Alert archive / Pennsylvania / Tornado Warnings in 2021

Tornado Warning 8, NWS State College, PA

July 29, 2021Somerset County, Pennsylvania

NWS State College, PA issued this tornado warning at Jul 29, 2021, 2:13 PM EDT for Somerset County, Pennsylvania. It was in force for 32 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: Jul 29, 2021, 2:13 PM EDT (18:13 UTC)
Expired: Jul 29, 2021, 2:45 PM EDT
In force: 32 min
Issued by: NWS State College, PA
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

County Somerset County, PA

The radar

The Pittsburgh radar (KPBZ), 105 km from the middle of the area, began a volume at 18:15 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.

What was reported inside it

Time	Report	Where	Remark
Jul 29, 2:22 PM EDT	TSTM WND DMG	3 Ese Seven Springs, PA	WIDESPREAD TREES DOWN IN LAUREL HILL STATE PARK.
Jul 29, 2:27 PM EDT	TORNADO	3 Ese Seven Springs, PA	A TORNADO DEVELOPED WITHIN LAUREL HILL STATE PARK DURING THE AFTERNOON HOURS OF THURSDAY, JULY 29, 2021. THE TORNADO BEGAN JUST NORTH OF LAUREL HILL PARK DRIVE AND CONTINUED ON A SOUTHEAST TRACK THROUGH A PORTION OF THE PARK CONTAINING SEVERAL CONSERVATION BUI

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, 6.2 hours before the alert went out and 89 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.

331 
WFUS51 KCTP 291813
TORCTP
PAC111-291845-
/O.NEW.KCTP.TO.W.0008.210729T1813Z-210729T1845Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service State College PA
213 PM EDT Thu Jul 29 2021

The National Weather Service in State College PA has issued a

* Tornado Warning for...
  Southwestern Somerset County in south central Pennsylvania...

* Until 245 PM EDT.

* At 212 PM EDT, a severe thunderstorm capable of producing a tornado
  was located near Seven Springs, moving southeast at 25 mph.

  HAZARD...Tornado.

  SOURCE...Weather spotters reported funnel cloud.

  IMPACT...Flying debris will be dangerous to those caught without 
           shelter. Mobile homes will be damaged or destroyed. 
           Damage to roofs, windows, and vehicles will occur.  Tree 
           damage is likely.

* This dangerous storm will be near...
  Somerset and New Centerville around 240 PM EDT.

Other locations impacted by this tornadic thunderstorm include Seven
Springs and Rockwood.

This includes The Pennsylvania Turnpike from mile markers 103 to 114.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

&&

LAT...LON 4000 7932 4009 7925 4007 7897 3985 7911
TIME...MOT...LOC 1812Z 295DEG 22KT 4007 7935 

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

JCG

2 follow-up statements

715 
WWUS51 KCTP 291834
SVSCTP

Severe Weather Statement
National Weather Service State College PA
234 PM EDT Thu Jul 29 2021

PAC111-291845-
/O.CON.KCTP.TO.W.0008.000000T0000Z-210729T1845Z/
Somerset PA-
234 PM EDT Thu Jul 29 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 245 PM EDT FOR CENTRAL
SOMERSET COUNTY...
        
At 234 PM EDT, a severe thunderstorm capable of producing a tornado
was located over New Centerville, moving southeast at 35 mph.

HAZARD...Tornado.

SOURCE...Weather spotters reported a funnel cloud.

IMPACT...Flying debris will be dangerous to those caught without 
         shelter. Mobile homes will be damaged or destroyed. Damage 
         to roofs, windows, and vehicles will occur.  Tree damage is 
         likely.

This tornadic thunderstorm will remain over mainly rural areas of
central Somerset County, including the following locations...
Rockwood.

This includes The Pennsylvania Turnpike from mile markers 107 to 113.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

&&

LAT...LON 3996 7927 4005 7919 4006 7898 3985 7911
TIME...MOT...LOC 1834Z 305DEG 28KT 3997 7917 

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

JCG

925 
WWUS51 KCTP 291845
SVSCTP

Severe Weather Statement
National Weather Service State College PA
245 PM EDT Thu Jul 29 2021

PAC111-291854-
/O.EXP.KCTP.TO.W.0008.000000T0000Z-210729T1845Z/
Somerset PA-
245 PM EDT Thu Jul 29 2021

...THE TORNADO WARNING FOR CENTRAL SOMERSET COUNTY WILL EXPIRE AT 245
PM EDT...
        
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning will
be allowed to expire.

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 3996 7927 4005 7919 4006 7898 3985 7911
TIME...MOT...LOC 1844Z 295DEG 22KT 3995 7911 

$$

JCG

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, 1:50 PM EDT	Severe Thunderstorm Warning	CTP	Blair, Cambria, Centre, Clearfield	25 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

Tornado Warnings in Pennsylvania, 2021 Every tornado warning in 2021 Tornadoes 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.