Alert archive / Pennsylvania / Flash Flood Warnings in 2011

Flash Flood Warning 67, NWS Philadelphia/Mount Holly

September 28, 2011Berks County, Chester County, Pennsylvania

NWS Philadelphia/Mount Holly issued this flash flood warning at Sep 28, 2011, 4:36 PM EDT for Berks County, Chester County, Pennsylvania. 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: Sep 28, 2011, 4:36 PM EDT (20:36 UTC)
Expired: Sep 28, 2011, 7:37 PM EDT
In force: 3 hr
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Flood severity: None

Counties Berks County, PA, Chester County, PA

The radar

The Philadelphia radar (KDIX), 121 km from the middle of the area, began a volume at 20:36 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, 8.6 hours before the alert went out and 87 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: 822 J/kg
Mixed-layer CIN: -16 J/kg
Mixed-layer LCL: 526 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 34 m²/s²
0-3 km storm-relative helicity: 65 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

Open this sounding in Storm Lab

The text

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

015 
WGUS51 KPHI 282036
FFWPHI
PAC011-029-290030-
/O.NEW.KPHI.FF.W.0067.110928T2036Z-110929T0030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
436 PM EDT WED SEP 28 2011

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTH CENTRAL CHESTER COUNTY...
  SOUTH CENTRAL BERKS COUNTY...

* UNTIL 830 PM EDT...

* AT 432 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  VERY HEAVY RAIN FROM AN AREA OF SHOWERS AND THUNDERSTORMS OVER 
  NORTH CENTRAL CHESTER AND   SOUTH CENTRAL BERKS COUNTIES. AS MUCH 
  AS 2 INCHES OF RAIN COULD FALL WITH THE SHOWERS AND STORMS.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO READING.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

PLEASE REPORT FLOODING...HAIL OR WIND DAMAGE TO THE NATIONAL WEATHER
SERVICE BY CALLING TOLL FREE...1-877-633-6772.

&&

LAT...LON 4036 7567 4028 7567 4025 7569 4025 7567
      4005 7567 4005 7593 4012 7594 4014 7590
      4017 7594 4034 7596

$$

HAYES

1 follow-up statement

361 
WGUS71 KPHI 282337
FFSPHI

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
737 PM EDT WED SEP 28 2011

PAC011-029-282347-
/O.CAN.KPHI.FF.W.0067.000000T0000Z-110929T0030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CHESTER PA-BERKS PA-
737 PM EDT WED SEP 28 2011

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR SOUTH CENTRAL BERKS
AND NORTH CENTRAL CHESTER COUNTIES...

THE WATERS FROM THE EARLIER HEAVY RAINS ARE RECEDING AND FLOOD WATERS
NO LONGER POSE A THREAT TO LIFE OR PROPERTY. THEREFORE...THE FLASH 
FLOOD WARNING HAS BEEN CANCELLED. HOWEVER...CREEKS AND STREAMS ARE 
RUNNING HIGH FROM EARLIER HEAVY RAIN.

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO READING.

LAT...LON 4036 7567 4028 7567 4025 7569 4025 7567
      4005 7567 4005 7593 4012 7594 4014 7590
      4017 7594 4034 7596

$$

HAYES

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 27, 8:16 PM EDT	Areal Flood Warning	PHI	Carbon, Monroe	3 hr
Sep 27, 11:53 PM EDT	Coastal Flood Statement	PHI	Delaware, Philadelphia	4 hr
Sep 28, 1:54 AM EDT	Special Weather Statement	PHI	Bucks, Delaware, Lehigh, Monroe, Montgomery, Northampton and 1 more	51 min
Sep 28, 3:56 AM EDT	Flash Flood Watch	PHI	Berks, Carbon, Delaware, Lehigh, Monroe, Northampton and 1 more	39 hr
Sep 28, 4:38 AM EDT	Areal Flood Warning	PHI	Bucks	3 hr
Sep 28, 5:45 AM EDT	Special Weather Statement	PHI	Montgomery	60 min
Sep 28, 10:02 AM EDT	Coastal Flood Statement	PHI	Delaware, Philadelphia	8 hr
Sep 28, 11:15 AM EDT	Special Weather Statement	PHI	Berks	60 min
Sep 28, 12:24 PM EDT	Special Weather Statement	PHI	Lehigh	51 min
Sep 28, 3:20 PM EDT	Special Weather Statement	PHI	Chester, Delaware, Montgomery	55 min
Sep 28, 3:59 PM EDT	Special Weather Statement	PHI	Berks, Chester, Delaware, Montgomery	61 min
Sep 28, 4:21 PM EDT	Special Weather Statement	PHI	Carbon	54 min
Sep 28, 4:33 PM EDT	Areal Flood Advisory	PHI	Berks, Chester, Montgomery	2 hr
Sep 28, 4:48 PM EDT	Special Weather Statement	PHI	Northampton	57 min
Sep 28, 4:59 PM EDT	Areal Flood Advisory	PHI	Bucks, Northampton	3 hr
Sep 28, 5:02 PM EDT	Special Weather Statement	PHI	Berks, Lehigh	58 min
Sep 28, 5:12 PM EDT	Special Weather Statement	PHI	Lehigh	63 min
Sep 28, 5:29 PM EDT	Special Weather Statement	PHI	Carbon	61 min
Sep 28, 5:32 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Carbon, Lehigh, Northampton	58 min
Sep 28, 5:42 PM EDT	Areal Flood Advisory	PHI	Berks, Bucks, Carbon, Lehigh, Monroe, Montgomery and 1 more	3 hr
Sep 28, 6:31 PM EDT	Special Weather Statement	PHI	Northampton	59 min
Sep 28, 6:35 PM EDT	Areal Flood Warning	PHI	Bucks	2 hr
Sep 28, 6:41 PM EDT	Flash Flood Warning	PHI	Carbon, Lehigh, Monroe, Northampton	3 hr
Sep 28, 7:44 PM EDT	Areal Flood Warning	PHI	Chester	3 hr

Nearby

Flash Flood Warnings in Pennsylvania, 2011 Every flash 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.