Alert archive / Ohio / Mesoscale Discussions in 2007

Mesoscale Discussion 1701

August 9, 200731 counties in Ohio; 10 counties in Pennsylvania; 4 counties in West Virginia

The Storm Prediction Center issued this mesoscale discussion at Aug 9, 2007, 5:03 PM EDT for 31 counties in Ohio; 10 counties in Pennsylvania; 4 counties in West Virginia. It was in force for 87 min.

The area

The outline as issued.

The facts

Issued: Aug 9, 2007, 5:03 PM EDT (21:03 UTC)
Expired: Aug 9, 2007, 6:30 PM EDT
In force: 87 min
Issued by: the Storm Prediction Center

All 45 counties

Ashland County, OH, Belmont County, OH, Carroll County, OH, Columbiana County, OH, Coshocton County, OH, Crawford County, OH, Cuyahoga County, OH, Delaware County, OH, Geauga County, OH, Guernsey County, OH, Harrison County, OH, Holmes County, OH, Huron County, OH, Jefferson County, OH, Knox County, OH, Licking County, OH, Logan County, OH, Mahoning County, OH, Marion County, OH, Medina County, OH, Morrow County, OH, Muskingum County, OH, Portage County, OH, Richland County, OH, Shelby County, OH, Stark County, OH, Summit County, OH, Trumbull County, OH, Tuscarawas County, OH, Union County, OH, Wayne County, OH, Allegheny County, PA, Armstrong County, PA, Beaver County, PA, Butler County, PA, Fayette County, PA, Greene County, PA, Lawrence County, PA, Mercer County, PA, Washington County, PA, Westmoreland County, PA, Brooke County, WV, Hancock County, WV, Marshall County, WV, Ohio County, WV

The radar

The Cleveland radar (KCLE), 95 km from the middle of the area, began a volume at 21:04 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, 9.1 hours before the alert went out and 146 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: 685 J/kg
Mixed-layer CIN: -50 J/kg
Mixed-layer LCL: 717 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 124 m²/s²
0-3 km storm-relative helicity: 218 m²/s²
Significant tornado parameter: 0.5
Supercell composite: 3.6

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
Aug 9, 11:54 AM EDT	Mesoscale Discussion	SPC	Allen, Ashland, Auglaize, Belmont, Carroll, Champaign and 48 more	2 hr
Aug 9, 1:22 PM EDT	Severe Thunderstorm Watch	SPC	Ashland, Ashtabula, Auglaize, Belmont, Carroll, Champaign and 43 more	7 hr
Aug 9, 3:05 PM EDT	Mesoscale Discussion	SPC	Darke, Mercer, Preble	85 min
Aug 9, 7:23 PM EDT	Mesoscale Discussion	SPC	Adams, Allen, Ashland, Athens, Auglaize, Belmont and 68 more	67 min
Aug 9, 8:47 AM EDT	Mesoscale Discussion	SPC	Adams, Bedford, Cumberland, Franklin, Fulton, Huntingdon and 1 more	58 min
Aug 9, 9:47 AM EDT	Severe Thunderstorm Watch	SPC	Adams, Bedford, Blair, Cambria, Centre, Clearfield and 13 more	6 hr
Aug 9, 2:41 PM EDT	Mesoscale Discussion	SPC	Bedford, Cambria, Fayette, Franklin, Fulton, Indiana and 2 more	94 min

Nearby

Mesoscale Discussions in Ohio, 2007 Mesoscale Discussions in Pennsylvania, 2007 Mesoscale Discussions in West Virginia, 2007 Every mesoscale discussion in 2007

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.