Alert archive / Pennsylvania / Tornado Warnings in 2009

Tornado Warning 7, NWS State College, PA

July 11, 2009Elk County, Pennsylvania

NWS State College, PA issued this tornado warning at Jul 11, 2009, 7:17 PM EDT for Elk County, Pennsylvania. It was in force for 28 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Jul 11, 2009, 7:17 PM EDT (23:17 UTC)
Expired
Jul 11, 2009, 7:45 PM EDT
In force
28 min
Issued by
NWS State College, PA
Area
Storm-based polygon

County Elk County, PA

The radar

The State College radar (KCCX), 63 km from the middle of the area, began a volume at 23:18 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.

The nearest sounding before it

Pittsburgh, PA (KPIT), launched 12:00Z, 11.3 hours before the alert went out and 167 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, Pittsburgh, PA at 12:00Z on 2009-07-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1949 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Pittsburgh, PA at 12:00Z on 2009-07-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 94 square meters per square second.19395878Sfc1 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
1949 J/kg
Mixed-layer CIN
-18 J/kg
Mixed-layer LCL
560 m above ground
0-6 km bulk shear
25 kt
0-1 km storm-relative helicity
94 m²/s²
0-3 km storm-relative helicity
134 m²/s²
Significant tornado parameter
0.6
Supercell composite
4.0

Open this sounding in Storm Lab

The text

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

000 
WFUS51 KCTP 112317
TORCTP
PAC047-112345-
/O.NEW.KCTP.TO.W.0007.090711T2317Z-090711T2345Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE STATE COLLEGE PA
717 PM EDT SAT JUL 11 2009

THE NATIONAL WEATHER SERVICE IN STATE COLLEGE PA HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTHERN ELK COUNTY IN NORTH CENTRAL PENNSYLVANIA...

* UNTIL 745 PM EDT

* AT 716 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO NEAR BRANDY
  CAMP...OR NEAR RIDGWAY...MOVING EAST AT 25 MPH.

* THE TORNADO WILL BE NEAR...
  FORCE...MEDIX RUN AND BENEZETTE AROUND 745 PM EDT...

THIS WILL IMPACT THE FOLLOWING MAJOR ROADS...ROUTE 219...STATE ROAD
120...STATE ROAD 255.

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.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THE SAFEST PLACE TO BE DURING A TORNADO IS IN A BASEMENT. GET UNDER A
WORKBENCH OR OTHER PIECE OF STURDY FURNITURE. IF NO BASEMENT IS
AVAILABLE...TAKE SHELTER ON THE LOWEST FLOOR OF THE BUILDING IN AN
INTERIOR HALLWAY OR ROOM SUCH AS A CLOSET. USE BLANKETS OR PILLOWS TO
COVER YOUR BODY AND ALWAYS STAY AWAY FROM WINDOWS.

IF IN A MOBILE HOME OR VEHICLE...LEAVE IT AND GET INSIDE A STRONG
BUILDING. IF NO SHELTER IS AVAILABLE...LIE FLAT IN THE NEAREST DITCH
OR OTHER LOW SPOT AND COVER YOUR HEAD WITH YOUR HANDS.

&&

LAT...LON 4135 7828 4123 7833 4125 7865 4133 7884
      4144 7878
TIME...MOT...LOC 2317Z 290DEG 23KT 4135 7871

$$

FORECASTER: STEINBUGL
1 follow-up statement
000 
WWUS51 KCTP 112329
SVSCTP

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
729 PM EDT SAT JUL 11 2009

PAC047-112345-
/O.CON.KCTP.TO.W.0007.000000T0000Z-090711T2345Z/
ELK PA-
729 PM EDT SAT JUL 11 2009

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 745 PM EDT FOR
SOUTHEASTERN ELK COUNTY...

AT 728 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A TORNADO.  THIS TORNADO WAS LOCATED 7 MILES NORTHWEST OF
FORCE...OR 7 MILES SOUTH OF ST. MARYS...MOVING EAST AT 25 MPH.

THIS WILL IMPACT STATE ROAD 255.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THE SAFEST PLACE TO BE DURING A TORNADO IS IN A BASEMENT. GET UNDER A
WORKBENCH OR OTHER PIECE OF STURDY FURNITURE. IF NO BASEMENT IS
AVAILABLE...SEEK SHELTER ON THE LOWEST FLOOR OF THE BUILDING IN AN
INTERIOR HALLWAY OR ROOM SUCH AS A CLOSET. USE BLANKETS OR PILLOWS TO
COVER YOUR BODY AND ALWAYS STAY AWAY FROM WINDOWS.

&&

LAT...LON 4141 7859 4135 7828 4123 7833 4125 7857
      4125 7865 4141 7864
TIME...MOT...LOC 2329Z 290DEG 23KT 4133 7858

$$

FORECASTER: STEINBUGL

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 11, 12:09 PM EDTSpecial Weather StatementCTPBlair36 min
Jul 11, 12:23 PM EDTSpecial Weather StatementCTPMcKean, Warren82 min
Jul 11, 12:43 PM EDTSpecial Weather StatementCTPBedford32 min
Jul 11, 12:46 PM EDTSpecial Weather StatementCTPMcKean, Warren74 min
Jul 11, 12:57 PM EDTAreal Flood AdvisoryCTPMcKean, Warren3 hr
Jul 11, 1:42 PM EDTSpecial Weather StatementCTPMcKean, Potter63 min
Jul 11, 1:47 PM EDTSpecial Weather StatementCTPBlair43 min
Jul 11, 1:57 PM EDTSpecial Weather StatementCTPFulton63 min
Jul 11, 2:04 PM EDTSpecial Weather StatementCTPCentre, Mifflin56 min
Jul 11, 2:27 PM EDTAreal Flood AdvisoryCTPFulton117 min
Jul 11, 2:35 PM EDTAreal Flood AdvisoryCTPCameron, Elk, McKean, Potter, Tioga117 min
Jul 11, 2:48 PM EDTSpecial Weather StatementCTPFranklin57 min
Jul 11, 2:59 PM EDTSpecial Weather StatementCTPLycoming, Tioga76 min
Jul 11, 3:01 PM EDTSevere Thunderstorm WarningCTPAdams, Franklin59 min
Jul 11, 3:38 PM EDTAreal Flood AdvisoryCTPFranklin112 min
Jul 11, 3:52 PM EDTSpecial Weather StatementCTPDauphin, Lebanon53 min
Jul 11, 3:58 PM EDTSpecial Weather StatementCTPAdams62 min
Jul 11, 4:30 PM EDTSpecial Weather StatementCTPLycoming60 min
Jul 11, 4:58 PM EDTSevere Thunderstorm WarningCTPLycoming, Northumberland, Union62 min
Jul 11, 5:13 PM EDTSpecial Weather StatementCTPColumbia, Sullivan62 min
Jul 11, 5:28 PM EDTTornado WarningCTPLycoming, Northumberland, Union32 min
Jul 11, 5:38 PM EDTSpecial Weather StatementCTPWarren37 min
Jul 11, 5:42 PM EDTSevere Thunderstorm WarningCTPColumbia, Montour, Northumberland63 min
Jul 11, 5:46 PM EDTSevere Thunderstorm WarningCTPWarren59 min
Jul 11, 5:51 PM EDTTornado WarningCTPColumbia, Montour, Northumberland54 min
Jul 11, 5:57 PM EDTSevere Thunderstorm WarningCTPCameron, Elk63 min
Jul 11, 6:07 PM EDTSevere Thunderstorm WarningCTPBlair, Cambria, Centre, Clearfield42 min
Jul 11, 6:33 PM EDTSevere Thunderstorm WarningCTPColumbia, Schuylkill87 min
Jul 11, 6:42 PM EDTSevere Thunderstorm WarningCTPBlair, Centre, Clearfield, Huntingdon, Mifflin63 min
Jul 11, 6:43 PM EDTSevere Thunderstorm WarningCTPElk62 min
Jul 11, 7:05 PM EDTSevere Thunderstorm WarningCTPCumberland, Dauphin, Perry40 min
Jul 11, 7:13 PM EDTSpecial Weather StatementCTPAdams, Franklin62 min
Jul 11, 7:19 PM EDTSevere Thunderstorm WarningCTPCentre, Clinton, Huntingdon, Lycoming, Mifflin, Montour and 3 more71 min
Jul 11, 7:32 PM EDTSpecial Weather StatementCTPSchuylkill58 min
Jul 11, 7:44 PM EDTSpecial Weather StatementCTPColumbia, Dauphin, Montour, Northumberland61 min
Jul 11, 7:50 PM EDTSpecial Weather StatementCTPCameron40 min

Nearby

Tornado Warnings in Pennsylvania, 2009Every tornado warning in 2009Tornadoes 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.