Alert archive / Pennsylvania / Flash Flood Warnings in 2011

Flash Flood Warning 50, NWS Philadelphia/Mount Holly

September 7, 2011Berks County, Pennsylvania

NWS Philadelphia/Mount Holly issued this flash flood warning at Sep 7, 2011, 2:05 PM EDT for Berks County, Pennsylvania. It was in force for 4 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 7, 2011, 2:05 PM EDT (18:05 UTC)
Expired
Sep 7, 2011, 6:00 PM EDT
In force
4 hr
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon
Flood severity
None

County Berks County, PA

The radar

The Philadelphia radar (KDIX), 160 km from the middle of the area, began a volume at 18:05 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

Washington/Dulle, VA (KIAD), launched 12:00Z, 6.1 hours before the alert went out and 199 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-pSkew-T log-p diagram, Washington/Dulle, VA at 12:00Z on 2011-09-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Washington/Dulle, VA at 12:00Z on 2011-09-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 154 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
1 J/kg
Mixed-layer CIN
-270 J/kg
Mixed-layer LCL
448 m above ground
0-6 km bulk shear
31 kt
0-1 km storm-relative helicity
154 m²/s²
0-3 km storm-relative helicity
184 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.

969 
WGUS51 KPHI 071805
FFWPHI
PAC011-072200-
/O.NEW.KPHI.FF.W.0050.110907T1805Z-110907T2200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
205 PM EDT WED SEP 7 2011

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  WESTERN BERKS COUNTY...

* UNTIL 600 PM EDT...

* AT 201 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  VERY HEAVY RAIN MOVING NORTH INTO THE WESTERN PORTION OF THE 
  COUNTY. ADDITIONAL THUNDERSTORMS WITH HEAVY RAIN WILL MOVE INTO THE
  AREA DURING THE AFTERNOON. THE ADDITIONAL RAIN WILL RESULT IN FLASH
  FLOODING.

* 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 4052 7636 4052 7630 4054 7618 4060 7605
      4059 7603 4064 7601 4066 7594 4016 7591
      4020 7599 4036 7621 4036 7624 4039 7629
      4050 7644

$$

HAYES
1 follow-up statement
190 
WGUS71 KPHI 072155
FFSPHI

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

PAC011-072203-
/O.EXP.KPHI.FF.W.0050.000000T0000Z-110907T2200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BERKS PA-
555 PM EDT WED SEP 7 2011

...THE FLASH FLOOD WARNING WILL EXPIRE AT 600 PM EDT FOR WESTERN
BERKS COUNTY...

THE WATERS FROM THE EARLIER HEAVY RAINS OVER WESTERN BERKS COUNTY 
ARE RECEDING AND NO LONGER POSE A THREAT TO LIFE OR PROPERTY. 
THEREFORE...THE FLASH FLOOD WARNING WILL BE ALLOWED TO EXPIRE.

HOWEVER...A FLASH FLOOD WARNING REMAINS IN EFFECT FOR EASTERN BERKS 
COUNTY UNTIL 730 PM EDT.

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

LAT...LON 4052 7636 4052 7630 4054 7618 4060 7605
      4059 7603 4064 7601 4066 7594 4016 7591
      4020 7599 4036 7621 4036 7624 4039 7629
      4050 7644

$$

FORECASTER: AMC

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 6, 10:31 PM EDTAreal Flood WarningPHIBerks, Lehigh15 hr
Sep 6, 11:13 PM EDTRiver Flood WarningPHIChester, Montgomery, Philadelphia3 days
Sep 6, 11:19 PM EDTRiver Flood WarningPHIMontgomery17 hr
Sep 7, 12:59 AM EDTRiver Flood WarningPHIChester, Delaware41 hr
Sep 7, 3:40 AM EDTRiver Flood WarningPHIMontgomery, Philadelphia54 hr
Sep 7, 3:47 AM EDTRiver Flood WarningPHIDelaware4 hr
Sep 7, 4:26 AM EDTRiver Flood WarningPHIBerks, Montgomery6 hr
Sep 7, 4:26 AM EDTRiver Flood WarningPHIMontgomery3 days
Sep 7, 9:48 AM EDTRiver Flood WarningPHILehigh, Northampton5 hr
Sep 7, 10:05 AM EDTRiver Flood WarningPHIMonroe, Northampton60 hr
Sep 7, 10:05 AM EDTRiver Flood WarningPHINorthampton67 hr
Sep 7, 10:05 AM EDTRiver Flood WarningPHIBucks68 hr
Sep 7, 10:05 AM EDTRiver Flood WarningPHIBucks67 hr
Sep 7, 10:05 AM EDTRiver Flood WarningPHIBucks67 hr
Sep 7, 10:05 AM EDTRiver Flood WarningPHIBucks64 hr
Sep 7, 10:05 AM EDTRiver Flood WarningPHIBucks67 hr
Sep 7, 10:05 AM EDTRiver Flood WarningPHIBucks68 hr
Sep 7, 11:48 AM EDTCoastal Flood AdvisoryPHIDelaware, Philadelphia18 hr
Sep 7, 1:32 PM EDTSpecial Weather StatementPHIBerks58 min
Sep 7, 1:38 PM EDTSpecial Weather StatementPHILebanon52 min
Sep 7, 1:50 PM EDTAreal Flood AdvisoryPHIBerks17 min
Sep 7, 2:36 PM EDTSpecial Weather StatementPHIBerks54 min
Sep 7, 2:39 PM EDTSpecial Weather StatementPHIChester66 min
Sep 7, 3:06 PM EDTFlash Flood WarningPHIChester4 hr
Sep 7, 3:33 PM EDTFlash Flood WarningPHIBerks, Chester4 hr
Sep 7, 3:49 PM EDTSpecial Weather StatementPHIBerks, Chester56 min
Sep 7, 4:06 PM EDTRiver Flood WarningPHIBerks, Montgomery41 hr
Sep 7, 4:06 PM EDTRiver Flood WarningPHIBerks45 hr
Sep 7, 4:09 PM EDTSpecial Weather StatementPHIBucks, Delaware, Lehigh, Montgomery, Northampton, Philadelphia66 min
Sep 7, 5:10 PM EDTAreal Flood AdvisoryPHIBerks, Bucks, Carbon, Lehigh, Monroe, Montgomery and 1 more3 hr
Sep 7, 6:07 PM EDTRiver Flood WarningPHIChester10 hr
Sep 7, 7:14 PM EDTAreal Flood AdvisoryPHIBerks65 min
Sep 7, 7:21 PM EDTAreal Flood WarningPHIBerks, Chester14 hr
Sep 7, 7:32 PM EDTSpecial Weather StatementPHIBerks58 min
Sep 7, 7:39 PM EDTCoastal Flood WarningPHIDelaware, Philadelphia6 hr

Nearby

Flash Flood Warnings in Pennsylvania, 2011Every 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.