Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 255, NWS State College, PA

August 17, 2019Tioga County, Pennsylvania

NWS State College, PA issued this severe thunderstorm warning at Aug 17, 2019, 5:37 PM EDT for Tioga County, Pennsylvania. It was in force for 27 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 17, 2019, 5:37 PM EDT (21:37 UTC)
Expired: Aug 17, 2019, 6:04 PM EDT
In force: 27 min
Issued by: NWS State College, PA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Tioga County, PA

The radar

The State College radar (KCCX), 113 km from the middle of the area, began a volume at 21:38 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 watch it was issued in

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

Issued	Product	Office	Lasted
Aug 17, 4:03 PM EDT	Severe Thunderstorm Watch	SPC	4 hr

The nearest sounding before it

Buffalo Intl Airport, NY (KBUF), launched 12:00Z, 9.6 hours before the alert went out and 175 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

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 17, 4:56 PM EDT, 41 minutes earlier.

Area forecast discussion, Aug 17, 4:56 PM EDT, 41 minutes before

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Hazardous weather outlook, Aug 17, 4:38 PM EDT, 59 minutes before

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In the hours before

Local storm report, Aug 17, 3:48 PM EDT, 1 hour 49 minutes before

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Local storm report, Aug 17, 4:16 PM EDT, 1 hour 21 minutes before

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Local storm report, Aug 17, 4:17 PM EDT, 1 hour 20 minutes before

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Local storm report, Aug 17, 4:28 PM EDT, 1 hour 9 minutes before

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Local storm report, Aug 17, 4:34 PM EDT, 1 hour 3 minutes before

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Special weather statement, Aug 17, 4:57 PM EDT, 40 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 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, 3:04 PM EDT	Severe Thunderstorm Warning	CTP	McKean	56 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, 5:46 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.