Alert archive / New Jersey / Flash Flood Warnings in 2012

Flash Flood Warning 19, NWS Philadelphia/Mount Holly

July 23, 2012Sussex County, New Jersey

NWS Philadelphia/Mount Holly issued this flash flood warning at Jul 23, 2012, 1:11 PM EDT for Sussex County, New Jersey. It was in force for 3 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
Jul 23, 2012, 1:11 PM EDT (17:11 UTC)
Expired
Jul 23, 2012, 3:51 PM EDT
In force
3 hr
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon
Flood severity
None

County Sussex County, NJ

The radar

The Philadelphia radar (KDIX), 137 km from the middle of the area, began a volume at 17:13 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 12:00Z, 5.2 hours before the alert went out and 159 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 2012-07-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 253 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 2012-07-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 83 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
253 J/kg
Mixed-layer CIN
-124 J/kg
Mixed-layer LCL
903 m above ground
0-6 km bulk shear
22 kt
0-1 km storm-relative helicity
83 m²/s²
0-3 km storm-relative helicity
69 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.

298 
WGUS51 KPHI 231711
FFWPHI
NJC037-232115-
/O.NEW.KPHI.FF.W.0019.120723T1711Z-120723T2115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
111 PM EDT MON JUL 23 2012

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SUSSEX COUNTY...

* UNTIL 515 PM EDT...

* AT 105 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  VERY HEAVY RAIN FROM A PAIR OF THUNDERSTORMS OVER 
  WESTERN SUSSEX COUNTY. RAINFALL ESTIMATES HAVE ALREADY REACHED
  TWO INCHES AND AN ADDITIONAL ONE TO TWO INCHES OF RAIN ARE LIKELY
  IN THE WESTERN PART OF THE COUNTY.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO NEWTON.
  THE GREATEST FLOOD THREAT IS IN THE WESTERN PART OF THE COUNTY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IN HILLY TERRAIN THERE ARE HUNDREDS OF LOW WATER CROSSINGS WHICH ARE
POTENTIALLY DANGEROUS IN HEAVY RAIN. DO NOT ATTEMPT TO TRAVEL ACROSS
FLOODED ROADS. FIND ALTERNATE ROUTES. IT TAKES ONLY A FEW INCHES OF
SWIFTLY FLOWING WATER TO CARRY VEHICLES AWAY.

DO NOT DRIVE AROUND BARRICADES.

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

&&

LAT...LON 4115 7443 4092 7469 4111 7498 4117 7489
      4125 7487 4131 7480

$$

TFG
1 follow-up statement
772 
WGUS71 KPHI 231951
FFSPHI

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
351 PM EDT MON JUL 23 2012

NJC037-231959-
/O.CAN.KPHI.FF.W.0019.000000T0000Z-120723T2115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SUSSEX NJ-
351 PM EDT MON JUL 23 2012

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR ALL OF SUSSEX 
COUNTY EXCEPT SOUTHEAST...

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.

DOPPLER RADAR STORM TOTAL ESTIMATES NEARED 5 INCHES IN SANDYSTON
TOWNSHIP.

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO MONTAGUE.

LAT...LON 4115 7443 4092 7469 4111 7498 4117 7489
      4125 7487 4131 7480

$$
 
TFG

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 23, 11:26 AM EDTSpecial Weather StatementPHISussex94 min
Jul 23, 12:19 PM EDTSpecial Weather StatementPHISussex56 min
Jul 23, 12:32 PM EDTSevere Thunderstorm WarningPHISussex73 min
Jul 23, 1:00 PM EDTSevere Thunderstorm WarningPHISussex60 min
Jul 23, 1:57 PM EDTSevere Thunderstorm WarningPHISussex78 min
Jul 23, 2:24 PM EDTSpecial Weather StatementPHIWarren66 min
Jul 23, 2:44 PM EDTSevere Thunderstorm WarningPHIMorris, Warren76 min
Jul 23, 2:47 PM EDTFlash Flood WarningPHIMorris, Sussex, Warren3 hr
Jul 23, 3:42 PM EDTSevere Thunderstorm WarningPHIHunterdon, Middlesex, Morris, Somerset78 min
Jul 23, 4:56 PM EDTSpecial Weather StatementPHIMiddlesex, Monmouth, Somerset94 min
Jul 23, 5:56 PM EDTSpecial Weather StatementPHIBurlington, Camden, Hunterdon, Mercer64 min
Jul 23, 6:35 PM EDTSpecial Weather StatementPHIMorris, Sussex85 min
Jul 23, 6:51 PM EDTSevere Thunderstorm WarningPHIHunterdon, Morris, Somerset, Sussex, Warren69 min
Jul 23, 7:39 PM EDTFlash Flood WarningPHISussex, Warren2 hr
Jul 23, 7:56 PM EDTSevere Thunderstorm WarningPHIMorris, Sussex, Warren59 min

Nearby

Flash Flood Warnings in New Jersey, 2012Every 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.