Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 122, NWS State College, PA

July 11, 20216 counties in Pennsylvania

NWS State College, PA issued this severe thunderstorm warning at Jul 11, 2021, 7:31 PM EDT for 6 counties in Pennsylvania. It was in force for 44 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: Jul 11, 2021, 7:31 PM EDT (23:31 UTC)
Expired: Jul 11, 2021, 8:15 PM EDT
In force: 44 min
Issued by: NWS State College, PA
Area: Storm-based polygon
Tornado: Possible
Hail: 0.75 in
Wind: 70.0 mph

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

The radar

The State College radar (KCCX), 55 km from the middle of the area, began a volume at 23:35 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, 7:32 PM EDT	TSTM WND DMG	Poe Valley State Park, PA	TREES DOWN, SOME ON VEHICLES. SIX CAMPSITES DAMAGED. NO INJURIES.
Jul 11, 7:35 PM EDT	TSTM WND DMG	Reeds Gap State Park, PA	TREES AND WIRES DOWN.
Jul 11, 7:38 PM EDT	TSTM WND DMG	1 Sse Mcelhattan, PA	SEVERAL REPORTS OF TREES AND WIRES DOWN BETWEEN LOCK HAVEN AND AVIS.
Jul 11, 7:38 PM EDT	TSTM WND DMG	2 Ese Millheim, PA	TREES DOWN NEAR THE INTERSECTION OF BROAD ROAD AND PINE CREEK ROAD EAST OF COBURN.
Jul 11, 7:59 PM EDT	TSTM WND DMG	Avis, PA	MULTIPLE REPORTS OF TREES DOWN IN AND AROUND AVIS.

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, 11.5 hours before the alert went out and 191 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.

045 
WUUS51 KCTP 112331
SVRCTP
PAC027-035-067-087-109-119-120015-
/O.NEW.KCTP.SV.W.0122.210711T2331Z-210712T0015Z/

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

The National Weather Service in State College PA has issued a

* Severe Thunderstorm Warning for...
  Central Mifflin County in central Pennsylvania...
  Southeastern Centre County in central Pennsylvania...
  Juniata County in central Pennsylvania...
  Western Snyder County in central Pennsylvania...
  Southwestern Union County in central Pennsylvania...
  Southeastern Clinton County in north central Pennsylvania...

* Until 815 PM EDT.

* At 731 PM EDT, severe thunderstorms were located along a line
  extending from near Zion to near Coburn to Alfarata to near Juniata
  Terrace to near Allensville to near Blacklog, moving northeast at
  35 mph.

  HAZARD...70 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Expect considerable tree damage. Damage is likely to 
           mobile homes, roofs, and outbuildings.

* Severe thunderstorms will be near...
  Belltown, Millheim, Aaronsburg, Coburn, Lamar, Madisonburg, 
  Rebersburg, Reeds Gap State Park, Poe Valley State Park and Bald 
  Eagle State Park around 740 PM EDT.
  Woodward, Mackeyville, McClure, Weikert and Mill Hall around 750 
  PM EDT.
  Mcalisterville, Beaver Springs, Troxelville, Alfarata, Laurelton 
  Center, Snyder-Middleswart State Park, Castanea, Flemington and 
  Dunnstown around 800 PM EDT.
  Mifflinburg, Mexico, R.B. Winter State Park, Sand Bridge State 
  Park, Paxtonville, Richfield, Middleburg, Forest Hill, Carroll and 
  Penns Creek around 810 PM EDT.

Other locations impacted by these severe thunderstorms include
Beavertown, Port Royal, Wagner, Thompsontown, McCall Dam State Park,
Atkinson Mills, East Salem, Mifflin, Mifflintown and Siglerville.

For those driving on Interstate 80, this includes areas between the
Milesburg and Mile Run exits, specifically from mile markers 158 to
196.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4038 7775 4036 7782 4048 7781 4051 7762
      4064 7755 4083 7757 4097 7779 4120 7730
      4107 7716 4101 7705 4090 7706 4081 7703
      4074 7706 4069 7713 4056 7717 4043 7749
      4039 7754 4034 7773
TIME...MOT...LOC 2331Z 244DEG 29KT 4095 7765 4086 7751 4067 7748 4054
7755 4051 7774 4041 7775

TORNADO...POSSIBLE
HAIL...<.75IN
WIND...70MPH
 
$$

Jurewicz

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, 7:39 PM EDT	Tornado Warning	CTP	Clinton, Lycoming	36 min
Jul 11, 7:48 PM EDT	Special Weather Statement	CTP	Sullivan	27 min
Jul 11, 7:58 PM EDT	Severe Thunderstorm Warning	CTP	Bedford, Cumberland, Franklin, Fulton, Huntingdon, Juniata and 2 more	62 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.