Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 182, NWS State College, PA

July 17, 20215 counties in Pennsylvania

NWS State College, PA issued this severe thunderstorm warning at Jul 17, 2021, 6:44 PM EDT for 5 counties in Pennsylvania. It was in force for 46 min. 1 report 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 17, 2021, 6:44 PM EDT (22:44 UTC)
Expired: Jul 17, 2021, 7:30 PM EDT
In force: 46 min
Issued by: NWS State College, PA
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Adams County, PA, Dauphin County, PA, Lancaster County, PA, Lebanon County, PA, York County, PA

The radar

The State College radar (KCCX), 130 km from the middle of the area, began a volume at 22:46 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 17, 7:00 PM EDT	TSTM WND DMG	1 Ene Colonial Park, PA	TREES DOWN ON DEVONSHIRE ROAD IN WEST HANOVER TOWNSHIP.

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 17, 1:13 PM EDT	Severe Thunderstorm Watch	SPC	10 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 10.7 hours before the alert went out and 136 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: 538 J/kg
Mixed-layer CIN: -141 J/kg
Mixed-layer LCL: 1337 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 37 m²/s²
0-3 km storm-relative helicity: 43 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

144 
WUUS51 KCTP 172244
SVRCTP
PAC001-043-071-075-133-172330-
/O.NEW.KCTP.SV.W.0182.210717T2244Z-210717T2330Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service State College PA
644 PM EDT Sat Jul 17 2021

The National Weather Service in State College PA has issued a

* Severe Thunderstorm Warning for...
  Northwestern Lancaster County in south central Pennsylvania...
  Adams County in south central Pennsylvania...
  York County in south central Pennsylvania...
  Southern Dauphin County in south central Pennsylvania...
  Lebanon County in south central Pennsylvania...

* Until 730 PM EDT.

* At 644 PM EDT, a severe thunderstorm was located near Hampton,
  moving northeast at 35 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, York, Lebanon, Lower Allen, Hanover, Hershey, Colonial
  Park, Weigelstown, Elizabethtown, Columbia, Progress, Middletown,
  Gettysburg, Mount Joy, Palmyra, New Cumberland, Parkville, Red
  Lion, Linglestown and Steelton.

This includes the following Interstates...
 The Pennsylvania Turnpike from mile markers 239 to 271.
 Interstate 78 from mile markers 0 to 8.
 Interstate 81 from mile markers 67 to 96.
 Interstate 83 between mile markers 5 and 39...and from mile markers
43 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 this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 3972 7729 4000 7739 4003 7719 4015 7703
      4016 7691 4020 7693 4023 7690 4021 7689
      4023 7686 4029 7692 4055 7654 4042 7631
      4000 7638 3972 7676
TIME...MOT...LOC 2244Z 241DEG 30KT 3991 7714 

HAIL...0.75IN
WIND...60MPH
 
$$

Evanego

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 16, 9:11 PM EDT	Special Weather Statement	CTP	Cumberland	34 min
Jul 16, 10:39 PM EDT	Areal Flood Advisory	CTP	Cumberland, Dauphin, Juniata, Northumberland, Perry, Snyder	2 hr
Jul 17, 4:33 AM EDT	Special Weather Statement	CTP	Warren	57 min
Jul 17, 6:36 AM EDT	Special Weather Statement	CTP	Warren	69 min
Jul 17, 7:46 AM EDT	Special Weather Statement	CTP	Elk, McKean	59 min
Jul 17, 10:23 AM EDT	Special Weather Statement	CTP	McKean	37 min
Jul 17, 12:01 PM EDT	Areal Flood Advisory	CTP	McKean	119 min
Jul 17, 12:35 PM EDT	Special Weather Statement	CTP	Potter	40 min
Jul 17, 12:55 PM EDT	Areal Flood Advisory	CTP	Warren	2 hr
Jul 17, 1:23 PM EDT	Special Weather Statement	CTP	Clinton	37 min
Jul 17, 1:33 PM EDT	Special Weather Statement	CTP	Lancaster	27 min
Jul 17, 1:48 PM EDT	Severe Thunderstorm Warning	CTP	Lancaster, York	42 min
Jul 17, 1:55 PM EDT	Flash Flood Warning	CTP	Cameron, Elk, McKean, Potter, Warren	3 hr
Jul 17, 2:13 PM EDT	Severe Thunderstorm Warning	CTP	Lancaster, Lebanon	47 min
Jul 17, 2:29 PM EDT	Severe Thunderstorm Warning	CTP	Lancaster	46 min
Jul 17, 2:46 PM EDT	Special Weather Statement	CTP	Cambria	29 min
Jul 17, 2:47 PM EDT	Areal Flood Advisory	CTP	Lancaster, Lebanon, Schuylkill, York	2 hr
Jul 17, 2:52 PM EDT	Severe Thunderstorm Warning	CTP	Schuylkill	38 min
Jul 17, 2:56 PM EDT	Severe Thunderstorm Warning	CTP	Lancaster, York	34 min
Jul 17, 3:02 PM EDT	Severe Thunderstorm Warning	CTP	Lebanon, Schuylkill	43 min
Jul 17, 3:04 PM EDT	Severe Thunderstorm Warning	CTP	Cambria, Clearfield, Somerset	56 min
Jul 17, 3:06 PM EDT	Special Weather Statement	CTP	Blair	24 min
Jul 17, 3:14 PM EDT	Severe Thunderstorm Warning	CTP	Lancaster	61 min
Jul 17, 3:17 PM EDT	Flash Flood Warning Considerable damage threat	CTP	Lycoming, Tioga	3 hr
Jul 17, 3:35 PM EDT	Special Weather Statement	CTP	Centre	25 min
Jul 17, 3:42 PM EDT	Special Weather Statement	CTP	York	33 min
Jul 17, 3:45 PM EDT	Special Weather Statement	CTP	Huntingdon	30 min
Jul 17, 3:48 PM EDT	Special Weather Statement	CTP	Lancaster	27 min
Jul 17, 3:52 PM EDT	Severe Thunderstorm Warning	CTP	Centre, Clearfield	23 min
Jul 17, 4:03 PM EDT	Special Weather Statement	CTP	Dauphin	27 min
Jul 17, 4:05 PM EDT	Severe Thunderstorm Warning	CTP	Centre, Huntingdon, Juniata, Mifflin	55 min
Jul 17, 4:07 PM EDT	Areal Flood Advisory	CTP	Adams, Cumberland, Dauphin, Lancaster, Lebanon, York	2 hr
Jul 17, 4:14 PM EDT	Special Weather Statement	CTP	Dauphin	31 min
Jul 17, 4:14 PM EDT	Special Weather Statement	CTP	Tioga	46 min
Jul 17, 4:23 PM EDT	Special Weather Statement	CTP	Clinton	37 min
Jul 17, 4:24 PM EDT	Special Weather Statement	CTP	Dauphin	36 min
Jul 17, 4:32 PM EDT	Special Weather Statement	CTP	Lycoming	28 min
Jul 17, 4:34 PM EDT	Special Weather Statement	CTP	Centre	26 min
Jul 17, 4:38 PM EDT	Areal Flood Advisory	CTP	Clinton, Lycoming	2 hr
Jul 17, 4:44 PM EDT	Areal Flood Advisory	CTP	Bedford, Cumberland, Franklin, Fulton, Huntingdon, Juniata and 3 more	2 hr
Jul 17, 4:45 PM EDT	Special Weather Statement	CTP	Dauphin	30 min
Jul 17, 4:47 PM EDT	Special Weather Statement	CTP	Tioga	28 min
Jul 17, 4:50 PM EDT	Special Weather Statement	CTP	Somerset	25 min
Jul 17, 4:50 PM EDT	Severe Thunderstorm Warning	CTP	Juniata, Mifflin, Northumberland, Snyder, Union	55 min
Jul 17, 4:53 PM EDT	Areal Flood Advisory	CTP	Cameron, Elk, McKean, Potter, Warren	66 min
Jul 17, 4:56 PM EDT	Areal Flood Advisory	CTP	Columbia, Dauphin, Lycoming, Montour, Northumberland, Schuylkill and 3 more	61 min
Jul 17, 4:58 PM EDT	Special Weather Statement	CTP	Clinton	32 min
Jul 17, 5:02 PM EDT	Severe Thunderstorm Warning	CTP	Clinton, Lycoming	43 min
Jul 17, 5:08 PM EDT	Special Weather Statement	CTP	Franklin	37 min
Jul 17, 5:14 PM EDT	Flash Flood Warning Considerable damage threat	CTP	Lycoming, Sullivan	3 hr
Jul 17, 5:16 PM EDT	Special Weather Statement	CTP	Dauphin	29 min
Jul 17, 5:20 PM EDT	Areal Flood Advisory	CTP	Cumberland, Dauphin, Juniata, Lebanon, Perry	2 hr
Jul 17, 5:27 PM EDT	Special Weather Statement	CTP	Sullivan	33 min
Jul 17, 5:30 PM EDT	Special Weather Statement	CTP	Franklin	30 min
Jul 17, 5:42 PM EDT	Flash Flood Warning Considerable damage threat	CTP	Adams, Cumberland, Franklin, Fulton, Huntingdon, Perry	111 min
Jul 17, 5:44 PM EDT	Severe Thunderstorm Warning	CTP	Columbia, Cumberland, Dauphin, Juniata, Lycoming, Montour and 6 more	61 min
Jul 17, 5:56 PM EDT	Flash Flood Warning Considerable damage threat	CTP	Columbia, Cumberland, Dauphin, Juniata, Lebanon, Lycoming and 7 more	3 hr
Jul 17, 6:09 PM EDT	Severe Thunderstorm Warning	CTP	Adams, Cumberland, Dauphin, Franklin, York	36 min
Jul 17, 6:22 PM EDT	Severe Thunderstorm Warning	CTP	Columbia, Lycoming, Sullivan	28 min
Jul 17, 6:57 PM EDT	Special Weather Statement	CTP	Schuylkill	33 min
Jul 17, 7:07 PM EDT	Areal Flood Advisory	CTP	Adams, York	2 hr
Jul 17, 7:34 PM EDT	Severe Thunderstorm Warning	CTP	Adams, York	56 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.