Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2006

Severe Thunderstorm Warning 246, NWS Philadelphia/Mount Holly

August 25, 2006Chester County, Montgomery County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 25, 2006, 11:43 PM EDT for Chester County, Montgomery County, Pennsylvania. It was in force for 47 min. 8 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued
Aug 25, 2006, 11:43 PM EDT (03:43 UTC)
Expired
Aug 26, 2006, 12:30 AM EDT
In force
47 min
Issued by
NWS Philadelphia/Mount Holly
Area
Counties, with a storm outline in the text

Counties Chester County, PA, Montgomery County, PA

The radar

The Philadelphia radar (KDIX), 87 km from the middle of the area, began a volume at 03:43 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.

What was reported inside it

TimeReportWhereRemark
Aug 25, 11:55 PM EDTHAIL 1King Of Prussia, PAQUARTER SIZE HAIL
Aug 25, 11:55 PM EDTHAIL 1King Of Prussia, PAQUARTER SIZE HAIL REPORTED IN KING OF PRUSSIA.
Aug 26, 12:01 AM EDTTSTM WND DMGBridgeport, PAEMERGENCY MANAGMENT OFFICIALS REPORTED 19 HOMES WITH MAJOR STRUCTURAL DAMAGE IN UPPER MERION TOWNSHIP.
Aug 26, 12:02 AM EDTTSTM WND DMGKing Of Prussia, PAA LOT OF ROOFING MATERIAL WAS REPORTEDLY BLOWN OFF A VACANT INDUSTRIAL BUILDING ON SOUTH HENDERSON ROAD. SOME TREES WERE SHEARED OFF HALF WAY UP WITH A LARGE TREE COMPLETELY TOPPLED OVER.
Aug 26, 12:02 AM EDTTSTM WND GST 60King Of Prussia, PATHUNDERSTORM WIND GUST ESTIMATED AT 60 TO 65 MPH IN KING OF PRUSSIA.
Aug 26, 12:02 AM EDTTSTM WND GST 60King Of Prussia, PAWIND ESTIMATED AT 60 TO 65 MPH
Aug 26, 12:02 AM EDTHAIL 0.75King Of Prussia, PAPENNY SIZE HAIL
Aug 26, 12:02 AM EDTHAIL 0.75King Of Prussia, PAPENNY SIZE HAIL REPORTED IN KING OF PRUSSIA.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 00:00Z, 3.7 hours before the alert went out and 212 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 00:00Z on 2006-08-26Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 979 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 00:00Z on 2006-08-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 104 square meters per square second.19395878Sfc1 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
979 J/kg
Mixed-layer CIN
-18 J/kg
Mixed-layer LCL
1772 m above ground
0-6 km bulk shear
45 kt
0-1 km storm-relative helicity
104 m²/s²
0-3 km storm-relative helicity
192 m²/s²
Significant tornado parameter
0.1
Supercell composite
4.3

Open this sounding in Storm Lab

The text

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

000 
WUUS51 KPHI 260343
SVRPHI
PAC029-091-260430-
/O.NEW.KPHI.SV.W.0246.060826T0343Z-060826T0430Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1143 PM EDT FRI AUG 25 2006

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EAST CENTRAL CHESTER COUNTY IN SOUTHEAST PENNSYLVANIA
  SOUTH CENTRAL MONTGOMERY COUNTY IN SOUTHEAST PENNSYLVANIA

* UNTIL 1230 AM EDT

* AT 1139 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING GOLF BALL SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR
  PAOLI...OR ABOUT 15 MILES NORTHWEST OF SPRINGFIELD...AND MOVING
  SOUTHEAST AT 20 MPH.

* THERE HAVE BEEN REPORTS OF NICKEL TO QUARTER SIZE HAIL NEAR        
  KENILWORTH IN CHESTER COUNTY.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  KING OF PRUSSIA BY 1150 PM EDT...
  6 MILES SOUTHWEST OF NORRISTOWN BY 1155 PM EDT...
  8 MILES SOUTHWEST OF PLYMOUTH MEETING BY MIDNIGHT EDT...

LAT...LON 4019 7537 4004 7559 3998 7550 4005 7540
      4010 7527

$$

EBERWINE

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 25, 10:43 PM EDTSevere Thunderstorm WarningPHIBerks32 min
Aug 25, 11:05 PM EDTSevere Thunderstorm WarningPHIChester, Montgomery40 min
Aug 25, 11:53 PM EDTSevere Thunderstorm WarningPHIDelaware52 min
Aug 26, 12:00 AM EDTSevere Thunderstorm WarningPHIPhiladelphia45 min
Aug 26, 1:55 AM EDTSevere Thunderstorm WarningPHIBucks50 min
Aug 26, 2:12 AM EDTSevere Thunderstorm WarningPHICarbon, Lehigh48 min
Aug 26, 3:05 AM EDTSevere Thunderstorm WarningPHIBucks, Lehigh55 min
Aug 26, 3:30 AM EDTSevere Thunderstorm WarningPHIMontgomery45 min
Aug 26, 4:11 AM EDTSevere Thunderstorm WarningPHIPhiladelphia49 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2006Every severe thunderstorm warning in 2006

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.