Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 154, NWS State College, PA

July 13, 20215 counties in Pennsylvania

NWS State College, PA issued this severe thunderstorm warning at Jul 13, 2021, 7:59 PM EDT for 5 counties in Pennsylvania. It was in force for 46 min. 2 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
Jul 13, 2021, 7:59 PM EDT (23:59 UTC)
Expired
Jul 13, 2021, 8:45 PM EDT
In force
46 min
Issued by
NWS State College, PA
Area
Storm-based polygon
Hail
1.0 in
Wind
80.0 mph

Counties Centre County, PA, Clinton County, PA, Mifflin County, PA, Snyder County, PA, Union County, PA

The radar

The State College radar (KCCX), 38 km from the middle of the area, began a volume at 00:04 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, 8:18 PM EDTTSTM WND DMG1 Wsw Reedsville, PACORRECTS PREVIOUS NON-TSTM WND DMG REPORT FROM 1 WSW REEDSVILLE. TREE ON WIRES ON ROUTE 414.
Jul 13, 8:18 PM EDTNON-TSTM WND DMG1 Wsw Reedsville, PATREE ON WIRES ON ROUTE 414.

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 12:00Z, 12.0 hours before the alert went out and 219 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 2021-07-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 842 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 2021-07-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -28 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
842 J/kg
Mixed-layer CIN
-126 J/kg
Mixed-layer LCL
1101 m above ground
0-6 km bulk shear
27 kt
0-1 km storm-relative helicity
-28 m²/s²
0-3 km storm-relative helicity
32 m²/s²
Significant tornado parameter
-0.0
Supercell composite
-0.2

Open this sounding in Storm Lab

The text

As transmitted.

070 
WUUS51 KCTP 132359
SVRCTP
PAC027-035-087-109-119-140045-
/O.NEW.KCTP.SV.W.0154.210713T2359Z-210714T0045Z/

BULLETIN - EAS ACTIVATION REQUESTED
Severe Thunderstorm Warning
National Weather Service State College PA
759 PM EDT Tue Jul 13 2021

The National Weather Service in State College PA has issued a

* Severe Thunderstorm Warning for...
  Mifflin County in central Pennsylvania...
  Eastern Centre County in central Pennsylvania...
  Northwestern Snyder County in central Pennsylvania...
  Southwestern Union County in central Pennsylvania...
  Southeastern Clinton County in north central Pennsylvania...

* Until 845 PM EDT.

* At 759 PM EDT, severe thunderstorms were located along a line
  extending from Monument to near Zion to Potters Mills to near Seven
  Mountains to Belleville, moving northeast at 45 mph.

  These are very dangerous storms.

  HAZARD...80 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Flying debris will be dangerous to those caught without 
           shelter. Mobile homes will be heavily damaged. Expect 
           considerable damage to roofs, windows, and vehicles. 
           Extensive tree damage and power outages are likely.

* Severe thunderstorms will be near...
  Monument, Potters Mills, Zion and Bald Eagle State Park around 800 
  PM EDT.
  Lewistown, Lamar, Spring Mills, Highland Park, Burnham, 
  Madisonburg, Blanchard, Juniata Terrace and Glen Union around 810 
  PM EDT.
  Lock Haven, Poe Valley State Park, Reeds Gap State Park, 
  Rebersburg, Aaronsburg, Mackeyville, Coburn, Mill Hall, Millheim 
  and Castanea around 820 PM EDT.
  Woodward, Avis, McElhattan, Dunnstown and McClure around 830 PM 
  EDT.

Other locations impacted by these severe thunderstorms include
Siglerville, Howard, Maitland, Wagner, Hartleton, Barrville,
Loganton, Orviston, McCall Dam State Park and Beech Creek.

For those driving on Interstate 80, this includes areas between the
Milesburg and Mile Run exits, specifically from mile markers 159 to
194.

This includes Interstate 99 from mile markers 82 to 85.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4134 7748 4129 7745 4122 7735 4121 7731
      4107 7716 4099 7712 4080 7710 4047 7782
      4061 7779 4068 7768 4069 7771 4072 7768
      4073 7768 4072 7771 4073 7775 4076 7773
      4090 7774 4114 7779
TIME...MOT...LOC 2359Z 234DEG 39KT 4112 7771 4095 7767 4080 7766 4070
7771 4059 7773

HAIL...1.00IN
WIND...80MPH
 
$$

Jurewicz

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 12, 8:26 PM EDTAreal Flood AdvisoryCTPTioga2 hr
Jul 12, 8:50 PM EDTAreal Flood AdvisoryCTPLycoming, Sullivan2 hr
Jul 12, 9:47 PM EDTAreal Flood AdvisoryCTPSullivan118 min
Jul 12, 11:21 PM EDTSpecial Weather StatementCTPYork24 min
Jul 12, 11:52 PM EDTSpecial Weather StatementCTPAdams, Lancaster, Lebanon, York23 min
Jul 13, 12:53 AM EDTSpecial Weather StatementCTPLebanon22 min
Jul 13, 1:31 AM EDTSpecial Weather StatementCTPSchuylkill29 min
Jul 13, 2:02 AM EDTSpecial Weather StatementCTPSchuylkill28 min
Jul 13, 12:39 PM EDTFlash Flood WatchCTPColumbia, Lycoming, Montour, Northumberland, Snyder, Sullivan and 2 more11 hr
Jul 13, 4:18 PM EDTSpecial Weather StatementCTPSomerset42 min
Jul 13, 4:31 PM EDTAreal Flood AdvisoryCTPTioga119 min
Jul 13, 4:34 PM EDTSevere Thunderstorm WarningCTPSomerset41 min
Jul 13, 4:35 PM EDTSevere Thunderstorm WarningCTPWarren55 min
Jul 13, 4:38 PM EDTAreal Flood AdvisoryCTPSomerset3 hr
Jul 13, 5:14 PM EDTSpecial Weather StatementCTPSomerset46 min
Jul 13, 5:23 PM EDTSevere Thunderstorm WarningCTPElk, McKean, Warren52 min
Jul 13, 5:35 PM EDTSpecial Weather StatementCTPClearfield40 min
Jul 13, 5:38 PM EDTSevere Thunderstorm WarningCTPBedford, Somerset41 min
Jul 13, 5:49 PM EDTSevere Thunderstorm WarningCTPCameron, Centre, Clearfield, Clinton, Potter56 min
Jul 13, 5:53 PM EDTSevere Thunderstorm WarningCTPCameron, Clearfield, Elk67 min
Jul 13, 5:56 PM EDTSpecial Weather StatementCTPClearfield34 min
Jul 13, 6:01 PM EDTSevere Thunderstorm WarningCTPBedford, Blair, Cambria, Clearfield59 min
Jul 13, 6:07 PM EDTSevere Thunderstorm WarningCTPClearfield, Elk38 min
Jul 13, 6:19 PM EDTSevere Thunderstorm WarningCTPMcKean, Potter41 min
Jul 13, 6:27 PM EDTSevere Thunderstorm WarningCTPSomerset37 min
Jul 13, 6:33 PM EDTSpecial Weather StatementCTPClearfield27 min
Jul 13, 6:35 PM EDTSpecial Weather StatementCTPHuntingdon40 min
Jul 13, 6:43 PM EDTSevere Thunderstorm WarningCTPClinton, Potter, Tioga47 min
Jul 13, 6:46 PM EDTSevere Thunderstorm WarningCTPBlair, Centre, Clearfield44 min
Jul 13, 6:46 PM EDTSevere Thunderstorm WarningCTPBlair, Huntingdon44 min
Jul 13, 6:54 PM EDTAreal Flood AdvisoryCTPCameron, Clearfield, Clinton3 hr
Jul 13, 6:59 PM EDTSevere Thunderstorm WarningCTPPotter61 min
Jul 13, 7:01 PM EDTSevere Thunderstorm WarningCTPCentre, Clinton44 min
Jul 13, 7:07 PM EDTSpecial Weather StatementCTPClinton23 min
Jul 13, 7:08 PM EDTSpecial Weather StatementCTPSomerset37 min
Jul 13, 7:16 PM EDTSevere Thunderstorm WarningCTPCentre, Huntingdon, Mifflin44 min
Jul 13, 7:26 PM EDTSevere Thunderstorm WarningCTPLycoming, Tioga64 min
Jul 13, 7:29 PM EDTAreal Flood AdvisoryCTPCentre, Clinton3 hr
Jul 13, 7:44 PM EDTSevere Thunderstorm WarningCTPClinton, Lycoming, Tioga61 min
Jul 13, 7:55 PM EDTFlash Flood WarningCTPLycoming, Tioga2 hr
Jul 13, 7:58 PM EDTAreal Flood AdvisoryCTPCentre, Clinton2 hr

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2021Every severe thunderstorm warning 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.