Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 90, NWS State College, PA

July 7, 2021McKean County, Potter County, Pennsylvania

NWS State College, PA issued this severe thunderstorm warning at Jul 7, 2021, 6:43 PM EDT for McKean County, Potter County, Pennsylvania. It was in force for 77 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 7, 2021, 6:43 PM EDT (22:43 UTC)
Expired: Jul 7, 2021, 8:00 PM EDT
In force: 77 min
Issued by: NWS State College, PA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 70.0 mph

Counties McKean County, PA, Potter County, PA

The radar

The State College radar (KCCX), 111 km from the middle of the area, began a volume at 22:43 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 7, 3:31 PM EDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Buffalo Intl Airport, NY (KBUF), launched 12:00Z, 10.7 hours before the alert went out and 129 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: 161 J/kg
Mixed-layer CIN: -85 J/kg
Mixed-layer LCL: 734 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 81 m²/s²
0-3 km storm-relative helicity: 117 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

Open this sounding in Storm Lab

The text

As transmitted.

189 
WUUS51 KCTP 072243
SVRCTP
PAC083-105-080000-
/O.NEW.KCTP.SV.W.0090.210707T2243Z-210708T0000Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service State College PA
643 PM EDT Wed Jul 7 2021

The National Weather Service in State College PA has issued a

* Severe Thunderstorm Warning for...
  Northeastern McKean County in north central Pennsylvania...
  Northern Potter County in north central Pennsylvania...

* Until 800 PM EDT.

* At 641 PM EDT, a severe thunderstorm was located near Port
  Allegany, moving east at 30 mph.

  HAZARD...70 mph wind gusts and quarter size hail.

  SOURCE...Law enforcement reported hail and numerous downed trees 
           in the path of this storm.

  IMPACT...Hail damage to vehicles is expected. Expect considerable 
           tree damage. Wind damage is also likely to mobile homes, 
           roofs, and outbuildings.

* Locations impacted include...
  Coudersport, Port Allegany, Roulette, Shinglehouse, Genesee, Denton
  Hill State Park, Harrison Valley, Ulysses, Sweden Valley, Oswayo
  and Ski Denton Ski Area.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4200 7761 4174 7761 4178 7833 4198 7836
      4200 7816
TIME...MOT...LOC 2241Z 262DEG 24KT 4188 7824 

HAIL...1.00IN
WIND...70MPH
 
$$

Banghoff

2 follow-up statements

357 
WWUS51 KCTP 072302
SVSCTP

Severe Weather Statement
National Weather Service State College PA
702 PM EDT Wed Jul 7 2021

PAC083-072311-
/O.CAN.KCTP.SV.W.0090.000000T0000Z-210708T0000Z/
McKean PA-
702 PM EDT Wed Jul 7 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN MCKEAN COUNTY 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
north central Pennsylvania.

LAT...LON 4200 7761 4179 7761 4182 7820 4187 7821
      4199 7821
TIME...MOT...LOC 2301Z 262DEG 24KT 4190 7806 

$$

PAC105-080000-
/O.CON.KCTP.SV.W.0090.000000T0000Z-210708T0000Z/
Potter PA-
702 PM EDT Wed Jul 7 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 800 PM EDT
FOR NORTHERN POTTER COUNTY...

At 701 PM EDT, a severe thunderstorm was located 8 miles southeast of
Shinglehouse, moving east at 30 mph.

HAZARD...70 mph wind gusts and quarter size hail.

SOURCE...Law enforcement has reported quarter size hail and numerous 
         downed trees in the path of this storm.

IMPACT...Hail damage to vehicles is expected. Expect considerable 
         tree damage. Wind damage is also likely to mobile homes, 
         roofs, and outbuildings.

Locations impacted include...
Shinglehouse, Genesee, Harrison Valley, Ulysses and Oswayo. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4200 7761 4179 7761 4182 7820 4187 7821
      4199 7821
TIME...MOT...LOC 2301Z 262DEG 24KT 4190 7806 

HAIL...1.00IN
WIND...70MPH
 
$$

Banghoff

367 
WWUS51 KCTP 072356
SVSCTP

Severe Weather Statement
National Weather Service State College PA
756 PM EDT Wed Jul 7 2021

PAC105-080005-
/O.EXP.KCTP.SV.W.0090.000000T0000Z-210708T0000Z/
Potter PA-
756 PM EDT Wed Jul 7 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN POTTER COUNTY WILL
EXPIRE AT 800 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.  However heavy rain is still possible with 
this thunderstorm. A Flood Advisory is in effect for NW Potter 
County until 945PM.

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

LAT...LON 4200 7761 4179 7761 4182 7820 4187 7821
      4199 7821
TIME...MOT...LOC 2355Z 262DEG 24KT 4195 7760 

$$

Banghoff

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 7, 3:35 PM EDT	Special Weather Statement	CTP	Fulton	40 min
Jul 7, 4:00 PM EDT	Special Weather Statement	CTP	Warren	45 min
Jul 7, 4:05 PM EDT	Special Weather Statement	CTP	Somerset	25 min
Jul 7, 4:12 PM EDT	Special Weather Statement	CTP	Somerset	33 min
Jul 7, 4:12 PM EDT	Severe Thunderstorm Warning	CTP	Cambria, Somerset	47 min
Jul 7, 4:22 PM EDT	Severe Thunderstorm Warning	CTP	Bedford, Somerset	38 min
Jul 7, 4:44 PM EDT	Severe Thunderstorm Warning	CTP	Cambria	61 min
Jul 7, 4:46 PM EDT	Special Weather Statement	CTP	Warren	29 min
Jul 7, 4:48 PM EDT	Special Weather Statement	CTP	Bedford	27 min
Jul 7, 4:54 PM EDT	Severe Thunderstorm Warning	CTP	Bedford, Somerset	51 min
Jul 7, 4:59 PM EDT	Special Weather Statement	CTP	Warren	31 min
Jul 7, 5:07 PM EDT	Severe Thunderstorm Warning	CTP	McKean, Warren	53 min
Jul 7, 5:12 PM EDT	Special Weather Statement	CTP	Blair	33 min
Jul 7, 5:19 PM EDT	Severe Thunderstorm Warning	CTP	Blair	41 min
Jul 7, 5:23 PM EDT	Severe Thunderstorm Warning	CTP	Bedford	37 min
Jul 7, 5:27 PM EDT	Special Weather Statement	CTP	Clearfield	33 min
Jul 7, 5:35 PM EDT	Severe Thunderstorm Warning	CTP	Blair	25 min
Jul 7, 5:38 PM EDT	Special Weather Statement	CTP	Warren	37 min
Jul 7, 5:42 PM EDT	Special Weather Statement	CTP	Cumberland	33 min
Jul 7, 5:48 PM EDT	Severe Thunderstorm Warning	CTP	Blair, Huntingdon	57 min
Jul 7, 5:50 PM EDT	Severe Thunderstorm Warning	CTP	Cumberland, Franklin	40 min
Jul 7, 5:55 PM EDT	Severe Thunderstorm Warning	CTP	McKean	65 min
Jul 7, 6:00 PM EDT	Special Weather Statement	CTP	Elk	30 min
Jul 7, 6:12 PM EDT	Severe Thunderstorm Warning	CTP	Centre, Clearfield, Huntingdon	48 min
Jul 7, 6:22 PM EDT	Special Weather Statement	CTP	Mifflin	23 min
Jul 7, 6:29 PM EDT	Severe Thunderstorm Warning	CTP	Warren	61 min
Jul 7, 6:36 PM EDT	Severe Thunderstorm Warning	CTP	Centre, Clearfield, Clinton, Mifflin	39 min
Jul 7, 6:37 PM EDT	Severe Thunderstorm Warning	CTP	Cumberland, Franklin, Perry	37 min
Jul 7, 6:56 PM EDT	Severe Thunderstorm Warning	CTP	Centre, Clinton, Mifflin, Snyder, Union	49 min
Jul 7, 7:09 PM EDT	Severe Thunderstorm Warning	CTP	Juniata, Mifflin, Snyder	36 min
Jul 7, 7:19 PM EDT	Areal Flood Advisory	CTP	Warren	116 min
Jul 7, 7:31 PM EDT	Severe Thunderstorm Warning	CTP	Clinton, Lycoming, Montour, Northumberland, Union	44 min
Jul 7, 7:44 PM EDT	Areal Flood Advisory	CTP	McKean, Potter	2 hr
Jul 7, 7:48 PM EDT	Special Weather Statement	CTP	Bedford	27 min
Jul 7, 7:50 PM EDT	Special Weather Statement	CTP	Tioga	10 min
Jul 7, 7:51 PM EDT	Special Weather Statement	CTP	Potter	24 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.