Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 119, NWS State College, PA

July 11, 20219 counties in Pennsylvania

NWS State College, PA issued this severe thunderstorm warning at Jul 11, 2021, 6:57 PM EDT for 9 counties in Pennsylvania. It was in force for 63 min. 6 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, 6:57 PM EDT (22:57 UTC)
Expired: Jul 11, 2021, 8:00 PM EDT
In force: 63 min
Issued by: NWS State College, PA
Area: Storm-based polygon
Hail: 0.75 in
Wind: 70.0 mph

Counties Bedford County, PA, Centre 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), 48 km from the middle of the area, began a volume at 23:02 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, 6:57 PM EDT	TSTM WND DMG	1 Wsw Pine Grove Mills, PA	TREE DOWN ACROSS ROAD NEAR THE INTERSECTION OF SOUTH NIXON ROAD AND PINE GROVE ROAD IN FERGUSON TOWNSHIP.
Jul 11, 7:02 PM EDT	TSTM WND DMG	1 Wnw State College, PA	TREE DOWN ON WIRES IN THE 400 BLOCK OF RIDGE AVENUE.
Jul 11, 7:15 PM EDT	TSTM WND DMG	2 Ne Belleville, PA	TREE ON WIRES IN THE 500 BLOCK OF MAPLE GROVE ROAD, CLOSING THE ROAD.
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	2 Ese Millheim, PA	TREES DOWN NEAR THE INTERSECTION OF BROAD ROAD AND PINE CREEK ROAD EAST OF COBURN.

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, 11.0 hours before the alert went out and 179 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.

843 
WUUS51 KCTP 112257
SVRCTP
PAC009-027-041-055-057-061-067-087-099-120000-
/O.NEW.KCTP.SV.W.0119.210711T2257Z-210712T0000Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service State College PA
657 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...
  Huntingdon County in central Pennsylvania...
  Central Franklin County in south central Pennsylvania...
  Mifflin County in central Pennsylvania...
  Southern Centre County in central Pennsylvania...
  Fulton County in south central Pennsylvania...
  Juniata County in central Pennsylvania...
  Northwestern Cumberland County in south central Pennsylvania...
  Southwestern Perry County in south central Pennsylvania...

* Until 800 PM EDT.

* At 655 PM EDT, severe thunderstorms were located along a line
  extending from near Julian to near Huntingdon to near Trough Creek
  State Park to near Everett to near Lake Gordon, moving east at 40
  mph.

  HAZARD...70 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  State College, Lewistown, Huntingdon, Bellefonte, Bedford,
  Breezewood, Park Forest Village, St. Thomas, Woodward, Boalsburg,
  Pleasant Gap, Warfordsburg, Lamar, Mount Union, Stormstown, Lemont,
  Clearville, Burnham, Zion and Everett.

For those driving on Interstate 80, this includes areas between the
Snow Shoe and Lamar exits, specifically from mile markers 157 to 170.

This includes the following Interstates...
 Interstate 70 from mile markers 147 to 170.
 The Pennsylvania Turnpike from mile markers 148 to 210.
 Interstate 99 from mile markers 57 to 85.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

This is an EXTREMELY DANGEROUS SITUATION. These storms have produced 
widespread wind damage across the I-99 corridor and points west. 
SEEK SHELTER NOW inside a sturdy structure and stay away from 
windows!

If on or near Raystown Lake, get away from the water and move 
indoors or inside a vehicle. Remember, lightning can strike out to 
15 miles from the parent thunderstorm. If you can hear thunder, you 
are close enough to be struck by lightning. Move to safe shelter 
now!  Do not be caught on the water in a thunderstorm.

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

&&

LAT...LON 3973 7879 4025 7828 4048 7810 4087 7812
      4103 7756 4097 7752 4097 7749 4099 7735
      4104 7715 4085 7736 4070 7735 4063 7728
      4042 7729 4021 7743 3973 7797
TIME...MOT...LOC 2255Z 255DEG 33KT 4084 7799 4052 7792 4028 7811 4004
7832 3973 7865

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

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, 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
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.