Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 20, NWS Philadelphia/Mount Holly

April 26, 2011Berks County, Carbon County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Apr 26, 2011, 11:34 PM EDT for Berks County, Carbon County, Pennsylvania. It was in force for 56 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: Apr 26, 2011, 11:34 PM EDT (03:34 UTC)
Expired: Apr 27, 2011, 12:30 AM EDT
In force: 56 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

Counties Berks County, PA, Carbon County, PA

The radar

The Philadelphia radar (KDIX), 155 km from the middle of the area, began a volume at 03:35 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
Apr 26, 11:55 PM EDT	TSTM WND DMG	Jim Thorpe, PA	TREES DOWN SCATTERED THROUGHOUT THE CITY

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, 3.6 hours before the alert went out and 243 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 0 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 40 m²/s²
0-3 km storm-relative helicity: 236 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.4

Open this sounding in Storm Lab

The text

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

397 
WUUS51 KPHI 270334
SVRPHI
PAC011-025-270430-
/O.NEW.KPHI.SV.W.0020.110427T0334Z-110427T0430Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1134 PM EDT TUE APR 26 2011

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHWESTERN BERKS COUNTY IN EASTERN PENNSYLVANIA...
  CARBON COUNTY IN NORTHEAST PENNSYLVANIA...
  THIS INCLUDES THE CITY OF LEHIGHTON...

* UNTIL 1230 AM EDT

* AT 1131 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS IN
  EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED ALONG A LINE EXTENDING
  FROM 24 MILES WEST OF LEHIGHTON TO 21 MILES NORTHWEST OF 
  READING...AND MOVING NORTHEAST AT 45 MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  HAMBURG AROUND 1140 PM EDT...
  NESQUEHONING AROUND 1145 PM EDT...
  NEW MAHONING...WEATHERLY AND JIM THORPE AROUND 1150 PM EDT...
  LEHIGHTON AROUND 1155 PM EDT...
  PENN FOREST RESERVOIR...LAKE HARMONY...CHRISTMANS AND BELTZVILLE
  STATE PARK AROUND MIDNIGHT EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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.

&&

LAT...LON 4113 7566 4111 7563 4099 7550 4094 7557
      4083 7549 4074 7576 4078 7585 4069 7589
      4065 7587 4055 7599 4043 7621 4049 7634
      4049 7635 4059 7603 4064 7600 4068 7590
      4078 7586 4091 7600 4100 7576 4110 7577
TIME...MOT...LOC 0333Z 247DEG 55KT 4093 7614 4074 7608
          4059 7614

$$

HAYES

3 follow-up statements

824 
WWUS51 KPHI 270346
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1146 PM EDT TUE APR 26 2011

PAC011-025-270430-
/O.CON.KPHI.SV.W.0020.000000T0000Z-110427T0430Z/
BERKS PA-CARBON PA-
1146 PM EDT TUE APR 26 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1230 AM EDT
FOR CARBON AND NORTHWESTERN BERKS COUNTIES...

AT 1144 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING
WINDS IN EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED ALONG A LINE 
EXTENDING FROM 18 MILES NORTHWEST OF LEHIGHTON TO 20 MILES SOUTHWEST 
OF LEHIGHTON...MOVING NORTHEAST AT 40 MPH.

SEVERE THUNDERSTORMS WILL BE NEAR...
  SUMMIT HILL...LANSFORD AND BEAVER MEADOWS BY 1155 PM EDT...
  NEW MAHONING...WEATHERLY AND NESQUEHONING BY MIDNIGHT EDT...
  JIM THORPE BY 1205 AM EDT...
  WEISSPORT...LEHIGHTON AND EAST SIDE BY 1210 AM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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.

&&

LAT...LON 4113 7566 4111 7563 4099 7550 4094 7557
      4083 7549 4074 7576 4078 7585 4069 7589
      4065 7587 4055 7599 4043 7621 4049 7634
      4049 7635 4059 7603 4064 7600 4068 7590
      4078 7586 4091 7600 4100 7576 4110 7577
TIME...MOT...LOC 0346Z 237DEG 33KT 4097 7600 4078 7595
          4064 7598

$$

HAYES

132 
WWUS51 KPHI 270404
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1204 AM EDT WED APR 27 2011

PAC011-270414-
/O.CAN.KPHI.SV.W.0020.000000T0000Z-110427T0430Z/
BERKS PA-
1204 AM EDT WED APR 27 2011

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN BERKS COUNTY IS
CANCELLED...

LAT...LON 4113 7566 4099 7551 4094 7557 4083 7549
      4079 7560 4078 7570 4077 7570 4075 7578
      4081 7590 4091 7600 4100 7575 4110 7577
TIME...MOT...LOC 0404Z 237DEG 33KT 4108 7575 4088 7569
          4080 7570 4073 7576

$$

PAC025-270430-
/O.CON.KPHI.SV.W.0020.000000T0000Z-110427T0430Z/
CARBON PA-
1204 AM EDT WED APR 27 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1230 AM EDT
FOR CARBON COUNTY...

AT 1201 AM EDT...A LINE OF SEVERE THUNDERSTORMS WAS REPORTED CAPABLE
OF PRODUCING DAMAGING WINDS IN EXCESS OF 60 MPH.  THESE STORMS WERE
LOCATED ALONG A LINE EXTENDING FROM EAST SIDE TO JIM THORPE TO
LEHIGHTON TO 6 MILES SOUTH OF NEW MAHONING...OR ALONG A LINE
EXTENDING FROM 14 MILES SOUTH OF WILKES-BARRE TO LEHIGHTON TO 9 MILES
SOUTHWEST OF LEHIGHTON...MOVING NORTHEAST AT 40 MPH.

SEVERE THUNDERSTORMS WILL BE NEAR...
  CHRISTMANS AND BOWMANSTOWN BY 1210 AM EDT...
  PENN FOREST RESERVOIR...LAKE HARMONY...BELTZVILLE STATE PARK AND
  ALBRIGHTSVILLE BY 1215 AM EDT...
  MECKESVILLE BY 1220 AM EDT...

LAT...LON 4113 7566 4099 7551 4094 7557 4083 7549
      4079 7560 4078 7570 4077 7570 4075 7578
      4081 7590 4091 7600 4100 7575 4110 7577
TIME...MOT...LOC 0404Z 237DEG 33KT 4108 7575 4088 7569
          4080 7570 4073 7576

$$

HAYES

618 
WWUS51 KPHI 270426
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1226 AM EDT WED APR 27 2011

PAC025-270436-
/O.EXP.KPHI.SV.W.0020.000000T0000Z-110427T0430Z/
CARBON PA-
1226 AM EDT WED APR 27 2011

...THE SEVERE THUNDERSTORM WARNING FOR CARBON COUNTY WILL EXPIRE AT
1230 AM EDT...

THE STORMS THAT PROMPTED THE WARNING HAVE MOVED OUT OF THE COUNTY. 

LAT...LON 4113 7566 4099 7551 4094 7557 4083 7549
      4079 7560 4078 7570 4077 7570 4075 7578
      4081 7590 4091 7600 4100 7575 4110 7577
TIME...MOT...LOC 0426Z 237DEG 33KT 4118 7552 4098 7546
          4090 7547 4083 7553

$$

HAYES

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 26, 10:01 PM EDT	Special Weather Statement	PHI	Carbon	59 min
Apr 26, 10:55 PM EDT	Special Weather Statement	PHI	Monroe	50 min
Apr 26, 11:10 PM EDT	Special Weather Statement	PHI	Berks	65 min
Apr 26, 11:41 PM EDT	Special Weather Statement	PHI	Monroe	64 min
Apr 26, 11:45 PM EDT	Special Weather Statement	PHI	Lehigh, Northampton	60 min
Apr 27, 12:08 AM EDT	Special Weather Statement	PHI	Monroe, Northampton	67 min
Apr 27, 12:34 AM EDT	Severe Thunderstorm Warning	PHI	Monroe, Northampton	56 min
Apr 27, 1:19 AM EDT	Special Weather Statement	PHI	Bucks	56 min
Apr 27, 1:48 PM EDT	Special Weather Statement	PHI	Delaware, Montgomery, Philadelphia	87 min
Apr 27, 2:31 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Delaware, Montgomery, Philadelphia	44 min
Apr 27, 3:26 PM EDT	Flash Flood Watch	PHI	Carbon, Lehigh, Monroe, Northampton	24 hr
Apr 27, 4:43 PM EDT	Severe Thunderstorm Warning	PHI	Delaware	36 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2011 Every severe thunderstorm warning in 2011

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.