Alert archive / Pennsylvania / Tornado Warnings in 2021

Tornado Warning 7, NWS State College, PA

July 13, 2021Lycoming County, Montour County, Northumberland County, Pennsylvania

NWS State College, PA issued this tornado warning at Jul 13, 2021, 8:51 PM EDT for Lycoming County, Montour County, Northumberland County, Pennsylvania. It was in force for 24 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
Jul 13, 2021, 8:51 PM EDT (00:51 UTC)
Expired
Jul 13, 2021, 9:15 PM EDT
In force
24 min
Issued by
NWS State College, PA
Area
Storm-based polygon
Tornado
Radar indicated
Hail
0.75 in

Counties Lycoming County, PA, Montour County, PA, Northumberland County, PA

The radar

The State College radar (KCCX), 111 km from the middle of the area, began a volume at 00:51 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
Jul 13, 8:55 PM EDTHAIL 1.5Montgomery, 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
Jul 13, 1:37 PM EDTSevere Thunderstorm WatchSPC10 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 00:00Z, 0.9 hours before the alert went out and 251 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 00:00Z on 2021-07-14Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1133 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 00:00Z on 2021-07-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 77 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
1133 J/kg
Mixed-layer CIN
-111 J/kg
Mixed-layer LCL
1722 m above ground
0-6 km bulk shear
23 kt
0-1 km storm-relative helicity
77 m²/s²
0-3 km storm-relative helicity
77 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.0

Open this sounding in Storm Lab

The text

As transmitted.

687 
WFUS51 KCTP 140051
TORCTP
PAC081-093-097-140115-
/O.NEW.KCTP.TO.W.0007.210714T0051Z-210714T0115Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service State College PA
851 PM EDT Tue Jul 13 2021

The National Weather Service in State College PA has issued a

* Tornado Warning for...
  Northwestern Northumberland County in central Pennsylvania...
  Northwestern Montour County in central Pennsylvania...
  Southeastern Lycoming County in north central Pennsylvania...

* Until 915 PM EDT.
    
* At 850 PM EDT, a severe thunderstorm capable of producing a tornado
  was located over Delaware Run, moving east at 25 mph.

  HAZARD...Tornado.

  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...
  Muncy around 900 PM EDT.
  Exchange around 910 PM EDT.

Other locations impacted by this tornadic thunderstorm include
Turbotville.

This includes Interstate 180 from mile markers 3 to 12.

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.

&&

LAT...LON 4108 7662 4109 7688 4115 7690 4116 7691
      4124 7666 4116 7662 4115 7663 4116 7664
      4115 7664
TIME...MOT...LOC 0050Z 252DEG 22KT 4113 7684 

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

Travis
1 follow-up statement
609 
WWUS51 KCTP 140111
SVSCTP

Severe Weather Statement
National Weather Service State College PA
911 PM EDT Tue Jul 13 2021

PAC081-093-097-140120-
/O.EXP.KCTP.TO.W.0007.000000T0000Z-210714T0115Z/
Northumberland PA-Montour PA-Lycoming PA-
911 PM EDT Tue Jul 13 2021

...THE TORNADO WARNING FOR NORTHWESTERN NORTHUMBERLAND...NORTHWESTERN
MONTOUR AND SOUTHEASTERN LYCOMING COUNTIES WILL EXPIRE AT 915 PM
EDT...
                
The storm which prompted the warning no longer appears capable of 
producing a tornado. Therefore, the warning will be allowed to 
expire.  However gusty winds and hail are still possible with this 
thunderstorm.

A Severe Thunderstorm Watch remains in effect until 1100 PM EDT for
central and north central Pennsylvania.

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
State College PA.

LAT...LON 4108 7662 4109 7688 4115 7690 4116 7691
      4124 7666 4116 7662 4115 7663 4116 7664
      4115 7664
TIME...MOT...LOC 0110Z 252DEG 22KT 4116 7670 

$$

Travis

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 13, 8:08 PM EDTSpecial Weather StatementCTPFranklin37 min
Jul 13, 8:09 PM EDTSpecial Weather StatementCTPLycoming36 min
Jul 13, 8:17 PM EDTSevere Thunderstorm WarningCTPLycoming, Northumberland, Union43 min
Jul 13, 8:25 PM EDTSpecial Weather StatementCTPHuntingdon35 min
Jul 13, 8:41 PM EDTAreal Flood AdvisoryCTPLycoming, Sullivan, Tioga25 min
Jul 13, 8:59 PM EDTSevere Thunderstorm WarningCTPLycoming, Sullivan61 min
Jul 13, 9:06 PM EDTFlash Flood WarningCTPLycoming, Sullivan, Tioga3 hr
Jul 13, 9:15 PM EDTSpecial Weather StatementCTPLycoming30 min
Jul 13, 9:30 PM EDTSevere Thunderstorm WarningCTPClinton, Lycoming, Northumberland, Snyder, Union60 min
Jul 13, 10:18 PM EDTAreal Flood AdvisoryCTPCentre, Clinton, Columbia, Lycoming, Montour, Northumberland and 2 more117 min
Jul 13, 10:18 PM EDTSevere Thunderstorm WarningCTPColumbia, Montour, Northumberland, Snyder, Union57 min
Jul 13, 11:18 PM EDTSpecial Weather StatementCTPColumbia, Montour27 min
Jul 14, 12:12 AM EDTAreal Flood AdvisoryCTPColumbia, Montour, Northumberland2 hr
Jul 14, 1:46 AM EDTAreal Flood AdvisoryCTPLycoming119 min
Jul 14, 1:49 PM EDTSpecial Weather StatementCTPPerry26 min
Jul 14, 4:08 PM EDTSpecial Weather StatementCTPPerry37 min
Jul 14, 4:58 PM EDTSpecial Weather StatementCTPSullivan32 min
Jul 14, 6:52 PM EDTSpecial Weather StatementCTPLycoming23 min
Jul 14, 7:31 PM EDTSpecial Weather StatementCTPColumbia29 min

Nearby

Tornado Warnings in Pennsylvania, 2021Every tornado warning in 2021Tornadoes in 2021

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.