURING AT THE NJ TRANSIT STATION. THE PEDESTRIAN TUNNEL HAD FILLED UP WITH WATER

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, 9.8 hours before the alert went out and 169 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 12:00Z on 2018-07-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 864 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Brookhaven, NY at 12:00Z on 2018-07-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 22 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
864 J/kg
Mixed-layer CIN
-149 J/kg
Mixed-layer LCL
920 m above ground
0-6 km bulk shear
10 kt
0-1 km storm-relative helicity
22 m²/s²
0-3 km storm-relative helicity
35 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

816 
WGUS51 KPHI 032147
FFWPHI
NJC019-021-023-035-040145-
/O.NEW.KPHI.FF.W.0023.180703T2147Z-180704T0145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
547 PM EDT TUE JUL 3 2018

The National Weather Service in Mount Holly NJ has issued a

* Flash Flood Warning for...
  South central Hunterdon County in northwestern New Jersey...
  Mercer County in central New Jersey...
  South central Somerset County in northern New Jersey...
  Southwestern Middlesex County in northern New Jersey...

* Until 945 PM EDT.

* At 547 PM EDT, Doppler radar indicated thunderstorms producing
  heavy rain across the warned area. Flash flooding is expected to
  begin shortly in the areas of heaviest rain.

* Some locations that could experience flooding include...
  Trenton, South Brunswick, Ewing, Princeton, Hightstown, Cranbury,
  Pennington, Yardley, Hopewell, Allentown, Rocky Hill, Stockton,
  Washington Crossing, Skillman, Princeton Meadows, Windsor,
  Kingston, Dayton, Plainsboro Center and Clearbrook Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around...don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.

A Flash Flood Warning means that flooding is imminent or occurring.
If you are in the warned area move to higher ground immediately.
Residents living along streams and creeks should take immediate
precautions to protect life and property.

&&

LAT...LON 4022 7453 4018 7457 4018 7461 4016 7460
      4015 7464 4019 7470 4016 7472 4022 7477
      4024 7483 4030 7487 4033 7493 4040 7496
      4041 7498 4043 7451 4026 7444

$$

Meola
1 follow-up statement
545 
WGUS71 KPHI 040000
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
800 PM EDT TUE JUL 3 2018

NJC019-021-023-035-040008-
/O.CAN.KPHI.FF.W.0023.000000T0000Z-180704T0145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Hunterdon NJ-Mercer NJ-Somerset NJ-Middlesex NJ-
800 PM EDT TUE JUL 3 2018

...THE FLASH FLOOD WARNING FOR SOUTH CENTRAL HUNTERDON...MERCER...
SOUTH CENTRAL SOMERSET AND SOUTHWESTERN MIDDLESEX COUNTIES IS
CANCELLED...

The heavy rain has moved out of the area. Flood waters are receding. 
Since flooding no longer poses a threat to life and property, the 
Flash Flood Warning has been cancelled. However, a flood advisory 
will remain in effect for Mercer County until all streams have 
returned to their banks.

LAT...LON 4022 7453 4018 7457 4018 7461 4016 7460
      4015 7464 4019 7470 4016 7472 4022 7477
      4024 7483 4030 7487 4033 7493 4040 7496
      4041 7498 4043 7451 4026 7444

$$

JJM

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 3, 2:33 PM EDTSpecial Weather StatementPHIUnion27 min
Jul 3, 2:57 PM EDTSpecial Weather StatementPHIMorris63 min
Jul 3, 3:19 PM EDTFlash Flood WarningPHIMorris3 hr
Jul 3, 3:28 PM EDTSpecial Weather StatementPHISalem62 min
Jul 3, 3:30 PM EDTSpecial Weather StatementPHIBurlington60 min
Jul 3, 3:43 PM EDTFlash Flood WarningPHIMorris2 hr
Jul 3, 4:49 PM EDTSpecial Weather StatementPHISomerset56 min
Jul 3, 4:52 PM EDTSpecial Weather StatementPHIMercer53 min
Jul 3, 4:57 PM EDTFlash Flood WarningPHIHunterdon, Somerset114 min
Jul 3, 5:24 PM EDTAreal Flood AdvisoryPHIBurlington, Camden, Gloucester4 hr
Jul 3, 5:29 PM EDTAreal Flood AdvisoryPHIHunterdon, Mercer, Middlesex, Monmouth, Somerset4 hr
Jul 3, 5:45 PM EDTFlash Flood WarningPHICamden, Gloucester4 hr
Jul 3, 5:57 PM EDTSpecial Weather StatementPHIGloucester33 min
Jul 3, 6:03 PM EDTSpecial Weather StatementPHISussex57 min
Jul 3, 6:11 PM EDTSevere Thunderstorm WarningPHICamden, Gloucester49 min
Jul 3, 6:25 PM EDTSevere Thunderstorm WarningPHIBurlington, Camden50 min
Jul 3, 6:37 PM EDTFlash Flood WarningPHIBurlington, Camden3 hr
Jul 3, 6:46 PM EDTSevere Thunderstorm WarningPHIBurlington, Camden, Gloucester44 min
Jul 3, 6:58 PM EDTFlash Flood WarningPHIBurlington, Camden, Gloucester49 min
Jul 3, 7:03 PM EDTSpecial Weather StatementPHIWarren57 min

Nearby

Flash Flood Warnings in New Jersey, 2018Every flash flood warning in 2018

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.