Alert archive / Pennsylvania / Tornado Warnings in 2011

Tornado Warning 34, NWS State College, PA

June 11, 2011Lancaster County, York County, Pennsylvania

NWS State College, PA issued this tornado warning at Jun 11, 2011, 7:56 PM EDT for Lancaster County, York County, Pennsylvania. It was in force for 49 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 11, 2011, 7:56 PM EDT (23:56 UTC)
Expired
Jun 11, 2011, 8:45 PM EDT
In force
49 min
Issued by
NWS State College, PA
Area
Storm-based polygon

Counties Lancaster County, PA, York County, PA

The radar

The Sterling radar (KLWX), 143 km from the middle of the area, began a volume at 23:57 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

TimeReportWhereRemark
Jun 11, 8:15 PM EDTTSTM WND DMG5 Se Mount Joy, PABARN COLLAPSED ON PROSPECT ROAD

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 12:00Z, 11.9 hours before the alert went out and 142 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-pSkew-T log-p diagram, Washington/Dulle, VA at 12:00Z on 2011-06-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 175 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Washington/Dulle, VA at 12:00Z on 2011-06-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 89 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
175 J/kg
Mixed-layer CIN
-275 J/kg
Mixed-layer LCL
1552 m above ground
0-6 km bulk shear
12 kt
0-1 km storm-relative helicity
89 m²/s²
0-3 km storm-relative helicity
153 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.

294 
WFUS51 KCTP 112356
TORCTP
PAC071-133-120045-
/O.NEW.KCTP.TO.W.0034.110611T2356Z-110612T0045Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE STATE COLLEGE PA
756 PM EDT SAT JUN 11 2011

THE NATIONAL WEATHER SERVICE IN STATE COLLEGE PA HAS ISSUED A

* TORNADO WARNING FOR...
  WEST CENTRAL LANCASTER COUNTY IN SOUTH CENTRAL PENNSYLVANIA...
  CENTRAL YORK COUNTY IN SOUTH CENTRAL PENNSYLVANIA...

* UNTIL 845 PM EDT

* AT 753 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THE STORM
  CONTAINING THE POSSIBLE TORNADO WAS NEAR BAINBRIDGE...MOVING       
  EAST SOUTHEAST AT 15 MPH.

* THE TORNADO WILL BE NEAR...
  MAYTOWN AND HALLAM AROUND 805 PM EDT...
  MAYTOWN AROUND 810 PM EDT...
  MARIETTA AROUND 815 PM EDT...
  WRIGHTSVILLE AROUND 820 PM EDT...
  COLUMBIA AROUND 825 PM EDT...
  COLUMBIA AROUND 830 PM EDT...

WHEN A TORNADO WARNING IS ISSUED BASED ON DOPPLER RADAR...IT MEANS
THAT STRONG ROTATION HAS BEEN DETECTED IN THE STORM. A TORNADO MAY
ALREADY BE ON THE GROUND...OR IS EXPECTED TO DEVELOP SHORTLY.

THIS WILL IMPACT ROUTE 30.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF IN MOBILE HOMES OR VEHICLES...EVACUATE THEM AND GET INSIDE A
STURDY SHELTER. IF NO SHELTER IS AVAILABLE...LIE FLAT IN THE NEAREST
DITCH OR OTHER LOW SPOT AND COVER YOUR HEAD WITH YOUR HANDS.

IF YOU ARE CAUGHT OUTSIDE...SEEK SHELTER IN A NEARBY REINFORCED
BUILDING. AS A LAST RESORT...SEEK SHELTER IN A CULVERT...DITCH OR LOW
SPOT AND COVER YOUR HEAD WITH YOUR HANDS.


&&

LAT...LON 4008 7640 3996 7644 4001 7664 4003 7668
      4007 7669 4010 7667
TIME...MOT...LOC 2355Z 285DEG 13KT 4006 7664

$$

FORECASTER: LAMBERT
1 follow-up statement
488 
WWUS51 KCTP 120015
SVSCTP

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
815 PM EDT SAT JUN 11 2011

PAC071-133-120045-
/O.CON.KCTP.TO.W.0034.000000T0000Z-110612T0045Z/
LANCASTER PA-YORK PA-
815 PM EDT SAT JUN 11 2011

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 845 PM EDT FOR CENTRAL
YORK AND WEST CENTRAL LANCASTER COUNTIES...

AT 811 PM EDT...WEATHER SERVICE DOPPLER RADAR CONTINUED TO INDICATE A
SEVERE THUNDERSTORM WITH STRONG ROTATION THAT MAY BE PRODUCING A
TORNADO. THIS STORM THAT MAY BE PRODUCING A TORNADO WAS LOCATED NEAR
WRIGHTSVILLE...OR NEAR COLUMBIA...MOVING SOUTHEAST AT 15 MPH.

THE TORNADO WILL BE NEAR...
COLUMBIA AROUND 820 PM EDT...
MOUNTVILLE AROUND 830 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF IN MOBILE HOMES OR VEHICLES...EVACUATE THEM AND GET INSIDE A
STURDY SHELTER. IF NO SHELTER IS AVAILABLE...LIE FLAT IN THE NEAREST
DITCH OR OTHER LOW SPOT AND COVER YOUR HEAD WITH YOUR HANDS.

IF YOU ARE CAUGHT OUTSIDE...SEEK SHELTER IN A NEARBY REINFORCED
BUILDING. AS A LAST RESORT...SEEK SHELTER IN A CULVERT...DITCH OR LOW
SPOT AND COVER YOUR HEAD WITH YOUR HANDS.

PLEASE REPORT HAIL...STRONG WINDS OR WIND DAMAGE TO THE NATIONAL
WEATHER SERVICE BY CALLING TOLL FREE...1 8 7 7 6 3 3 6 7 7 2.

&&

LAT...LON 4002 7665 4003 7665 4006 7660 4009 7651
      4008 7640 3996 7644 4001 7664
TIME...MOT...LOC 0014Z 296DEG 15KT 4002 7654

$$

FORECASTER: LAMBERT

The office that day

Everything else NWS State College, PA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 11, 1:14 AM EDTSpecial Weather StatementCTPHuntingdon31 min
Jun 11, 2:39 AM EDTSpecial Weather StatementCTPLebanon36 min
Jun 11, 3:22 AM EDTAreal Flood AdvisoryCTPCentre, Clearfield3 hr
Jun 11, 3:31 AM EDTAreal Flood AdvisoryCTPDauphin, Lancaster, Lebanon, Perry, Schuylkill3 hr
Jun 11, 4:33 AM EDTSpecial Weather StatementCTPDauphin, Lebanon42 min
Jun 11, 5:46 AM EDTSpecial Weather StatementCTPColumbia, Lancaster, Lebanon, Montour, Northumberland, Schuylkill44 min
Jun 11, 6:44 AM EDTRiver Flood WarningCTPDauphin, Lebanon, Schuylkill8 hr
Jun 11, 6:44 AM EDTRiver Flood WarningCTPDauphin, Lebanon8 hr
Jun 11, 10:46 AM EDTFlash Flood WatchCTPAdams, Cumberland, Dauphin, Lancaster, Lebanon, Perry and 2 more13 hr
Jun 11, 3:51 PM EDTSpecial Weather StatementCTPBlair54 min
Jun 11, 4:31 PM EDTSpecial Weather StatementCTPHuntingdon59 min
Jun 11, 4:37 PM EDTSpecial Weather StatementCTPClearfield68 min
Jun 11, 4:42 PM EDTSpecial Weather StatementCTPHuntingdon, Mifflin63 min
Jun 11, 5:36 PM EDTSpecial Weather StatementCTPFranklin54 min
Jun 11, 5:46 PM EDTSpecial Weather StatementCTPFulton44 min
Jun 11, 6:02 PM EDTSpecial Weather StatementCTPSullivan43 min
Jun 11, 6:28 PM EDTSpecial Weather StatementCTPHuntingdon62 min
Jun 11, 6:41 PM EDTFlash Flood WarningCTPDauphin, Lebanon, Northumberland, Schuylkill5 hr
Jun 11, 6:44 PM EDTSevere Thunderstorm WarningCTPDauphin, Lebanon61 min
Jun 11, 6:53 PM EDTSpecial Weather StatementCTPLycoming22 min
Jun 11, 6:58 PM EDTTornado WarningCTPLebanon47 min
Jun 11, 7:07 PM EDTSpecial Weather StatementCTPTioga23 min
Jun 11, 7:15 PM EDTTornado WarningCTPDauphin, Lebanon45 min
Jun 11, 7:42 PM EDTSevere Thunderstorm WarningCTPDauphin, Lancaster, Lebanon, York63 min
Jun 11, 7:42 PM EDTTornado WarningCTPLancaster, Lebanon48 min
Jun 11, 7:49 PM EDTTornado WarningCTPLancaster, Lebanon41 min
Jun 11, 7:52 PM EDTSevere Thunderstorm WarningCTPLancaster, York68 min
Jun 11, 7:53 PM EDTFlash Flood WarningCTPLancaster, Lebanon3 hr

Nearby

Tornado Warnings in Pennsylvania, 2011Every tornado warning in 2011Tornadoes 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.