Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 50, NWS State College, PA

June 21, 2021Adams County, Franklin County, Pennsylvania

NWS State College, PA issued this severe thunderstorm warning at Jun 21, 2021, 4:31 PM EDT for Adams County, Franklin County, Pennsylvania. It was in force for 59 min. 4 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: Jun 21, 2021, 4:31 PM EDT (20:31 UTC)
Expired: Jun 21, 2021, 5:30 PM EDT
In force: 59 min
Issued by: NWS State College, PA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Adams County, PA, Franklin County, PA

The radar

The Sterling radar (KLWX), 101 km from the middle of the area, began a volume at 20:30 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
Jun 21, 4:45 PM EDT	TSTM WND DMG	3 Wnw Waynesboro, PA	MANY TREES DOWN ON ROADS FROM WAYNESBORO TO GREENCASTLE.
Jun 21, 4:48 PM EDT	TSTM WND DMG	4 Nw Fairfield, PA	MULTIPLE LARGE TREES DOWN ON PROPERTY OFF MORITZ RD NEAR ORRTANNA.
Jun 21, 4:50 PM EDT	TSTM WND DMG	1 Wsw Waynesboro, PA	MULTIPLE TREES DOWN.
Jun 21, 5:00 PM EDT	TSTM WND DMG	1 W Cashtown, PA	WIDESPREAD TREES DOWN FROM CASHTOWN TO FAIRFIELD.

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
Jun 21, 2:20 PM EDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 8.5 hours before the alert went out and 104 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: 329 J/kg
Mixed-layer CIN: -164 J/kg
Mixed-layer LCL: 801 m above ground
0-6 km bulk shear: 11 kt
0-1 km storm-relative helicity: 33 m²/s²
0-3 km storm-relative helicity: 40 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

955 
WUUS51 KCTP 212031
SVRCTP
PAC001-055-212130-
/O.NEW.KCTP.SV.W.0050.210621T2031Z-210621T2130Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service State College PA
431 PM EDT Mon Jun 21 2021

The National Weather Service in State College PA has issued a

* Severe Thunderstorm Warning for...
  Western Adams County in south central Pennsylvania...
  Southeastern Franklin County in south central Pennsylvania...

* Until 530 PM EDT.

* At 431 PM EDT, a severe thunderstorm was located over Marion,
  moving east at 30 mph.

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

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees.

* Locations impacted include...
  Chambersburg, Waynesboro, Gettysburg, Greencastle, Guilford,
  Carroll Valley, Fayetteville, Wayne Heights, Mont Alto, Lake
  Heritage, Rouzerville, Marion, Cashtown, Aspers, Orrtanna, State
  Line, Biglerville, Arendtsville, Bendersville and Fairfield.

This includes Interstate 81 from mile markers 1 to 15.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3973 7786 3988 7782 3998 7746 3995 7747
      3995 7746 3999 7741 4003 7718 3972 7716
TIME...MOT...LOC 2031Z 259DEG 24KT 3985 7766 

HAIL...1.00IN
WIND...60MPH
 
$$

Banghoff

1 follow-up statement

112 
WWUS51 KCTP 212107
SVSCTP

Severe Weather Statement
National Weather Service State College PA
507 PM EDT Mon Jun 21 2021

PAC055-212117-
/O.CAN.KCTP.SV.W.0050.000000T0000Z-210621T2130Z/
Franklin PA-
507 PM EDT Mon Jun 21 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN FRANKLIN COUNTY
IS CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

A Severe Thunderstorm Watch remains in effect until 1000 PM EDT for
south central Pennsylvania.

LAT...LON 3972 7746 3983 7746 3984 7747 3994 7747
      3999 7741 4003 7718 3972 7716
TIME...MOT...LOC 2107Z 259DEG 24KT 3990 7735 

$$

PAC001-212130-
/O.CON.KCTP.SV.W.0050.000000T0000Z-210621T2130Z/
Adams PA-
507 PM EDT Mon Jun 21 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 PM EDT
FOR WESTERN ADAMS COUNTY...

At 507 PM EDT, a severe thunderstorm was located over Cashtown,
moving east at 30 mph.

HAZARD...70 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect considerable 
         tree damage. Wind damage is also likely to mobile homes, 
         roofs, and outbuildings.

Locations impacted include...
Gettysburg, Carroll Valley, Lake Heritage, Cashtown, Aspers,
Orrtanna, Biglerville, Arendtsville, Bendersville, Fairfield,
McKnightstown, Idaville, Gardners, Two Taverns, Gettysburg National
Military Park, Liberty Mountain Resort and Gettysburg College.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3972 7746 3983 7746 3984 7747 3994 7747
      3999 7741 4003 7718 3972 7716
TIME...MOT...LOC 2107Z 259DEG 24KT 3990 7735 

HAIL...1.00IN
WIND...70MPH
 
$$

Banghoff

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 20, 8:03 PM EDT	Special Weather Statement	CTP	Juniata	12 min
Jun 20, 8:13 PM EDT	Severe Thunderstorm Warning	CTP	Juniata, Snyder	24 min
Jun 20, 8:29 PM EDT	Special Weather Statement	CTP	Dauphin	16 min
Jun 20, 8:35 PM EDT	Special Weather Statement	CTP	McKean	25 min
Jun 20, 8:47 PM EDT	Special Weather Statement	CTP	Dauphin	13 min
Jun 20, 9:02 PM EDT	Special Weather Statement	CTP	Dauphin	13 min
Jun 20, 9:16 PM EDT	Special Weather Statement	CTP	Schuylkill	14 min
Jun 20, 9:23 PM EDT	Severe Thunderstorm Warning	CTP	Columbia, Northumberland, Schuylkill	50 min
Jun 20, 9:29 PM EDT	Areal Flood Advisory	CTP	Lebanon, Schuylkill	2 hr
Jun 21, 4:18 AM EDT	Special Weather Statement	CTP	Warren	42 min
Jun 21, 2:19 PM EDT	Special Weather Statement	CTP	Warren	41 min
Jun 21, 2:43 PM EDT	Severe Thunderstorm Warning	CTP	McKean, Warren	47 min
Jun 21, 2:55 PM EDT	Special Weather Statement	CTP	McKean	35 min
Jun 21, 3:09 PM EDT	Severe Thunderstorm Warning	CTP	McKean, Potter	21 min
Jun 21, 3:14 PM EDT	Severe Thunderstorm Warning	CTP	McKean	31 min
Jun 21, 3:20 PM EDT	Special Weather Statement	CTP	Clearfield	25 min
Jun 21, 3:26 PM EDT	Severe Thunderstorm Warning	CTP	Cameron, Elk, McKean, Warren	49 min
Jun 21, 3:35 PM EDT	Special Weather Statement	CTP	Centre	25 min
Jun 21, 3:55 PM EDT	Special Weather Statement	CTP	Tioga	35 min
Jun 21, 3:58 PM EDT	Special Weather Statement	CTP	Snyder	32 min
Jun 21, 4:15 PM EDT	Special Weather Statement	CTP	Cameron, Potter	45 min
Jun 21, 4:17 PM EDT	Special Weather Statement	CTP	Cambria	28 min
Jun 21, 4:18 PM EDT	Special Weather Statement	CTP	Sullivan	27 min
Jun 21, 4:18 PM EDT	Special Weather Statement	CTP	Franklin	27 min
Jun 21, 4:21 PM EDT	Special Weather Statement	CTP	Union	24 min
Jun 21, 4:24 PM EDT	Special Weather Statement	CTP	Centre	21 min
Jun 21, 4:28 PM EDT	Severe Thunderstorm Warning	CTP	Cambria	47 min
Jun 21, 4:31 PM EDT	Special Weather Statement	CTP	Lycoming	44 min
Jun 21, 4:39 PM EDT	Severe Thunderstorm Warning	CTP	Cambria, Somerset	36 min
Jun 21, 4:43 PM EDT	Severe Thunderstorm Warning	CTP	Centre	32 min
Jun 21, 4:45 PM EDT	Severe Thunderstorm Warning	CTP	Lycoming, Sullivan, Tioga	30 min
Jun 21, 4:52 PM EDT	Special Weather Statement	CTP	Clinton	23 min
Jun 21, 4:55 PM EDT	Special Weather Statement	CTP	Blair	20 min
Jun 21, 4:56 PM EDT	Special Weather Statement	CTP	Sullivan	19 min
Jun 21, 5:05 PM EDT	Severe Thunderstorm Warning	CTP	Adams, Cumberland, York	40 min
Jun 21, 5:08 PM EDT	Severe Thunderstorm Warning	CTP	Centre, Clinton, Lycoming	37 min
Jun 21, 5:13 PM EDT	Special Weather Statement	CTP	Bedford, Blair	32 min
Jun 21, 5:31 PM EDT	Severe Thunderstorm Warning	CTP	Lycoming, Sullivan, Tioga	44 min
Jun 21, 5:41 PM EDT	Severe Thunderstorm Warning	CTP	York	34 min
Jun 21, 5:45 PM EDT	Special Weather Statement	CTP	Montour	45 min
Jun 21, 5:52 PM EDT	Special Weather Statement	CTP	Columbia, Northumberland	23 min
Jun 21, 5:58 PM EDT	Severe Thunderstorm Warning	CTP	Lancaster	47 min
Jun 21, 6:02 PM EDT	Special Weather Statement	CTP	Dauphin	28 min
Jun 21, 6:08 PM EDT	Special Weather Statement	CTP	Sullivan	37 min
Jun 21, 6:15 PM EDT	Severe Thunderstorm Warning	CTP	Sullivan	15 min
Jun 21, 6:20 PM EDT	Special Weather Statement	CTP	Schuylkill	25 min
Jun 21, 6:23 PM EDT	Special Weather Statement	CTP	Schuylkill	37 min
Jun 21, 6:49 PM EDT	Special Weather Statement	CTP	Schuylkill	26 min
Jun 21, 7:00 PM EDT	Special Weather Statement	CTP	Somerset	15 min
Jun 21, 7:12 PM EDT	Special Weather Statement	CTP	Carbon	18 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.