Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 211, NWS State College, PA

August 12, 2021Warren County, Pennsylvania

NWS State College, PA issued this severe thunderstorm warning at Aug 12, 2021, 5:12 PM EDT for Warren County, Pennsylvania. It was in force for 48 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, 5:12 PM EDT (21:12 UTC)
Expired: Aug 12, 2021, 6:00 PM EDT
In force: 48 min
Issued by: NWS State College, PA
Area: Storm-based polygon
Hail: 0.88 in
Wind: 60.0 mph

County Warren County, PA

The radar

The Buffalo radar (KBUF), 147 km from the middle of the area, began a volume at 21:15 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 nearest sounding before it

Buffalo Intl Airport, NY (KBUF), launched 12:00Z, 9.2 hours before the alert went out and 147 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: 390 J/kg
Mixed-layer CIN: -48 J/kg
Mixed-layer LCL: 843 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 55 m²/s²
0-3 km storm-relative helicity: 87 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

382 
WUUS51 KCTP 122112
SVRCTP
PAC123-122200-
/O.NEW.KCTP.SV.W.0211.210812T2112Z-210812T2200Z/

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

The National Weather Service in State College PA has issued a

* Severe Thunderstorm Warning for...
  Southwestern Warren County in north central Pennsylvania...

* Until 600 PM EDT.

* At 512 PM EDT, a severe thunderstorm was located near Titusville,
  moving northeast at 25 mph.

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

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Enterprise, Garland, Grand Valley and Tidioute. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4179 7961 4191 7939 4163 7928 4162 7961
TIME...MOT...LOC 2112Z 242DEG 23KT 4163 7974 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.88 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Banghoff

1 follow-up statement

392 
WWUS51 KCTP 122155
SVSCTP

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

PAC123-122205-
/O.EXP.KCTP.SV.W.0211.000000T0000Z-210812T2200Z/
Warren PA-
555 PM EDT Thu Aug 12 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN WARREN COUNTY
WILL EXPIRE AT 600 PM EDT...
                
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 will be allowed to expire.

LAT...LON 4179 7961 4191 7939 4163 7928 4162 7961
TIME...MOT...LOC 2155Z 242DEG 23KT 4176 7942 

$$

Banghoff

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, 1:43 PM EDT	Severe Thunderstorm Warning	CTP	Clearfield	49 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, 5:27 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.