Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 220, NWS State College, PA

August 12, 20215 counties in Pennsylvania

NWS State College, PA issued this severe thunderstorm warning at Aug 12, 2021, 9:23 PM EDT for 5 counties in Pennsylvania. It was in force for 67 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: Aug 12, 2021, 9:23 PM EDT (01:23 UTC)
Expired: Aug 12, 2021, 10:30 PM EDT
In force: 67 min
Issued by: NWS State College, PA
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

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

The radar

The State College radar (KCCX), 115 km from the middle of the area, began a volume at 01:23 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
Aug 12, 9:25 PM EDT	TSTM WND DMG	Kissimmee, PA	TREES AND WIRES DOWN
Aug 12, 9:33 PM EDT	TSTM WND DMG	2 Nw Cambra, PA	TREES AND POWER LINES DOWN UPPER RAVEN CREEK RD. BENTON TWP.

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
Aug 12, 1:11 PM EDT	Severe Thunderstorm Watch	SPC	9 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 00:00Z, 1.4 hours before the alert went out and 242 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: 2808 J/kg
Mixed-layer CIN: -24 J/kg
Mixed-layer LCL: 1565 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: 38 m²/s²
0-3 km storm-relative helicity: 153 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 4.9

Open this sounding in Storm Lab

The text

As transmitted.

565 
WUUS51 KCTP 130123
SVRCTP
PAC037-093-097-109-119-130230-
/O.NEW.KCTP.SV.W.0220.210813T0123Z-210813T0230Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service State College PA
923 PM EDT Thu Aug 12 2021

The National Weather Service in State College PA has issued a

* Severe Thunderstorm Warning for...
  Northern Northumberland County in central Pennsylvania...
  Snyder County in central Pennsylvania...
  Montour County in central Pennsylvania...
  Columbia County in central Pennsylvania...
  Southeastern Union County in central Pennsylvania...

* Until 1030 PM EDT.

* At 922 PM EDT, severe thunderstorms were located along a line
  extending from Allenwood to Kreamer, moving east at 45 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Bloomsburg, Berwick, Sunbury, Milton, Lewisburg, Selinsgrove,
  Danville, Northumberland, Winfield, Watsontown, Elysburg,
  Riverside, Shamokin Dam, Catawissa, Linntown, Hummels Wharf,
  Middleburg, Mifflinville, Lightstreet and Almedia.

For those driving on Interstate 80, this includes areas between the
Mile Run and Nescopek exits, specifically from mile markers 208 to
247.

This includes Interstate 180 from mile markers 1 to 3.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Large hail and damaging winds and continuous cloud to ground
lightning is occurring with these storms. Move indoors immediately.
Lightning is one of nature's leading killers. Remember, if you can
hear thunder, you are close enough to be struck by lightning.

&&

LAT...LON 4068 7710 4069 7720 4086 7718 4090 7700
      4105 7699 4120 7645 4125 7648 4129 7643
      4131 7641 4131 7631 4120 7632 4113 7627
      4114 7623 4097 7621
TIME...MOT...LOC 0122Z 248DEG 38KT 4112 7692 4081 7695 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Banghoff

2 follow-up statements

968 
WWUS51 KCTP 130202
SVSCTP

Severe Weather Statement
National Weather Service State College PA
1002 PM EDT Thu Aug 12 2021

PAC109-119-130211-
/O.CAN.KCTP.SV.W.0220.000000T0000Z-210813T0230Z/
Snyder PA-Union PA-
1002 PM EDT Thu Aug 12 2021

...THE SEVERE THUNDERSTORM WARNING FOR SNYDER AND SOUTHEASTERN UNION
COUNTIES IS CANCELLED...

The storms which prompted the warning have moved out of the warned 
area. Therefore, the warning has been cancelled.

LAT...LON 4077 7682 4111 7677 4120 7646 4121 7645
      4125 7648 4129 7643 4131 7641 4131 7631
      4120 7632 4113 7627 4113 7623 4103 7623
      4097 7621
TIME...MOT...LOC 0201Z 257DEG 31KT 4114 7650 4083 7653 

$$

PAC037-093-097-130230-
/O.CON.KCTP.SV.W.0220.000000T0000Z-210813T0230Z/
Northumberland PA-Montour PA-Columbia PA-
1002 PM EDT Thu Aug 12 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1030 PM EDT
FOR CENTRAL NORTHUMBERLAND...MONTOUR AND COLUMBIA COUNTIES...

At 1001 PM EDT, severe thunderstorms were located along a line
extending from Iola to near Elysburg, moving east at 35 mph.

HAZARD...60 mph wind gusts.

SOURCE...Law enforcement.

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

Locations impacted include...
Bloomsburg, Berwick, Sunbury, Danville, Northumberland, Elysburg,
Riverside, Catawissa, Mifflinville, Lightstreet, Almedia, Fernville,
Mechanicsville, Buckhorn, Jerseytown, Rupert, Slabtown, Rohrsburg,
Iola and Jamison City.

For those driving on Interstate 80, this includes areas between the
Limestoneville and Nescopek exits, specifically from mile markers 216
to 247.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

This is a DANGEROUS SITUATION. These storms are producing widespread 
wind damage across Union, Snyder, Northumberland And Montour 
Counties. SEEK SHELTER NOW inside a sturdy structure and stay away 
from windows.
 
Continuous cloud to ground lightning is occurring with these storms.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.

&&

LAT...LON 4077 7682 4111 7677 4120 7646 4121 7645
      4125 7648 4129 7643 4131 7641 4131 7631
      4120 7632 4113 7627 4113 7623 4103 7623
      4097 7621
TIME...MOT...LOC 0201Z 257DEG 31KT 4114 7650 4083 7653 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Banghoff

277 
WWUS51 KCTP 130221
SVSCTP

Severe Weather Statement
National Weather Service State College PA
1021 PM EDT Thu Aug 12 2021

PAC037-093-097-130230-
/O.EXP.KCTP.SV.W.0220.000000T0000Z-210813T0230Z/
Northumberland PA-Montour PA-Columbia PA-
1021 PM EDT Thu Aug 12 2021

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL NORTHUMBERLAND...
MONTOUR AND COLUMBIA COUNTIES WILL EXPIRE AT 1030 PM EDT...
    
The storms which prompted the warning have weakened below severe
limits, and have exited the warned area. Therefore, the warning will
be allowed to expire.

Remember, a Severe Thunderstorm Warning still remains in effect for
southern Columbia County and southeast Northumberland County.

LAT...LON 4077 7682 4111 7677 4120 7646 4121 7645
      4125 7648 4129 7643 4131 7641 4131 7631
      4120 7632 4113 7627 4113 7623 4103 7623
      4097 7621
TIME...MOT...LOC 0220Z 248DEG 38KT 4121 7626 4090 7629 

$$

Banghoff

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 12, 8:05 PM EDT	Severe Thunderstorm Warning	CTP	Clinton, Lycoming, Sullivan, Tioga	40 min
Aug 12, 8:16 PM EDT	Special Weather Statement	CTP	Blair, Huntingdon, Mifflin	29 min
Aug 12, 8:28 PM EDT	Severe Thunderstorm Warning	CTP	Lycoming, Sullivan	47 min
Aug 12, 8:33 PM EDT	Special Weather Statement	CTP	Union	12 min
Aug 12, 8:42 PM EDT	Severe Thunderstorm Warning	CTP	Centre, Clinton, Lycoming, Mifflin, Union	48 min
Aug 12, 8:46 PM EDT	Special Weather Statement	CTP	Juniata, Mifflin, Perry, Snyder	29 min
Aug 12, 9:01 PM EDT	Severe Thunderstorm Warning	CTP	Columbia, Lycoming, Montour, Northumberland, Union	44 min
Aug 12, 9:14 PM EDT	Special Weather Statement	CTP	Sullivan	31 min
Aug 12, 9:25 PM EDT	Special Weather Statement	CTP	Perry	20 min
Aug 12, 9:44 PM EDT	Special Weather Statement	CTP	Dauphin	31 min
Aug 12, 9:59 PM EDT	Severe Thunderstorm Warning	CTP	Columbia, Dauphin, Lebanon, Northumberland, Perry, Schuylkill	31 min
Aug 12, 10:31 PM EDT	Severe Thunderstorm Warning	CTP	Columbia, Dauphin, Lebanon, Northumberland, Schuylkill	59 min
Aug 12, 10:34 PM EDT	Special Weather Statement	CTP	Lebanon	26 min
Aug 12, 11:03 PM EDT	Special Weather Statement	CTP	Lebanon	27 min
Aug 12, 11:10 PM EDT	Severe Thunderstorm Warning	CTP	Dauphin, Lancaster, Lebanon, York	34 min
Aug 13, 1:49 PM EDT	Special Weather Statement	CTP	Cumberland, Franklin, Perry	41 min
Aug 13, 1:59 PM EDT	Special Weather Statement	CTP	Fulton	31 min
Aug 13, 2:12 PM EDT	Severe Thunderstorm Warning	CTP	Adams, Cumberland, Franklin, Fulton, Huntingdon, Juniata and 2 more	63 min
Aug 13, 2:17 PM EDT	Special Weather Statement	CTP	Cameron	28 min
Aug 13, 2:22 PM EDT	Special Weather Statement	CTP	Potter	38 min
Aug 13, 2:35 PM EDT	Special Weather Statement	CTP	Clinton	25 min
Aug 13, 2:59 PM EDT	Special Weather Statement	CTP	Clinton	31 min
Aug 13, 3:00 PM EDT	Special Weather Statement	CTP	Potter	30 min
Aug 13, 3:04 PM EDT	Special Weather Statement	CTP	Potter	26 min
Aug 13, 3:12 PM EDT	Severe Thunderstorm Warning	CTP	Adams, Franklin	63 min
Aug 13, 3:14 PM EDT	Severe Thunderstorm Warning	CTP	Cumberland, Perry	61 min
Aug 13, 3:22 PM EDT	Severe Thunderstorm Warning	CTP	Clinton, Lycoming	38 min
Aug 13, 3:26 PM EDT	Special Weather Statement	CTP	Dauphin	34 min
Aug 13, 3:35 PM EDT	Severe Thunderstorm Warning	CTP	York	40 min
Aug 13, 3:43 PM EDT	Severe Thunderstorm Warning	CTP	Dauphin, Juniata, Northumberland, Perry, Snyder	29 min
Aug 13, 3:43 PM EDT	Severe Thunderstorm Warning	CTP	Cumberland, Dauphin, Perry	47 min
Aug 13, 3:56 PM EDT	Areal Flood Advisory	CTP	Adams, Cumberland, Dauphin, Perry, York	2 hr
Aug 13, 3:57 PM EDT	Special Weather Statement	CTP	Lycoming	33 min
Aug 13, 4:07 PM EDT	Severe Thunderstorm Warning	CTP	Adams, Dauphin, Lancaster, Lebanon, York	53 min
Aug 13, 4:20 PM EDT	Special Weather Statement	CTP	Sullivan	25 min
Aug 13, 4:30 PM EDT	Severe Thunderstorm Warning	CTP	Columbia, Lycoming, Sullivan	60 min
Aug 13, 4:41 PM EDT	Special Weather Statement	CTP	Clinton	34 min
Aug 13, 4:59 PM EDT	Special Weather Statement	CTP	York	46 min
Aug 13, 5:14 PM EDT	Special Weather Statement	CTP	Montour	16 min
Aug 13, 5:29 PM EDT	Severe Thunderstorm Warning	CTP	Columbia, Lycoming, Sullivan	31 min
Aug 13, 5:38 PM EDT	Special Weather Statement	CTP	Snyder, Union	37 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.