Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 102, NWS Philadelphia/Mount Holly

June 23, 2008Berks County, Chester County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 23, 2008, 10:54 PM EDT for Berks County, Chester County, Pennsylvania. It was in force for 43 min. 2 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: Jun 23, 2008, 10:54 PM EDT (02:54 UTC)
Expired: Jun 23, 2008, 11:37 PM EDT
In force: 43 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

Counties Berks County, PA, Chester County, PA

The radar

The Philadelphia radar (KDIX), 126 km from the middle of the area, began a volume at 02:58 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
Jun 23, 11:00 PM EDT	TSTM WND DMG	5 E Reading, PA	TREE DOWN IN LOWER ALSACE TOWNSHIP
Jun 23, 11:02 PM EDT	TSTM WND DMG	2 Ne Lorane, PA	TREE DOWN IN EXETER 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, 2.9 hours before the alert went out and 195 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: 263 J/kg
Mixed-layer CIN: -142 J/kg
Mixed-layer LCL: 1398 m above ground
0-6 km bulk shear: 51 kt
0-1 km storm-relative helicity: -26 m²/s²
0-3 km storm-relative helicity: -28 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

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

000 
WUUS51 KPHI 240254
SVRPHI
PAC011-029-240400-
/O.NEW.KPHI.SV.W.0102.080624T0254Z-080624T0400Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1054 PM EDT MON JUN 23 2008

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  BERKS COUNTY IN EASTERN PENNSYLVANIA...
  CHESTER COUNTY IN SOUTHEAST PENNSYLVANIA...

* UNTIL MIDNIGHT EDT

* AT 1053 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 7 MILES SOUTH OF READING...AND
  MOVING NORTHEAST AT 81 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  BIRDSBORO AND 8 MILES NORTHWEST OF CEDARVILLE BY 1100 PM...

LAT...LON 4067 7589 4044 7554 4026 7570 4008 7548
      3977 7581 3997 7600 4004 7595 4010 7595
      4014 7590 4034 7619
TIME...MOT...LOC 0254Z 241DEG 71KT 4024 7593

$$
NIERENBERG

1 follow-up statement

000 
WWUS51 KPHI 240337
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1134 PM EDT MON JUN 23 2008

PAC011-029-240344-
/O.CAN.KPHI.SV.W.0102.000000T0000Z-080624T0400Z/
CHESTER PA-BERKS PA-
1134 PM EDT MON JUN 23 2008

...THE SEVERE THUNDERSTORM WARNING FOR BERKS AND CHESTER COUNTIES IS
CANCELLED...

THERE WERE REPORTS OF TREES DOWN IN LOWER ALSACE AND EXETER 
TOWNSHIPS IN BERKS COUNTY.  HOWEVER, THE STRONGEST WINDS HAVE NOW 
MOVED OUT OF BERKS AND CHESTER COUNTIES.

LAT...LON 4067 7589 4044 7554 4026 7570 4008 7548
      3977 7581 3997 7600 4004 7595 4010 7595
      4014 7590 4034 7619
TIME...MOT...LOC 0334Z 241DEG 71KT 4062 7502

$$

NIERENBERG

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 23, 11:20 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Chester, Lehigh, Montgomery	55 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2008 Every severe thunderstorm warning in 2008

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.