Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 91, NWS State College, PA

July 7, 20215 counties in Pennsylvania

NWS State College, PA issued this severe thunderstorm warning at Jul 7, 2021, 6:56 PM EDT for 5 counties in Pennsylvania. It was in force for 49 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 7, 2021, 6:56 PM EDT (22:56 UTC)
Expired
Jul 7, 2021, 7:45 PM EDT
In force
49 min
Issued by
NWS State College, PA
Area
Storm-based polygon
Hail
1.0 in
Wind
70.0 mph

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

The radar

The State College radar (KCCX), 43 km from the middle of the area, began a volume at 22:58 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 7, 7:37 PM EDTTSTM WND DMG2 W Renovo, PATREES AND WIRES DOWN.
Jul 7, 7:39 PM EDTTSTM WND DMG6 Nne Glen Union, PATREES DOWN ON WIRES.

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 7, 3:31 PM EDTSevere Thunderstorm WatchSPC7 hr

The nearest sounding before it

Buffalo Intl Airport, NY (KBUF), launched 12:00Z, 10.9 hours before the alert went out and 217 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, Buffalo Intl Airport, NY at 12:00Z on 2021-07-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 161 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, Buffalo Intl Airport, NY at 12:00Z on 2021-07-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 81 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
161 J/kg
Mixed-layer CIN
-85 J/kg
Mixed-layer LCL
734 m above ground
0-6 km bulk shear
36 kt
0-1 km storm-relative helicity
81 m²/s²
0-3 km storm-relative helicity
117 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.3

Open this sounding in Storm Lab

The text

As transmitted.

135 
WUUS51 KCTP 072256
SVRCTP
PAC027-035-087-109-119-072345-
/O.NEW.KCTP.SV.W.0091.210707T2256Z-210707T2345Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service State College PA
656 PM EDT Wed Jul 7 2021

The National Weather Service in State College PA has issued a

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

* Until 745 PM EDT.

* At 656 PM EDT, severe thunderstorms were located along a line
  extending from near Karthaus to 6 miles northeast of Clarence to
  near Bald Eagle State Park to near Madisonburg to near Poe Valley
  State Park, moving northeast at 30 mph.

  HAZARD...70 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect considerable 
           tree damage. Wind damage is also likely to mobile homes, 
           roofs, and outbuildings.

* Severe thunderstorms will be near...
  Madisonburg, Bald Eagle State Park, Spring Mills, Monument, Reeds 
  Gap State Park, Potters Mills and Belltown around 700 PM EDT.
  Rebersburg, Blanchard, Poe Valley State Park, Coburn, Aaronsburg, 
  Millheim and Lamar around 710 PM EDT.
  Lock Haven, Weikert, Mill Hall, Woodward, Keating, Flemington, 
  Snyder-Middleswart State Park and Mackeyville around 720 PM EDT.
  Dunnstown, Laurelton Center, Glen Union, Westport, Castanea and 
  Troxelville around 730 PM EDT.

Other locations impacted by these severe thunderstorms include
Siglerville, Howard, Hartleton, Loganton, Orviston, McCall Dam State
Park, Beech Creek and Lock Haven University.

For those driving on Interstate 80, this includes areas between the
Snow Shoe and Mile Run exits, specifically near mile marker 155...and
from mile markers 158 to 194.

This includes Interstate 99 near mile marker 85.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4142 7757 4137 7754 4134 7748 4131 7747
      4124 7738 4121 7730 4107 7716 4097 7710
      4079 7707 4067 7760 4086 7765 4098 7780
      4112 7807 4115 7804 4121 7809 4125 7807
      4148 7776
TIME...MOT...LOC 2256Z 241DEG 28KT 4120 7814 4113 7789 4102 7772 4091
7757 4078 7754

HAIL...1.00IN
WIND...70MPH
 
$$

Jurewicz

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 7, 3:35 PM EDTSpecial Weather StatementCTPFulton40 min
Jul 7, 4:00 PM EDTSpecial Weather StatementCTPWarren45 min
Jul 7, 4:05 PM EDTSpecial Weather StatementCTPSomerset25 min
Jul 7, 4:12 PM EDTSpecial Weather StatementCTPSomerset33 min
Jul 7, 4:12 PM EDTSevere Thunderstorm WarningCTPCambria, Somerset47 min
Jul 7, 4:22 PM EDTSevere Thunderstorm WarningCTPBedford, Somerset38 min
Jul 7, 4:44 PM EDTSevere Thunderstorm WarningCTPCambria61 min
Jul 7, 4:46 PM EDTSpecial Weather StatementCTPWarren29 min
Jul 7, 4:48 PM EDTSpecial Weather StatementCTPBedford27 min
Jul 7, 4:54 PM EDTSevere Thunderstorm WarningCTPBedford, Somerset51 min
Jul 7, 4:59 PM EDTSpecial Weather StatementCTPWarren31 min
Jul 7, 5:07 PM EDTSevere Thunderstorm WarningCTPMcKean, Warren53 min
Jul 7, 5:12 PM EDTSpecial Weather StatementCTPBlair33 min
Jul 7, 5:19 PM EDTSevere Thunderstorm WarningCTPBlair41 min
Jul 7, 5:23 PM EDTSevere Thunderstorm WarningCTPBedford37 min
Jul 7, 5:27 PM EDTSpecial Weather StatementCTPClearfield33 min
Jul 7, 5:35 PM EDTSevere Thunderstorm WarningCTPBlair25 min
Jul 7, 5:38 PM EDTSpecial Weather StatementCTPWarren37 min
Jul 7, 5:42 PM EDTSpecial Weather StatementCTPCumberland33 min
Jul 7, 5:48 PM EDTSevere Thunderstorm WarningCTPBlair, Huntingdon57 min
Jul 7, 5:50 PM EDTSevere Thunderstorm WarningCTPCumberland, Franklin40 min
Jul 7, 5:55 PM EDTSevere Thunderstorm WarningCTPMcKean65 min
Jul 7, 6:00 PM EDTSpecial Weather StatementCTPElk30 min
Jul 7, 6:12 PM EDTSevere Thunderstorm WarningCTPCentre, Clearfield, Huntingdon48 min
Jul 7, 6:22 PM EDTSpecial Weather StatementCTPMifflin23 min
Jul 7, 6:29 PM EDTSevere Thunderstorm WarningCTPWarren61 min
Jul 7, 6:36 PM EDTSevere Thunderstorm WarningCTPCentre, Clearfield, Clinton, Mifflin39 min
Jul 7, 6:37 PM EDTSevere Thunderstorm WarningCTPCumberland, Franklin, Perry37 min
Jul 7, 6:43 PM EDTSevere Thunderstorm WarningCTPMcKean, Potter77 min
Jul 7, 7:09 PM EDTSevere Thunderstorm WarningCTPJuniata, Mifflin, Snyder36 min
Jul 7, 7:19 PM EDTAreal Flood AdvisoryCTPWarren116 min
Jul 7, 7:31 PM EDTSevere Thunderstorm WarningCTPClinton, Lycoming, Montour, Northumberland, Union44 min
Jul 7, 7:44 PM EDTAreal Flood AdvisoryCTPMcKean, Potter2 hr
Jul 7, 7:48 PM EDTSpecial Weather StatementCTPBedford27 min
Jul 7, 7:50 PM EDTSpecial Weather StatementCTPTioga10 min
Jul 7, 7:51 PM EDTSpecial Weather StatementCTPPotter24 min

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.