Alert archive / Pennsylvania / Tornado Warnings in 2021

Tornado Warning 6, NWS State College, PA

July 11, 2021Dauphin County, Pennsylvania

NWS State College, PA issued this tornado warning at Jul 11, 2021, 8:52 PM EDT for Dauphin County, Pennsylvania. It was in force for 23 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 11, 2021, 8:52 PM EDT (00:52 UTC)
Expired: Jul 11, 2021, 9:15 PM EDT
In force: 23 min
Issued by: NWS State College, PA
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

County Dauphin County, PA

The radar

The State College radar (KCCX), 105 km from the middle of the area, began a volume at 00:53 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.

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 00:00Z, 0.9 hours before the alert went out and 180 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: 811 J/kg
Mixed-layer CIN: -23 J/kg
Mixed-layer LCL: 1342 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: 25 m²/s²
0-3 km storm-relative helicity: 57 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

786 
WFUS51 KCTP 120052
TORCTP
PAC043-120115-
/O.NEW.KCTP.TO.W.0006.210712T0052Z-210712T0115Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service State College PA
852 PM EDT Sun Jul 11 2021

The National Weather Service in State College PA has issued a

* Tornado Warning for...
  Northern Dauphin County in south central Pennsylvania...

* Until 915 PM EDT.

* At 852 PM EDT, severe thunderstorms capable of producing both
  tornadoes and extensive straight line wind damage were located over
  Millersburg, moving northeast at 35 mph.

  HAZARD...Tornado.

  SOURCE...Radar indicated rotation.

  IMPACT...Flying debris will be dangerous to those caught without 
           shelter. Mobile homes will be damaged or destroyed. 
           Damage to roofs, windows, and vehicles will occur.  Tree 
           damage is likely.

* These dangerous storms will be near...
  Elizabethville around 900 PM EDT.
  Lykens around 910 PM EDT.

Other locations impacted by this tornadic thunderstorm include
Enders, Gratz, Wiconisco and Halifax.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

Tornadoes are extremely difficult to see and confirm at night. Do not
wait to see or hear the tornado. TAKE COVER NOW!

&&

LAT...LON 4047 7694 4049 7695 4050 7698 4053 7698
      4063 7672 4052 7664
TIME...MOT...LOC 0052Z 243DEG 31KT 4051 7694 

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

Lambert

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 11, 8:03 PM EDT	Severe Thunderstorm Warning	CTP	Clinton, Columbia, Lycoming, Montour, Northumberland, Snyder and 1 more	42 min
Jul 11, 8:43 PM EDT	Severe Thunderstorm Warning	CTP	Columbia, Lycoming, Montour, Northumberland, Sullivan	62 min
Jul 11, 8:44 PM EDT	Severe Thunderstorm Warning	CTP	Cumberland, Dauphin, Lebanon, Perry, Schuylkill	76 min
Jul 11, 9:07 PM EDT	Areal Flood Advisory	CTP	Columbia, Lycoming, Montour, Northumberland, Sullivan, Union	2 hr
Jul 11, 9:08 PM EDT	Special Weather Statement	CTP	Franklin	37 min
Jul 11, 9:32 PM EDT	Special Weather Statement	CTP	Fulton	28 min
Jul 11, 9:32 PM EDT	Severe Thunderstorm Warning	CTP	Cumberland, Dauphin, Lebanon, York	58 min
Jul 11, 9:52 PM EDT	Severe Thunderstorm Warning	CTP	Schuylkill	53 min
Jul 11, 10:06 PM EDT	Flash Flood Warning	CTP	Cumberland, Dauphin, Lebanon, York	118 min
Jul 11, 10:35 PM EDT	Special Weather Statement	CTP	Lebanon, York	70 min
Jul 12, 12:04 AM EDT	Areal Flood Advisory	CTP	Cumberland, Dauphin, Lebanon, York	116 min
Jul 12, 1:21 PM EDT	Flash Flood Watch	CTP	Columbia, Cumberland, Dauphin, Juniata, Lebanon, Lycoming and 12 more	13 hr
Jul 12, 2:15 PM EDT	Special Weather Statement	CTP	Lancaster	60 min
Jul 12, 2:34 PM EDT	Special Weather Statement	CTP	Mifflin	26 min
Jul 12, 2:36 PM EDT	Special Weather Statement	CTP	Perry	24 min
Jul 12, 2:45 PM EDT	Special Weather Statement	CTP	Adams, Franklin	60 min
Jul 12, 2:49 PM EDT	Severe Thunderstorm Warning	CTP	Cumberland, Perry	41 min
Jul 12, 2:59 PM EDT	Special Weather Statement	CTP	Mifflin	31 min
Jul 12, 3:17 PM EDT	Special Weather Statement	CTP	Lebanon	43 min
Jul 12, 3:30 PM EDT	Special Weather Statement	CTP	Juniata	45 min
Jul 12, 3:31 PM EDT	Areal Flood Advisory	CTP	Lancaster	119 min
Jul 12, 3:55 PM EDT	Severe Thunderstorm Warning	CTP	Dauphin, Perry	35 min
Jul 12, 3:56 PM EDT	Flash Flood Warning	CTP	Lancaster	2 hr
Jul 12, 3:57 PM EDT	Severe Thunderstorm Warning	CTP	Lancaster	63 min
Jul 12, 3:59 PM EDT	Severe Thunderstorm Warning	CTP	Cumberland, York	46 min
Jul 12, 4:11 PM EDT	Severe Thunderstorm Warning	CTP	Cumberland, Dauphin, Lancaster, Lebanon, York	34 min
Jul 12, 4:42 PM EDT	Severe Thunderstorm Warning	CTP	Dauphin, Lancaster, Lebanon, York	63 min
Jul 12, 4:57 PM EDT	Areal Flood Advisory	CTP	Lancaster	2 hr
Jul 12, 5:29 PM EDT	Severe Thunderstorm Warning	CTP	Lancaster	61 min
Jul 12, 5:42 PM EDT	Areal Flood Advisory	CTP	Lancaster	93 min
Jul 12, 6:31 PM EDT	Areal Flood Advisory	CTP	Lancaster	119 min
Jul 12, 6:43 PM EDT	Areal Flood Advisory	CTP	Tioga	92 min

Nearby

Tornado Warnings in Pennsylvania, 2021 Every tornado warning in 2021 Tornadoes 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.