Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 140, NWS State College, PA

July 13, 20215 counties in Pennsylvania

NWS State College, PA issued this severe thunderstorm warning at Jul 13, 2021, 5:49 PM EDT for 5 counties in Pennsylvania. It was in force for 56 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 13, 2021, 5:49 PM EDT (21:49 UTC)
Expired: Jul 13, 2021, 6:45 PM EDT
In force: 56 min
Issued by: NWS State College, PA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Cameron County, PA, Centre County, PA, Clearfield County, PA, Clinton County, PA, Potter County, PA

The radar

The State College radar (KCCX), 47 km from the middle of the area, began a volume at 21:48 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 13, 6:37 PM EDT	TSTM WND DMG	2 Sw Wharton, PA	MULTIPLE TREES DOWN IN WHARTON.

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

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

Buffalo Intl Airport, NY (KBUF), launched 12:00Z, 9.8 hours before the alert went out and 185 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: 610 J/kg
Mixed-layer CIN: -36 J/kg
Mixed-layer LCL: 907 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 56 m²/s²
0-3 km storm-relative helicity: 90 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.9

Open this sounding in Storm Lab

The text

As transmitted.

799 
WUUS51 KCTP 132149
SVRCTP
PAC023-027-033-035-105-132245-
/O.NEW.KCTP.SV.W.0140.210713T2149Z-210713T2245Z/

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

The National Weather Service in State College PA has issued a

* Severe Thunderstorm Warning for...
  Northeastern Clearfield County in central Pennsylvania...
  Northwestern Centre County in central Pennsylvania...
  Southern Potter County in north central Pennsylvania...
  Eastern Cameron County in north central Pennsylvania...
  Northwestern Clinton County in north central Pennsylvania...

* Until 645 PM EDT.

* At 549 PM EDT, a severe thunderstorm was located near Karthaus,
  moving northeast at 30 mph.

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

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees.

* Locations impacted include...
  Wharton, Keating, Renovo, Karthaus, Pine Glen, Westport, Cross
  Fork, Tamarack, Stevenson Dam, Kettle Creek State Park, Ole Bull
  State Park and Driftwood.

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 4154 7760 4151 7760 4106 7803 4115 7830
      4123 7826 4123 7824 4128 7824 4160 7809
TIME...MOT...LOC 2149Z 210DEG 25KT 4122 7812 

HAIL...1.00IN
WIND...60MPH
 
$$

Travis

1 follow-up statement

083 
WWUS51 KCTP 132217
SVSCTP

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

PAC027-033-132226-
/O.CAN.KCTP.SV.W.0140.000000T0000Z-210713T2245Z/
Clearfield PA-Centre PA-
617 PM EDT Tue Jul 13 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN CLEARFIELD AND
NORTHWESTERN CENTRE COUNTIES IS CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

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

LAT...LON 4154 7760 4151 7760 4123 7790 4125 7790
      4123 7792 4122 7810 4123 7824 4128 7824
      4160 7809
TIME...MOT...LOC 2216Z 219DEG 30KT 4129 7801 

$$

PAC023-035-105-132245-
/O.CON.KCTP.SV.W.0140.000000T0000Z-210713T2245Z/
Potter PA-Cameron PA-Clinton PA-
617 PM EDT Tue Jul 13 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 645 PM EDT
FOR SOUTHERN POTTER...EASTERN CAMERON AND NORTHWESTERN CLINTON
COUNTIES...

At 616 PM EDT, a severe thunderstorm was located near Keating, moving
northeast at 35 mph.

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

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees.

Locations impacted include...
Wharton, Keating, Westport, Cross Fork, Tamarack, Stevenson Dam,
Kettle Creek State Park, Ole Bull State Park and Driftwood.

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 4154 7760 4151 7760 4123 7790 4125 7790
      4123 7792 4122 7810 4123 7824 4128 7824
      4160 7809
TIME...MOT...LOC 2216Z 219DEG 30KT 4129 7801 

HAIL...1.00IN
WIND...60MPH
 
$$

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, 5:53 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, 6:27 PM EDT	Severe Thunderstorm Warning	CTP	Somerset	37 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.