Alert archive / Ohio / Mesoscale Discussions in 2011

Mesoscale Discussion 1585

July 11, 201127 counties in Ohio; 9 counties in West Virginia

The Storm Prediction Center issued this mesoscale discussion at Jul 11, 2011, 8:51 PM EDT for 27 counties in Ohio; 9 counties in West Virginia. It was in force for 54 min.

The area

The outline as issued.

The facts

Issued: Jul 11, 2011, 8:51 PM EDT (00:51 UTC)
Expired: Jul 11, 2011, 9:45 PM EDT
In force: 54 min
Issued by: the Storm Prediction Center

All 36 counties

Athens County, OH, Belmont County, OH, Coshocton County, OH, Delaware County, OH, Fairfield County, OH, Franklin County, OH, Gallia County, OH, Guernsey County, OH, Harrison County, OH, Hocking County, OH, Holmes County, OH, Jackson County, OH, Knox County, OH, Licking County, OH, Meigs County, OH, Monroe County, OH, Morgan County, OH, Morrow County, OH, Muskingum County, OH, Noble County, OH, Perry County, OH, Pickaway County, OH, Pike County, OH, Ross County, OH, Tuscarawas County, OH, Vinton County, OH, Washington County, OH, Jackson County, WV, Marshall County, WV, Mason County, WV, Ohio County, WV, Pleasants County, WV, Ritchie County, WV, Tyler County, WV, Wirt County, WV, Wood County, WV

The watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Severe Thunderstorm Watch 635Jul 11, 9:20 PM EDT

The nearest sounding before it

Pittsburgh, PA (KPIT), launched 00:00Z, 0.9 hours before the alert went out and 164 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: 112 J/kg
Mixed-layer CIN: -415 J/kg
Mixed-layer LCL: 1656 m above ground
0-6 km bulk shear: 50 kt
0-1 km storm-relative helicity: 94 m²/s²
0-3 km storm-relative helicity: 205 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
Jul 11, 9:22 PM EDT	Severe Thunderstorm Watch	SPC	Adams, Athens, Belmont, Brown, Butler, Clark and 32 more	3 hr
Jul 11, 11:22 PM EDT	Mesoscale Discussion	SPC	Boone, Cabell, Lincoln, Logan, Mingo, Wayne	83 min

Nearby

Mesoscale Discussions in Ohio, 2011 Mesoscale Discussions in West Virginia, 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.