Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2006

Severe Thunderstorm Warning 215, NWS Philadelphia/Mount Holly

July 28, 20064 counties in Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 28, 2006, 2:28 PM EDT for 4 counties in Pennsylvania. It was in force for 62 min. 1 report 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
Jul 28, 2006, 2:28 PM EDT (18:28 UTC)
Expired
Jul 28, 2006, 3:30 PM EDT
In force
62 min
Issued by
NWS Philadelphia/Mount Holly
Area
Counties, with a storm outline in the text

Counties Chester County, PA, Delaware County, PA, Montgomery County, PA, Philadelphia County, PA

The radar

The Philadelphia radar (KDIX), 91 km from the middle of the area, began a volume at 18:31 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
Jul 28, 2:50 PM EDTTSTM WND DMGRadnor Township, PATREES DOWN IN RADNOR TWP, ASTIN TWP, AND THORBURY TWP.

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

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Jul 28, 1:00 PM EDTSevere Thunderstorm WatchSPC7 hr

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 6.5 hours before the alert went out and 78 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, Phillips Aaf/Abe, MD at 12:00Z on 2006-07-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 411 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Phillips Aaf/Abe, MD at 12:00Z on 2006-07-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 83 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
411 J/kg
Mixed-layer CIN
-78 J/kg
Mixed-layer LCL
1201 m above ground
0-6 km bulk shear
23 kt
0-1 km storm-relative helicity
83 m²/s²
0-3 km storm-relative helicity
106 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.7

Open this sounding in Storm Lab

The text

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

000 
WUUS51 KPHI 281829
SVRPHI
PAC029-045-091-101-281930-
/O.NEW.KPHI.SV.W.0215.060728T1828Z-060728T1930Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
228 PM EDT FRI JUL 28 2006

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EAST CENTRAL CHESTER COUNTY IN SOUTHEAST PENNSYLVANIA
  NORTHERN DELAWARE COUNTY IN SOUTHEAST PENNSYLVANIA
  THIS INCLUDES THE CITY OF SPRINGFIELD
  SOUTH CENTRAL MONTGOMERY COUNTY IN SOUTHEAST PENNSYLVANIA
  WEST CENTRAL PHILADELPHIA COUNTY IN SOUTHEAST PENNSYLVANIA

* UNTIL 330 PM EDT

* AT 227 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS
  OF 60 MPH.  THIS STORM WAS LOCATED NEAR WEST CHESTER...OR ABOUT 12
  MILES WEST OF SPRINGFIELD...AND MOVING EAST AT 30 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  LIMA BY 235 PM EDT...
  BROOMALL...SPRINGFIELD...RADNOR TOWNSHIP AND SWARTHMORE BY 240 PM
  EDT...
  DREXEL HILL...BRYN MAWR...EAST LANSDOWNE AND YEADON BY 245 PM
  EDT...

IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...CONTINUOUS CLOUD TO
GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS
IMMEDIATELY LIGHTNING IS ONE OF NATURES NUMBER ONE KILLERS.
REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE
STRUCK BY LIGHTNING.

LAT...LON 4002 7562 3985 7564 3992 7517 4012 7533

$$

WN
2 follow-up statements
000 
WWUS51 KPHI 281847
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
244 PM EDT FRI JUL 28 2006

PAC029-281854-
/O.CAN.KPHI.SV.W.0215.000000T0000Z-060728T1930Z/
CHESTER PA-
244 PM EDT FRI JUL 28 2006

...THE SEVERE THUNDERSTORM WARNING FOR CHESTER COUNTY IS CANCELLED...

THE SEVERE STORM HAS MOVED INTO DELAWARE COUNTY.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM EDT FRIDAY
EVENING FOR SOUTHWESTERN DELAWARE AND NORTHEASTERN MARYLAND AND
NORTHWESTERN NEW JERSEY AND EASTERN PENNSYLVANIA.

LAT...LON 3993 7517 3986 7561 3999 7544 4000 7545
      4003 7541 4005 7542 4006 7537 4008 7539
      4007 7541 4009 7542 4012 7533

$$

PAC045-091-101-281930-
/O.CON.KPHI.SV.W.0215.000000T0000Z-060728T1930Z/
DELAWARE PA-PHILADELPHIA PA-MONTGOMERY PA-
244 PM EDT FRI JUL 28 2006

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 330 PM EDT
FOR SOUTHERN MONTGOMERY...PHILADELPHIA AND DELAWARE COUNTIES...

AT 240 PM EDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING 
DAMAGING WINDS IN EXCESS OF 65 MPH WAS LOCATED NEAR LIMA...
OR ABOUT 9 MILES NORTHWEST OF SPRINGFIELD...MOVING EAST AT 30 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  BROOMALL BY 250 PM EDT...
  RADNOR TOWNSHIP...KING OF PRUSSIA AND DREXEL HILL BY 255 PM EDT...
  BRYN MAWR...ARDMORE...WEST CONSHOHOCKEN AND CONSHOHOCKEN BY 300 PM
  EDT...
  NARBERTH AND MILLBOURNE BY 305 PM EDT...

THIS STORM HAS DOWNED NUMEROUS TREES AND WIRES IN CHESTER COUNTY.
PLEASE TAKE SHELTER IMMEDIATELY. THIS IS A DANGEROUS AND LIFE THREATENING
STORM. DO NOT VENTURE OUTDOORS UNTIL THIS STORM PASSES.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM EDT FRIDAY
EVENING FOR SOUTHWESTERN DELAWARE AND NORTHEASTERN MARYLAND AND
NORTHWESTERN NEW JERSEY AND EASTERN PENNSYLVANIA.

LAT...LON 3993 7517 3986 7561 3999 7544 4000 7545
      4003 7541 4005 7542 4006 7537 4008 7539
      4007 7541 4009 7542 4012 7533

$$
 
TFG
000 
WWUS51 KPHI 281914
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
313 PM EDT FRI JUL 28 2006

PAC045-091-281923-
/O.CAN.KPHI.SV.W.0215.000000T0000Z-060728T1930Z/
DELAWARE PA-MONTGOMERY PA-
313 PM EDT FRI JUL 28 2006

...THE SEVERE THUNDERSTORM WARNING FOR MONTGOMERY AND DELAWARE
COUNTIES IS CANCELLED...

THE SEVERE STORM IS NOW IN BUCKS AND PHILADELPHIA COUNTIES.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM EDT FRIDAY
EVENING FOR SOUTHWESTERN DELAWARE AND NORTHEASTERN MARYLAND AND
NORTHWESTERN NEW JERSEY AND EASTERN PENNSYLVANIA.

LAT...LON 4006 7494 3996 7513 3996 7528 3998 7527
      4000 7524 4003 7520 4005 7520 4006 7517
      4007 7509 4006 7512 4008 7505 4012 7503

$$

PAC101-281930-
/O.CON.KPHI.SV.W.0215.000000T0000Z-060728T1930Z/
PHILADELPHIA PA-
313 PM EDT FRI JUL 28 2006

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 330 PM EDT
FOR PHILADELPHIA COUNTY...

AT 309 PM EDT...A SEVERE THUNDERSTORM WAS REPORTED.  THIS STORM WAS
LOCATED NEAR PHILADELPHIA...MOVING EAST AT 25 MPH. WIND GUSTS TO
69 MPH WERE REPORTED AT ROXBOROUGH AND 57 MPH AT NORTHEAST PHILADELPHIA 
AIRPORT.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM EDT FRIDAY
EVENING FOR SOUTHWESTERN DELAWARE AND NORTHEASTERN MARYLAND AND
NORTHWESTERN NEW JERSEY AND EASTERN PENNSYLVANIA.

LAT...LON 4006 7494 3996 7513 3996 7528 3998 7527
      4000 7524 4003 7520 4005 7520 4006 7517
      4007 7509 4006 7512 4008 7505 4012 7503

$$ 

TFG

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 27, 10:55 PM EDTSevere Thunderstorm WarningPHIChester65 min
Jul 27, 11:32 PM EDTSevere Thunderstorm WarningPHIDelaware, Montgomery88 min
Jul 28, 12:32 AM EDTSevere Thunderstorm WarningPHIPhiladelphia43 min
Jul 28, 12:40 AM EDTFlash Flood WarningPHIBucks, Montgomery, Philadelphia3 hr
Jul 28, 12:40 AM EDTSevere Thunderstorm WarningPHIBucks65 min
Jul 28, 2:49 PM EDTSevere Thunderstorm WarningPHIPhiladelphia56 min
Jul 28, 3:07 PM EDTSevere Thunderstorm WarningPHIBucks53 min
Jul 28, 4:03 PM EDTSevere Thunderstorm WarningPHIBucks, Montgomery57 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.