Alert archive / New Jersey / Areal Flood Warnings in 2011

Areal Flood Warning 39, NWS Philadelphia/Mount Holly

August 15, 2011Somerset County, New Jersey

NWS Philadelphia/Mount Holly issued this areal flood warning at Aug 15, 2011, 5:34 AM EDT for Somerset 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, 5:34 AM EDT (09:34 UTC)
Expired: Aug 15, 2011, 8:43 AM EDT
In force: 3 hr
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Flood severity: None

County Somerset County, NJ

The radar

The Philadelphia radar (KDIX), 60 km from the middle of the area, began a volume at 09:34 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 00:00Z, 9.6 hours before the alert went out and 154 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 117 J/kg
Mixed-layer CIN: -31 J/kg
Mixed-layer LCL: 667 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: 73 m²/s²
0-3 km storm-relative helicity: 169 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

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

861 
WGUS41 KPHI 150934
FLWPHI

BULLETIN - IMMEDIATE BROADCAST REQUESTED
FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
534 AM EDT MON AUG 15 2011

NJC035-152130-
/O.NEW.KPHI.FA.W.0039.110815T0934Z-110815T2130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SOMERSET NJ-
534 AM EDT MON AUG 15 2011

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

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

* UNTIL 530 PM EDT MONDAY

* AT 529 AM EDT THE REMAINING RUNOFF FROM YESTERDAYS EXCESSIVE
  RAINFALL STILL NEEDS TO PASS THROUGH THE MILLSTONE RIVER BASIN.
  THESE BASIN WATERS MAY NOT FALL BELOW FLOOD STAGE UNTIL LATE THIS
  AFTERNOON. 

* THIS WARNING UPDATES THE PREVIOUS WARNING FOR SOMERSET COUNTY AND
  REDUCES ITS COVERAGE BY EXPIRING MORRIS...MERCER AND MIDDLESEX
  COUNTIES. 

A FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR HAS BEEN REPORTED.
STREAM RISES WILL BE SLOW AND FLASH FLOODING IS NOT EXPECTED.
HOWEVER...ALL INTERESTED PARTIES SHOULD TAKE NECESSARY PRECAUTIONS
IMMEDIATELY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE ELEVATED LEVELS ON
SMALL CREEKS AND STREAMS...AND PONDING OF WATER IN URBAN AREAS...
HIGHWAYS...STREETS AND UNDERPASSES AS WELL AS OTHER POOR DRAINAGE
AREAS AND LOW LYING SPOTS.

&&

LAT...LON 4044 7454 4042 7459 4038 7461 4040 7467
      4038 7472 4048 7478 4063 7466 4057 7453
      4048 7450

$$

DRAG

1 follow-up statement

634 
WGUS81 KPHI 151243
FLSPHI

FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
843 AM EDT MON AUG 15 2011

NJC035-151252-
/O.CAN.KPHI.FA.W.0039.000000T0000Z-110815T2130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SOMERSET NJ-
843 AM EDT MON AUG 15 2011

...THE FLOOD WARNING HAS BEEN CANCELLED FOR URBAN AREAS AND SMALL
STREAMS IN SOUTHERN SOMERSET COUNTY...

MOST SMALL STREAMS AND CREEKS IN SOUTHERN SOMERSET COUNTY HAVE 
RETURNED TO THEIR BANKS. HOWEVER, A FLOOD WARNING REMAINS IN EFFECT 
FOR THE MILLSTONE RIVER.

LAT...LON 4044 7454 4042 7459 4038 7461 4040 7467
      4038 7472 4048 7478 4063 7466 4057 7453
      4048 7450

$$

IOVINO

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 14, 11:03 PM EDT	Areal Flood Warning	PHI	Monmouth, Ocean	8 hr
Aug 15, 12:03 AM EDT	River Flood Warning	PHI	Somerset	33 hr
Aug 15, 5:31 AM EDT	Areal Flood Warning	PHI	Cumberland, Gloucester, Salem	4 hr
Aug 15, 9:24 AM EDT	Areal Flood Warning	PHI	Cumberland, Salem	12 hr
Aug 15, 1:56 PM EDT	Special Weather Statement	PHI	Hunterdon, Warren	94 min
Aug 15, 2:35 PM EDT	Flash Flood Warning	PHI	Hunterdon, Warren	3 hr
Aug 15, 2:56 PM EDT	Special Weather Statement	PHI	Burlington, Camden, Cumberland, Gloucester, Mercer, Middlesex and 4 more	109 min
Aug 15, 3:10 PM EDT	Flash Flood Warning	PHI	Morris, Sussex	3 hr
Aug 15, 3:48 PM EDT	Special Marine Warning	PHI		87 min
Aug 15, 4:15 PM EDT	Special Weather Statement	PHI	Cape May	60 min
Aug 15, 4:33 PM EDT	Special Marine Warning	PHI		57 min
Aug 15, 5:08 PM EDT	Areal Flood Warning	PHI	Atlantic	4 hr
Aug 15, 5:25 PM EDT	Special Marine Warning	PHI		110 min
Aug 15, 5:46 PM EDT	Areal Flood Warning	PHI	Morris	15 hr

Nearby

Areal Flood Warnings in New Jersey, 2011 Every 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.