Alert archive / Pennsylvania / Flash Flood Warnings in 2010

Flash Flood Warning 6, NWS Philadelphia/Mount Holly

July 13, 2010Bucks County, Montgomery County, Philadelphia County, Pennsylvania; Burlington County, Camden County, Mercer County, New Jersey

NWS Philadelphia/Mount Holly issued this flash flood warning at Jul 13, 2010, 10:28 AM EDT for Bucks County, Montgomery County, Philadelphia County, Pennsylvania; Burlington County, Camden County, Mercer 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: Jul 13, 2010, 10:28 AM EDT (14:28 UTC)
Expired: Jul 13, 2010, 1:35 PM EDT
In force: 3 hr
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Flood severity: None

Counties Burlington County, NJ, Camden County, NJ, Mercer County, NJ, Bucks County, PA, Montgomery County, PA, Philadelphia County, PA

The radar

The Philadelphia radar (KDIX), 52 km from the middle of the area, began a volume at 14:30 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

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 2.5 hours before the alert went out and 117 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: 670 J/kg
Mixed-layer CIN: -6 J/kg
Mixed-layer LCL: 553 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 31 m²/s²
0-3 km storm-relative helicity: 80 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

Open this sounding in Storm Lab

The text

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

793 
WGUS51 KPHI 131428
FFWPHI
NJC005-007-021-PAC017-091-101-131830-
/O.NEW.KPHI.FF.W.0006.100713T1428Z-100713T1830Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1028 AM EDT TUE JUL 13 2010

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTHERN MERCER COUNTY IN CENTRAL NEW JERSEY...
  THIS INCLUDES THE CITY OF TRENTON...
  SOUTHEASTERN BUCKS COUNTY IN SOUTHEAST PENNSYLVANIA...
  EAST CENTRAL MONTGOMERY COUNTY IN SOUTHEAST PENNSYLVANIA...
  NORTHEASTERN PHILADELPHIA COUNTY IN SOUTHEAST PENNSYLVANIA...
  NORTHWESTERN BURLINGTON COUNTY IN SOUTHERN NEW JERSEY...
  NORTHWESTERN CAMDEN COUNTY IN SOUTHERN NEW JERSEY...
  THIS INCLUDES THE CITY OF CAMDEN...

* UNTIL 230 PM EDT

* AT 1021 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
THAT TWO INCHES OF RAIN HAD QUICKLY FALLEN ACROSS PORTIONS OF THE 
WARNED AREA.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO BENSALEM...
  ANDALUSIA...LUMBERTON...JACKSONVILLE...CROSSWICKS...YARDLEY...
  WOODSIDE...TULLYTOWN...RICHBORO...NEWTOWN...LEVITTOWN...
  LANGHORNE...LANGHORNE...IVYLAND...FEASTERVILLE...BRISTOL...
  WILLINGBORO...WHITE HORSE...RIVERSIDE...PALMYRA...MOUNT HOLLY...
  FLORENCE...BURLINGTON...BORDENTOWN AND BEVERLY

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...HIGHWAYS AND UNDERPASSES. ADDITIONALLY...COUNTRY
ROADS AND FARMLANDS ALONG THE BANKS OF CREEKS...STREAMS AND OTHER LOW
LYING AREAS ARE SUBJECT TO FLOODING.

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.

WHEN ENCOUNTERING FLOODED ROADS MAKE THE SMART CHOICE...TURN 
AROUND...DONT DROWN.

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY.
RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE
PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSS
SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY
AUTOMOBILE.

&&

LAT...LON 4004 7501 4011 7497 4013 7503 4023 7520
      4036 7507 4018 7461 3977 7490 3993 7515

$$

KRUZDLO

1 follow-up statement

522 
WGUS71 KPHI 131735
FFSPHI

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
135 PM EDT TUE JUL 13 2010

NJC005-007-021-PAC017-091-101-131740-
/O.CAN.KPHI.FF.W.0006.000000T0000Z-100713T1830Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CAMDEN NJ-MERCER NJ-PHILADELPHIA PA-MONTGOMERY PA-BUCKS PA-
BURLINGTON NJ-
135 PM EDT TUE JUL 13 2010

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR NORTHWESTERN
BURLINGTON...SOUTHEASTERN BUCKS...EAST CENTRAL MONTGOMERY...EASTERN
PHILADELPHIA...SOUTHERN MERCER AND NORTHWESTERN CAMDEN COUNTIES...

WITH THE HEAVY RAIN MOVING TO THE NORTH, THIS FLASH FLOOD WARNING 
HAS BEEN CANCELLED. A SEPARATE FLASH FLOOD WARNING REMAINS IN EFFECT 
FOR NORTHEASTERN PHILADELPHIA.

LAT...LON 4004 7501 4011 7497 4013 7503 4023 7520
      4036 7507 4018 7461 3977 7490 3993 7515

$$

KRUZDLO

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 12, 8:12 PM EDT	Special Weather Statement	PHI	Chester	63 min
Jul 12, 8:40 PM EDT	Special Weather Statement	PHI	Philadelphia	65 min
Jul 12, 9:53 PM EDT	Special Weather Statement	PHI	Bucks, Montgomery	67 min
Jul 12, 10:42 PM EDT	Special Weather Statement	PHI	Berks	63 min
Jul 12, 11:42 PM EDT	Special Weather Statement	PHI	Berks, Lehigh	63 min
Jul 13, 12:52 AM EDT	Areal Flood Advisory	PHI	Berks	3 hr
Jul 13, 1:06 AM EDT	Areal Flood Advisory	PHI	Berks, Chester, Montgomery	3 hr
Jul 13, 4:08 AM EDT	Areal Flood Advisory	PHI	Berks	115 min
Jul 13, 5:58 AM EDT	Special Weather Statement	PHI	Delaware	62 min
Jul 13, 6:07 AM EDT	Areal Flood Advisory	PHI	Chester, Delaware	113 min
Jul 13, 6:20 AM EDT	Flash Flood Warning	PHI	Delaware	115 min
Jul 13, 7:42 AM EDT	Areal Flood Advisory	PHI	Bucks, Chester, Delaware, Montgomery, Philadelphia	4 hr
Jul 13, 9:17 AM EDT	Areal Flood Advisory	PHI	Bucks, Montgomery, Philadelphia	118 min
Jul 13, 9:31 AM EDT	Flash Flood Warning	PHI	Philadelphia	8 hr
Jul 13, 9:41 AM EDT	Flash Flood Warning	PHI	Montgomery, Philadelphia	2 hr
Jul 13, 10:38 AM EDT	Areal Flood Advisory	PHI	Bucks	3 hr
Jul 13, 2:48 PM EDT	Flash Flood Watch	PHI	Delaware, Philadelphia	19 hr
Jul 13, 3:08 PM EDT	Excessive Heat Watch	PHI	Delaware, Philadelphia	63 hr
Jul 13, 5:29 PM EDT	Areal Flood Advisory	PHI	Philadelphia	117 min
Jul 12, 11:21 PM EDT	Special Weather Statement	PHI	Hunterdon, Mercer, Middlesex, Morris, Somerset	84 min
Jul 13, 4:46 AM EDT	Special Weather Statement	PHI	Salem	59 min
Jul 13, 4:48 AM EDT	Special Weather Statement	PHI	Cumberland	57 min
Jul 13, 11:38 AM EDT	Areal Flood Advisory	PHI	Atlantic, Burlington, Monmouth, Ocean	2 hr
Jul 13, 12:19 PM EDT	Areal Flood Advisory	PHI	Morris, Sussex, Warren	2 hr
Jul 13, 2:02 PM EDT	Special Weather Statement	PHI	Burlington	58 min
Jul 13, 2:20 PM EDT	Special Weather Statement	PHI	Monmouth	35 min
Jul 13, 3:00 PM EDT	Special Weather Statement	PHI	Mercer	60 min
Jul 13, 3:15 PM EDT	Coastal Flood Advisory	PHI	Atlantic, Burlington, Cape May, Monmouth, Ocean	9 hr
Jul 13, 4:16 PM EDT	Special Weather Statement	PHI	Ocean	59 min
Jul 13, 4:53 PM EDT	Special Weather Statement	PHI	Monmouth	62 min

Nearby

Flash Flood Warnings in Pennsylvania, 2010 Flash Flood Warnings in New Jersey, 2010 Every flash flood warning in 2010

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.