Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2010

Severe Thunderstorm Warning 187, NWS State College, PA

September 22, 20104 counties in Pennsylvania

NWS State College, PA issued this severe thunderstorm warning at Sep 22, 2010, 4:38 PM EDT for 4 counties in Pennsylvania. It was in force for 46 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: Sep 22, 2010, 4:38 PM EDT (20:38 UTC)
Expired: Sep 22, 2010, 5:24 PM EDT
In force: 46 min
Issued by: NWS State College, PA
Area: Storm-based polygon

Counties Columbia County, PA, Lycoming County, PA, Montour County, PA, Sullivan County, PA

The radar

The State College radar (KCCX), 117 km from the middle of the area, began a volume at 20:37 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
Sep 22, 2:34 PM EDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 8.6 hours before the alert went out and 200 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: 997 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 147 m²/s²
0-3 km storm-relative helicity: 140 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 Sep 22, 4:06 PM EDT, 32 minutes earlier.

Area forecast discussion, Sep 22, 4:06 PM EDT, 32 minutes before

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Hazardous weather outlook, Sep 22, 3:52 PM EDT, 46 minutes before

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In the hours before

Local storm report, Sep 22, 2:56 PM EDT, 1 hour 42 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
256 PM EDT WED SEP 22 2010

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0248 PM     TSTM WND DMG     PENFIELD                41.21N 78.60W
09/22/2010                   CLEARFIELD         PA   EMERGENCY MNGR

            TREES DOWN ON STATE PARK ROAD BLOCKING BOTH LANES BY
            PARKER DAM

&&

JAK

Special weather statement, Sep 22, 3:09 PM EDT, 1 hour 29 minutes before

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Special weather statement, Sep 22, 3:29 PM EDT, 1 hour 9 minutes before

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Special weather statement, Sep 22, 3:35 PM EDT, 1 hour 3 minutes before

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Local storm report, Sep 22, 4:05 PM EDT, 33 minutes before

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Local storm report, Sep 22, 4:20 PM EDT, 18 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
Sep 22, 2:24 PM EDT	Severe Thunderstorm Warning	CTP	Cameron, Centre, Clearfield, Clinton, Elk	66 min
Sep 22, 2:41 PM EDT	Special Weather Statement	CTP	Dauphin, Perry	34 min
Sep 22, 3:00 PM EDT	Tornado Warning	CTP	Cameron, Clearfield, Elk	30 min
Sep 22, 3:09 PM EDT	Special Weather Statement	CTP	Cumberland	36 min
Sep 22, 3:17 PM EDT	Severe Thunderstorm Warning	CTP	Cameron, Centre, Clearfield, Clinton	58 min
Sep 22, 3:19 PM EDT	Severe Thunderstorm Warning	CTP	Cumberland, Dauphin, Lancaster, York	56 min
Sep 22, 3:29 PM EDT	Special Weather Statement	CTP	Adams, York	61 min
Sep 22, 3:35 PM EDT	Special Weather Statement	CTP	Cambria	70 min
Sep 22, 3:38 PM EDT	Severe Thunderstorm Warning	CTP	Clinton, Lycoming, Tioga	55 min
Sep 22, 3:57 PM EDT	Severe Thunderstorm Warning	CTP	Adams, Lancaster, York	78 min
Sep 22, 4:00 PM EDT	Severe Thunderstorm Warning	CTP	Clinton, Lycoming, Montour, Northumberland, Union	60 min
Sep 22, 4:15 PM EDT	Severe Thunderstorm Warning	CTP	Lancaster, York	60 min
Sep 22, 4:43 PM EDT	Special Weather Statement	CTP	Blair, Centre, Huntingdon, Mifflin	62 min
Sep 22, 4:50 PM EDT	Severe Thunderstorm Warning	CTP	Bedford, Blair, Cambria, Fulton, Huntingdon, Somerset	70 min
Sep 22, 5:02 PM EDT	Severe Thunderstorm Warning	CTP	Lancaster, York	58 min
Sep 22, 5:20 PM EDT	Special Weather Statement	CTP	Montour, Northumberland, Schuylkill, Snyder	70 min
Sep 22, 5:37 PM EDT	Severe Thunderstorm Warning	CTP	Columbia, Montour, Northumberland, Schuylkill, Snyder	53 min
Sep 22, 5:54 PM EDT	Severe Thunderstorm Warning	CTP	Adams, Bedford, Cumberland, Franklin, Fulton, Huntingdon and 3 more	66 min
Sep 22, 6:04 PM EDT	Special Weather Statement	CTP	Dauphin, Lebanon	56 min
Sep 22, 6:17 PM EDT	Severe Thunderstorm Warning	CTP	Dauphin, Lancaster, Lebanon, Northumberland, Schuylkill	58 min
Sep 22, 6:30 PM EDT	Special Weather Statement	CTP	Schuylkill	30 min
Sep 22, 6:40 PM EDT	Severe Thunderstorm Warning	CTP	Schuylkill	35 min
Sep 22, 6:47 PM EDT	Severe Thunderstorm Warning	CTP	Adams, Cumberland, Dauphin, Franklin, Lancaster, Lebanon and 2 more	73 min
Sep 22, 7:45 PM EDT	Severe Thunderstorm Warning	CTP	Dauphin, Lancaster, Lebanon, York	60 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2010 Every severe thunderstorm warning in 2010

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.