Alert archive / Indiana / Mesoscale Discussions in 2007

Mesoscale Discussion 1876

August 23, 200710 counties in Indiana; 5 counties in Ohio

The Storm Prediction Center issued this mesoscale discussion at Aug 23, 2007, 10:54 PM EDT for 10 counties in Indiana; 5 counties in Ohio. It was in force for 66 min.

The area

The outline as issued.

The facts

Issued: Aug 23, 2007, 10:54 PM EDT (02:54 UTC)
Expired: Aug 24, 2007, 12:00 AM EDT
In force: 66 min
Issued by: the Storm Prediction Center

Counties Allen County, IN, DeKalb County, IN, Elkhart County, IN, Kosciusko County, IN, LaGrange County, IN, Marshall County, IN, Noble County, IN, Saint Joseph County, IN, Steuben County, IN, Whitley County, IN, Defiance County, OH, Fulton County, OH, Henry County, OH, Paulding County, OH, Williams County, OH

The radar

The Northern Indiana radar (KIWX), 43 km from the middle of the area, began a volume at 02:55 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

Detroit, MI (KDTX), launched 00:00Z, 2.9 hours before the alert went out and 203 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: 1685 J/kg
Mixed-layer CIN: -5 J/kg
Mixed-layer LCL: 1164 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 159 m²/s²
0-3 km storm-relative helicity: 215 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 6.0

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 23, 8:10 PM EDT	Severe Thunderstorm Watch	SPC	Benton, Jasper, Lake, Newton, Porter	5 hr
Aug 23, 8:30 PM EDT	Mesoscale Discussion	SPC	DeKalb, Elkhart, Kosciusko, LaGrange, Marshall, Noble and 2 more	90 min
Aug 24, 3:44 PM EDT	Mesoscale Discussion	SPC	Adams, Allen, Bartholomew, Benton, Blackford, Boone and 57 more	91 min
Aug 24, 4:04 PM EDT	Severe Thunderstorm Watch	SPC	Adams, Allen, Benton, Blackford, Boone, Carroll and 46 more	7 hr
Aug 24, 6:50 PM EDT	Mesoscale Discussion	SPC	Adams, Allen, Bartholomew, Benton, Blackford, Boone and 71 more	85 min

Nearby

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