Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 127, NWS State College, PA

July 11, 20214 counties in Pennsylvania

NWS State College, PA issued this severe thunderstorm warning at Jul 11, 2021, 9:32 PM EDT for 4 counties in Pennsylvania. It was in force for 58 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, 9:32 PM EDT (01:32 UTC)
Expired: Jul 11, 2021, 10:30 PM EDT
In force: 58 min
Issued by: NWS State College, PA
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Cumberland County, PA, Dauphin County, PA, Lebanon County, PA, York County, PA

The radar

The State College radar (KCCX), 125 km from the middle of the area, began a volume at 01:34 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, 1.5 hours before the alert went out and 158 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.

853 
WUUS51 KCTP 120132
SVRCTP
PAC041-043-075-133-120230-
/O.NEW.KCTP.SV.W.0127.210712T0132Z-210712T0230Z/

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

The National Weather Service in State College PA has issued a

* Severe Thunderstorm Warning for...
  Northwestern York County in south central Pennsylvania...
  Dauphin County in south central Pennsylvania...
  Northeastern Cumberland County in south central Pennsylvania...
  Lebanon County in south central Pennsylvania...

* Until 1030 PM EDT.

* At 931 PM EDT, severe thunderstorms were located along a line
  extending from near New Buffalo to Enola to Shiremanstown to
  Dillsburg to Mount Holly Springs, moving east at 30 mph.

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

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Harrisburg, Lebanon, Lower Allen, Hershey, Colonial Park, Progress,
  Mechanicsburg, Middletown, Camp Hill, Palmyra, New Cumberland,
  Linglestown, Enola, Steelton, Annville, Lemoyne, Hummelstown,
  Cornwall, Myerstown and Paxtonia.

This includes the following Interstates...
 The Pennsylvania Turnpike from mile markers 233 to 266.
 Interstate 78 from mile markers 0 to 8.
 Interstate 81 from mile markers 59 to 96.
 Interstate 83 from mile markers 31 to 50.
 Interstate 283 from mile markers 0 to 2.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4006 7716 4021 7704 4031 7701 4033 7691
      4036 7694 4036 7700 4044 7699 4048 7694
      4056 7654 4037 7623 4030 7623 4027 7627
      4019 7661 4015 7670 4012 7672
TIME...MOT...LOC 0131Z 260DEG 24KT 4041 7692 4031 7693 4022 7694 4013
7705 4010 7717

HAIL...0.75IN
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, 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, 8:52 PM EDT	Tornado Warning	CTP	Dauphin	23 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, 9:52 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

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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.