Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2006

Severe Thunderstorm Warning 247, NWS Philadelphia/Mount Holly

August 25, 2006Delaware County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 25, 2006, 11:53 PM EDT for Delaware County, Pennsylvania. It was in force for 52 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: Aug 25, 2006, 11:53 PM EDT (03:53 UTC)
Expired: Aug 26, 2006, 12:45 AM EDT
In force: 52 min
Issued by: NWS Philadelphia/Mount Holly
Area: Counties, with a storm outline in the text

County Delaware County, PA

The radar

The Philadelphia radar (KDIX), 82 km from the middle of the area, began a volume at 03:55 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

Time	Report	Where	Remark
Aug 25, 11:58 PM EDT	TSTM WND DMG	Radnor Township, PA	WIRES REPORTED DOWN IN RADNOR TOWNSHIP.

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, 3.9 hours before the alert went out and 209 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: 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 260353
SVRPHI
PAC045-260445-
/O.NEW.KPHI.SV.W.0247.060826T0353Z-060826T0445Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1153 PM EDT FRI AUG 25 2006

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEASTERN DELAWARE COUNTY IN SOUTHEAST PENNSYLVANIA
  THIS INCLUDES THE CITY OF SPRINGFIELD

* UNTIL 1245 AM EDT

* AT 1151 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
  RADNOR TOWNSHIP...OR ABOUT 11 MILES NORTH OF SPRINGFIELD...AND
  MOVING SOUTHEAST AT 20 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  RADNOR TOWNSHIP BY MIDNIGHT EDT...
  BROOMALL BY 1210 AM EDT...
  DREXEL HILL AND SPRINGFIELD BY 1215 AM EDT...

LAT...LON 4006 7539 4000 7545 3993 7547 3991 7533
      3997 7528 4000 7531

$$

EBERWINE

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 25, 10:43 PM EDT	Severe Thunderstorm Warning	PHI	Berks	32 min
Aug 25, 11:05 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Montgomery	40 min
Aug 25, 11:43 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Montgomery	47 min
Aug 26, 12:00 AM EDT	Severe Thunderstorm Warning	PHI	Philadelphia	45 min
Aug 26, 1:55 AM EDT	Severe Thunderstorm Warning	PHI	Bucks	50 min
Aug 26, 2:12 AM EDT	Severe Thunderstorm Warning	PHI	Carbon, Lehigh	48 min
Aug 26, 3:05 AM EDT	Severe Thunderstorm Warning	PHI	Bucks, Lehigh	55 min
Aug 26, 3:30 AM EDT	Severe Thunderstorm Warning	PHI	Montgomery	45 min
Aug 26, 4:11 AM EDT	Severe Thunderstorm Warning	PHI	Philadelphia	49 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2006 Every 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.