Alert archive / Pennsylvania / Flash Flood Warnings in 2009

Flash Flood Warning 31, NWS Philadelphia/Mount Holly

August 2, 2009Berks County, Pennsylvania

NWS Philadelphia/Mount Holly issued this flash flood warning at Aug 2, 2009, 4:22 PM EDT for Berks County, Pennsylvania. It was in force for 2 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
Aug 2, 2009, 4:22 PM EDT (20:22 UTC)
Expired
Aug 2, 2009, 6:23 PM EDT
In force
2 hr
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon
Flood severity
None

County Berks County, PA

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 8.4 hours before the alert went out and 205 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 2009-08-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 633 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 2009-08-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 0 square meters per square second.1939Sfc1 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
633 J/kg
Mixed-layer CIN
-76 J/kg
Mixed-layer LCL
689 m above ground
0-6 km bulk shear
0 kt
0-1 km storm-relative helicity
0 m²/s²
0-3 km storm-relative helicity
0 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.

000 
WGUS51 KPHI 022022
FFWPHI
PAC011-030015-
/O.NEW.KPHI.FF.W.0031.090802T2022Z-090803T0015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
422 PM EDT SUN AUG 2 2009

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  BERKS COUNTY IN EASTERN PENNSYLVANIA...
  THIS INCLUDES THE CITY OF READING...

* UNTIL 815 PM EDT

* AT 418 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  SLOW MOVING SHOWERS AND THUNDERSTORMS WITH HEAVY RAIN IN THE
  NORTHERN AND WESTERN PARTS OF THE COUNTY.  THE SHOWERS AND
  THUNDERSTORMS WILL CONTINUE TO DRIFT TO THE EAST, AND THEY MAY
  DROP AN ADDITIONAL TWO INCHES OF RAIN ON SOME LOCATIONS THAT
  ALREADY RECEIVED HEAVY RAIN EARLIER TODAY.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  READING...STRAUSSTOWN...KUTZTOWN AND HAMBURG.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOST FLOOD DEATHS OCCUR IN AUTOMOBILES. NEVER DRIVE YOUR VEHICLE INTO
AREAS WHERE THE WATER COVERS THE ROADWAY. FLOOD WATERS ARE USUALLY
DEEPER THAN THEY APPEAR. JUST ONE FOOT OF FLOWING WATER IS POWERFUL
ENOUGH TO SWEEP VEHICLES OFF THE ROAD. WHEN ENCOUNTERING FLOODED
ROADS MAKE THE SMART CHOICE...TURN AROUND...DONT DROWN.

&&

LAT...LON 4053 7634 4054 7618 4057 7614 4057 7609
      4059 7605 4058 7602 4064 7600 4068 7590
      4044 7553 4024 7570 4014 7589 4036 7621
      4039 7630 4050 7644

$$

IOVINO
1 follow-up statement
000 
WGUS71 KPHI 022223
FFSPHI

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
623 PM EDT SUN AUG 2 2009

PAC011-022233-
/O.CAN.KPHI.FF.W.0031.000000T0000Z-090803T0015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BERKS PA-
623 PM EDT SUN AUG 2 2009

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR BERKS COUNTY...

THE THUNDERSTORMS HAVE WEAKENED AND NO LONGER POSE A FLASH FLOOD
THREAT.

LAT...LON 4053 7634 4054 7618 4057 7614 4057 7609
      4059 7605 4058 7602 4064 7600 4068 7590
      4044 7553 4024 7570 4014 7589 4036 7621
      4039 7630 4050 7644

$$
 
TFG

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 2, 2:19 AM EDTFlash Flood WatchPHIBerks, Carbon, Delaware, Lehigh, Monroe, Northampton and 1 more13 hr
Aug 2, 3:29 AM EDTAreal Flood AdvisoryPHIBerks3 hr
Aug 2, 5:54 AM EDTAreal Flood AdvisoryPHIChester3 hr
Aug 2, 7:34 AM EDTAreal Flood AdvisoryPHIBucks, Montgomery, Philadelphia3 hr
Aug 2, 7:51 AM EDTAreal Flood WarningPHIChester4 hr
Aug 2, 9:04 AM EDTAreal Flood WarningPHIMontgomery, Philadelphia4 hr
Aug 2, 9:06 AM EDTFlash Flood WarningPHIBerks, Carbon, Chester, Lehigh, Monroe, Northampton4 hr
Aug 2, 10:08 AM EDTFlash Flood WarningPHIBucks, Chester, Delaware, Montgomery, Philadelphia9 hr
Aug 2, 10:08 AM EDTSevere Thunderstorm WarningPHIChester67 min
Aug 2, 10:24 AM EDTSevere Thunderstorm WarningPHIChester, Delaware, Montgomery66 min
Aug 2, 10:53 AM EDTSevere Thunderstorm WarningPHIChester, Delaware, Montgomery, Philadelphia67 min
Aug 2, 11:14 AM EDTSevere Thunderstorm WarningPHIBucks, Lehigh, Montgomery, Northampton61 min
Aug 2, 11:25 AM EDTSevere Thunderstorm WarningPHIBucks, Montgomery, Philadelphia65 min
Aug 2, 11:48 AM EDTSevere Thunderstorm WarningPHIBucks57 min
Aug 2, 11:51 AM EDTTornado WarningPHIBucks24 min
Aug 2, 12:33 PM EDTRiver Flood WarningPHIBucks28 hr
Aug 2, 1:25 PM EDTAreal Flood WarningPHIMontgomery, Philadelphia6 hr
Aug 2, 4:06 PM EDTAreal Flood AdvisoryPHIBerks, Carbon, Lehigh, Monroe, Northampton4 hr
Aug 2, 4:21 PM EDTRiver Flood WarningPHIChester56 min
Aug 2, 6:15 PM EDTAreal Flood WarningPHIMontgomery, Philadelphia4 hr
Aug 2, 6:25 PM EDTAreal Flood WarningPHIPhiladelphia4 hr

Nearby

Flash Flood Warnings in Pennsylvania, 2009Every flash flood warning in 2009

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.