Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 123, NWS State College, PA

July 11, 20218 counties in Pennsylvania

NWS State College, PA issued this severe thunderstorm warning at Jul 11, 2021, 7:58 PM EDT for 8 counties in Pennsylvania. It was in force for 62 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 11, 2021, 7:58 PM EDT (23:58 UTC)
Expired: Jul 11, 2021, 9:00 PM EDT
In force: 62 min
Issued by: NWS State College, PA
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Bedford County, PA, Cumberland County, PA, Franklin County, PA, Fulton County, PA, Huntingdon County, PA, Juniata County, PA, Mifflin County, PA, Perry County, PA

The radar

The State College radar (KCCX), 87 km from the middle of the area, began a volume at 00:02 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

Time	Report	Where	Remark
Jul 11, 8:30 PM EDT	TSTM WND DMG	1 N Newport, PA	* 1 INJ * A TREE FELL ON A VAN TRAPPING THE FAMILY OF NINE IN THE VAN ON WEST JUNIATA PARKWAY IN HOWE TOWNSHIP. THERE WAS ONE INJURY REPORTED.
Jul 11, 8:37 PM EDT	TSTM WND DMG	2 Ese Newport, PA	WIRES DOWN ALONG UPPER BAILEY ROAD IN MILLER TOWNSHIP.

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.

Issued	Product	Office	Lasted
Jul 11, 2:40 PM EDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 12.0 hours before the alert went out and 159 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 192 J/kg
Mixed-layer CIN: -42 J/kg
Mixed-layer LCL: 706 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 164 m²/s²
0-3 km storm-relative helicity: 174 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

Open this sounding in Storm Lab

The text

As transmitted.

220 
WUUS51 KCTP 112358
SVRCTP
PAC009-041-055-057-061-067-087-099-120100-
/O.NEW.KCTP.SV.W.0123.210711T2358Z-210712T0100Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service State College PA
758 PM EDT Sun Jul 11 2021

The National Weather Service in State College PA has issued a

* Severe Thunderstorm Warning for...
  Southeastern Bedford County in south central Pennsylvania...
  Southeastern Huntingdon County in central Pennsylvania...
  Franklin County in south central Pennsylvania...
  Central Mifflin County in central Pennsylvania...
  Fulton County in south central Pennsylvania...
  Juniata County in central Pennsylvania...
  Western Cumberland County in south central Pennsylvania...
  Perry County in south central Pennsylvania...

* Until 900 PM EDT.

* At 758 PM EDT, severe thunderstorms were located along a line
  extending from near Beaver Springs to near East Waterford to near
  Fort Littleton to near Crystal Springs to near Inglesmith, moving
  east at 20 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Expect damage to roofs, siding, and trees.

* Locations impacted include...
  Chambersburg, Carlisle, Shippensburg, Greencastle, Breezewood,
  Guilford, Plainfield, St. Thomas, Schlusser, Fayetteville,
  Warfordsburg, Newport, Mercersburg, Duncannon, Scotland, Newville,
  Honey Grove, New Bloomfield, McConnellsburg and Harrisonville.

This includes the following Interstates...
 Interstate 70 from mile markers 148 to 170.
 The Pennsylvania Turnpike from mile markers 162 to 226.
 Interstate 81 from mile markers 2 to 44.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Intense thunderstorm lines can produce brief tornadoes and widespread
significant wind damage. Although a tornado is not immediately
likely, it is best to move to an interior room on the lowest floor of
a building. These storms may cause serious injury and significant
property damage.

Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 3973 7856 4070 7737 4068 7716 4068 7704
      4064 7700 4065 7695 4059 7696 4057 7699
      4052 7698 4047 7695 4042 7702 4039 7703
      4036 7701 4035 7697 4015 7728 3972 7776
TIME...MOT...LOC 2358Z 264DEG 11KT 4070 7722 4037 7756 4014 7793 3994
7815 3972 7840

HAIL...<.75IN
WIND...60MPH
 
$$

Lambert

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 11, 3:29 PM EDT	Special Weather Statement	CTP	Cameron	31 min
Jul 11, 3:51 PM EDT	Special Weather Statement	CTP	Cambria	39 min
Jul 11, 4:42 PM EDT	Flash Flood Watch	CTP	Columbia, Lycoming, Sullivan, Tioga	9 hr
Jul 11, 4:48 PM EDT	Severe Thunderstorm Warning	CTP	Cameron, Elk	42 min
Jul 11, 4:51 PM EDT	Severe Thunderstorm Warning	CTP	Clearfield, Elk	39 min
Jul 11, 4:59 PM EDT	Special Weather Statement	CTP	Blair	46 min
Jul 11, 5:06 PM EDT	Special Weather Statement	CTP	Snyder	39 min
Jul 11, 5:06 PM EDT	Severe Thunderstorm Warning	CTP	Blair, Huntingdon	24 min
Jul 11, 5:10 PM EDT	Tornado Warning	CTP	Cameron, Elk	24 min
Jul 11, 5:18 PM EDT	Severe Thunderstorm Warning	CTP	Elk	46 min
Jul 11, 5:19 PM EDT	Severe Thunderstorm Warning	CTP	Cameron, Clearfield, Elk	41 min
Jul 11, 5:25 PM EDT	Severe Thunderstorm Warning	CTP	Cambria, Somerset	65 min
Jul 11, 5:30 PM EDT	Severe Thunderstorm Warning	CTP	Blair, Centre, Clearfield, Huntingdon	45 min
Jul 11, 5:37 PM EDT	Areal Flood Advisory	CTP	Cameron, Clearfield, Clinton, Elk, Potter	2 hr
Jul 11, 5:52 PM EDT	Special Weather Statement	CTP	Bedford	23 min
Jul 11, 5:55 PM EDT	Severe Thunderstorm Warning	CTP	Cameron, Centre, Clearfield, Clinton, Potter	35 min
Jul 11, 6:03 PM EDT	Severe Thunderstorm Warning	CTP	Bedford, Blair, Cambria, Centre, Clearfield, Huntingdon and 1 more	57 min
Jul 11, 6:16 PM EDT	Tornado Warning	CTP	Centre, Clinton	29 min
Jul 11, 6:23 PM EDT	Severe Thunderstorm Warning	CTP	Centre, Clinton	52 min
Jul 11, 6:35 PM EDT	Special Weather Statement	CTP	Sullivan	25 min
Jul 11, 6:39 PM EDT	Severe Thunderstorm Warning	CTP	Centre, Clinton	51 min
Jul 11, 6:48 PM EDT	Tornado Warning	CTP	Centre, Clinton	27 min
Jul 11, 6:57 PM EDT	Severe Thunderstorm Warning	CTP	Bedford, Centre, Cumberland, Franklin, Fulton, Huntingdon and 3 more	63 min
Jul 11, 7:02 PM EDT	Severe Thunderstorm Warning	CTP	Columbia, Sullivan	43 min
Jul 11, 7:25 PM EDT	Severe Thunderstorm Warning	CTP	Clinton	50 min
Jul 11, 7:31 PM EDT	Severe Thunderstorm Warning	CTP	Centre, Clinton, Juniata, Mifflin, Snyder, Union	44 min
Jul 11, 7:39 PM EDT	Tornado Warning	CTP	Clinton, Lycoming	36 min
Jul 11, 7:48 PM EDT	Special Weather Statement	CTP	Sullivan	27 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2021 Every 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.