Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 286, NWS State College, PA

October 16, 2021Elk County, Pennsylvania

NWS State College, PA issued this severe thunderstorm warning at Oct 16, 2021, 8:13 AM EDT for Elk County, Pennsylvania. It was in force for 47 min. 3 reports 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: Oct 16, 2021, 8:13 AM EDT (12:13 UTC)
Expired: Oct 16, 2021, 9:00 AM EDT
In force: 47 min
Issued by: NWS State College, PA
Area: Storm-based polygon
Tornado: Possible
Hail: 0.75 in
Wind: 60.0 mph

County Elk County, PA

The radar

The State College radar (KCCX), 86 km from the middle of the area, began a volume at 12:13 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
Oct 16, 8:30 AM EDT	TSTM WND DMG	Ridgway, PA	CORRECTS PREVIOUS TSTM WND DMG REPORT FROM RIDGWAY. TREE DOWN ON A RESIDENCE ON ALLENHURST AVE.
Oct 16, 8:30 AM EDT	TSTM WND DMG	Ridgway, PA	MULTIPLE REPORTS OF TREES AND WIRES DOWN IN RIDGWAY.
Oct 16, 9:00 AM EDT	TSTM WND DMG	Ridgway, PA	TREE DOWN ON A RESIDENCE ON ALLENHURST AVE.

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

The nearest sounding before it

Pittsburgh, PA (KPIT), launched 12:00Z, 0.2 hours before the alert went out and 162 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: 1 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 509 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: -195 m²/s²
0-3 km storm-relative helicity: -101 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

113 
WUUS51 KCTP 161213
SVRCTP
PAC047-161300-
/O.NEW.KCTP.SV.W.0286.211016T1213Z-211016T1300Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service State College PA
813 AM EDT Sat Oct 16 2021

The National Weather Service in State College PA has issued a

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

* Until 900 AM EDT.

* At 812 AM EDT, severe thunderstorms were located along a line
  extending from near Marienville to 7 miles west of Portland Mills
  to 9 miles west of Brockway to 7 miles northeast of Brookville,
  moving northeast at 50 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Severe thunderstorms will be near...
  Portland Mills around 820 AM EDT.
  Ridgway, Johnsonburg, Brandy Camp, Wilcox, James City and 
  Brockport around 830 AM EDT.
  St. Marys and East Branch Dam around 840 AM EDT.

Other locations impacted by these severe thunderstorms include
Kersey.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4160 7848 4160 7842 4141 7842 4140 7825
      4124 7874 4126 7874 4137 7896 4137 7898
      4135 7902 4136 7905 4145 7906 4145 7898
      4144 7896 4157 7896 4162 7886 4163 7849
TIME...MOT...LOC 1212Z 240DEG 45KT 4147 7900 4139 7899 4134 7902 4129
7897 4123 7898

TORNADO...POSSIBLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Jurewicz

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 15, 11:06 PM EDT	Special Weather Statement	CTP	Mifflin	54 min
Oct 16, 8:47 AM EDT	Severe Thunderstorm Warning	CTP	Cameron, Elk, McKean, Potter	43 min
Oct 16, 9:28 AM EDT	Special Weather Statement	CTP	Potter	32 min
Oct 16, 10:18 AM EDT	Special Weather Statement	CTP	Centre	27 min
Oct 16, 10:54 AM EDT	Special Weather Statement	CTP	Lycoming	36 min
Oct 16, 11:39 AM EDT	Special Weather Statement	CTP	Sullivan	36 min
Oct 16, 1:27 PM EDT	Special Weather Statement	CTP	Dauphin, Lancaster, Lebanon, Schuylkill	63 min
Oct 16, 2:29 PM EDT	Special Weather Statement	CTP	Lancaster	31 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.