Alert archive / Ohio / Mesoscale Discussions in 2011

Mesoscale Discussion 1687

July 22, 201135 counties in Indiana; Hillsdale County, Michigan; 49 counties in Ohio

The Storm Prediction Center issued this mesoscale discussion at Jul 22, 2011, 12:50 PM EDT for 35 counties in Indiana; Hillsdale County, Michigan; 49 counties in Ohio. It was in force for 55 min.

The area

The outline as issued.

The facts

Issued: Jul 22, 2011, 12:50 PM EDT (16:50 UTC)
Expired: Jul 22, 2011, 1:45 PM EDT
In force: 55 min
Issued by: the Storm Prediction Center

All 85 counties

Adams County, IN, Allen County, IN, Blackford County, IN, Boone County, IN, Carroll County, IN, Cass County, IN, Clinton County, IN, DeKalb County, IN, Delaware County, IN, Elkhart County, IN, Fayette County, IN, Fulton County, IN, Grant County, IN, Hamilton County, IN, Hancock County, IN, Henry County, IN, Howard County, IN, Huntington County, IN, Jay County, IN, Kosciusko County, IN, LaGrange County, IN, Madison County, IN, Marion County, IN, Marshall County, IN, Miami County, IN, Noble County, IN, Randolph County, IN, Rush County, IN, Steuben County, IN, Tipton County, IN, Union County, IN, Wabash County, IN, Wayne County, IN, Wells County, IN, Whitley County, IN, Hillsdale County, MI, Allen County, OH, Ashland County, OH, Auglaize County, OH, Champaign County, OH, Clark County, OH, Clinton County, OH, Coshocton County, OH, Crawford County, OH, Darke County, OH, Defiance County, OH, Delaware County, OH, Fairfield County, OH, Fayette County, OH, Franklin County, OH, Fulton County, OH, Greene County, OH, Guernsey County, OH, Hancock County, OH, Hardin County, OH, Henry County, OH, Hocking County, OH, Holmes County, OH, Huron County, OH, Knox County, OH, Licking County, OH, Logan County, OH, Madison County, OH, Marion County, OH, Mercer County, OH, Miami County, OH, Montgomery County, OH, Morgan County, OH, Morrow County, OH, Muskingum County, OH, Paulding County, OH, Perry County, OH, Pickaway County, OH, Preble County, OH, Putnam County, OH, Richland County, OH, Sandusky County, OH, Seneca County, OH, Shelby County, OH, Union County, OH, Van Wert County, OH, Wayne County, OH, Williams County, OH, Wood County, OH, Wyandot County, OH

The radar

The Cincinnati radar (KILN), 120 km from the middle of the area, began a volume at 16:53 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 watches that followed

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

Severe Thunderstorm Watch 670Jul 22, 1:15 PM EDT

The nearest sounding before it

Cncnati-Daytn, OH (KILN), launched 12:00Z, 4.8 hours before the alert went out and 120 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: 3503 J/kg
Mixed-layer CIN: -31 J/kg
Mixed-layer LCL: 912 m above ground
0-6 km bulk shear: 5 kt
0-1 km storm-relative helicity: -6 m²/s²
0-3 km storm-relative helicity: 25 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 22, 11:20 AM EDT	Mesoscale Discussion	SPC	Adams, Allen, Blackford, Boone, Carroll, Cass and 29 more	55 min
Jul 22, 1:14 PM EDT	Severe Thunderstorm Watch	SPC	Adams, Allen, Blackford, Cass, DeKalb, Elkhart and 18 more	7 hr
Jul 22, 4:32 PM EDT	Mesoscale Discussion	SPC	Jay, Randolph, Wayne	88 min
Jul 22, 3:17 PM EDT	Mesoscale Discussion	SPC	Belmont, Carroll, Columbiana, Guernsey, Harrison, Jefferson and 4 more	58 min
Jul 22, 5:19 PM EDT	Mesoscale Discussion	SPC	Belmont, Carroll, Columbiana, Coshocton, Geauga, Guernsey and 11 more	56 min
Jul 22, 5:37 PM EDT	Severe Thunderstorm Watch	SPC	Belmont, Carroll, Columbiana, Coshocton, Guernsey, Harrison and 5 more	4 hr
Jul 22, 5:59 PM EDT	Mesoscale Discussion	SPC	Gallia, Lawrence	2 hr
Jul 22, 7:10 PM EDT	Mesoscale Discussion	SPC	Clark, Clinton, Coshocton, Delaware, Fairfield, Fayette and 14 more	35 min

Nearby

Mesoscale Discussions in Ohio, 2011 Mesoscale Discussions in Indiana, 2011 Mesoscale Discussions in Michigan, 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.