Alert archive / New Jersey / Areal Flood Warnings in 2011

Areal Flood Warning 93, NWS Philadelphia/Mount Holly

September 23, 2011Middlesex County, Morris County, Somerset County, New Jersey

NWS Philadelphia/Mount Holly issued this areal flood warning at Sep 23, 2011, 7:48 PM EDT for Middlesex County, Morris County, Somerset County, New Jersey. It was in force for 5 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
Sep 23, 2011, 7:48 PM EDT (23:48 UTC)
Expired
Sep 24, 2011, 1:16 AM EDT
In force
5 hr
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon
Flood severity
None

Counties Middlesex County, NJ, Morris County, NJ, Somerset County, NJ

The radar

The Philadelphia radar (KDIX), 78 km from the middle of the area, began a volume at 23:50 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, 11.8 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 2011-09-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 454 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 2011-09-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 53 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
454 J/kg
Mixed-layer CIN
-7 J/kg
Mixed-layer LCL
434 m above ground
0-6 km bulk shear
36 kt
0-1 km storm-relative helicity
53 m²/s²
0-3 km storm-relative helicity
90 m²/s²
Significant tornado parameter
0.1
Supercell composite
1.0

Open this sounding in Storm Lab

The text

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

633 
WGUS41 KPHI 232348
FLWPHI

BULLETIN - IMMEDIATE BROADCAST REQUESTED
FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
748 PM EDT FRI SEP 23 2011

NJC023-027-035-240545-
/O.NEW.KPHI.FA.W.0093.110923T2348Z-110924T0545Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MORRIS NJ-SOMERSET NJ-MIDDLESEX NJ-
748 PM EDT FRI SEP 23 2011

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* FLOOD WARNING FOR URBAN AREAS AND SMALL STREAMS IN...
  MORRIS COUNTY IN NORTHERN NEW JERSEY...
  SOMERSET COUNTY IN NORTHERN NEW JERSEY...
  MIDDLESEX COUNTY IN NORTHERN NEW JERSEY...

* UNTIL 145 AM EDT

* AT 747 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR SHOWED 
MODERATE TO HEAVY RAIN ACROSS PORTIONS OF THE WARNED AREA. WITH UP 
TO ONE AND A HALF INCHES OF RAIN ALREADY FALLING, COMBINED WITH 
ANOTHER ONE TO TWO INCHES THIS EVENING, EXCESSIVE RUNOFF WILL CAUSE 
FLOODING OF SMALL CREEKS AND STREAMS, HIGHWAYS, STREETS AND 
UNDERPASSES AS WELL AS OTHER DRAINAGE AREAS AND LOW LYING SPOTS.   

PRECAUTIONARY/PREPAREDNESS ACTIONS...

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. IF 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.

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.

&&

LAT...LON 4039 7425 4025 7445 4032 7462 4038 7463
      4038 7474 4050 7480 4057 7471 4071 7473
      4078 7489 4090 7478 4092 7465 4108 7451
      4097 7427 4090 7427 4089 7433 4075 7436
      4067 7445 4066 7440 4059 7444 4059 7420

$$

KRUZDLO
1 follow-up statement
669 
WGUS81 KPHI 240516
FLSPHI

FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
116 AM EDT SAT SEP 24 2011

NJC023-027-035-240525-
/O.CAN.KPHI.FA.W.0093.000000T0000Z-110924T0545Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MORRIS NJ-SOMERSET NJ-MIDDLESEX NJ-
116 AM EDT SAT SEP 24 2011

...THE FLOOD WARNING HAS BEEN CANCELLED FOR URBAN AREAS AND SMALL
STREAMS IN MIDDLESEX...SOMERSET AND MORRIS COUNTIES...

LITTLE ADDITIONAL RAIN IS EXPECTED OVERNIGHT, AND THE COUNTY 911 
CENTERS REPORT NO FLOODING EARLY THIS MORNING. 

LAT...LON 4039 7425 4025 7445 4032 7462 4038 7463
      4038 7474 4050 7480 4057 7471 4071 7473
      4078 7489 4090 7478 4092 7465 4108 7451
      4097 7427 4090 7427 4089 7433 4075 7436
      4067 7445 4066 7440 4059 7444 4059 7420

$$

MPD

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 23, 10:13 AM EDTAreal Flood AdvisoryPHIGloucester, Salem5 hr
Sep 23, 10:52 AM EDTAreal Flood AdvisoryPHIBurlington, Camden, Hunterdon, Mercer, Middlesex, Monmouth and 5 more5 hr
Sep 23, 5:27 PM EDTAreal Flood WarningPHIAtlantic, Camden, Cape May, Cumberland, Gloucester, Salem12 hr
Sep 23, 5:53 PM EDTAreal Flood WarningPHIWarren12 hr
Sep 23, 6:31 PM EDTSpecial Weather StatementPHISalem29 min
Sep 23, 6:34 PM EDTAreal Flood WarningPHIHunterdon, Mercer4 hr
Sep 23, 6:38 PM EDTAreal Flood WarningPHISussex6 hr
Sep 23, 7:30 PM EDTAreal Flood WarningPHIBurlington, Monmouth, Ocean2 hr

Nearby

Areal Flood Warnings in New Jersey, 2011Every areal 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.