Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 221, NWS State College, PA

August 12, 20216 counties in Pennsylvania

NWS State College, PA issued this severe thunderstorm warning at Aug 12, 2021, 9:59 PM EDT for 6 counties in Pennsylvania. It was in force for 31 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: Aug 12, 2021, 9:59 PM EDT (01:59 UTC)
Expired: Aug 12, 2021, 10:30 PM EDT
In force: 31 min
Issued by: NWS State College, PA
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Columbia County, PA, Dauphin County, PA, Lebanon County, PA, Northumberland County, PA, Perry County, PA, Schuylkill County, PA

The radar

The State College radar (KCCX), 122 km from the middle of the area, began a volume at 02:03 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
Aug 12, 10:00 PM EDT	TSTM WND DMG	1 W Kneass, PA	TREES ON WIRES
Aug 12, 10:15 PM EDT	TSTM WND DMG	Cabel, PA	TREES ACROSS ROAD.
Aug 12, 10:38 PM EDT	TSTM WND DMG	Beuchler, PA	TREE ACROSS I-81 BLOCKING ROADWAY.

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
Aug 12, 1:11 PM EDT	Severe Thunderstorm Watch	SPC	9 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 00:00Z, 2.0 hours before the alert went out and 197 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: 2808 J/kg
Mixed-layer CIN: -24 J/kg
Mixed-layer LCL: 1565 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: 38 m²/s²
0-3 km storm-relative helicity: 153 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 4.9

Open this sounding in Storm Lab

The text

As transmitted.

122 
WUUS51 KCTP 130159
SVRCTP
PAC037-043-075-097-099-107-130230-
/O.NEW.KCTP.SV.W.0221.210813T0159Z-210813T0230Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service State College PA
959 PM EDT Thu Aug 12 2021

The National Weather Service in State College PA has issued a

* Severe Thunderstorm Warning for...
  Western Schuylkill County in central Pennsylvania...
  Southern Northumberland County in central Pennsylvania...
  Dauphin County in south central Pennsylvania...
  Southeastern Columbia County in central Pennsylvania...
  East central Perry County in south central Pennsylvania...
  Northwestern Lebanon County in south central Pennsylvania...

* Until 1030 PM EDT.

* At 958 PM EDT, severe thunderstorms were located along a line
  extending from Rebuck to Marysville, moving east at 40 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Shamokin, Linglestown, Mount Carmel, Kulpmont, Ashland, Skyline
  View, Valley View, Millersburg, Marysville, Elysburg,
  Fairview-Ferndale, Trevorton, Lykens, Tremont, Duncannon,
  Girardville, Elizabethville, Marshallton, Williamstown and Tower
  City.

This includes the following Interstates...
 Interstate 78 from mile markers 0 to 3.
 Interstate 81 from mile markers 75 to 117.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

To report severe weather, contact your nearest law enforcement
agency. They will send your report to the National Weather Service
office in State College PA.

Large hail and damaging winds and continuous cloud to ground
lightning is occurring with these storms. 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 4036 7652 4031 7712 4061 7689 4077 7684
      4097 7621 4095 7621
TIME...MOT...LOC 0158Z 257DEG 35KT 4073 7675 4036 7696 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Banghoff

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 12, 8:05 PM EDT	Severe Thunderstorm Warning	CTP	Clinton, Lycoming, Sullivan, Tioga	40 min
Aug 12, 8:16 PM EDT	Special Weather Statement	CTP	Blair, Huntingdon, Mifflin	29 min
Aug 12, 8:28 PM EDT	Severe Thunderstorm Warning	CTP	Lycoming, Sullivan	47 min
Aug 12, 8:33 PM EDT	Special Weather Statement	CTP	Union	12 min
Aug 12, 8:42 PM EDT	Severe Thunderstorm Warning	CTP	Centre, Clinton, Lycoming, Mifflin, Union	48 min
Aug 12, 8:46 PM EDT	Special Weather Statement	CTP	Juniata, Mifflin, Perry, Snyder	29 min
Aug 12, 9:01 PM EDT	Severe Thunderstorm Warning	CTP	Columbia, Lycoming, Montour, Northumberland, Union	44 min
Aug 12, 9:14 PM EDT	Special Weather Statement	CTP	Sullivan	31 min
Aug 12, 9:23 PM EDT	Severe Thunderstorm Warning	CTP	Columbia, Montour, Northumberland, Snyder, Union	67 min
Aug 12, 9:25 PM EDT	Special Weather Statement	CTP	Perry	20 min
Aug 12, 9:44 PM EDT	Special Weather Statement	CTP	Dauphin	31 min
Aug 12, 10:31 PM EDT	Severe Thunderstorm Warning	CTP	Columbia, Dauphin, Lebanon, Northumberland, Schuylkill	59 min
Aug 12, 10:34 PM EDT	Special Weather Statement	CTP	Lebanon	26 min
Aug 12, 11:03 PM EDT	Special Weather Statement	CTP	Lebanon	27 min
Aug 12, 11:10 PM EDT	Severe Thunderstorm Warning	CTP	Dauphin, Lancaster, Lebanon, York	34 min
Aug 13, 1:49 PM EDT	Special Weather Statement	CTP	Cumberland, Franklin, Perry	41 min
Aug 13, 1:59 PM EDT	Special Weather Statement	CTP	Fulton	31 min
Aug 13, 2:12 PM EDT	Severe Thunderstorm Warning	CTP	Adams, Cumberland, Franklin, Fulton, Huntingdon, Juniata and 2 more	63 min
Aug 13, 2:17 PM EDT	Special Weather Statement	CTP	Cameron	28 min
Aug 13, 2:22 PM EDT	Special Weather Statement	CTP	Potter	38 min
Aug 13, 2:35 PM EDT	Special Weather Statement	CTP	Clinton	25 min
Aug 13, 2:59 PM EDT	Special Weather Statement	CTP	Clinton	31 min
Aug 13, 3:00 PM EDT	Special Weather Statement	CTP	Potter	30 min
Aug 13, 3:04 PM EDT	Special Weather Statement	CTP	Potter	26 min
Aug 13, 3:12 PM EDT	Severe Thunderstorm Warning	CTP	Adams, Franklin	63 min
Aug 13, 3:14 PM EDT	Severe Thunderstorm Warning	CTP	Cumberland, Perry	61 min
Aug 13, 3:22 PM EDT	Severe Thunderstorm Warning	CTP	Clinton, Lycoming	38 min
Aug 13, 3:26 PM EDT	Special Weather Statement	CTP	Dauphin	34 min
Aug 13, 3:35 PM EDT	Severe Thunderstorm Warning	CTP	York	40 min
Aug 13, 3:43 PM EDT	Severe Thunderstorm Warning	CTP	Dauphin, Juniata, Northumberland, Perry, Snyder	29 min
Aug 13, 3:43 PM EDT	Severe Thunderstorm Warning	CTP	Cumberland, Dauphin, Perry	47 min
Aug 13, 3:56 PM EDT	Areal Flood Advisory	CTP	Adams, Cumberland, Dauphin, Perry, York	2 hr
Aug 13, 3:57 PM EDT	Special Weather Statement	CTP	Lycoming	33 min
Aug 13, 4:07 PM EDT	Severe Thunderstorm Warning	CTP	Adams, Dauphin, Lancaster, Lebanon, York	53 min
Aug 13, 4:20 PM EDT	Special Weather Statement	CTP	Sullivan	25 min
Aug 13, 4:30 PM EDT	Severe Thunderstorm Warning	CTP	Columbia, Lycoming, Sullivan	60 min
Aug 13, 4:41 PM EDT	Special Weather Statement	CTP	Clinton	34 min
Aug 13, 4:59 PM EDT	Special Weather Statement	CTP	York	46 min
Aug 13, 5:14 PM EDT	Special Weather Statement	CTP	Montour	16 min
Aug 13, 5:29 PM EDT	Severe Thunderstorm Warning	CTP	Columbia, Lycoming, Sullivan	31 min
Aug 13, 5:38 PM EDT	Special Weather Statement	CTP	Snyder, Union	37 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.