Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 65, NWS State College, PA

June 30, 20215 counties in Pennsylvania

NWS State College, PA issued this severe thunderstorm warning at Jun 30, 2021, 3:46 PM EDT for 5 counties in Pennsylvania. It was in force for 44 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: Jun 30, 2021, 3:46 PM EDT (19:46 UTC)
Expired: Jun 30, 2021, 4:30 PM EDT
In force: 44 min
Issued by: NWS State College, PA
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Centre County, PA, Montour County, PA, Northumberland County, PA, Snyder County, PA, Union County, PA

The radar

The State College radar (KCCX), 82 km from the middle of the area, began a volume at 19:47 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 30, 4:21 PM EDT	TSTM WND DMG	Milton, PA	ROOF BLOWN OFF BUILDING.
Jun 30, 4:26 PM EDT	TSTM WND DMG	2 Wsw Linntown, PA	OUTBUILDING DESTROYED ON FAIRSOM CT IN EAST BUFFALO 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
Jun 30, 12:46 PM EDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 7.8 hours before the alert went out and 225 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: 40 J/kg
Mixed-layer CIN: -217 J/kg
Mixed-layer LCL: 1553 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: -26 m²/s²
0-3 km storm-relative helicity: 76 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

551 
WUUS51 KCTP 301946
SVRCTP
PAC027-093-097-109-119-302030-
/O.NEW.KCTP.SV.W.0065.210630T1946Z-210630T2030Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service State College PA
346 PM EDT Wed Jun 30 2021

The National Weather Service in State College PA has issued a

* Severe Thunderstorm Warning for...
  Northwestern Northumberland County in central Pennsylvania...
  East central Centre County in central Pennsylvania...
  Northeastern Snyder County in central Pennsylvania...
  West central Montour County in central Pennsylvania...
  Union County in central Pennsylvania...

* Until 430 PM EDT.

* At 345 PM EDT, a severe thunderstorm was located over R.B. Winter
  State Park, 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...
  Sunbury, Milton, Lewisburg, Northumberland, Mifflinburg, Winfield,
  Shamokin Dam, Linntown, Hummels Wharf, New Columbia, Montandon,
  Penns Creek, Kratzerville, Vicksburg, R.B. Winter State Park,
  Forest Hill, Sand Bridge State Park, Spruce Run Reservoir,
  Laurelton Center and West Milton.

For those driving on Interstate 80, this includes areas between the
Jersey Shore and Danville exits, specifically between mile markers
195 and 198...and from mile markers 209 to 218.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4081 7678 4090 7733 4100 7730 4105 7714
      4106 7714 4106 7672
TIME...MOT...LOC 1945Z 276DEG 27KT 4099 7720 

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

Travis

1 follow-up statement

026 
WWUS51 KCTP 302016
SVSCTP

Severe Weather Statement
National Weather Service State College PA
416 PM EDT Wed Jun 30 2021

PAC027-302025-
/O.CAN.KCTP.SV.W.0065.000000T0000Z-210630T2030Z/
Centre PA-
416 PM EDT Wed Jun 30 2021

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL CENTRE 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 800 PM EDT for
central Pennsylvania.

LAT...LON 4089 7727 4095 7722 4101 7706 4106 7698
      4106 7672 4081 7678
TIME...MOT...LOC 2015Z 268DEG 36KT 4097 7696 

$$

PAC093-097-109-119-302030-
/O.CON.KCTP.SV.W.0065.000000T0000Z-210630T2030Z/
Northumberland PA-Snyder PA-Montour PA-Union PA-
416 PM EDT Wed Jun 30 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 430 PM EDT
FOR NORTHWESTERN NORTHUMBERLAND...NORTHEASTERN SNYDER...WEST CENTRAL
MONTOUR AND UNION COUNTIES...

At 415 PM EDT, a severe thunderstorm was located over Vicksburg,
moving east at 30 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
Sunbury, Milton, Lewisburg, Northumberland, Mifflinburg, Winfield,
Shamokin Dam, Linntown, Hummels Wharf, New Columbia, Montandon, Penns
Creek, Kratzerville, Vicksburg, Spruce Run Reservoir, Forest Hill,
Laurelton Center, Sand Bridge State Park, West Milton and New Berlin.

For those driving on Interstate 80, this includes areas between the
Mile Run and Danville exits, specifically from mile markers 209 to
218.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4089 7727 4095 7722 4101 7706 4106 7698
      4106 7672 4081 7678
TIME...MOT...LOC 2015Z 268DEG 36KT 4097 7696 

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

Travis

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 29, 8:56 PM EDT	Heat Advisory	CTP	Columbia, Dauphin, Lancaster, Lebanon, Lycoming, Montour and 5 more	22 hr
Jun 29, 9:10 PM EDT	Special Weather Statement	CTP	Centre	20 min
Jun 29, 9:16 PM EDT	Severe Thunderstorm Warning	CTP	McKean, Warren	89 min
Jun 29, 9:27 PM EDT	Special Weather Statement	CTP	Centre	18 min
Jun 29, 9:30 PM EDT	Severe Thunderstorm Warning	CTP	Centre	45 min
Jun 29, 10:17 PM EDT	Special Weather Statement	CTP	Sullivan	28 min
Jun 29, 10:27 PM EDT	Special Weather Statement	CTP	Potter	33 min
Jun 29, 10:42 PM EDT	Severe Thunderstorm Warning	CTP	Potter, Tioga	63 min
Jun 29, 10:59 PM EDT	Special Weather Statement	CTP	Lycoming	31 min
Jun 29, 11:23 PM EDT	Special Weather Statement	CTP	Sullivan	22 min
Jun 29, 11:38 PM EDT	Special Weather Statement	CTP	Tioga	67 min
Jun 29, 11:39 PM EDT	Special Weather Statement	CTP	Sullivan	66 min
Jun 30, 6:59 AM EDT	Special Weather Statement	CTP	McKean	46 min
Jun 30, 1:13 PM EDT	Special Weather Statement	CTP	Warren	47 min
Jun 30, 1:46 PM EDT	Special Weather Statement	CTP	Clinton	29 min
Jun 30, 1:59 PM EDT	Special Weather Statement	CTP	McKean	46 min
Jun 30, 2:14 PM EDT	Severe Thunderstorm Warning	CTP	Clinton, Lycoming	50 min
Jun 30, 2:25 PM EDT	Severe Thunderstorm Warning	CTP	Cambria	28 min
Jun 30, 3:15 PM EDT	Special Weather Statement	CTP	Cambria	45 min
Jun 30, 3:24 PM EDT	Special Weather Statement	CTP	Centre	36 min
Jun 30, 3:59 PM EDT	Special Weather Statement	CTP	Somerset	46 min
Jun 30, 4:22 PM EDT	Special Weather Statement	CTP	Juniata	38 min
Jun 30, 4:42 PM EDT	Special Weather Statement	CTP	Columbia, Montour	48 min
Jun 30, 5:05 PM EDT	Special Weather Statement	CTP	Fulton	40 min
Jun 30, 5:24 PM EDT	Severe Thunderstorm Warning	CTP	Franklin, Fulton	48 min
Jun 30, 6:10 PM EDT	Special Weather Statement	CTP	Cumberland	35 min
Jun 30, 6:27 PM EDT	Severe Thunderstorm Warning	CTP	Cumberland	48 min
Jun 30, 7:00 PM EDT	Special Weather Statement	CTP	Dauphin	15 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.