Alert archive / New Jersey / Areal Flood Warnings in 2012

Areal Flood Warning 2, NWS Philadelphia/Mount Holly

May 15, 2012Warren County, New Jersey; Northampton County, Pennsylvania

NWS Philadelphia/Mount Holly issued this areal flood warning at May 15, 2012, 8:46 PM EDT for Warren County, New Jersey; Northampton County, Pennsylvania. It was in force for 76 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: May 15, 2012, 8:46 PM EDT (00:46 UTC)
Expired: May 15, 2012, 10:02 PM EDT
In force: 76 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Flood severity: None

Counties Warren County, NJ, Northampton County, PA

The radar

The Philadelphia radar (KDIX), 120 km from the middle of the area, began a volume at 00:49 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, 0.8 hours before the alert went out and 181 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: 254 J/kg
Mixed-layer CIN: -15 J/kg
Mixed-layer LCL: 438 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 91 m²/s²
0-3 km storm-relative helicity: 117 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

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

208 
WGUS41 KPHI 160046
FLWPHI

BULLETIN - IMMEDIATE BROADCAST REQUESTED
FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
846 PM EDT TUE MAY 15 2012

NJC041-PAC095-160345-
/O.NEW.KPHI.FA.W.0002.120516T0046Z-120516T0345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WARREN NJ-NORTHAMPTON PA-
846 PM EDT TUE MAY 15 2012

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* FLOOD WARNING FOR URBAN AREAS AND SMALL STREAMS IN...
  NORTHERN WARREN COUNTY IN NORTHWEST NEW JERSEY...
  NORTHEASTERN NORTHAMPTON COUNTY IN EASTERN PENNSYLVANIA...

* UNTIL 1145 PM EDT

* AT 842 PM EDT...NATIONAL WEATHER SERVICE RADAR SHOWED SLOW-MOVING
  THUNDERSTORMS WITH HEAVY RAIN BETWEEN ALLENTOWN AND ANDOVER. THE
  RAINFALL WILL CAUSE SOME FLOODING OF SMALL STREAMS AND POOR
  DRAINAGE AREAS. 

A FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR HAS BEEN REPORTED.
ALTHOUGH FLASH FLOODING IS NOT EXPECTED...ALL INTERESTED PARTIES 
SHOULD TAKE NECESSARY PRECAUTIONS IMMEDIATELY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE SOME FLOODING OF  
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.

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.

&&

LAT...LON 4098 7485 4097 7484 4079 7487 4076 7493
      4076 7527 4095 7517 4095 7514 4097 7512
      4097 7514 4099 7513 4103 7490

$$

MPD

1 follow-up statement

804 
WGUS81 KPHI 160202
FLSPHI

FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1002 PM EDT TUE MAY 15 2012

NJC041-PAC095-160212-
/O.CAN.KPHI.FA.W.0002.000000T0000Z-120516T0345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WARREN NJ-NORTHAMPTON PA-
1002 PM EDT TUE MAY 15 2012

...THE FLOOD WARNING HAS BEEN CANCELLED FOR URBAN AREAS AND SMALL
STREAMS IN NORTHEASTERN NORTHAMPTON AND CENTRAL WARREN COUNTIES...

THUNDERSTORMS HAD CLEARED THE AREA. 

LAT...LON 4098 7485 4097 7484 4079 7487 4076 7493
      4076 7527 4095 7517 4095 7514 4097 7512
      4097 7514 4099 7513 4103 7490

$$

MPD

The office that day

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

Issued	Product	Office	Counties	Lasted
May 15, 8:19 PM EDT	Special Weather Statement	PHI	Hunterdon, Warren	86 min
May 15, 9:56 PM EDT	Special Weather Statement	PHI	Morris, Somerset	94 min
May 15, 10:48 PM EDT	Special Weather Statement	PHI	Somerset	57 min
May 16, 2:20 AM EDT	Special Weather Statement	PHI	Mercer	55 min
May 16, 10:36 AM EDT	Small Craft Advisory for Hazardous Seas	PHI		7 hr
May 15, 9:00 PM EDT	Special Weather Statement	PHI	Berks	90 min
May 15, 9:49 PM EDT	Special Weather Statement	PHI	Berks, Bucks, Chester, Lehigh, Montgomery	86 min
May 15, 10:45 PM EDT	Areal Flood Advisory	PHI	Chester	57 min
May 15, 11:05 PM EDT	Special Weather Statement	PHI	Bucks, Chester, Delaware, Montgomery	55 min
May 15, 11:24 PM EDT	Areal Flood Advisory	PHI	Chester, Montgomery	116 min
May 15, 11:38 PM EDT	Areal Flood Warning	PHI	Chester, Montgomery	4 hr
May 16, 12:12 AM EDT	Areal Flood Advisory	PHI	Chester, Delaware, Montgomery	3 hr
May 16, 12:20 AM EDT	Special Weather Statement	PHI	Delaware, Philadelphia	55 min
May 16, 12:34 AM EDT	Flash Flood Warning	PHI	Chester, Delaware, Montgomery	4 hr
May 16, 2:37 AM EDT	Areal Flood Warning	PHI	Philadelphia	3 hr
May 16, 4:27 AM EDT	Areal Flood Warning	PHI	Delaware	3 hr

Nearby

Areal Flood Warnings in New Jersey, 2012 Areal Flood Warnings in Pennsylvania, 2012 Every areal 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.