Alert archive / Pennsylvania / Special Weather Statements in 2017

Special Weather Statement, NWS State College, PA

August 21, 2017Columbia County, Pennsylvania

NWS State College, PA issued this special weather statement at Aug 21, 2017, 9:45 PM EDT for Columbia County, Pennsylvania. It was in force for 75 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Aug 21, 2017, 9:45 PM EDT (01:45 UTC)
Expired: Aug 21, 2017, 11:00 PM EDT
In force: 75 min
Issued by: NWS State College, PA

County Columbia County, PA

The radar

The Binghamton radar (KBGM), 141 km from the middle of the area, began a volume at 01:46 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 00:00Z, 1.8 hours before the alert went out and 242 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: 348 J/kg
Mixed-layer CIN: -77 J/kg
Mixed-layer LCL: 1281 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 52 m²/s²
0-3 km storm-relative helicity: 86 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Aug 21, 6:46 PM EDT, 2 hours 59 minutes earlier.

Area forecast discussion, Aug 21, 6:46 PM EDT, 2 hours 59 minutes before

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Hazardous weather outlook, Aug 21, 4:09 AM EDT, 17 hours 36 minutes before

Hazardous Weather Outlook
National Weather Service State College PA
409 AM EDT Mon Aug 21 2017

PAZ028-036-042-046-049>053-056>059-063>066-220815-
Juniata-Franklin-Sullivan-Southern Lycoming-Union-Snyder-Montour-
Northumberland-Columbia-Perry-Dauphin-Schuylkill-Lebanon-Cumberland-
Adams-York-Lancaster-
409 AM EDT Mon Aug 21 2017

This Hazardous Weather Outlook is for central Pennsylvania.

.DAY ONE...Today and Tonight.

There will be a Marginal Risk of severe thunderstorms this afternoon and
evening.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday.

There will be a Slight Risk of severe thunderstorms Tuesday
afternoon and evening.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

PAZ004>006-010>012-017>019-024>027-033>035-037-041-045-220815-
Warren-McKean-Potter-Elk-Cameron-Northern Clinton-Clearfield-
Northern Centre-Southern Centre-Cambria-Blair-Huntingdon-Mifflin-
Somerset-Bedford-Fulton-Tioga-Northern Lycoming-Southern Clinton-
409 AM EDT Mon Aug 21 2017

This Hazardous Weather Outlook is for central Pennsylvania.

.DAY ONE...Today and Tonight.

The probability of widespread severe weather will be low.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday.

There will be a Slight Risk of severe thunderstorms Tuesday
afternoon and evening.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

In the hours before

Special weather statement, Aug 21, 4:26 PM EDT, 5 hours 19 minutes before

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Special weather statement, Aug 21, 5:35 PM EDT, 4 hours 10 minutes before

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Special weather statement, Aug 21, 5:46 PM EDT, 3 hours 59 minutes before

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Special weather statement, Aug 21, 6:49 PM EDT, 2 hours 56 minutes before

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Local storm report, Aug 21, 7:15 PM EDT, 2 hours 30 minutes before

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Special weather statement, Aug 21, 9:45 PM EDT, 0 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 21, 9:32 PM EDT	Areal Flood Advisory	CTP	Lancaster	3 hr
Aug 22, 12:43 PM EDT	Special Weather Statement	CTP	Elk, McKean, Warren	32 min
Aug 22, 1:12 PM EDT	Special Weather Statement	CTP	McKean	33 min
Aug 22, 1:45 PM EDT	Special Weather Statement	CTP	Elk, McKean	30 min
Aug 22, 2:09 PM EDT	Severe Thunderstorm Warning	CTP	Cameron, Clearfield, Elk, McKean, Warren	66 min
Aug 22, 2:44 PM EDT	Special Weather Statement	CTP	Potter	31 min
Aug 22, 2:48 PM EDT	Special Weather Statement	CTP	Warren	72 min
Aug 22, 2:55 PM EDT	Severe Thunderstorm Warning	CTP	Clearfield	77 min
Aug 22, 2:59 PM EDT	Special Weather Statement	CTP	Cambria	76 min
Aug 22, 3:14 PM EDT	Severe Thunderstorm Warning	CTP	Cameron, Clinton, Elk, Lycoming, Potter, Tioga	76 min
Aug 22, 3:26 PM EDT	Severe Thunderstorm Warning	CTP	Bedford, Blair, Cambria	64 min
Aug 22, 3:40 PM EDT	Special Weather Statement	CTP	McKean, Warren	65 min
Aug 22, 4:05 PM EDT	Special Weather Statement	CTP	Elk	70 min
Aug 22, 4:21 PM EDT	Special Weather Statement	CTP	Montour	24 min
Aug 22, 4:27 PM EDT	Special Weather Statement	CTP	Cambria	48 min
Aug 22, 5:03 PM EDT	Special Weather Statement	CTP	Somerset	27 min
Aug 22, 5:09 PM EDT	Severe Thunderstorm Warning	CTP	Cameron, Elk, McKean, Potter	66 min
Aug 22, 5:15 PM EDT	Severe Thunderstorm Warning	CTP	Somerset	54 min
Aug 22, 5:17 PM EDT	Tornado Warning	CTP	Cameron, McKean	43 min
Aug 22, 5:27 PM EDT	Special Weather Statement	CTP	Cambria	33 min
Aug 22, 5:33 PM EDT	Severe Thunderstorm Warning	CTP	Cambria	36 min
Aug 22, 5:38 PM EDT	Severe Thunderstorm Warning	CTP	Potter	37 min
Aug 22, 5:44 PM EDT	Special Weather Statement	CTP	Cameron, Clearfield, Elk	46 min
Aug 22, 5:46 PM EDT	Severe Thunderstorm Warning	CTP	Bedford, Blair	44 min
Aug 22, 5:51 PM EDT	Tornado Warning	CTP	Potter	39 min
Aug 22, 6:13 PM EDT	Severe Thunderstorm Warning	CTP	Potter, Tioga	53 min
Aug 22, 6:43 PM EDT	Special Weather Statement	CTP	Sullivan	32 min
Aug 22, 6:59 PM EDT	Special Weather Statement	CTP	Dauphin, Lebanon	31 min
Aug 22, 7:14 PM EDT	Special Weather Statement	CTP	Dauphin	31 min
Aug 22, 7:23 PM EDT	Severe Thunderstorm Warning	CTP	Dauphin, Lebanon, Schuylkill	67 min
Aug 22, 7:24 PM EDT	Severe Thunderstorm Warning	CTP	Columbia	21 min
Aug 22, 7:41 PM EDT	Special Weather Statement	CTP	Cumberland	34 min
Aug 22, 7:50 PM EDT	Special Weather Statement	CTP	Schuylkill	25 min
Aug 22, 7:59 PM EDT	Severe Thunderstorm Warning	CTP	Dauphin, Lebanon	46 min

Nearby

Special Weather Statements in Pennsylvania, 2017 Every special weather statement in 2017

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.