Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 77, NWS Philadelphia/Mount Holly

June 13, 2007Berks County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 13, 2007, 2:37 PM EDT for Berks County, Pennsylvania. It was in force for 83 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 13, 2007, 2:37 PM EDT (18:37 UTC)
Expired: Jun 13, 2007, 4:00 PM EDT
In force: 83 min
Issued by: NWS Philadelphia/Mount Holly
Area: Counties, with a storm outline in the text

County Berks County, PA

The radar

The Philadelphia radar (KDIX), 138 km from the middle of the area, began a volume at 18:40 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 13, 3:40 PM EDT	TSTM WND DMG	8 Nw Womelsdorf, PA	WIRES DOWN ON ROUTE 501

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.

Issued	Product	Office	Lasted
Jun 13, 1:24 PM EDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 6.6 hours before the alert went out and 112 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: 494 J/kg
Mixed-layer CIN: -45 J/kg
Mixed-layer LCL: 825 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: 5 m²/s²
0-3 km storm-relative helicity: 27 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 131838
SVRPHI
PAC011-132000-
/O.NEW.KPHI.SV.W.0077.070613T1837Z-070613T2000Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
237 PM EDT WED JUN 13 2007

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  BERKS COUNTY IN EASTERN PENNSYLVANIA...
  THIS INCLUDES THE CITY OF READING...

* UNTIL 400 PM EDT

* AT 235 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED 9 MILES
  NORTH OF LENHARTSVILLE...OR ABOUT 22 MILES WEST OF ALLENTOWN...AND
  MOVING SOUTHWEST AT 20 MPH. IN ADDITION, THERE WERE OTHER THUNDERSTORMS
  LOCATED OVER THE SOUTHERN PART OF THE COUNTY THAT COULD PRODUCE HAIL
  AND DAMAGING WINDS.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  LENHARTSVILLE BY 255 PM EDT...
  HAMBURG BY 310 PM EDT...
  8 MILES NORTHWEST OF LEESPORT BY 325 PM EDT...
  STRAUSSTOWN AND BERNVILLE BY 340 PM EDT...
  WOMELSDORF AND 9 MILES NORTHWEST OF WERNERSVILLE BY 355 PM EDT...

THESE ARE DANGEROUS STORMS. IF YOU ARE IN THEIR PATH...PREPARE
IMMEDIATELY FOR DAMAGING WINDS...DESTRUCTIVE HAIL...AND DEADLY CLOUD
TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.

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 4061 7577 4070 7590 4044 7633 4013 7588
      4027 7570

$$

RNS

2 follow-up statements

000 
WWUS51 KPHI 131907
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
307 PM EDT WED JUN 13 2007

PAC011-132000-
/O.CON.KPHI.SV.W.0077.000000T0000Z-070613T2000Z/
BERKS PA-
307 PM EDT WED JUN 13 2007

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 400 PM EDT
FOR WESTERN BERKS COUNTY...

AT 304 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS
LOCATED NEAR HAMBURG...OR ABOUT 18 MILES NORTH OF READING...MOVING
SOUTHWEST AT 25 MPH. ANOTHER THUNDERSTORM CAPABLE OF PRODUCING DAMAGING
WINDS AND HAIL WAS LOCATED NEAR SHOEMAKERSVILLE. THIS STORM WAS ALSO
MOVING TO THE SOUTHWEST AT 25 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  CENTERPORT AND 9 MILES NORTHWEST OF LEESPORT BY 315 PM EDT...
  STRAUSSTOWN AND BERNVILLE BY 330 PM EDT...
  7 MILES NORTHWEST OF ROBESONIA BY 340 PM EDT...
  WOMELSDORF BY 345 PM EDT...

THESE ARE DANGEROUS STORMS. IF YOU ARE IN ITS PATH...PREPARE
IMMEDIATELY FOR DAMAGING WINDS...DESTRUCTIVE HAIL...AND DEADLY CLOUD
TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.

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 4062 7587 4070 7590 4049 7639 4013 7588
      4021 7586

$$

RNS

000 
WWUS51 KPHI 131940
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
340 PM EDT WED JUN 13 2007

PAC011-132000-
/O.CON.KPHI.SV.W.0077.000000T0000Z-070613T2000Z/
BERKS PA-
340 PM EDT WED JUN 13 2007

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 400 PM EDT
FOR WEST CENTRAL BERKS COUNTY...

AT 339 PM EDT...A SEVERE THUNDERSTORM WAS REPORTED CAPABLE OF
PRODUCING QUARTER SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.
THIS STORM WAS LOCATED NEAR WOMELSDORF...OR ABOUT 14 MILES WEST OF
READING...MOVING SOUTHWEST AT 25 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  WOMELSDORF AND ROBESONIA BY 345 PM EDT...

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE
IMMEDIATELY FOR DAMAGING WINDS...DESTRUCTIVE HAIL...AND DEADLY CLOUD
TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.

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 4050 7611 4054 7624 4050 7645 4029 7611
      4036 7604

$$

RNS

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 12, 8:27 PM EDT	Severe Thunderstorm Warning	PHI	Bucks	63 min
Jun 13, 4:26 AM EDT	Coastal Flood Advisory	PHI	Delaware, Philadelphia	23 hr
Jun 13, 1:59 PM EDT	Severe Thunderstorm Warning	PHI	Carbon, Lehigh	61 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2007 Every severe thunderstorm warning in 2007

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.