Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 130, NWS State College, PA

July 12, 2021Dauphin County, Perry County, Pennsylvania

NWS State College, PA issued this severe thunderstorm warning at Jul 12, 2021, 3:55 PM EDT for Dauphin County, Perry County, Pennsylvania. It was in force for 35 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, 3:55 PM EDT (19:55 UTC)
Expired: Jul 12, 2021, 4:30 PM EDT
In force: 35 min
Issued by: NWS State College, PA
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Dauphin County, PA, Perry County, PA

The radar

The State College radar (KCCX), 115 km from the middle of the area, began a volume at 19:56 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, 4:17 PM EDT	TSTM WND DMG	2 Wnw Ellendale Forge, PA	TREE DOWN ON WIRES.
Jul 12, 4:18 PM EDT	TSTM WND DMG	2 Wnw Ellendale Forge, PA	LARGE TREE ON WIRES ACROSS CLARKS VALLEY RD.

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
Jul 12, 3:34 PM EDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 7.9 hours before the alert went out and 172 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.

124 
WUUS51 KCTP 121955
SVRCTP
PAC043-099-122030-
/O.NEW.KCTP.SV.W.0130.210712T1955Z-210712T2030Z/

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

The National Weather Service in State College PA has issued a

* Severe Thunderstorm Warning for...
  Central Dauphin County in south central Pennsylvania...
  Northeastern Perry County in south central Pennsylvania...

* Until 430 PM EDT.

* At 355 PM EDT, a severe thunderstorm was located near Duncannon,
  moving east at 25 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* This severe thunderstorm will be near...
  New Buffalo and Millersburg around 400 PM EDT.
  Marysville and Rockville around 410 PM EDT.
  Linglestown and Paxtonia around 420 PM EDT.
  Dehart Dam, Penn National Race Course and Skyline View around 430 
  PM EDT.

Other locations impacted by this severe thunderstorm include Enders,
Dauphin and Halifax.

This includes Interstate 81 from mile markers 71 to 81.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4035 7714 4053 7713 4056 7654 4054 7655
      4048 7668 4032 7662 4030 7661
TIME...MOT...LOC 1955Z 272DEG 27KT 4044 7704 

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

Jurewicz

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, 2:49 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, 3:56 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.