Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 187, NWS State College, PA

July 29, 20214 counties in Pennsylvania

NWS State College, PA issued this severe thunderstorm warning at Jul 29, 2021, 1:50 PM EDT for 4 counties in Pennsylvania. It was in force for 25 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: Jul 29, 2021, 1:50 PM EDT (17:50 UTC)
Expired: Jul 29, 2021, 2:15 PM EDT
In force: 25 min
Issued by: NWS State College, PA
Area: Storm-based polygon
Tornado: Possible
Hail: 0.75 in
Wind: 60.0 mph

Counties Blair County, PA, Cambria County, PA, Centre County, PA, Clearfield County, PA

The radar

The State College radar (KCCX), 37 km from the middle of the area, began a volume at 17:52 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
Jul 29, 1:53 PM EDT	TSTM WND DMG	3 Se Glen Hope, PA	TREES ON WIRES.

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, 5.8 hours before the alert went out and 155 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: 136 J/kg
Mixed-layer CIN: -76 J/kg
Mixed-layer LCL: 1222 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 175 m²/s²
0-3 km storm-relative helicity: 213 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

Open this sounding in Storm Lab

The text

As transmitted.

170 
WUUS51 KCTP 291750
SVRCTP
PAC013-021-027-033-291815-
/O.NEW.KCTP.SV.W.0187.210729T1750Z-210729T1815Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service State College PA
150 PM EDT Thu Jul 29 2021

The National Weather Service in State College PA has issued a

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

* Until 215 PM EDT.

* At 150 PM EDT, a severe thunderstorm was located over Prince
  Gallitzin State Park, moving east at 35 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Tyrone, Bald Eagle, Tipton, Blandburg, Prince Gallitzin State Park,
  Coalport and Delgrosso's Amusement Park.

This includes Interstate 99 from mile markers 43 to 52.

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 this storm. 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 4076 7861 4080 7818 4071 7817 4069 7822
      4067 7822 4064 7820 4062 7817 4061 7817
      4060 7818 4067 7862
TIME...MOT...LOC 1750Z 276DEG 31KT 4070 7855 

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

Banghoff

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 29, 8:28 AM EDT	Special Weather Statement	CTP	Warren	47 min
Jul 29, 10:05 AM EDT	Special Weather Statement	CTP	Elk	25 min
Jul 29, 10:47 AM EDT	Special Weather Statement	CTP	Warren	43 min
Jul 29, 1:12 PM EDT	Special Weather Statement	CTP	Clearfield	33 min
Jul 29, 2:13 PM EDT	Tornado Warning	CTP	Somerset	32 min
Jul 29, 2:14 PM EDT	Severe Thunderstorm Warning	CTP	Blair, Centre, Huntingdon	46 min
Jul 29, 2:22 PM EDT	Special Weather Statement	CTP	Centre	23 min
Jul 29, 2:58 PM EDT	Special Weather Statement	CTP	Mifflin	32 min
Jul 29, 3:50 PM EDT	Special Weather Statement	CTP	Juniata, Perry	25 min
Jul 29, 5:26 PM EDT	Special Weather Statement	CTP	Cambria	34 min
Jul 29, 6:08 PM EDT	Special Weather Statement	CTP	Lancaster	52 min
Jul 29, 6:24 PM EDT	Severe Thunderstorm Warning	CTP	Bedford, Blair, Cambria	12 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.