Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 129, NWS State College, PA

July 12, 2021Cumberland County, Perry County, Pennsylvania

NWS State College, PA issued this severe thunderstorm warning at Jul 12, 2021, 2:49 PM EDT for Cumberland County, Perry County, Pennsylvania. It was in force for 41 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 12, 2021, 2:49 PM EDT (18:49 UTC)
Expired: Jul 12, 2021, 3:30 PM EDT
In force: 41 min
Issued by: NWS State College, PA
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Cumberland County, PA, Perry County, PA

The radar

The State College radar (KCCX), 87 km from the middle of the area, began a volume at 18:49 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 12, 3:20 PM EDT	TSTM WND DMG	2 Wsw Landisburg, PA	TREES AND WIRES DOWN.
Jul 12, 3:25 PM EDT	TSTM WND DMG	4 Ene Loysville, PA	TREE ON WIRES.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 6.8 hours before the alert went out and 151 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: 974 J/kg
Mixed-layer CIN: -83 J/kg
Mixed-layer LCL: 724 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 10 m²/s²
0-3 km storm-relative helicity: 53 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.8

Open this sounding in Storm Lab

The text

As transmitted.

459 
WUUS51 KCTP 121849
SVRCTP
PAC041-099-121930-
/O.NEW.KCTP.SV.W.0129.210712T1849Z-210712T1930Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service State College PA
249 PM EDT Mon Jul 12 2021

The National Weather Service in State College PA has issued a

* Severe Thunderstorm Warning for...
  Northwestern Cumberland County in south central Pennsylvania...
  Central Perry County in south central Pennsylvania...

* Until 330 PM EDT.

* At 248 PM EDT, a severe thunderstorm was located over Colonel
  Denning State Park, moving east at 25 mph.

  HAZARD...60 mph wind gusts and torrential rainfall.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Newport, New Bloomfield, Colonel Denning State Park, Loysville,
  Shermansdale, Blain and Landisburg.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4025 7751 4033 7754 4050 7713 4029 7706
      4024 7742
TIME...MOT...LOC 1848Z 251DEG 21KT 4031 7747 

HAIL...<.75IN
WIND...60MPH
 
$$

DeVoir

1 follow-up statement

550 
WWUS51 KCTP 121927
SVSCTP

Severe Weather Statement
National Weather Service State College PA
327 PM EDT Mon Jul 12 2021

PAC041-099-121935-
/O.EXP.KCTP.SV.W.0129.000000T0000Z-210712T1930Z/
Cumberland PA-Perry PA-
327 PM EDT Mon Jul 12 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN CUMBERLAND AND
CENTRAL PERRY COUNTIES WILL EXPIRE AT 330 PM EDT...
                
Law enforcement reported trees and wires knocked down with the storm 
as it passed areas west of Landisburg around 310 PM EDT. However, 
the storm which prompted the warning has weakened below severe 
limits, and no longer poses an immediate threat to life or property. 
Therefore, the warning will be allowed to expire. 

LAT...LON 4025 7751 4033 7754 4050 7713 4029 7706
      4024 7742
TIME...MOT...LOC 1925Z 251DEG 21KT 4038 7722 

$$

DeVoir

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, 9:32 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, 2:59 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.