Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 110, NWS State College, PA

July 11, 2021Blair County, Huntingdon County, Pennsylvania

NWS State College, PA issued this severe thunderstorm warning at Jul 11, 2021, 5:06 PM EDT for Blair County, Huntingdon County, Pennsylvania. It was in force for 24 min. 3 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, 5:06 PM EDT (21:06 UTC)
Expired: Jul 11, 2021, 5:30 PM EDT
In force: 24 min
Issued by: NWS State College, PA
Area: Storm-based polygon
Tornado: Possible
Hail: 1.0 in
Wind: 60.0 mph

Counties Blair County, PA, Huntingdon County, PA

The radar

The State College radar (KCCX), 52 km from the middle of the area, began a volume at 21:11 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, 5:14 PM EDT	TSTM WND DMG	1 Ene Altoona, PA	TREES DOWN IN THE 400 BLOCK OF PLEASANT VALLEY BLVD.
Jul 11, 5:15 PM EDT	TSTM WND DMG	2 Ne Altoona, PA	SEVERAL REPORTS OF TREES AND WIRES DOWN ACROSS THE EAST END OF ALTOONA.
Jul 11, 5:32 PM EDT	TSTM WND DMG	Bellwood, PA	TREES AND WIRES DOWN.

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, 9.1 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.

180 
WUUS51 KCTP 112106
SVRCTP
PAC013-061-112130-
/O.NEW.KCTP.SV.W.0110.210711T2106Z-210711T2130Z/

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

The National Weather Service in State College PA has issued a

* Severe Thunderstorm Warning for...
  Northwestern Huntingdon County in central Pennsylvania...
  Blair County in central Pennsylvania...

* Until 530 PM EDT.

* At 505 PM EDT, a severe thunderstorm was located over
  Hollidaysburg, moving northeast at 25 mph.

  HAZARD...60 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees.

* Locations impacted include...
  Altoona, Hollidaysburg, Tyrone, Lakemont, Bellwood, Williamsburg,
  Duncansville, Tipton, Spruce Creek, Birmingham, Sinking Valley,
  Canoe Creek State Park, Royer, Alexandria, Newry, Peoples Natural
  Gas Field, Penn State Altoona, Delgrosso's Amusement Park and
  Lakemont Park And Island Waterpark.

This includes Interstate 99 from mile markers 25 to 47.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4042 7851 4070 7837 4072 7835 4059 7805
      4033 7826
TIME...MOT...LOC 2105Z 208DEG 22KT 4042 7838 

TORNADO...POSSIBLE
HAIL...1.00IN
WIND...60MPH
 
$$

Martin

1 follow-up statement

379 
WWUS51 KCTP 112124
SVSCTP

Severe Weather Statement
National Weather Service State College PA
524 PM EDT Sun Jul 11 2021

PAC013-061-112130-
/O.CON.KCTP.SV.W.0110.000000T0000Z-210711T2130Z/
Huntingdon PA-Blair PA-
524 PM EDT Sun Jul 11 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 PM EDT
FOR NORTHWESTERN HUNTINGDON AND BLAIR COUNTIES...

At 523 PM EDT, a severe thunderstorm was located near Canoe Creek
State Park, moving northeast at 25 mph.

HAZARD...60 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees.

Locations impacted include...
Altoona, Hollidaysburg, Tyrone, Lakemont, Bellwood, Williamsburg,
Duncansville, Tipton, Spruce Creek, Birmingham, Sinking Valley, Canoe
Creek State Park, Royer, Alexandria, Newry, Peoples Natural Gas
Field, Penn State Altoona, Delgrosso's Amusement Park and Lakemont
Park And Island Waterpark.

This includes Interstate 99 from mile markers 25 to 47.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4042 7851 4070 7837 4072 7835 4059 7805
      4033 7826
TIME...MOT...LOC 2123Z 208DEG 22KT 4052 7831 

TORNADO...POSSIBLE
HAIL...1.00IN
WIND...60MPH
 
$$

Martin

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, 5:10 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
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.