Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 198, NWS State College, PA

August 11, 2021Mifflin County, Pennsylvania

NWS State College, PA issued this severe thunderstorm warning at Aug 11, 2021, 3:34 PM EDT for Mifflin County, Pennsylvania. It was in force for 41 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 11, 2021, 3:34 PM EDT (19:34 UTC)
Expired: Aug 11, 2021, 4:15 PM EDT
In force: 41 min
Issued by: NWS State College, PA
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

County Mifflin County, PA

The radar

The State College radar (KCCX), 51 km from the middle of the area, began a volume at 19:34 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 11, 4:05 PM EDT	TSTM WND DMG	1 S Burnham, PA	MULTIPLE TREES DOWN.

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

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Aug 11, 3:02 PM EDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 7.6 hours before the alert went out and 177 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: 553 J/kg
Mixed-layer CIN: -190 J/kg
Mixed-layer LCL: 1301 m above ground
0-6 km bulk shear: 13 kt
0-1 km storm-relative helicity: 20 m²/s²
0-3 km storm-relative helicity: 77 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

272 
WUUS51 KCTP 111934
SVRCTP
PAC087-112015-
/O.NEW.KCTP.SV.W.0198.210811T1934Z-210811T2015Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service State College PA
334 PM EDT Wed Aug 11 2021

The National Weather Service in State College PA has issued a

* Severe Thunderstorm Warning for...
  Mifflin County in central Pennsylvania...

* Until 415 PM EDT.

* At 333 PM EDT, severe thunderstorms were located along a line
  extending from Mcalevys Fort to Allensville to Mount Union, moving
  east at 40 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Lewistown, Mount Union, Burnham, Belleville, Highland Park,
  Yeagertown, Strodes Mills, Reedsville, Juniata Terrace,
  Allensville, Maitland, McVeytown, Kistler, Longfellow, Newton
  Hamilton, Atkinson Mills and Barrville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Wind damage with these storms will occur before any rain or
lightning. Do not wait for the sound of thunder before taking cover.
SEEK SHELTER IMMEDIATELY inside a sturdy structure and stay away from
windows.

&&

LAT...LON 4037 7786 4039 7787 4040 7791 4050 7781
      4055 7784 4058 7783 4068 7769 4069 7771
      4068 7767 4065 7743 4061 7750 4058 7750
      4056 7753 4051 7761 4049 7761 4037 7776
TIME...MOT...LOC 1933Z 272DEG 34KT 4065 7780 4054 7779 4040 7789 

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

$$

Colbert

1 follow-up statement

850 
WWUS51 KCTP 112014
SVSCTP

Severe Weather Statement
National Weather Service State College PA
414 PM EDT Wed Aug 11 2021

PAC087-112024-
/O.EXP.KCTP.SV.W.0198.000000T0000Z-210811T2015Z/
Mifflin PA-
414 PM EDT Wed Aug 11 2021

...THE SEVERE THUNDERSTORM WARNING FOR MIFFLIN COUNTY WILL EXPIRE AT
415 PM EDT...
    
The storms which prompted the warning have moved out of the area.
Therefore, the warning will be allowed to expire.

A Severe Thunderstorm Watch remains in effect until 900 PM EDT for
central Pennsylvania.

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
State College PA.

LAT...LON 4037 7786 4039 7787 4040 7791 4050 7781
      4055 7784 4058 7783 4068 7769 4069 7771
      4068 7767 4065 7743 4061 7750 4058 7750
      4056 7753 4051 7761 4049 7761 4037 7776
TIME...MOT...LOC 2014Z 272DEG 34KT 4064 7731 4053 7730 4039 7740 

$$

Banghoff

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 11, 12:18 AM EDT	Special Weather Statement	CTP	Union	27 min
Aug 11, 3:38 AM EDT	Excessive Heat Warning	CTP	Adams, Columbia, Cumberland, Dauphin, Franklin, Juniata and 10 more	39 hr
Aug 11, 5:03 AM EDT	Special Weather Statement	CTP	Warren	27 min
Aug 11, 6:40 AM EDT	Special Weather Statement	CTP	McKean	50 min
Aug 11, 2:11 PM EDT	Special Weather Statement	CTP	Cambria	49 min
Aug 11, 2:32 PM EDT	Severe Thunderstorm Warning	CTP	Dauphin, Lancaster, Lebanon, York	58 min
Aug 11, 2:59 PM EDT	Special Weather Statement	CTP	Somerset	61 min
Aug 11, 3:02 PM EDT	Special Weather Statement	CTP	Blair	28 min
Aug 11, 3:13 PM EDT	Severe Thunderstorm Warning	CTP	Bedford, Blair, Huntingdon	46 min
Aug 11, 3:28 PM EDT	Severe Thunderstorm Warning	CTP	Centre, Huntingdon, Mifflin	62 min
Aug 11, 3:35 PM EDT	Special Weather Statement	CTP	Huntingdon	25 min
Aug 11, 3:49 PM EDT	Special Weather Statement	CTP	Juniata	26 min
Aug 11, 3:55 PM EDT	Special Weather Statement	CTP	Dauphin	35 min
Aug 11, 4:07 PM EDT	Special Weather Statement	CTP	York	38 min
Aug 11, 4:08 PM EDT	Special Weather Statement	CTP	Franklin	37 min
Aug 11, 4:13 PM EDT	Special Weather Statement	CTP	Juniata, Perry, Snyder, Union	32 min
Aug 11, 4:23 PM EDT	Severe Thunderstorm Warning	CTP	Centre, Snyder, Union	59 min
Aug 11, 4:37 PM EDT	Severe Thunderstorm Warning	CTP	Dauphin	53 min
Aug 11, 4:42 PM EDT	Special Weather Statement	CTP	York	33 min
Aug 11, 4:43 PM EDT	Special Weather Statement	CTP	Cumberland	32 min
Aug 11, 4:47 PM EDT	Severe Thunderstorm Warning	CTP	Dauphin, Juniata, Northumberland, Perry, Snyder	53 min
Aug 11, 4:52 PM EDT	Areal Flood Advisory	CTP	Dauphin	2 hr
Aug 11, 4:54 PM EDT	Special Weather Statement	CTP	Lebanon	36 min
Aug 11, 5:00 PM EDT	Flash Flood Warning Considerable damage threat	CTP	Cumberland, Dauphin, York	85 min
Aug 11, 5:00 PM EDT	Special Weather Statement	CTP	York	30 min
Aug 11, 5:08 PM EDT	Severe Thunderstorm Warning	CTP	Columbia, Montour, Northumberland	52 min
Aug 11, 5:14 PM EDT	Severe Thunderstorm Warning	CTP	Lancaster	46 min
Aug 11, 5:35 PM EDT	Severe Thunderstorm Warning	CTP	Columbia, Northumberland	48 min
Aug 11, 5:44 PM EDT	Areal Flood Advisory	CTP	Lancaster, Lebanon	2 hr
Aug 11, 5:47 PM EDT	Special Weather Statement	CTP	Lancaster, York	58 min
Aug 11, 5:54 PM EDT	Severe Thunderstorm Warning	CTP	Lancaster, York	51 min
Aug 11, 5:58 PM EDT	Severe Thunderstorm Warning	CTP	Lancaster	47 min
Aug 11, 6:25 PM EDT	Areal Flood Advisory	CTP	Cumberland, Dauphin, York	95 min
Aug 11, 7:14 PM EDT	Special Weather Statement	CTP	Warren	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.