Alert archive / New Jersey / Flash Flood Warnings in 2015
Flash Flood Warning 49, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at Aug 21, 2015, 12:46 AM EDT for 5 counties in New Jersey; Bucks County, Montgomery County, Philadelphia County, Pennsylvania. It was in force for 4 hr. 1 report came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Aug 21, 2015, 12:46 AM EDT (04:46 UTC)
- Expired
- Aug 21, 2015, 4:45 AM EDT
- In force
- 4 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Flood severity
- None
Counties Burlington County, NJ, Mercer County, NJ, Middlesex County, NJ, Monmouth County, NJ, Somerset County, NJ, Bucks County, PA, Montgomery County, PA, Philadelphia County, PA
The radar
The Philadelphia radar (KDIX), 50 km from the middle of the area, began a volume at 04:46 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 21, 1:31 AM EDT | FLOOD | Abington Twp, PA | LOCALIZED FLOODING ON ROADWAYS |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Brookhaven, NY (KOKX), launched 00:00Z, 4.8 hours before the alert went out and 180 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.
- Mixed-layer CAPE
- 178 J/kg
- Mixed-layer CIN
- -11 J/kg
- Mixed-layer LCL
- 657 m above ground
- 0-6 km bulk shear
- 9 kt
- 0-1 km storm-relative helicity
- 72 m²/s²
- 0-3 km storm-relative helicity
- 121 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
385
WGUS51 KPHI 210446
FFWPHI
NJC005-021-023-025-035-PAC017-091-101-210845-
/O.NEW.KPHI.FF.W.0049.150821T0446Z-150821T0845Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1246 AM EDT FRI AUG 21 2015
THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A
* FLASH FLOOD WARNING FOR...
MERCER COUNTY IN CENTRAL NEW JERSEY...
SOUTHWESTERN MONMOUTH COUNTY IN CENTRAL NEW JERSEY...
SOUTHWESTERN SOMERSET COUNTY IN NORTHERN NEW JERSEY...
SOUTHWESTERN MIDDLESEX COUNTY IN NORTHERN NEW JERSEY...
NORTHWESTERN BURLINGTON COUNTY IN SOUTHERN NEW JERSEY...
SOUTHEASTERN BUCKS COUNTY IN SOUTHEASTERN PENNSYLVANIA...
SOUTHEASTERN MONTGOMERY COUNTY IN SOUTHEASTERN PENNSYLVANIA...
NORTHERN PHILADELPHIA COUNTY IN SOUTHEASTERN PENNSYLVANIA...
* UNTIL 445 AM EDT
* AT 1245 AM EDT...DOPPLER RADAR INDICATED A THUNDERSTORM PRODUCING
HEAVY RAIN ACROSS THE WARNED AREA. 1.5 INCHES OF RAIN HAVE FALLEN
WITH AN ADDITIONAL INCH TO INCH AND A HALF POSSIBLE WITHIN THE
NEXT HOUR. FLASH FLOODING IS EXPECTED TO BEGIN SHORTLY.
* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
PHILADELPHIA...TRENTON...BENSALEM...EAST BRUNSWICK...SOUTH
BRUNSWICK...NORTH BRUNSWICK...EWING...WILLINGBORO...PRINCETON...
FLORENCE...BURLINGTON...BRISTOL...RIVERSIDE...HIGHTSTOWN...
JENKINTOWN...NARBERTH...BORDENTOWN...CRANBURY...PENNINGTON AND
BEVERLY.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
MOVE TO HIGHER GROUND NOW. ACT QUICKLY TO PROTECT YOUR LIFE.
TURN AROUND...DON'T DROWN WHEN ENCOUNTERING FLOODED ROADS. MOST FLOOD
DEATHS OCCUR IN VEHICLES.
&&
LAT...LON 4008 7455 4005 7454 4000 7526 4014 7528
4014 7511 4028 7502 4036 7504 4038 7496
4034 7494 4035 7486 4038 7487 4038 7481
4041 7481 4043 7475 4046 7447 4014 7445
$$
HEAVENER2 follow-up statements
758
WGUS71 KPHI 210757
FFSPHI
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
357 AM EDT FRI AUG 21 2015
NJC005-021-023-025-035-PAC017-091-101-210845-
/O.CON.KPHI.FF.W.0049.000000T0000Z-150821T0845Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MERCER NJ-MONMOUTH NJ-SOMERSET NJ-MIDDLESEX NJ-BURLINGTON NJ-
BUCKS PA-MONTGOMERY PA-PHILADELPHIA PA-
357 AM EDT FRI AUG 21 2015
...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 445 AM EDT FOR
MERCER...SOUTHWESTERN MONMOUTH...SOUTHWESTERN SOMERSET...SOUTHWESTERN
MIDDLESEX...NORTHWESTERN BURLINGTON...SOUTHEASTERN BUCKS...
SOUTHEASTERN MONTGOMERY AND NORTHERN PHILADELPHIA COUNTIES...
AT 342 AM EDT...FLASH FLOODING IS LIKELY OR ALREADY OCCURRING IN
PORTIONS OF SOUTHEASTERN MONTGOMERY COUNTY INTO NORTH CENTRAL
PHILADELPHIA COUNTY.
SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
PHILADELPHIA...TRENTON...BENSALEM...EAST BRUNSWICK...SOUTH
BRUNSWICK...NORTH BRUNSWICK...EWING...WILLINGBORO...PRINCETON...
FLORENCE...BURLINGTON...BRISTOL...RIVERSIDE...HIGHTSTOWN...
JENKINTOWN...NARBERTH...BORDENTOWN...CRANBURY...PENNINGTON AND
BEVERLY.
FLOOD WATERS ARE MOVING DOWN THE WISSAHICKON CREEK FROM FORT
WASHINGTON TO PHILADELPHIA. THE FLOOD CREST IS EXPECTED TO REACH
PHILADELPHIA ON THE WISSAHICKON BY 430AM.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
MOVE TO HIGHER GROUND NOW. ACT QUICKLY TO PROTECT YOUR LIFE.
TURN AROUND...DON'T DROWN WHEN ENCOUNTERING FLOODED ROADS. MOST FLOOD
DEATHS OCCUR IN VEHICLES.
&&
LAT...LON 4008 7455 4005 7454 4000 7526 4014 7528
4014 7511 4028 7502 4036 7504 4038 7496
4034 7494 4035 7486 4038 7487 4038 7481
4041 7481 4043 7475 4046 7447 4014 7445
$$
HEAVENER788
WGUS71 KPHI 210837
FFSPHI
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
437 AM EDT FRI AUG 21 2015
NJC005-021-023-025-035-PAC017-091-101-210847-
/O.EXP.KPHI.FF.W.0049.000000T0000Z-150821T0845Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MERCER NJ-MONMOUTH NJ-SOMERSET NJ-MIDDLESEX NJ-BURLINGTON NJ-
BUCKS PA-MONTGOMERY PA-PHILADELPHIA PA-
437 AM EDT FRI AUG 21 2015
...THE FLASH FLOOD WARNING FOR MERCER...SOUTHWESTERN MONMOUTH...
SOUTHWESTERN SOMERSET...SOUTHWESTERN MIDDLESEX...NORTHWESTERN
BURLINGTON...SOUTHEASTERN BUCKS...SOUTHEASTERN MONTGOMERY AND
NORTHERN PHILADELPHIA COUNTIES WILL EXPIRE AT 445 AM EDT...
FLOOD WATERS HAVE RECEDED...AND ARE NO LONGER EXPECTED TO POSE A
THREAT TO LIFE OR PROPERTY. PLEASE CONTINUE TO HEED ANY ROAD
CLOSURES.
LAT...LON 4008 7455 4005 7454 4000 7526 4014 7528
4014 7511 4028 7502 4036 7504 4038 7496
4034 7494 4035 7486 4038 7487 4038 7481
4041 7481 4043 7475 4046 7447 4014 7445
$$
HEAVENERThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 20, 11:18 PM EDT | Special Weather Statement | PHI | Hunterdon, Mercer | 57 min |
| Aug 20, 11:35 PM EDT | Areal Flood Advisory | PHI | Burlington, Hunterdon, Mercer, Middlesex, Somerset | 4 hr |
| Aug 21, 12:51 AM EDT | Special Weather Statement | PHI | Mercer | 39 min |
| Aug 21, 1:02 AM EDT | Severe Thunderstorm Warning | PHI | Burlington, Mercer, Middlesex, Monmouth, Ocean | 37 min |
| Aug 21, 1:38 AM EDT | Areal Flood Advisory | PHI | Atlantic, Cape May, Cumberland, Gloucester, Salem | 4 hr |
| Aug 21, 2:30 AM EDT | Areal Flood Advisory | PHI | Sussex | 4 hr |
| Aug 21, 3:10 AM EDT | Flash Flood Warning | PHI | Cape May | 4 hr |
| Aug 21, 4:31 AM EDT | Areal Flood Advisory | PHI | Middlesex, Monmouth, Ocean | 4 hr |
| Aug 20, 9:08 PM EDT | Areal Flood Advisory | PHI | Berks, Carbon, Lehigh, Monroe, Northampton | 4 hr |
| Aug 20, 10:32 PM EDT | Areal Flood Advisory | PHI | Berks, Bucks, Chester, Lehigh, Montgomery, Northampton | 4 hr |
| Aug 20, 10:55 PM EDT | Flash Flood Warning | PHI | Berks, Bucks, Chester, Lehigh, Montgomery | 4 hr |
| Aug 21, 5:38 AM EDT | Areal Flood Warning | PHI | Philadelphia | 112 min |
Nearby
Flash Flood Warnings in New Jersey, 2015Flash Flood Warnings in Pennsylvania, 2015Every flash flood warning in 2015
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.