Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 64, NWS Philadelphia/Mount Holly

June 10, 2009Berks County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 10, 2009, 5:13 PM EDT for Berks County, Pennsylvania. It was in force for 47 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: Jun 10, 2009, 5:13 PM EDT (21:13 UTC)
Expired: Jun 10, 2009, 6:00 PM EDT
In force: 47 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

County Berks County, PA

The radar

The State College radar (KCCX), 156 km from the middle of the area, began a volume at 21:15 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 10, 6:10 PM EDT	HAIL 0.88	Womelsdorf, PA	PENNY TO NICKEL SIZED HAIL REPORTED IN WOMELSDORF.

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

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 9.2 hours before the alert went out and 115 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: 13 J/kg
Mixed-layer CIN: -219 J/kg
Mixed-layer LCL: 980 m above ground
0-6 km bulk shear: 8 kt
0-1 km storm-relative helicity: 12 m²/s²
0-3 km storm-relative helicity: 21 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 
WUUS51 KPHI 102113
SVRPHI
PAC011-102200-
/O.NEW.KPHI.SV.W.0064.090610T2113Z-090610T2200Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
513 PM EDT WED JUN 10 2009

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  WESTERN BERKS COUNTY IN EASTERN PENNSYLVANIA...

* UNTIL 600 PM EDT

* AT 512 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING NICKEL SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED 10
  MILES WEST OF STRAUSSTOWN...OR 26 MILES NORTHWEST OF 
READING...AND   MOVING EAST AT 15 MPH. THIS STORM COULD ALSO PRODUCE 
TORRENTIAL DOWNPOURS.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  STRAUSSTOWN AROUND 555 PM EDT...
  BERNVILLE AND 6 MILES NORTH OF WOMELSDORF AROUND 600 PM EDT...

LAT...LON 4051 7643 4053 7634 4052 7630 4053 7627
      4054 7618 4056 7615 4058 7611 4057 7585
      4027 7602 4040 7630 4049 7644
TIME...MOT...LOC 2112Z 290DEG 12KT 4051 7637

$$

EBERWINE

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 10, 6:02 PM EDT	Severe Thunderstorm Warning	PHI	Berks	58 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2009 Every severe thunderstorm 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.