Alert archive / Ohio / Mesoscale Discussions in 2015

Mesoscale Discussion 1463

July 18, 201526 counties in Indiana; 27 counties in Ohio

The Storm Prediction Center issued this mesoscale discussion at Jul 18, 2015, 1:26 PM EDT for 26 counties in Indiana; 27 counties in Ohio. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Jul 18, 2015, 1:26 PM EDT (17:26 UTC)
Expired: Jul 18, 2015, 3:30 PM EDT
In force: 2 hr
Issued by: the Storm Prediction Center
Chance of a watch: 40%

All 53 counties

Adams County, IN, Allen County, IN, Blackford County, IN, Carroll County, IN, Cass County, IN, Clinton County, IN, DeKalb County, IN, Delaware County, IN, Fulton County, IN, Grant County, IN, Henry County, IN, Howard County, IN, Huntington County, IN, Jay County, IN, Kosciusko County, IN, Madison County, IN, Marshall County, IN, Miami County, IN, Pulaski County, IN, Randolph County, IN, Starke County, IN, Tipton County, IN, Wabash County, IN, Wayne County, IN, Wells County, IN, Whitley County, IN, Allen County, OH, Auglaize County, OH, Champaign County, OH, Clark County, OH, Darke County, OH, Defiance County, OH, Fulton County, OH, Greene County, OH, Hancock County, OH, Hardin County, OH, Henry County, OH, Logan County, OH, Marion County, OH, Mercer County, OH, Miami County, OH, Montgomery County, OH, Paulding County, OH, Preble County, OH, Putnam County, OH, Sandusky County, OH, Seneca County, OH, Shelby County, OH, Union County, OH, Van Wert County, OH, Williams County, OH, Wood County, OH, Wyandot County, OH

The radar

The Northern Indiana radar (KIWX), 105 km from the middle of the area, began a volume at 17:28 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.

The nearest sounding before it

Cncnati-Daytn, OH (KILN), launched 12:00Z, 5.4 hours before the alert went out and 172 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: 632 J/kg
Mixed-layer CIN: -94 J/kg
Mixed-layer LCL: 934 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 68 m²/s²
0-3 km storm-relative helicity: 30 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 18, 2:31 PM EDT	Tornado Watch	SPC	Benton, Jasper, Lake, Newton, Porter	5 hr
Jul 18, 4:21 PM EDT	Mesoscale Discussion	SPC	Allen, Carroll, Cass, DeKalb, Elkhart, Fulton and 16 more	84 min
Jul 18, 4:59 PM EDT	Tornado Watch	SPC	Adams, Allen, Blackford, Cass, DeKalb, Elkhart and 18 more	5 hr
Jul 18, 6:43 PM EDT	Mesoscale Discussion	SPC	Allen, Cass, DeKalb, Elkhart, Fulton, Huntington and 17 more	92 min

Nearby

Mesoscale Discussions in Ohio, 2015 Mesoscale Discussions in Indiana, 2015 Every mesoscale discussion in 2015

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.