Alert archive / Ohio / Mesoscale Discussions in 2007

Mesoscale Discussion 1764

August 16, 200719 counties in Indiana; 20 counties in Ohio

The Storm Prediction Center issued this mesoscale discussion at Aug 16, 2007, 12:01 AM EDT for 19 counties in Indiana; 20 counties in Ohio. It was in force for 89 min.

The area

The outline as issued.

The facts

Issued: Aug 16, 2007, 12:01 AM EDT (04:01 UTC)
Expired: Aug 16, 2007, 1:30 AM EDT
In force: 89 min
Issued by: the Storm Prediction Center

All 39 counties

Adams County, IN, Allen County, IN, DeKalb County, IN, Elkhart County, IN, Fulton County, IN, Huntington County, IN, Jay County, IN, Kosciusko County, IN, LaPorte County, IN, Marshall County, IN, Miami County, IN, Noble County, IN, Porter County, IN, Pulaski County, IN, Saint Joseph County, IN, Starke County, IN, Wabash County, IN, Wells County, IN, Whitley County, IN, Allen County, OH, Auglaize County, OH, Crawford County, OH, Defiance County, OH, Hancock County, OH, Hardin County, OH, Henry County, OH, Logan County, OH, Marion County, OH, Mercer County, OH, Paulding 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), 55 km from the middle of the area, began a volume at 04:03 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 601Aug 16, 1:00 AM EDT

The nearest sounding before it

Cncnati-Daytn, OH (KILN), launched 00:00Z, 4.0 hours before the alert went out and 216 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: 216 J/kg
Mixed-layer CIN: -274 J/kg
Mixed-layer LCL: 2096 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: 171 m²/s²
0-3 km storm-relative helicity: 318 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
Aug 15, 10:11 PM EDT	Mesoscale Discussion	SPC	Adams, Allen, Blackford, Cass, DeKalb, Fulton and 16 more	64 min
Aug 15, 10:35 PM EDT	Tornado Watch	SPC	Adams, Allen, Blackford, Cass, DeKalb, Elkhart and 18 more	4 hr
Aug 16, 1:49 PM EDT	Mesoscale Discussion	SPC	Bartholomew, Brown, Clark, Crawford, Daviess, Dubois and 17 more	56 min
Aug 16, 3:00 PM EDT	Severe Thunderstorm Watch	SPC	Bartholomew, Brown, Clark, Clay, Crawford, Daviess and 28 more	4 hr
Aug 16, 4:50 PM EDT	Severe Thunderstorm Watch	SPC	Dearborn, Ohio, Ripley, Switzerland	6 hr
Aug 16, 1:02 AM EDT	Severe Thunderstorm Watch	SPC	Auglaize, Champaign, Clark, Crawford, Darke, Delaware and 21 more	4 hr
Aug 16, 3:21 AM EDT	Mesoscale Discussion	SPC	Athens, Champaign, Clark, Clinton, Crawford, Darke and 32 more	24 min

Nearby

Mesoscale Discussions in Ohio, 2007 Mesoscale Discussions in Indiana, 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.