Alert archive / Pennsylvania / Tornado Warnings in 2018

Tornado Warning 6, NWS State College, PA

May 15, 2018Columbia County, Montour County, Northumberland County, Pennsylvania

NWS State College, PA issued this tornado warning at May 15, 2018, 2:48 PM EDT for Columbia County, Montour County, Northumberland County, Pennsylvania. It was in force for 42 min. 5 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, 2:48 PM EDT (18:48 UTC)
Expired
May 15, 2018, 3:30 PM EDT
In force
42 min
Issued by
NWS State College, PA
Area
Storm-based polygon
Tornado
Radar indicated
Hail
1.0 in

Counties Columbia County, PA, Montour County, PA, Northumberland County, PA

The radar

The State College radar (KCCX), 128 km from the middle of the area, began a volume at 18:51 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, 3:00 PM EDTTSTM WND DMGPealertown, PANUMEROUS TREES DOWN. WIND GUST ESTIMATED AT 85 MPH.
May 15, 3:04 PM EDTTSTM WND DMG1 W Willow Springs, PANUMEROUS TREES DOWN. WIND GUST ESTIMATED AT 85 MPH.
May 15, 3:08 PM EDTTSTM WND DMGBerwick, PAROOF OFF OF HOME.
May 15, 3:09 PM EDTTSTM WND DMG1 W Lime Ridge, PACENTRAL COLUMBIA HIGH SCHOOL CONCESSION BUILDING TOPPLED
May 15, 3:09 PM EDTTSTM WND GST 581 W Lime Ridge, PAWIND GUST MEASURED AT CENTRAL COLUMBIA HIGH SCHOOL

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, 6.8 hours before the alert went out and 252 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.

064 
WFUS51 KCTP 151848
TORCTP
PAC037-093-097-151930-
/O.NEW.KCTP.TO.W.0006.180515T1848Z-180515T1930Z/

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

The National Weather Service in State College PA has issued a

* Tornado Warning for...
  North central Northumberland County in central Pennsylvania...
  Montour County in central Pennsylvania...
  Central Columbia County in central Pennsylvania...

* Until 330 PM EDT
    
* At 247 PM EDT, a severe thunderstorm capable of producing a tornado
  was located over Exchange, moving east at 65 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 dangerous storm will be near...
  Jerseytown, Iola and Eyers Grove around 250 PM EDT.
  Rohrsburg, Lightstreet and Almedia around 300 PM EDT.

Other locations impacted by this tornadic thunderstorm include Briar
Creek, Turbotville, Lime Ridge, Washingtonville, Orangeville, Benton,
Stillwater, Millville and McEwensville.

For those driving on Interstate 80, this includes areas between the
Limestoneville and Mifflinville exits, specifically between mile
markers 215 and 218...near mile marker 229...and from mile markers
231 to 241.

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!

&&

LAT...LON 4103 7623 4099 7676 4101 7680 4108 7682
      4113 7675 4116 7664 4116 7659 4117 7657
      4123 7632 4120 7632 4114 7628 4113 7623
TIME...MOT...LOC 1847Z 258DEG 57KT 4109 7665 

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

$$

Lambert
1 follow-up statement
535 
WWUS51 KCTP 151911
SVSCTP

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

PAC093-097-151921-
/O.CAN.KCTP.TO.W.0006.000000T0000Z-180515T1930Z/
Northumberland PA-Montour PA-
311 PM EDT TUE MAY 15 2018

...THE TORNADO WARNING FOR NORTH CENTRAL NORTHUMBERLAND AND MONTOUR
COUNTIES IS CANCELLED...
    
The tornadic thunderstorm which prompted the warning has moved out 
of the warned area. Therefore, the warning has been cancelled.

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

LAT...LON 4101 7651 4109 7646 4120 7645 4123 7632
      4120 7632 4114 7628 4113 7623 4103 7623
TIME...MOT...LOC 1911Z 261DEG 41KT 4105 7630 

$$

PAC037-151930-
/O.CON.KCTP.TO.W.0006.000000T0000Z-180515T1930Z/
Columbia PA-
311 PM EDT TUE MAY 15 2018

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 330 PM EDT FOR
NORTHEASTERN COLUMBIA COUNTY...
    
At 311 PM EDT, a severe thunderstorm capable of producing a tornado
was located over Mifflinville, moving east at 45 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
northeastern Columbia County, including the following locations:
Briar Creek, Benton, Stillwater, Lime Ridge and Orangeville.

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!

&&

LAT...LON 4101 7651 4109 7646 4120 7645 4123 7632
      4120 7632 4114 7628 4113 7623 4103 7623
TIME...MOT...LOC 1911Z 261DEG 41KT 4105 7630 

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

$$

Lambert

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, 2:51 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, 4:14 PM EDTTornado WarningCTPCumberland, Dauphin, Perry, York31 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.