Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 116, NWS State College, PA

July 11, 20217 counties in Pennsylvania

NWS State College, PA issued this severe thunderstorm warning at Jul 11, 2021, 6:03 PM EDT for 7 counties in Pennsylvania. It was in force for 57 min. 7 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, 6:03 PM EDT (22:03 UTC)
Expired: Jul 11, 2021, 7:00 PM EDT
In force: 57 min
Issued by: NWS State College, PA
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Bedford County, PA, Blair County, PA, Cambria County, PA, Centre County, PA, Clearfield County, PA, Huntingdon County, PA, Somerset County, PA

The radar

The State College radar (KCCX), 83 km from the middle of the area, began a volume at 22:06 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, 6:13 PM EDT	TSTM WND DMG	Altoona, PA	ROOF DAMAGE TO A BUILDING IN THE 1800 BLOCK OF UNION AVE.
Jul 11, 6:20 PM EDT	TSTM WND DMG	3 Wsw Osterburg, PA	SPORADIC REPORTS OF TREES DOWN ACROSS NORTHERN BEDFORD COUNTY.
Jul 11, 6:27 PM EDT	TSTM WND DMG	Tyrone, PA	TREES AND WIRES DOWN.
Jul 11, 6:38 PM EDT	TSTM WND DMG	Bald Eagle, PA	TREES AND WIRES DOWN.
Jul 11, 6:52 PM EDT	TSTM WND DMG	2 Ne Shy Beaver, PA	MULTIPLE REPORTS OF TREES DOWN IN LINCOLN TOWNSHIP NEAR THE LAKE RAYSTOWN RESORT.
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.

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

Pittsburgh, PA (KPIT), launched 12:00Z, 10.1 hours before the alert went out and 149 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: 5 J/kg
Mixed-layer CIN: -180 J/kg
Mixed-layer LCL: 979 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 90 m²/s²
0-3 km storm-relative helicity: 135 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

705 
WUUS51 KCTP 112203
SVRCTP
PAC009-013-021-027-033-061-111-112300-
/O.NEW.KCTP.SV.W.0116.210711T2203Z-210711T2300Z/

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

The National Weather Service in State College PA has issued a

* Severe Thunderstorm Warning for...
  Bedford County in south central Pennsylvania...
  South central Clearfield County in central Pennsylvania...
  Western Huntingdon County in central Pennsylvania...
  Southwestern Centre County in central Pennsylvania...
  Southeastern Somerset County in south central Pennsylvania...
  Blair County in central Pennsylvania...
  Eastern Cambria County in central Pennsylvania...

* Until 700 PM EDT.

* At 602 PM EDT, severe thunderstorms were located along a line
  extending from near Blandburg to near Ski Gap to near Central City
  to near Meyersdale, moving east at 30 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Altoona, State College, Huntingdon, Hollidaysburg, Tyrone, Bedford,
  Breezewood, Park Forest Village, Roaring Spring, Stormstown,
  Clearville, Bald Eagle, New Enterprise, Martinsburg, Lakemont,
  Everett, Bellwood, Warriors Mark, Cresson and Gallitzin.

This includes the following Interstates...
 The Pennsylvania Turnpike from mile markers 124 to 161.
 Interstate 99 from mile markers 0 to 73.

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 4006 7878 4082 7844 4084 7786 4052 7790
      4024 7806 4009 7820 4007 7819 3979 7840
      3978 7897
TIME...MOT...LOC 2202Z 253DEG 26KT 4076 7843 4037 7856 4009 7878 3976
7902

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, 6:16 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
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.