Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 266, NWS State College, PA

September 8, 2021Juniata County, Mifflin County, Snyder County, Pennsylvania

NWS State College, PA issued this severe thunderstorm warning at Sep 8, 2021, 4:36 PM EDT for Juniata County, Mifflin County, Snyder County, Pennsylvania. It was in force for 39 min. 4 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: Sep 8, 2021, 4:36 PM EDT (20:36 UTC)
Expired: Sep 8, 2021, 5:15 PM EDT
In force: 39 min
Issued by: NWS State College, PA
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Juniata County, PA, Mifflin County, PA, Snyder County, PA

The radar

The State College radar (KCCX), 75 km from the middle of the area, began a volume at 20:35 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
Sep 8, 4:44 PM EDT	TSTM WND DMG	Lewistown, PA	TREES AND WIRES DOWN.
Sep 8, 4:45 PM EDT	TSTM WND DMG	Lewistown, PA	NUMEROUS REPORTS OF TREES AND WIRES DOWN ACROSS LEWISTOWN.
Sep 8, 5:00 PM EDT	TSTM WND DMG	1 Wsw Mcclure, PA	TREE AND WIRES DOWN.
Sep 8, 5:00 PM EDT	TSTM WND DMG	Mcclure, PA	MULTIPLE TREES DOWN.

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

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 8.6 hours before the alert went out and 198 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1137 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 127 m²/s²
0-3 km storm-relative helicity: 137 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

840 
WUUS51 KCTP 082036
SVRCTP
PAC067-087-109-082115-
/O.NEW.KCTP.SV.W.0266.210908T2036Z-210908T2115Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service State College PA
436 PM EDT Wed Sep 8 2021

The National Weather Service in State College PA has issued a

* Severe Thunderstorm Warning for...
  Central Mifflin County in central Pennsylvania...
  Northern Juniata County in central Pennsylvania...
  Snyder County in central Pennsylvania...

* Until 515 PM EDT.

* At 436 PM EDT, a severe thunderstorm was located over Highland
  Park, moving east at 45 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* This severe thunderstorm will be near...
  Alfarata, Belltown and Reeds Gap State Park around 450 PM EDT.
  McClure and Mcalisterville around 500 PM EDT.
  Richfield, Beaver Springs, Paxtonville, Mount Pleasant Mills, 
  Middleburg, Fremont and Troxelville around 510 PM EDT.

Other locations impacted by this severe thunderstorm include
Mifflintown, Beavertown, Maitland, Wagner, Barrville, Freeburg, East
Salem, Mifflin and Herndon.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4051 7765 4066 7770 4068 7768 4087 7705
      4086 7702 4089 7694 4088 7690 4076 7685
      4072 7686 4069 7687 4066 7692 4063 7695
TIME...MOT...LOC 2036Z 253DEG 38KT 4063 7758 

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
Sep 8, 3:07 PM EDT	Special Weather Statement	CTP	Lycoming	23 min
Sep 8, 3:12 PM EDT	Special Weather Statement	CTP	Centre	33 min
Sep 8, 3:27 PM EDT	Severe Thunderstorm Warning	CTP	Lycoming, Sullivan	33 min
Sep 8, 3:29 PM EDT	Special Weather Statement	CTP	Blair	31 min
Sep 8, 3:59 PM EDT	Special Weather Statement	CTP	Huntingdon	31 min
Sep 8, 4:29 PM EDT	Special Weather Statement	CTP	Mifflin	46 min
Sep 8, 5:11 PM EDT	Severe Thunderstorm Warning	CTP	Juniata, Northumberland, Snyder	49 min
Sep 8, 5:57 PM EDT	Severe Thunderstorm Warning	CTP	Columbia, Northumberland, Schuylkill	37 min
Sep 8, 6:21 PM EDT	Flash Flood Watch	CTP	Adams, Lancaster, York	7 hr
Sep 8, 6:36 PM EDT	Special Weather Statement	CTP	Columbia	39 min
Sep 8, 7:18 PM EDT	Special Weather Statement	CTP	Carbon	27 min
Sep 8, 7:43 PM EDT	Special Weather Statement	CTP	Schuylkill	17 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.