Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 209, NWS State College, PA

August 12, 2021Clearfield County, Pennsylvania

NWS State College, PA issued this severe thunderstorm warning at Aug 12, 2021, 1:43 PM EDT for Clearfield County, Pennsylvania. It was in force for 49 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Aug 12, 2021, 1:43 PM EDT (17:43 UTC)
Expired: Aug 12, 2021, 2:32 PM EDT
In force: 49 min
Issued by: NWS State College, PA
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

County Clearfield County, PA

The radar

The State College radar (KCCX), 34 km from the middle of the area, began a volume at 17:47 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.

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

Pittsburgh, PA (KPIT), launched 12:00Z, 5.7 hours before the alert went out and 153 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: 1075 J/kg
Mixed-layer CIN: -107 J/kg
Mixed-layer LCL: 890 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 163 m²/s²
0-3 km storm-relative helicity: 129 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.8

Open this sounding in Storm Lab

The text

As transmitted.

345 
WUUS51 KCTP 121743
SVRCTP
PAC033-121900-
/O.NEW.KCTP.SV.W.0209.210812T1743Z-210812T1900Z/

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

The National Weather Service in State College PA has issued a

* Severe Thunderstorm Warning for...
  Clearfield County in central Pennsylvania...

* Until 300 PM EDT.

* At 142 PM EDT, a severe thunderstorm was located near Punxsutawney,
  moving east at 35 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Clearfield, Philipsburg, Woodland, Curwensville, Hyde, Osceola
  Mills, Plymptonville, Chester Hill, Houtzdale, Jeffries,
  Morrisdale, Irvona, West Decatur, Coalport, Ramey, Brisbin,
  Westover, Mahaffey, Grampian and Kylertown.

For those driving on Interstate 80, this includes areas between the
Penfield and Snow Shoe exits, specifically from mile markers 113 to
134.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4104 7879 4110 7845 4105 7812 4096 7815
      4096 7817 4092 7818 4091 7822 4086 7825
      4084 7829 4082 7830 4076 7837 4073 7837
      4072 7878 4073 7881
TIME...MOT...LOC 1742Z 277DEG 31KT 4091 7891 

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

$$

Colbert

1 follow-up statement

043 
WWUS51 KCTP 121832
SVSCTP

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

PAC033-121842-
/O.CAN.KCTP.SV.W.0209.000000T0000Z-210812T1900Z/
Clearfield PA-
232 PM EDT Thu Aug 12 2021

...THE SEVERE THUNDERSTORM WARNING FOR CLEARFIELD COUNTY IS
CANCELLED...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning has been cancelled.

A Severe Thunderstorm Watch remains in effect until 800 PM EDT for
central Pennsylvania.

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
State College PA.

LAT...LON 4104 7879 4110 7845 4105 7812 4096 7815
      4096 7817 4092 7818 4091 7822 4086 7825
      4084 7829 4082 7830 4076 7837 4073 7837
      4072 7878 4073 7881
TIME...MOT...LOC 1830Z 277DEG 31KT 4086 7834 

$$

Colbert

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 12, 3:33 AM EDT	Excessive Heat Warning	CTP	Adams, Dauphin, Lancaster, Lebanon, York	39 hr
Aug 12, 3:33 AM EDT	Heat Advisory	CTP	Columbia, Cumberland, Franklin, Fulton, Huntingdon, Juniata and 8 more	39 hr
Aug 12, 12:38 PM EDT	Special Weather Statement	CTP	Tioga	52 min
Aug 12, 12:51 PM EDT	Severe Thunderstorm Warning	CTP	Clinton, Lycoming, Potter, Tioga	54 min
Aug 12, 1:27 PM EDT	Severe Thunderstorm Warning	CTP	Lycoming, Sullivan	63 min
Aug 12, 1:47 PM EDT	Severe Thunderstorm Warning	CTP	Clinton, Lycoming	58 min
Aug 12, 2:15 PM EDT	Special Weather Statement	CTP	Columbia	30 min
Aug 12, 2:25 PM EDT	Special Weather Statement	CTP	Lycoming	20 min
Aug 12, 2:50 PM EDT	Special Weather Statement	CTP	Columbia, Montour	25 min
Aug 12, 3:19 PM EDT	Special Weather Statement	CTP	Schuylkill	41 min
Aug 12, 5:12 PM EDT	Severe Thunderstorm Warning	CTP	Warren	48 min
Aug 12, 5:27 PM EDT	Special Weather Statement	CTP	Tioga	33 min
Aug 12, 5:46 PM EDT	Severe Thunderstorm Warning	CTP	Clearfield, Elk	44 min
Aug 12, 6:25 PM EDT	Areal Flood Advisory	CTP	Clearfield, Elk	2 hr
Aug 12, 6:25 PM EDT	Severe Thunderstorm Warning	CTP	Clearfield	65 min
Aug 12, 7:07 PM EDT	Severe Thunderstorm Warning	CTP	Clearfield, Elk	53 min
Aug 12, 7:33 PM EDT	Special Weather Statement	CTP	Blair, Cambria	27 min
Aug 12, 7:47 PM EDT	Special Weather Statement	CTP	Centre	28 min
Aug 12, 7:56 PM EDT	Severe Thunderstorm Warning	CTP	Centre, Clearfield	49 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.