Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 114, NWS State College, PA

July 11, 20214 counties in Pennsylvania

NWS State College, PA issued this severe thunderstorm warning at Jul 11, 2021, 5:30 PM EDT for 4 counties in Pennsylvania. It was in force for 45 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, 5:30 PM EDT (21:30 UTC)
Expired
Jul 11, 2021, 6:15 PM EDT
In force
45 min
Issued by
NWS State College, PA
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties Blair County, PA, Centre County, PA, Clearfield County, PA, Huntingdon County, PA

The radar

The State College radar (KCCX), 31 km from the middle of the area, began a volume at 21:32 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

TimeReportWhereRemark
Jul 11, 5:32 PM EDTTSTM WND DMGBellwood, PATREES AND WIRES DOWN.
Jul 11, 6:13 PM EDTTSTM WND DMGAltoona, PAROOF DAMAGE TO A BUILDING IN THE 1800 BLOCK OF UNION AVE.

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.

IssuedProductOfficeLasted
Jul 11, 2:40 PM EDTSevere Thunderstorm WatchSPC8 hr

The nearest sounding before it

Pittsburgh, PA (KPIT), launched 12:00Z, 9.5 hours before the alert went out and 166 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-pSkew-T log-p diagram, Pittsburgh, PA at 12:00Z on 2021-07-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 5 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Pittsburgh, PA at 12:00Z on 2021-07-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 90 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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.

148 
WUUS51 KCTP 112130
SVRCTP
PAC013-027-033-061-112215-
/O.NEW.KCTP.SV.W.0114.210711T2130Z-210711T2215Z/

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

The National Weather Service in State College PA has issued a

* Severe Thunderstorm Warning for...
  East central Clearfield County in central Pennsylvania...
  Northwestern Huntingdon County in central Pennsylvania...
  Southwestern Centre County in central Pennsylvania...
  Northeastern Blair County in central Pennsylvania...

* Until 615 PM EDT.

* At 530 PM EDT, a severe thunderstorm was located over Tipton,
  moving northeast at 40 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, Tyrone, Philipsburg, Stormstown, Bald Eagle, Lakemont,
  Bellwood, Warriors Mark, Williamsburg, Tipton, Chester Hill, Snow
  Shoe, North Philipsburg, Clarence, Port Matilda, South Philipsburg,
  Sandy Ridge, Moshannon, Spruce Creek and Pine Glen.

For those driving on Interstate 80, this includes areas between the
Kylertown and Milesburg exits, specifically from mile markers 133 to
155.

This includes Interstate 99 from mile markers 32 to 70.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Large hail and damaging winds and continuous cloud to ground
lightning is occurring with this storm. Move indoors immediately.
Lightning is one of nature's leading killers. Remember, if you can
hear thunder, you are close enough to be struck by lightning.

&&

LAT...LON 4040 7825 4050 7846 4111 7810 4098 7779
TIME...MOT...LOC 2130Z 209DEG 37KT 4062 7828 

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

Martin
1 follow-up statement
984 
WWUS51 KCTP 112154
SVSCTP

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

PAC013-027-033-061-112215-
/O.CON.KCTP.SV.W.0114.000000T0000Z-210711T2215Z/
Clearfield PA-Huntingdon PA-Centre PA-Blair PA-
554 PM EDT Sun Jul 11 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 PM EDT
FOR EAST CENTRAL CLEARFIELD...NORTHWESTERN HUNTINGDON...SOUTHWESTERN
CENTRE AND NORTHEASTERN BLAIR COUNTIES...

At 553 PM EDT, a severe thunderstorm was located near Port Matilda, 
moving northeast at 40 mph. Other storms were just south of this 
storm.

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, Tyrone, Philipsburg, Stormstown, Bald Eagle, Lakemont,
Bellwood, Warriors Mark, Williamsburg, Tipton, Chester Hill, Snow
Shoe, North Philipsburg, Clarence, Port Matilda, South Philipsburg,
Sandy Ridge, Moshannon, Spruce Creek and Pine Glen.

For those driving on Interstate 80, this includes areas between the
Kylertown and Milesburg exits, specifically from mile markers 133 to
155.

This includes Interstate 99 from mile markers 32 to 70.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Continuous cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.

&&

LAT...LON 4040 7825 4050 7846 4111 7810 4098 7779
TIME...MOT...LOC 2153Z 209DEG 37KT 4083 7812 

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

Martin

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 11, 3:29 PM EDTSpecial Weather StatementCTPCameron31 min
Jul 11, 3:51 PM EDTSpecial Weather StatementCTPCambria39 min
Jul 11, 4:42 PM EDTFlash Flood WatchCTPColumbia, Lycoming, Sullivan, Tioga9 hr
Jul 11, 4:48 PM EDTSevere Thunderstorm WarningCTPCameron, Elk42 min
Jul 11, 4:51 PM EDTSevere Thunderstorm WarningCTPClearfield, Elk39 min
Jul 11, 4:59 PM EDTSpecial Weather StatementCTPBlair46 min
Jul 11, 5:06 PM EDTSpecial Weather StatementCTPSnyder39 min
Jul 11, 5:06 PM EDTSevere Thunderstorm WarningCTPBlair, Huntingdon24 min
Jul 11, 5:10 PM EDTTornado WarningCTPCameron, Elk24 min
Jul 11, 5:18 PM EDTSevere Thunderstorm WarningCTPElk46 min
Jul 11, 5:19 PM EDTSevere Thunderstorm WarningCTPCameron, Clearfield, Elk41 min
Jul 11, 5:25 PM EDTSevere Thunderstorm WarningCTPCambria, Somerset65 min
Jul 11, 5:37 PM EDTAreal Flood AdvisoryCTPCameron, Clearfield, Clinton, Elk, Potter2 hr
Jul 11, 5:52 PM EDTSpecial Weather StatementCTPBedford23 min
Jul 11, 5:55 PM EDTSevere Thunderstorm WarningCTPCameron, Centre, Clearfield, Clinton, Potter35 min
Jul 11, 6:03 PM EDTSevere Thunderstorm WarningCTPBedford, Blair, Cambria, Centre, Clearfield, Huntingdon and 1 more57 min
Jul 11, 6:16 PM EDTTornado WarningCTPCentre, Clinton29 min
Jul 11, 6:23 PM EDTSevere Thunderstorm WarningCTPCentre, Clinton52 min
Jul 11, 6:35 PM EDTSpecial Weather StatementCTPSullivan25 min
Jul 11, 6:39 PM EDTSevere Thunderstorm WarningCTPCentre, Clinton51 min
Jul 11, 6:48 PM EDTTornado WarningCTPCentre, Clinton27 min
Jul 11, 6:57 PM EDTSevere Thunderstorm WarningCTPBedford, Centre, Cumberland, Franklin, Fulton, Huntingdon and 3 more63 min
Jul 11, 7:02 PM EDTSevere Thunderstorm WarningCTPColumbia, Sullivan43 min
Jul 11, 7:25 PM EDTSevere Thunderstorm WarningCTPClinton50 min
Jul 11, 7:31 PM EDTSevere Thunderstorm WarningCTPCentre, Clinton, Juniata, Mifflin, Snyder, Union44 min
Jul 11, 7:39 PM EDTTornado WarningCTPClinton, Lycoming36 min
Jul 11, 7:48 PM EDTSpecial Weather StatementCTPSullivan27 min
Jul 11, 7:58 PM EDTSevere Thunderstorm WarningCTPBedford, Cumberland, Franklin, Fulton, Huntingdon, Juniata and 2 more62 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2021Every 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.