Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 19, NWS State College, PA

June 9, 2021Potter County, Pennsylvania

NWS State College, PA issued this severe thunderstorm warning at Jun 9, 2021, 2:04 PM EDT for Potter County, Pennsylvania. It was in force for 26 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: Jun 9, 2021, 2:04 PM EDT (18:04 UTC)
Expired: Jun 9, 2021, 2:30 PM EDT
In force: 26 min
Issued by: NWS State College, PA
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

County Potter County, PA

The radar

The State College radar (KCCX), 113 km from the middle of the area, began a volume at 18:06 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 nearest sounding before it

Buffalo Intl Airport, NY (KBUF), launched 12:00Z, 6.1 hours before the alert went out and 130 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: 68 J/kg
Mixed-layer CIN: -116 J/kg
Mixed-layer LCL: 905 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: 73 m²/s²
0-3 km storm-relative helicity: 79 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

960 
WUUS51 KCTP 091804
SVRCTP
PAC105-091830-
/O.NEW.KCTP.SV.W.0019.210609T1804Z-210609T1830Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service State College PA
204 PM EDT Wed Jun 9 2021

The National Weather Service in State College PA has issued a

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

* Until 230 PM EDT.

* At 203 PM EDT, a severe thunderstorm was located near Genesee,
  moving southwest at 20 mph.

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

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Coudersport, Genesee, Ulysses, Sweden Valley and Oswayo. 

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 4200 7770 4189 7765 4174 7800 4199 7814
      4200 7806
TIME...MOT...LOC 1803Z 068DEG 15KT 4195 7780 

HAIL...0.75IN
WIND...60MPH
 
$$

Martin

1 follow-up statement

985 
WWUS51 KCTP 091814
SVSCTP

Severe Weather Statement
National Weather Service State College PA
214 PM EDT Wed Jun 9 2021

PAC105-091830-
/O.CON.KCTP.SV.W.0019.000000T0000Z-210609T1830Z/
Potter PA-
214 PM EDT Wed Jun 9 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 230 PM EDT
FOR NORTHERN POTTER COUNTY...

At 213 PM EDT, a severe thunderstorm was located just southwest of 
Genesee, moving southwest at 15 mph.

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

SOURCE...Radar indicated.

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

Locations impacted include...
Coudersport, Genesee, Ulysses, Sweden Valley and Oswayo. 

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 4200 7770 4189 7765 4174 7800 4199 7814
      4200 7806
TIME...MOT...LOC 1813Z 068DEG 15KT 4193 7785 

HAIL...0.75IN
WIND...60MPH
 
$$

Martin

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 9, 1:37 PM EDT	Special Weather Statement	CTP	Tioga	53 min
Jun 9, 2:11 PM EDT	Special Weather Statement	CTP	Clearfield	34 min
Jun 9, 2:18 PM EDT	Special Weather Statement	CTP	Elk	27 min
Jun 9, 2:36 PM EDT	Special Weather Statement	CTP	Potter	24 min
Jun 9, 2:43 PM EDT	Special Weather Statement	CTP	Blair	32 min
Jun 9, 2:51 PM EDT	Special Weather Statement	CTP	Potter	24 min
Jun 9, 2:55 PM EDT	Special Weather Statement	CTP	Dauphin	35 min
Jun 9, 2:59 PM EDT	Special Weather Statement	CTP	Centre	31 min
Jun 9, 3:03 PM EDT	Special Weather Statement	CTP	Huntingdon	27 min
Jun 9, 3:08 PM EDT	Special Weather Statement	CTP	McKean	37 min
Jun 9, 3:14 PM EDT	Special Weather Statement	CTP	Cameron	31 min
Jun 9, 3:27 PM EDT	Special Weather Statement	CTP	Dauphin	33 min
Jun 9, 3:36 PM EDT	Special Weather Statement	CTP	Forest	24 min
Jun 9, 3:52 PM EDT	Special Weather Statement	CTP	McKean	23 min
Jun 9, 4:02 PM EDT	Severe Thunderstorm Warning	CTP	McKean, Warren	28 min
Jun 9, 4:31 PM EDT	Special Weather Statement	CTP	Warren	59 min
Jun 9, 5:09 PM EDT	Special Weather Statement	CTP	Warren	66 min
Jun 9, 5:13 PM EDT	Special Weather Statement	CTP	York	62 min
Jun 9, 5:35 PM EDT	Areal Flood Advisory	CTP	Cumberland, York	85 min
Jun 9, 5:36 PM EDT	Special Weather Statement	CTP	Schuylkill	54 min
Jun 9, 5:46 PM EDT	Severe Thunderstorm Warning	CTP	Schuylkill	44 min
Jun 9, 6:00 PM EDT	Special Weather Statement	CTP	Adams	30 min
Jun 9, 6:14 PM EDT	Areal Flood Advisory	CTP	Schuylkill	23 min
Jun 9, 6:28 PM EDT	Severe Thunderstorm Warning	CTP	Schuylkill	62 min
Jun 9, 6:30 PM EDT	Special Weather Statement	CTP	York	45 min
Jun 9, 6:37 PM EDT	Flash Flood Warning	CTP	Schuylkill	3 hr
Jun 9, 6:38 PM EDT	Special Weather Statement	CTP	Lycoming	52 min
Jun 9, 7:05 PM EDT	Special Weather Statement	CTP	Lancaster	40 min
Jun 9, 7:09 PM EDT	Severe Thunderstorm Warning	CTP	Lancaster, York	51 min
Jun 9, 7:54 PM EDT	Special Weather Statement	CTP	Lancaster	36 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.