Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 259, NWS State College, PA

August 28, 20214 counties in Pennsylvania

NWS State College, PA issued this severe thunderstorm warning at Aug 28, 2021, 2:15 PM EDT for 4 counties in Pennsylvania. It was in force for 30 min. 1 report 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 28, 2021, 2:15 PM EDT (18:15 UTC)
Expired: Aug 28, 2021, 2:45 PM EDT
In force: 30 min
Issued by: NWS State College, PA
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Blair County, PA, Centre County, PA, Clearfield County, PA, Huntingdon County, PA

The radar

The State College radar (KCCX), 28 km from the middle of the area, began a volume at 18:17 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 28, 2:25 PM EDT	TSTM WND DMG	1 Nnw Brisbin, PA	MULTIPLE TREES DOWN BLOCKING ROADWAY.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Pittsburgh, PA (KPIT), launched 12:00Z, 6.3 hours before the alert went out and 158 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: 973 J/kg
Mixed-layer CIN: -42 J/kg
Mixed-layer LCL: 1008 m above ground
0-6 km bulk shear: 10 kt
0-1 km storm-relative helicity: 26 m²/s²
0-3 km storm-relative helicity: 46 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

873 
WUUS51 KCTP 281815
SVRCTP
PAC013-027-033-061-281845-
/O.NEW.KCTP.SV.W.0259.210828T1815Z-210828T1845Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service State College PA
215 PM EDT Sat Aug 28 2021

The National Weather Service in State College PA has issued a

* Severe Thunderstorm Warning for...
  South central Clearfield County in central Pennsylvania...
  Northwestern Huntingdon County in central Pennsylvania...
  Southwestern Centre County in central Pennsylvania...
  Northeastern Blair County in central Pennsylvania...

* Until 245 PM EDT.

* At 214 PM EDT, a severe thunderstorm was located over Houtzdale,
  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...
  Tyrone, Stormstown, Bald Eagle, Warriors Mark, Osceola Mills,
  Houtzdale, Port Matilda, Sandy Ridge, Franklinville, Ramey, Brisbin
  and Glen Hope.

This includes Interstate 99 from mile markers 49 to 66.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4088 7847 4084 7797 4064 7809 4077 7850
TIME...MOT...LOC 1814Z 280DEG 33KT 4081 7840 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Travis

2 follow-up statements

268 
WWUS51 KCTP 281832
SVSCTP

Severe Weather Statement
National Weather Service State College PA
232 PM EDT Sat Aug 28 2021

PAC033-281841-
/O.CAN.KCTP.SV.W.0259.000000T0000Z-210828T1845Z/
Clearfield PA-
232 PM EDT Sat Aug 28 2021

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

LAT...LON 4072 7834 4073 7836 4075 7837 4076 7837
      4078 7834 4080 7834 4082 7830 4084 7830
      4085 7829 4083 7797 4064 7809
TIME...MOT...LOC 1831Z 280DEG 33KT 4078 7820 

$$

PAC013-027-061-281845-
/O.CON.KCTP.SV.W.0259.000000T0000Z-210828T1845Z/
Huntingdon PA-Centre PA-Blair PA-
232 PM EDT Sat Aug 28 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 245 PM EDT
FOR NORTHWESTERN HUNTINGDON...SOUTHWESTERN CENTRE AND NORTHEASTERN
BLAIR COUNTIES...

At 231 PM EDT, a severe thunderstorm was located just west of Sandy 
Ridge, moving east at 30 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
Tyrone, Stormstown, Bald Eagle, Warriors Mark, Osceola Mills, Port
Matilda, Sandy Ridge and Franklinville.

This includes Interstate 99 from mile markers 49 to 66.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4072 7834 4073 7836 4075 7837 4076 7837
      4078 7834 4080 7834 4082 7830 4084 7830
      4085 7829 4083 7797 4064 7809
TIME...MOT...LOC 1831Z 280DEG 33KT 4078 7820 

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

$$

Travis

859 
WWUS51 KCTP 281844
SVSCTP

Severe Weather Statement
National Weather Service State College PA
244 PM EDT Sat Aug 28 2021

PAC013-027-061-281853-
/O.EXP.KCTP.SV.W.0259.000000T0000Z-210828T1845Z/
Huntingdon PA-Centre PA-Blair PA-
244 PM EDT Sat Aug 28 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN HUNTINGDON...
SOUTHWESTERN CENTRE AND NORTHEASTERN BLAIR COUNTIES WILL EXPIRE AT
245 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 4072 7834 4073 7836 4075 7837 4076 7837
      4078 7834 4080 7834 4082 7830 4084 7830
      4085 7829 4083 7797 4064 7809
TIME...MOT...LOC 1843Z 280DEG 33KT 4076 7808 

$$

Travis

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 27, 8:44 PM EDT	Areal Flood Advisory	CTP	Sullivan	3 hr
Aug 27, 8:54 PM EDT	Areal Flood Advisory	CTP	Lycoming, Sullivan	2 hr
Aug 28, 12:57 AM EDT	Areal Flood Advisory	CTP	Lancaster, Lebanon	2 hr
Aug 28, 1:11 PM EDT	Special Weather Statement	CTP	Bedford	34 min
Aug 28, 2:53 PM EDT	Areal Flood Advisory	CTP	Bedford	83 min
Aug 28, 4:04 PM EDT	Special Weather Statement	CTP	McKean	26 min
Aug 28, 4:19 PM EDT	Special Weather Statement	CTP	Franklin	26 min
Aug 28, 4:47 PM EDT	Special Weather Statement	CTP	Clinton	13 min
Aug 28, 4:49 PM EDT	Special Weather Statement	CTP	Franklin	26 min
Aug 28, 5:29 PM EDT	Areal Flood Advisory	CTP	Bedford, Cambria, Somerset	44 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.