Alert archive / Ohio / Mesoscale Discussions in 2011

Mesoscale Discussion 349

April 4, 201118 counties in Ohio; 6 counties in Pennsylvania; 15 counties in West Virginia

The Storm Prediction Center issued this mesoscale discussion at Apr 4, 2011, 4:12 PM EDT for 18 counties in Ohio; 6 counties in Pennsylvania; 15 counties in West Virginia. It was in force for 63 min.

The area

The outline as issued.

The facts

Issued: Apr 4, 2011, 4:12 PM EDT (20:12 UTC)
Expired: Apr 4, 2011, 5:15 PM EDT
In force: 63 min
Issued by: the Storm Prediction Center

All 39 counties

Athens County, OH, Belmont County, OH, Carroll County, OH, Columbiana County, OH, Coshocton County, OH, Guernsey County, OH, Harrison County, OH, Hocking County, OH, Holmes County, OH, Jefferson County, OH, Meigs County, OH, Monroe County, OH, Morgan County, OH, Muskingum County, OH, Noble County, OH, Perry County, OH, Tuscarawas County, OH, Washington County, OH, Allegheny County, PA, Beaver County, PA, Fayette County, PA, Greene County, PA, Washington County, PA, Westmoreland County, PA, Brooke County, WV, Doddridge County, WV, Hancock County, WV, Harrison County, WV, Marion County, WV, Marshall County, WV, Monongalia County, WV, Ohio County, WV, Pleasants County, WV, Ritchie County, WV, Taylor County, WV, Tyler County, WV, Wetzel County, WV, Wirt County, WV, Wood County, WV

The radar

The Pittsburgh radar (KPBZ), 101 km from the middle of the area, began a volume at 20:13 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

Pittsburgh, PA (KPIT), launched 12:00Z, 8.2 hours before the alert went out and 96 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: 1672 m above ground
0-6 km bulk shear: 57 kt
0-1 km storm-relative helicity: 487 m²/s²
0-3 km storm-relative helicity: 719 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 4, 5:20 AM EDT	Mesoscale Discussion	SPC	Allen, Auglaize, Butler, Champaign, Crawford, Darke and 21 more	25 min
Apr 4, 5:30 AM EDT	Severe Thunderstorm Watch	SPC	Allen, Auglaize, Brown, Butler, Champaign, Clark and 38 more	8 hr
Apr 4, 7:53 AM EDT	Mesoscale Discussion	SPC	Ashland, Ashtabula, Auglaize, Butler, Champaign, Clark and 39 more	2 hr
Apr 4, 12:50 PM EDT	Mesoscale Discussion	SPC	Brown, Butler, Champaign, Clark, Clermont, Clinton and 13 more	25 min
Apr 4, 2:25 PM EDT	Mesoscale Discussion	SPC	Adams, Brown, Lawrence, Scioto	65 min
Apr 4, 3:05 PM EDT	Severe Thunderstorm Watch	SPC	Adams, Athens, Fairfield, Gallia, Highland, Hocking and 11 more	6 hr
Apr 4, 4:49 PM EDT	Mesoscale Discussion	SPC	Lawrence	56 min
Apr 4, 6:00 PM EDT	Mesoscale Discussion	SPC	Lawrence, Monroe, Washington	90 min

Nearby

Mesoscale Discussions in Ohio, 2011 Mesoscale Discussions in West Virginia, 2011 Mesoscale Discussions in Pennsylvania, 2011 Every mesoscale discussion in 2011

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.