Alert archive / Pennsylvania / Areal Flood Warnings in 2011

Areal Flood Warning 69, NWS Philadelphia/Mount Holly

September 6, 2011Philadelphia County, Pennsylvania

NWS Philadelphia/Mount Holly issued this areal flood warning at Sep 6, 2011, 5:49 PM EDT for Philadelphia County, Pennsylvania. It was in force for 20 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 6, 2011, 5:49 PM EDT (21:49 UTC)
Expired: Sep 7, 2011, 1:43 PM EDT
In force: 20 hr
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Flood severity: None

County Philadelphia County, PA

The radar

The Philadelphia radar (KDIX), 54 km from the middle of the area, began a volume at 21:53 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, 9.8 hours before the alert went out and 110 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 739 m above ground
0-6 km bulk shear: 63 kt
0-1 km storm-relative helicity: 63 m²/s²
0-3 km storm-relative helicity: 555 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

463 
WGUS41 KPHI 062149
FLWPHI

BULLETIN - IMMEDIATE BROADCAST REQUESTED
FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
549 PM EDT TUE SEP 6 2011

PAC101-070145-
/O.NEW.KPHI.FA.W.0069.110906T2149Z-110907T0145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
PHILADELPHIA PA-
549 PM EDT TUE SEP 6 2011

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* FLOOD WARNING FOR URBAN AREAS AND SMALL STREAMS IN...
  NORTHEASTERN PHILADELPHIA COUNTY IN SOUTHEAST PENNSYLVANIA...

* UNTIL 945 PM EDT

* AT 548 PM EDT...THE PENNYPACK CREEK WAS JUST ABOUT AT FLOOD STAGE. 
  ADDITIONAL HEAVY RAIN WILL PUSH THE CREEK OVER FLOOD STAGE THIS
  EVENING. 

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...

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.

A FLOOD WARNING MEANS FLOODING IS OCCURRING OR IS IMMINENT. MOST
FLOOD RELATED DEATHS OCCUR IN AUTOMOBILES. DO NOT ATTEMPT TO CROSS
WATER COVERED BRIDGES...DIPS...OR LOW WATER CROSSINGS. NEVER TRY TO
CROSS A FLOWING STREAM...EVEN A SMALL ONE...ON FOOT. TO ESCAPE RISING
WATER MOVE UP TO HIGHER GROUND.

&&

LAT...LON 4001 7502 4001 7504 3999 7507 3997 7514
      4004 7513 4013 7502 4006 7498 4004 7499
      4003 7499

$$

HAYES

5 follow-up statements

752 
WGUS41 KPHI 070138
FLWPHI

BULLETIN - IMMEDIATE BROADCAST REQUESTED
FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
938 PM EDT TUE SEP 6 2011

PAC101-070445-
/O.EXT.KPHI.FA.W.0069.000000T0000Z-110907T0445Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
PHILADELPHIA PA-
938 PM EDT TUE SEP 6 2011

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS EXTENDED THE

* FLOOD WARNING FOR URBAN AREAS AND SMALL STREAMS IN...
  NORTHEASTERN PHILADELPHIA COUNTY IN SOUTHEAST PENNSYLVANIA...

* UNTIL 1245 AM EDT

* AT 937 PM EDT...THE PENNYPACK CREEK REMAINS JUST ABOVE FLOOD
  STAGE THIS EVENING. WHILE THE HEAVIEST RAIN HAS MOVED TO THE 
  NORTHEAST FOR THE TIME BEING...RUNOFF WILL CONTINUE FOR THE NEXT 
  FEW HOURS. 

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...

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.

A FLOOD WARNING MEANS FLOODING IS OCCURRING OR IS IMMINENT. MOST
FLOOD RELATED DEATHS OCCUR IN AUTOMOBILES. DO NOT ATTEMPT TO CROSS
WATER COVERED BRIDGES...DIPS...OR LOW WATER CROSSINGS. NEVER TRY TO
CROSS A FLOWING STREAM...EVEN A SMALL ONE...ON FOOT. TO ESCAPE RISING
WATER MOVE UP TO HIGHER GROUND.

&&

LAT...LON 4001 7502 4001 7504 3999 7507 3997 7514
      4004 7513 4013 7502 4006 7498 4004 7499
      4003 7499

$$

HAYES

484 
WGUS41 KPHI 070438
FLWPHI

BULLETIN - IMMEDIATE BROADCAST REQUESTED
FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1238 AM EDT WED SEP 7 2011

PAC101-070745-
/O.EXT.KPHI.FA.W.0069.000000T0000Z-110907T0745Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
PHILADELPHIA PA-
1238 AM EDT WED SEP 7 2011

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS EXTENDED THE

* FLOOD WARNING FOR URBAN AREAS AND SMALL STREAMS IN...
  NORTHEASTERN PHILADELPHIA COUNTY IN SOUTHEAST PENNSYLVANIA...

* UNTIL 345 AM EDT

* AT 1237 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED  
  THAT HEAVY RAIN HAS MOVED OUT OF THE AREA. HOWEVER...STREAMS       
  CONTINUE TO RUN HIGH...AND FLOODING CONTINUES IN AREAS OF POOR     
  DRAINAGE. THE AREAL FLOOD WARNING HAS THEREFORE BEEN EXTENDED      
  UNTIL 345 AM EDT.

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.

&&

LAT...LON 4001 7502 4001 7504 3999 7507 3997 7514
      4004 7513 4013 7502 4006 7498 4004 7499
      4003 7499

$$
JJM

083 
WGUS41 KPHI 070722
FLWPHI

BULLETIN - IMMEDIATE BROADCAST REQUESTED FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
322 AM EDT WED SEP 7 2011

PAC101-071345-
/O.EXT.KPHI.FA.W.0069.000000T0000Z-110907T1345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
PHILADELPHIA PA-
322 AM EDT WED SEP 7 2011

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS EXTENDED THE

* FLOOD WARNING FOR URBAN AREAS AND SMALL STREAMS IN...
  NORTHEASTERN PHILADELPHIA COUNTY IN SOUTHEAST PENNSYLVANIA...

* UNTIL 945 AM EDT


* AT 321 AM EDT SMALL STREAMS IN THE AREA WERE STILL RUNNING         
  HIGH FROM EARLIER RAIN. DOPPLER RADAR INDICATED ANOTHER LINE OF    
  SHOWERS MOVING IN FROM THE SOUTH. THE AREAL FLOOD WARNING HAS      
  THEREFORE BEEN EXTENDED UNTIL 945 AM EDT.

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.

LAT...LON 4001 7502 4001 7504 3999 7507 3997 7514
      4004 7513 4013 7502 4006 7498 4004 7499
      4003 7499

$$

JJM

324 
WGUS41 KPHI 071243
FLWPHI

BULLETIN - IMMEDIATE BROADCAST REQUESTED
FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
843 AM EDT WED SEP 7 2011

PAC101-071945-
/O.EXT.KPHI.FA.W.0069.000000T0000Z-110907T1945Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
PHILADELPHIA PA-
843 AM EDT WED SEP 7 2011

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS EXTENDED THE

* FLOOD WARNING FOR URBAN AREAS AND SMALL STREAMS IN...
  NORTHEASTERN PHILADELPHIA COUNTY IN SOUTHEAST PENNSYLVANIA...

* UNTIL 345 PM EDT WEDNESDAY

* AT 842 AM EDT...SMALL STREAM FLOODING CONTINUED ACROSS PORTIONS OF 
THE WARNED AREA. THE WATER LEVEL ON THE PENNYPACK WAS 7.47 FEET AND 
WAS RISING. FLOOD STAGE IS 7.0 FEET. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 4001 7502 4001 7504 3999 7507 3997 7514
      4004 7513 4013 7502 4006 7498 4004 7499
      4003 7499

$$

KRUZDLO

290 
WGUS81 KPHI 071743
FLSPHI

FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
143 PM EDT WED SEP 7 2011

PAC101-071752-
/O.CAN.KPHI.FA.W.0069.000000T0000Z-110907T1945Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
PHILADELPHIA PA-
143 PM EDT WED SEP 7 2011

...THE FLOOD WARNING HAS BEEN CANCELLED FOR URBAN AREAS AND SMALL
STREAMS IN NORTHEASTERN PHILADELPHIA COUNTY...

WATER LEVELS ON THE PENNYPACK CREEK HAVE RECEDED BELOW FLOOD STAGE.

LAT...LON 4001 7502 4001 7504 3999 7507 3997 7514
      4004 7513 4013 7502 4006 7498 4004 7499
      4003 7499

$$

KRUZDLO

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 5, 8:19 PM EDT	Areal Flood Advisory	PHI	Berks, Bucks, Lehigh, Montgomery, Northampton	116 min
Sep 5, 9:32 PM EDT	Areal Flood Warning	PHI	Montgomery	9 hr
Sep 5, 10:18 PM EDT	Flash Flood Warning	PHI	Lehigh, Northampton	4 hr
Sep 5, 10:53 PM EDT	Areal Flood Advisory	PHI	Chester, Montgomery	3 hr
Sep 5, 11:04 PM EDT	Areal Flood Advisory	PHI	Bucks	6 hr
Sep 5, 11:25 PM EDT	Flash Flood Warning	PHI	Berks	4 hr
Sep 6, 12:22 AM EDT	Areal Flood Advisory	PHI	Delaware, Philadelphia	3 hr
Sep 6, 1:42 AM EDT	Areal Flood Advisory	PHI	Chester, Montgomery	3 hr
Sep 6, 2:09 AM EDT	Areal Flood Advisory	PHI	Lehigh, Northampton	3 hr
Sep 6, 3:40 AM EDT	Areal Flood Warning	PHI	Berks	3 hr
Sep 6, 5:43 PM EDT	Areal Flood Advisory	PHI	Bucks, Chester, Delaware, Montgomery, Philadelphia	3 hr
Sep 6, 6:10 PM EDT	Areal Flood Warning	PHI	Bucks, Monroe, Northampton	71 hr
Sep 6, 6:32 PM EDT	Areal Flood Warning	PHI	Montgomery	26 hr
Sep 6, 6:38 PM EDT	Areal Flood Warning	PHI	Montgomery, Philadelphia	23 hr
Sep 6, 6:44 PM EDT	Areal Flood Warning	PHI	Chester, Delaware	15 hr
Sep 6, 6:48 PM EDT	Areal Flood Warning	PHI	Bucks	31 hr
Sep 6, 7:03 PM EDT	River Flood Warning	PHI	Chester	16 hr
Sep 6, 7:41 PM EDT	River Flood Warning	PHI	Delaware	5 hr
Sep 6, 7:52 PM EDT	River Flood Warning	PHI	Bucks	52 hr

Nearby

Areal Flood Warnings in Pennsylvania, 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.