Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 124, NWS State College, PA

August 7, 2020Mifflin County, Pennsylvania

NWS State College, PA issued this severe thunderstorm warning at Aug 7, 2020, 11:37 AM EDT for Mifflin County, Pennsylvania. It was in force for 53 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Aug 7, 2020, 11:37 AM EDT (15:37 UTC)
Expired: Aug 7, 2020, 12:30 PM EDT
In force: 53 min
Issued by: NWS State College, PA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Mifflin County, PA

The radar

The State College radar (KCCX), 48 km from the middle of the area, began a volume at 15:39 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

Washington/Dulle, VA (KIAD), launched 12:00Z, 3.6 hours before the alert went out and 186 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: 301 J/kg
Mixed-layer CIN: -67 J/kg
Mixed-layer LCL: 665 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: -37 m²/s²
0-3 km storm-relative helicity: 18 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS State College, PA wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 7, 11:36 AM EDT, 1 minute earlier.

Area forecast discussion, Aug 7, 11:36 AM EDT, 1 minute before

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Hazardous weather outlook, Aug 7, 10:09 AM EDT, 1 hour 28 minutes before

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In the hours before

Local storm report, Aug 7, 10:21 AM EDT, 1 hour 16 minutes before

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Local storm report, Aug 7, 10:23 AM EDT, 1 hour 14 minutes before

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Local storm report, Aug 7, 10:25 AM EDT, 1 hour 12 minutes before

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Local storm report, Aug 7, 11:05 AM EDT, 32 minutes before

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Local storm report, Aug 7, 11:06 AM EDT, 31 minutes before

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Special weather statement, Aug 7, 11:22 AM EDT, 15 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 7, 7:14 AM EDT	Special Weather Statement	CTP	Clinton	46 min
Aug 7, 7:26 AM EDT	Severe Thunderstorm Warning	CTP	Clinton	64 min
Aug 7, 8:08 AM EDT	Severe Thunderstorm Warning	CTP	Lycoming, Union	67 min
Aug 7, 8:37 AM EDT	Special Weather Statement	CTP	Montour	23 min
Aug 7, 9:11 AM EDT	Special Weather Statement	CTP	Northumberland	34 min
Aug 7, 9:13 AM EDT	Areal Flood Advisory	CTP	Sullivan	3 hr
Aug 7, 9:45 AM EDT	Areal Flood Advisory	CTP	Montour, Northumberland	2 hr
Aug 7, 9:51 AM EDT	Special Weather Statement	CTP	Columbia	39 min
Aug 7, 10:06 AM EDT	Flash Flood Watch	CTP	Adams, Centre, Clinton, Columbia, Cumberland, Dauphin and 14 more	9 hr
Aug 7, 10:10 AM EDT	Severe Thunderstorm Warning	CTP	Columbia, Schuylkill	65 min
Aug 7, 11:04 AM EDT	Areal Flood Advisory	CTP	Centre, Clinton, Huntingdon, Mifflin, Snyder, Union	2 hr
Aug 7, 11:22 AM EDT	Special Weather Statement	CTP	Mifflin	53 min
Aug 7, 12:35 PM EDT	Special Weather Statement	CTP	Cumberland	25 min
Aug 7, 12:54 PM EDT	Areal Flood Advisory	CTP	Snyder	2 hr
Aug 7, 1:51 PM EDT	Areal Flood Advisory	CTP	Columbia, Northumberland, Schuylkill	114 min
Aug 7, 2:59 PM EDT	Special Weather Statement	CTP	Snyder	46 min
Aug 7, 3:11 PM EDT	Areal Flood Advisory	CTP	Schuylkill	2 hr
Aug 7, 3:14 PM EDT	Areal Flood Advisory	CTP	Lancaster, York	3 hr
Aug 7, 3:31 PM EDT	Flash Flood Warning	CTP	Lancaster, York	3 hr
Aug 7, 3:37 PM EDT	Special Weather Statement	CTP	Huntingdon	23 min
Aug 7, 3:54 PM EDT	Special Weather Statement	CTP	Lancaster	36 min
Aug 7, 4:40 PM EDT	Flash Flood Warning Considerable damage threat	CTP	Lancaster, York	118 min
Aug 7, 5:07 PM EDT	Special Weather Statement	CTP	Blair	23 min
Aug 7, 5:42 PM EDT	Special Weather Statement	CTP	Tioga	33 min
Aug 7, 6:12 PM EDT	Special Weather Statement	CTP	Adams	33 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2020 Every severe thunderstorm warning in 2020

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.