Alert archive / New Jersey / Flash Flood Warnings in 2011

Flash Flood Warning 32, NWS Philadelphia/Mount Holly

August 15, 2011Morris County, Sussex County, New Jersey

NWS Philadelphia/Mount Holly issued this flash flood warning at Aug 15, 2011, 3:10 PM EDT for Morris County, 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
Aug 15, 2011, 3:10 PM EDT (19:10 UTC)
Expired
Aug 15, 2011, 5:50 PM EDT
In force
3 hr
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon
Flood severity
None

Counties Morris County, NJ, Sussex County, NJ

The radar

The Philadelphia radar (KDIX), 109 km from the middle of the area, began a volume at 19:12 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, 7.2 hours before the alert went out and 141 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 2011-08-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 94 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 12:00Z on 2011-08-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 112 square meters per square second.19395878Sfc1 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
94 J/kg
Mixed-layer CIN
-10 J/kg
Mixed-layer LCL
619 m above ground
0-6 km bulk shear
17 kt
0-1 km storm-relative helicity
112 m²/s²
0-3 km storm-relative helicity
127 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.

655 
WGUS51 KPHI 151910
FFWPHI
NJC027-037-152200-
/O.NEW.KPHI.FF.W.0032.110815T1910Z-110815T2200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
310 PM EDT MON AUG 15 2011

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

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

* UNTIL 600 PM EDT...

* AT 310 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  VERY HEAVY RAIN FROM THUNDERSTORMS OVER MORRIS AND SUSSEX COUNTIES 
  IN NORTHWESTERN NEW JERSEY. UP TO ONE INCH PER HOUR HAS BEEN 
  REPORTED. GIVEN THE ALREADY WET CONDITIONS FROM RAIN ON SATURDAY AND
  SUNDAY...FLASH FLOODING CAN BE EXPECTED WHEREVER THE HEAVIEST RAIN
  HAPPENS TO FALL.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO MORRISTOWN
  AND NEWTON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS 
SAFELY. MOVE TO HIGHER GROUND. MANY FLOODING DEATHS OCCUR IN CARS!

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

&&

LAT...LON 4120 7437 4109 7449 4104 7449 4105 7444
      4101 7439 4099 7429 4089 7426 4089 7433
      4086 7431 4073 7437 4064 7452 4070 7451
      4074 7456 4071 7474 4073 7483 4078 7489
      4083 7482 4091 7477 4109 7499 4135 7469

$$

FORECASTER:JJM
1 follow-up statement
316 
WGUS71 KPHI 152150
FFSPHI

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
550 PM EDT MON AUG 15 2011

NJC027-037-152158-
/O.CAN.KPHI.FF.W.0032.000000T0000Z-110815T2200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SUSSEX NJ-MORRIS NJ-
550 PM EDT MON AUG 15 2011

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR MORRIS AND SUSSEX
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.

HOWEVER...AN AREAL FLOOD WARNING REMAINS IN EFFECT FOR MORRIS COUNTY 
THAT INCLUDES BEAVER DAM DITCH IN NORTHEAST MORRIS COUNTY. THAT IS A 
SLOWER RESPONDING STREAM AND SO IS NOT CONSIDERED A FLASH FLOOD EVENT.

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO MORRISTOWN
AND NEWTON.

LAT...LON 4120 7437 4109 7449 4104 7449 4105 7444
      4101 7439 4099 7429 4089 7426 4089 7433
      4086 7431 4073 7437 4064 7452 4070 7451
      4074 7456 4071 7474 4073 7483 4078 7489
      4083 7482 4091 7477 4109 7499 4135 7469

$$

JJM

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 14, 11:03 PM EDTAreal Flood WarningPHIMonmouth, Ocean8 hr
Aug 15, 12:03 AM EDTRiver Flood WarningPHISomerset33 hr
Aug 15, 5:31 AM EDTAreal Flood WarningPHICumberland, Gloucester, Salem4 hr
Aug 15, 5:34 AM EDTAreal Flood WarningPHISomerset3 hr
Aug 15, 9:24 AM EDTAreal Flood WarningPHICumberland, Salem12 hr
Aug 15, 1:56 PM EDTSpecial Weather StatementPHIHunterdon, Warren94 min
Aug 15, 2:35 PM EDTFlash Flood WarningPHIHunterdon, Warren3 hr
Aug 15, 2:56 PM EDTSpecial Weather StatementPHIBurlington, Camden, Cumberland, Gloucester, Mercer, Middlesex and 4 more109 min
Aug 15, 3:48 PM EDTSpecial Marine WarningPHI87 min
Aug 15, 4:15 PM EDTSpecial Weather StatementPHICape May60 min
Aug 15, 4:33 PM EDTSpecial Marine WarningPHI57 min
Aug 15, 5:08 PM EDTAreal Flood WarningPHIAtlantic4 hr
Aug 15, 5:25 PM EDTSpecial Marine WarningPHI110 min
Aug 15, 5:46 PM EDTAreal Flood WarningPHIMorris15 hr

Nearby

Flash Flood Warnings in New Jersey, 2011Every flash flood warning in 2011

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.