Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 145, NWS State College, PA

July 13, 2021Somerset County, Pennsylvania

NWS State College, PA issued this severe thunderstorm warning at Jul 13, 2021, 6:27 PM EDT for Somerset County, Pennsylvania. It was in force for 37 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: Jul 13, 2021, 6:27 PM EDT (22:27 UTC)
Expired: Jul 13, 2021, 7:04 PM EDT
In force: 37 min
Issued by: NWS State College, PA
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

County Somerset County, PA

The radar

The Pittsburgh radar (KPBZ), 99 km from the middle of the area, began a volume at 22:27 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
Jul 13, 1:37 PM EDT	Severe Thunderstorm Watch	SPC	10 hr

The nearest sounding before it

Pittsburgh, PA (KPIT), launched 12:00Z, 10.5 hours before the alert went out and 84 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: 107 J/kg
Mixed-layer CIN: -136 J/kg
Mixed-layer LCL: 980 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 84 m²/s²
0-3 km storm-relative helicity: 158 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

Open this sounding in Storm Lab

The text

As transmitted.

572 
WUUS51 KCTP 132227
SVRCTP
PAC111-132315-
/O.NEW.KCTP.SV.W.0145.210713T2227Z-210713T2315Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service State College PA
627 PM EDT Tue Jul 13 2021

The National Weather Service in State College PA has issued a

* Severe Thunderstorm Warning for...
  Northwestern Somerset County in south central Pennsylvania...

* Until 715 PM EDT.

* At 627 PM EDT, a severe thunderstorm was located over Seven
  Springs, moving northeast at 25 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Boswell, Acosta, Jennerstown and Seven Springs. 

This includes The Pennsylvania Turnpike from mile markers 100 to 107.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4009 7926 4010 7923 4012 7921 4011 7919
      4012 7917 4016 7916 4017 7914 4018 7914
      4018 7913 4020 7913 4021 7911 4015 7893
      3991 7933 3994 7937
TIME...MOT...LOC 2227Z 223DEG 22KT 4002 7933 

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

Travis

1 follow-up statement

069 
WWUS51 KCTP 132304
SVSCTP

Severe Weather Statement
National Weather Service State College PA
704 PM EDT Tue Jul 13 2021

PAC111-132314-
/O.CAN.KCTP.SV.W.0145.000000T0000Z-210713T2315Z/
Somerset PA-
704 PM EDT Tue Jul 13 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN SOMERSET 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.  However gusty winds are
still possible with this thunderstorm.

A Severe Thunderstorm Watch remains in effect until 1100 PM EDT for
south central Pennsylvania.

LAT...LON 4009 7926 4010 7923 4012 7921 4011 7919
      4012 7917 4016 7916 4017 7914 4018 7914
      4018 7913 4020 7913 4021 7911 4015 7893
      3991 7933 3994 7937
TIME...MOT...LOC 2302Z 223DEG 22KT 4019 7913 

$$

Travis

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 12, 8:26 PM EDT	Areal Flood Advisory	CTP	Tioga	2 hr
Jul 12, 8:50 PM EDT	Areal Flood Advisory	CTP	Lycoming, Sullivan	2 hr
Jul 12, 9:47 PM EDT	Areal Flood Advisory	CTP	Sullivan	118 min
Jul 12, 11:21 PM EDT	Special Weather Statement	CTP	York	24 min
Jul 12, 11:52 PM EDT	Special Weather Statement	CTP	Adams, Lancaster, Lebanon, York	23 min
Jul 13, 12:53 AM EDT	Special Weather Statement	CTP	Lebanon	22 min
Jul 13, 1:31 AM EDT	Special Weather Statement	CTP	Schuylkill	29 min
Jul 13, 2:02 AM EDT	Special Weather Statement	CTP	Schuylkill	28 min
Jul 13, 12:39 PM EDT	Flash Flood Watch	CTP	Columbia, Lycoming, Montour, Northumberland, Snyder, Sullivan and 2 more	11 hr
Jul 13, 4:18 PM EDT	Special Weather Statement	CTP	Somerset	42 min
Jul 13, 4:31 PM EDT	Areal Flood Advisory	CTP	Tioga	119 min
Jul 13, 4:34 PM EDT	Severe Thunderstorm Warning	CTP	Somerset	41 min
Jul 13, 4:35 PM EDT	Severe Thunderstorm Warning	CTP	Warren	55 min
Jul 13, 4:38 PM EDT	Areal Flood Advisory	CTP	Somerset	3 hr
Jul 13, 5:14 PM EDT	Special Weather Statement	CTP	Somerset	46 min
Jul 13, 5:23 PM EDT	Severe Thunderstorm Warning	CTP	Elk, McKean, Warren	52 min
Jul 13, 5:35 PM EDT	Special Weather Statement	CTP	Clearfield	40 min
Jul 13, 5:38 PM EDT	Severe Thunderstorm Warning	CTP	Bedford, Somerset	41 min
Jul 13, 5:49 PM EDT	Severe Thunderstorm Warning	CTP	Cameron, Centre, Clearfield, Clinton, Potter	56 min
Jul 13, 5:53 PM EDT	Severe Thunderstorm Warning	CTP	Cameron, Clearfield, Elk	67 min
Jul 13, 5:56 PM EDT	Special Weather Statement	CTP	Clearfield	34 min
Jul 13, 6:01 PM EDT	Severe Thunderstorm Warning	CTP	Bedford, Blair, Cambria, Clearfield	59 min
Jul 13, 6:07 PM EDT	Severe Thunderstorm Warning	CTP	Clearfield, Elk	38 min
Jul 13, 6:19 PM EDT	Severe Thunderstorm Warning	CTP	McKean, Potter	41 min
Jul 13, 6:33 PM EDT	Special Weather Statement	CTP	Clearfield	27 min
Jul 13, 6:35 PM EDT	Special Weather Statement	CTP	Huntingdon	40 min
Jul 13, 6:43 PM EDT	Severe Thunderstorm Warning	CTP	Clinton, Potter, Tioga	47 min
Jul 13, 6:46 PM EDT	Severe Thunderstorm Warning	CTP	Blair, Centre, Clearfield	44 min
Jul 13, 6:46 PM EDT	Severe Thunderstorm Warning	CTP	Blair, Huntingdon	44 min
Jul 13, 6:54 PM EDT	Areal Flood Advisory	CTP	Cameron, Clearfield, Clinton	3 hr
Jul 13, 6:59 PM EDT	Severe Thunderstorm Warning	CTP	Potter	61 min
Jul 13, 7:01 PM EDT	Severe Thunderstorm Warning	CTP	Centre, Clinton	44 min
Jul 13, 7:07 PM EDT	Special Weather Statement	CTP	Clinton	23 min
Jul 13, 7:08 PM EDT	Special Weather Statement	CTP	Somerset	37 min
Jul 13, 7:16 PM EDT	Severe Thunderstorm Warning	CTP	Centre, Huntingdon, Mifflin	44 min
Jul 13, 7:26 PM EDT	Severe Thunderstorm Warning	CTP	Lycoming, Tioga	64 min
Jul 13, 7:29 PM EDT	Areal Flood Advisory	CTP	Centre, Clinton	3 hr
Jul 13, 7:44 PM EDT	Severe Thunderstorm Warning	CTP	Clinton, Lycoming, Tioga	61 min
Jul 13, 7:55 PM EDT	Flash Flood Warning	CTP	Lycoming, Tioga	2 hr
Jul 13, 7:58 PM EDT	Areal Flood Advisory	CTP	Centre, Clinton	2 hr
Jul 13, 7:59 PM EDT	Severe Thunderstorm Warning	CTP	Centre, Clinton, Mifflin, Snyder, Union	46 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.