Alert archive / Pennsylvania / Tornado Warnings in 2018

Tornado Warning 7, NWS State College, PA

May 15, 20184 counties in Pennsylvania

NWS State College, PA issued this tornado warning at May 15, 2018, 4:14 PM EDT for 4 counties in Pennsylvania. It was in force for 31 min. 4 reports 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
May 15, 2018, 4:14 PM EDT (20:14 UTC)
Expired
May 15, 2018, 4:45 PM EDT
In force
31 min
Issued by
NWS State College, PA
Area
Storm-based polygon
Tornado
Radar indicated
Hail
1.0 in

Counties Cumberland County, PA, Dauphin County, PA, Perry County, PA, York County, PA

The radar

The State College radar (KCCX), 133 km from the middle of the area, began a volume at 20:17 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
May 15, 4:15 PM EDTTORNADO2 Nnw Enola, PAAN EF1 TORNADO KNOCKED DOWN A FEW DOZEN TREES AND DESTROYED A SHED JUST NORTH OF BELLE VISTA DRIVE TO THE NORTH-NORTHWEST OF ENOLA. THE PATH LENGTH WAS 200 YARDS AND THE MAXIMUM PATH WIDTH WAS 40 YARDS.
May 15, 4:17 PM EDTTSTM WND DMG1 N Rockville, PATREES AND WIRES DOWN AT NORTH FRONT STREET AND MILLER LANE
May 15, 4:20 PM EDTTSTM WND DMG1 Sse Rockville, PATREES INTO HOUSES ON GREEN STREET
May 15, 4:26 PM EDTHAIL 1Mechanicsburg, PA

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.

IssuedProductOfficeLasted
May 15, 12:26 PM EDTSevere Thunderstorm WatchSPC7 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 8.2 hours before the alert went out and 150 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 2018-05-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 47 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, Washington/Dulle, VA at 12:00Z on 2018-05-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 117 square meters per square second.193958Sfc1 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
47 J/kg
Mixed-layer CIN
-484 J/kg
Mixed-layer LCL
1259 m above ground
0-6 km bulk shear
21 kt
0-1 km storm-relative helicity
117 m²/s²
0-3 km storm-relative helicity
79 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

410 
WFUS51 KCTP 152014
TORCTP
PAC041-043-099-133-152045-
/O.NEW.KCTP.TO.W.0007.180515T2014Z-180515T2045Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service State College PA
414 PM EDT TUE MAY 15 2018

The National Weather Service in State College PA has issued a

* Tornado Warning for...
  North central York County in south central Pennsylvania...
  Southern Dauphin County in south central Pennsylvania...
  East central Perry County in south central Pennsylvania...
  Northeastern Cumberland County in south central Pennsylvania...

* Until 445 PM EDT

* At 414 PM EDT, severe thunderstorms capable of producing both 
  tornadoes and extensive straight line wind damage were located 
  west of Enola, moving east at 40 mph.

  HAZARD...Tornado and quarter size hail.

  SOURCE...Radar indicated rotation.

  IMPACT...Flying debris will be dangerous to those caught without 
           shelter. Mobile homes will be damaged or destroyed. 
           Damage to roofs, windows, and vehicles will occur.  Tree 
           damage is likely.

* These dangerous storms will be near...
  New Cumberland, Harrisburg, Steelton, Progress and Penbrook around 
  420 PM EDT.
  Hummelstown, Middletown, Colonial Park, Linglestown, Rutherford, 
  Lawnton, Bressler-Enhaut-Oberlin, Highspire, Paxtang and Paxtonia 
  around 430 PM EDT.
  Hershey and Palmyra around 440 PM EDT.

Other locations impacted by this tornadic thunderstorm include Three
Mile Island, Goldsboro, Capital City Airport, Newberrytown, City
Island, Penn State Harrisburg, Harrisburg International Airport,
Hershey Park, Harrisburg Area Community College and Penn State
College Of Medicine.

This includes the following Interstates...
 The Pennsylvania Turnpike from mile markers 229 to 258.
 Interstate 81 from mile markers 54 to 78.
 Interstate 83 from mile markers 32 to 50.
 Interstate 283 from mile markers 0 to 2.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

Heavy rainfall may hide this tornado. Do not wait to see or hear the
tornado. TAKE COVER NOW!

This cluster of thunderstorms is capable of producing tornadoes and
widespread significant wind damage. Do not wait to see or hear the
tornado. For your protection move to an interior room on the lowest
floor of a building.

&&

LAT...LON 4021 7712 4036 7701 4037 7664 4020 7657
      4019 7659 4019 7661 4017 7664 4017 7666
      4015 7668 4015 7670 4012 7672 4011 7672
TIME...MOT...LOC 2014Z 274DEG 37KT 4027 7697 

TORNADO...RADAR INDICATED
HAIL...1.00IN

$$

Dangelo
1 follow-up statement
260 
WWUS51 KCTP 152034
SVSCTP

Severe Weather Statement
National Weather Service State College PA
434 PM EDT TUE MAY 15 2018

PAC041-099-152042-
/O.CAN.KCTP.TO.W.0007.000000T0000Z-180515T2045Z/
Perry PA-Cumberland PA-
434 PM EDT TUE MAY 15 2018

...THE TORNADO WARNING FOR EAST CENTRAL PERRY AND NORTHEASTERN
CUMBERLAND COUNTIES IS CANCELLED...
    
The tornadic part of the thunderstorms which prompted the warning 
has moved to the east. Therefore, the warning for Perry and 
Cumberland Counties has been cancelled.

A severe thunderstorm watch remains in effect until 800 PM EDT for
south central Pennsylvania.

LAT...LON 4016 7692 4017 7691 4018 7692 4032 7662
      4020 7657 4019 7661 4017 7664 4017 7666
      4015 7668 4015 7670 4012 7672 4011 7672
TIME...MOT...LOC 2032Z 283DEG 37KT 4020 7673 

$$

PAC043-133-152045-
/O.CON.KCTP.TO.W.0007.000000T0000Z-180515T2045Z/
York PA-Dauphin PA-
434 PM EDT TUE MAY 15 2018

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 445 PM EDT FOR NORTH
CENTRAL YORK AND SOUTHEASTERN DAUPHIN COUNTIES...

At 432 PM EDT, a severe squall line capable of producing both 
tornadoes and extensive straight line wind damage was located 
near Middletown, moving east at 40 mph.

HAZARD...Tornado and quarter size hail.

SOURCE...Radar indicated rotation.

IMPACT...Flying debris will be dangerous to those caught without 
         shelter. Mobile homes will be damaged or destroyed. Damage 
         to roofs, windows, and vehicles will occur.  Tree damage is 
         likely.

This tornadic thunderstorm will remain over mainly rural areas of
north central York and southeastern Dauphin Counties, including the
following locations: Three Mile Island, Goldsboro, Newberrytown, Penn
State Harrisburg, Harrisburg International Airport, Hershey Park,
Penn State College Of Medicine, York Haven and Capital City Airport.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

Heavy rainfall may hide this tornado. Do not wait to see or hear the
tornado. TAKE COVER NOW!

This cluster of thunderstorms is capable of producing tornadoes and
widespread significant wind damage. Do not wait to see or hear the
tornado. For your protection move to an interior room on the lowest
floor of a building.

&&

LAT...LON 4016 7692 4017 7691 4018 7692 4032 7662
      4020 7657 4019 7661 4017 7664 4017 7666
      4015 7668 4015 7670 4012 7672 4011 7672
TIME...MOT...LOC 2032Z 283DEG 37KT 4020 7673 

TORNADO...RADAR INDICATED
HAIL...1.00IN

$$

Dangelo

The office that day

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

IssuedProductOfficeCountiesLasted
May 15, 3:47 AM EDTFlash Flood WatchCTPAdams, Bedford, Cumberland, Dauphin, Franklin, Fulton and 5 more15 hr
May 15, 8:16 AM EDTSpecial Weather StatementCTPTioga44 min
May 15, 11:38 AM EDTSpecial Weather StatementCTPElk, McKean52 min
May 15, 12:00 PM EDTSevere Thunderstorm WarningCTPCameron, Clearfield, Elk, McKean75 min
May 15, 12:43 PM EDTSevere Thunderstorm WarningCTPCameron, Clinton, Elk, Potter47 min
May 15, 12:46 PM EDTTornado WarningCTPCameron, Clinton, Elk, Potter44 min
May 15, 12:58 PM EDTSevere Thunderstorm WarningCTPCambria, Cameron, Clearfield, Clinton, Elk57 min
May 15, 1:03 PM EDTSpecial Weather StatementCTPTioga42 min
May 15, 1:14 PM EDTSevere Thunderstorm WarningCTPTioga61 min
May 15, 1:25 PM EDTTornado WarningCTPClinton, Lycoming, Potter, Tioga65 min
May 15, 1:34 PM EDTSpecial Weather StatementCTPCambria41 min
May 15, 1:42 PM EDTSevere Thunderstorm WarningCTPCentre, Clearfield, Clinton, Lycoming63 min
May 15, 1:59 PM EDTSpecial Weather StatementCTPBlair46 min
May 15, 2:04 PM EDTTornado WarningCTPSullivan41 min
May 15, 2:11 PM EDTSevere Thunderstorm WarningCTPBlair, Cambria, Centre, Huntingdon49 min
May 15, 2:16 PM EDTSevere Thunderstorm WarningCTPCentre, Clinton, Columbia, Huntingdon, Juniata, Lycoming and 6 more74 min
May 15, 2:34 PM EDTSevere Thunderstorm WarningCTPBlair, Huntingdon, Juniata, Mifflin, Perry56 min
May 15, 2:45 PM EDTTornado WarningCTPMontour, Northumberland, Snyder, Union24 min
May 15, 2:48 PM EDTTornado WarningCTPColumbia, Montour, Northumberland42 min
May 15, 2:51 PM EDTSpecial Weather StatementCTPHuntingdon24 min
May 15, 3:14 PM EDTSevere Thunderstorm WarningCTPColumbia, Dauphin, Juniata, Northumberland, Perry, Schuylkill and 1 more46 min
May 15, 3:23 PM EDTSpecial Weather StatementCTPFulton37 min
May 15, 3:34 PM EDTSevere Thunderstorm WarningCTPCumberland, Franklin, Perry41 min
May 15, 3:45 PM EDTSevere Thunderstorm WarningCTPCumberland, Dauphin, Franklin, Fulton, Lancaster, Lebanon and 3 more60 min
May 15, 4:31 PM EDTSevere Thunderstorm WarningCTPAdams, Cumberland, York59 min
May 15, 4:41 PM EDTSevere Thunderstorm WarningCTPDauphin, Lancaster, Lebanon, York53 min
May 15, 5:07 PM EDTSevere Thunderstorm WarningCTPAdams, Lancaster, York83 min
May 15, 6:02 PM EDTAreal Flood AdvisoryCTPLancaster, York118 min

Nearby

Tornado Warnings in Pennsylvania, 2018Every tornado warning in 2018Tornadoes in 2018

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.