Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2010

Severe Thunderstorm Warning 166, NWS State College, PA

August 4, 2010Juniata County, Mifflin County, Perry County, Pennsylvania

NWS State College, PA issued this severe thunderstorm warning at Aug 4, 2010, 6:55 PM EDT for Juniata County, Mifflin County, Perry County, Pennsylvania. It was in force for 65 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 4, 2010, 6:55 PM EDT (22:55 UTC)
Expired: Aug 4, 2010, 8:00 PM EDT
In force: 65 min
Issued by: NWS State College, PA
Area: Storm-based polygon

Counties Juniata County, PA, Mifflin County, PA, Perry County, PA

The radar

The State College radar (KCCX), 67 km from the middle of the area, began a volume at 22:55 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 4, 5:52 PM EDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 10.9 hours before the alert went out and 162 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: 243 J/kg
Mixed-layer CIN: -43 J/kg
Mixed-layer LCL: 554 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: 28 m²/s²
0-3 km storm-relative helicity: 41 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 4, 5:54 PM EDT, 1 hour 1 minute earlier.

Area forecast discussion, Aug 4, 5:54 PM EDT, 1 hour 1 minute before

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Hazardous weather outlook, Aug 4, 6:30 PM EDT, 25 minutes before

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In the hours before

Special weather statement, Aug 4, 4:54 PM EDT, 2 hours 1 minute before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
454 PM EDT WED AUG 4 2010

PAZ024-033-042130-
CAMBRIA PA-SOMERSET PA-
454 PM EDT WED AUG 4 2010

...A THUNDERSTORM WILL AFFECT NORTHEASTERN SOMERSET AND SOUTHWESTERN
CAMBRIA COUNTIES...

AT 452 PM EDT...A THUNDERSTORM WAS NEAR NANTY-GLO...MOVING SOUTHEAST
AT 15 MPH.

WIND GUSTS TO 30 MPH ARE POSSIBLE WITH THIS STORM. THIS STORM WILL BE
NEAR VINTONDALE AROUND 500 PM AND EAST CONEMAUGH AROUND 530 PM.

THIS WILL IMPACT THE FOLLOWING MAJOR ROADS...THE JOHNSTOWN
EXPRESSWAY...ROUTE 22...ROUTE 219...STATE ROAD 56.

LAT...LON 4031 7905 4037 7899 4039 7900 4051 7892
      4030 7863 4024 7866 4011 7887

FORECASTER: DEVOIR

Special weather statement, Aug 4, 5:41 PM EDT, 1 hour 14 minutes before

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Special weather statement, Aug 4, 6:18 PM EDT, 37 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 4, 11:09 AM EDT	Heat Advisory	CTP	Adams, Clinton, Columbia, Cumberland, Dauphin, Franklin and 9 more	9 hr
Aug 4, 3:10 PM EDT	Heat Advisory	CTP	Adams, Cumberland, Dauphin, Franklin, Lancaster, Lebanon and 2 more	28 hr
Aug 4, 4:54 PM EDT	Special Weather Statement	CTP	Cambria	36 min
Aug 4, 5:05 PM EDT	Severe Thunderstorm Warning	CTP	Somerset	55 min
Aug 4, 5:41 PM EDT	Special Weather Statement	CTP	Centre, Clearfield, Mifflin, Snyder	34 min
Aug 4, 6:07 PM EDT	Severe Thunderstorm Warning	CTP	Bedford, Blair, Cambria, Somerset	53 min
Aug 4, 6:11 PM EDT	Severe Thunderstorm Warning	CTP	Bedford, Somerset	64 min
Aug 4, 6:18 PM EDT	Special Weather Statement	CTP	Centre, Clearfield, Mifflin, Snyder	57 min
Aug 4, 6:50 PM EDT	Severe Thunderstorm Warning	CTP	Adams, Franklin	55 min
Aug 4, 7:06 PM EDT	Severe Thunderstorm Warning	CTP	Bedford, Fulton	20 min
Aug 4, 7:11 PM EDT	Special Weather Statement	CTP	Clinton, Union	49 min
Aug 4, 7:23 PM EDT	Special Weather Statement	CTP	Adams	67 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.