Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 252, NWS State College, PA

August 17, 2019McKean County, Pennsylvania

NWS State College, PA issued this severe thunderstorm warning at Aug 17, 2019, 3:04 PM EDT for McKean County, 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: Aug 17, 2019, 3:04 PM EDT (19:04 UTC)
Expired: Aug 17, 2019, 4:00 PM EDT
In force: 56 min
Issued by: NWS State College, PA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County McKean County, PA

The radar

The State College radar (KCCX), 117 km from the middle of the area, began a volume at 19:05 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
Aug 17, 3:35 PM EDT	TSTM WND DMG	Lafayette, PA	TREE AND WIRES DOWN ON ROUTE 59 AND BIG SHANTY RD.

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

The nearest sounding before it

Buffalo Intl Airport, NY (KBUF), launched 12:00Z, 7.1 hours before the alert went out and 119 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: 39 J/kg
Mixed-layer CIN: -138 J/kg
Mixed-layer LCL: 1233 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 74 m²/s²
0-3 km storm-relative helicity: 126 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

800 
WUUS51 KCTP 171904
SVRCTP
PAC083-172000-
/O.NEW.KCTP.SV.W.0252.190817T1904Z-190817T2000Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service State College PA
304 PM EDT Sat Aug 17 2019

The National Weather Service in State College PA has issued a

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

* Until 400 PM EDT.

* At 304 PM EDT, a severe thunderstorm was located near Scandia,
  moving east at 45 mph.

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

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Bradford, Port Allegany, Smethport, Rew, Coryville, Crosby,
  Cyclone, Marshburg, Westline, Kinzua Bridge State Park, Eldred,
  Lewis Run, University Of Pittsburgh - Bradford and Bradford
  Airport.

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
flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4173 7820 4176 7895 4183 7895 4183 7892
      4199 7892 4200 7879 4200 7821
TIME...MOT...LOC 1904Z 266DEG 40KT 4189 7896 

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

La Corte

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 17, 11:38 AM EDT	Special Weather Statement	CTP	Lancaster, York	52 min
Aug 17, 12:30 PM EDT	Special Weather Statement	CTP	Lancaster	45 min
Aug 17, 1:11 PM EDT	Special Weather Statement	CTP	Lancaster	34 min
Aug 17, 1:34 PM EDT	Special Weather Statement	CTP	Lebanon	26 min
Aug 17, 1:37 PM EDT	Special Weather Statement	CTP	Schuylkill	53 min
Aug 17, 1:42 PM EDT	Special Weather Statement	CTP	Warren	63 min
Aug 17, 2:42 PM EDT	Special Weather Statement	CTP	Warren	63 min
Aug 17, 2:47 PM EDT	Severe Thunderstorm Warning	CTP	Warren	43 min
Aug 17, 3:59 PM EDT	Severe Thunderstorm Warning	CTP	Potter, Tioga	61 min
Aug 17, 4:05 PM EDT	Severe Thunderstorm Warning	CTP	McKean	22 min
Aug 17, 4:57 PM EDT	Special Weather Statement	CTP	Tioga	33 min
Aug 17, 5:37 PM EDT	Severe Thunderstorm Warning	CTP	Tioga	27 min
Aug 17, 5:46 PM EDT	Severe Thunderstorm Warning	CTP	Clearfield	74 min
Aug 17, 6:49 PM EDT	Special Weather Statement	CTP	Sullivan	26 min
Aug 17, 7:22 PM EDT	Special Weather Statement	CTP	Centre	23 min
Aug 17, 7:25 PM EDT	Special Weather Statement	CTP	Sullivan	35 min
Aug 17, 7:45 PM EDT	Special Weather Statement	CTP	Mifflin	30 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2019 Every severe thunderstorm warning in 2019

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.