Alert archive / Indiana / Mesoscale Discussions in 2007

Mesoscale Discussion 811

May 15, 200714 counties in Illinois; 22 counties in Indiana

The Storm Prediction Center issued this mesoscale discussion at May 15, 2007, 5:25 PM CDT for 14 counties in Illinois; 22 counties in Indiana. It was in force for 35 min.

The area

The outline as issued.

The facts

Issued: May 15, 2007, 5:25 PM CDT (22:25 UTC)
Expired: May 15, 2007, 6:00 PM CDT
In force: 35 min
Issued by: the Storm Prediction Center

All 36 counties

Clark County, IL, Clay County, IL, Coles County, IL, Crawford County, IL, Cumberland County, IL, Edgar County, IL, Edwards County, IL, Effingham County, IL, Jasper County, IL, Lawrence County, IL, Marion County, IL, Richland County, IL, Wabash County, IL, Wayne County, IL, Boone County, IN, Brown County, IN, Clay County, IN, Daviess County, IN, Gibson County, IN, Greene County, IN, Hendricks County, IN, Johnson County, IN, Knox County, IN, Lawrence County, IN, Marion County, IN, Martin County, IN, Monroe County, IN, Montgomery County, IN, Morgan County, IN, Owen County, IN, Parke County, IN, Pike County, IN, Putnam County, IN, Sullivan County, IN, Vermillion County, IN, Vigo County, IN

The radar

The Evansville,IN radar (KVWX), 100 km from the middle of the area, began a volume at 22:26 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

Lincoln, IL (KILX), launched 12:00Z, 10.4 hours before the alert went out and 156 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: 20 J/kg
Mixed-layer CIN: -273 J/kg
Mixed-layer LCL: 1998 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: -6 m²/s²
0-3 km storm-relative helicity: 49 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
May 15, 11:02 AM CDT	Severe Thunderstorm Watch	SPC	Adams, Bond, Brown, Calhoun, Cass, Champaign and 46 more	7 hr
May 15, 12:15 PM CDT	Mesoscale Discussion	SPC	Champaign, Clark, Coles, Crawford, Cumberland, Douglas and 5 more	90 min
May 15, 12:53 PM CDT	Severe Thunderstorm Watch	SPC	Ford, Iroquois, Kankakee, Livingston	7 hr
May 15, 3:30 PM CDT	Mesoscale Discussion	SPC	Bond, Champaign, Christian, Clay, Clinton, Coles and 32 more	90 min
May 15, 3:32 PM CDT	Mesoscale Discussion	SPC	Ford, Iroquois, Kankakee, Vermilion	58 min
May 15, 4:58 PM CDT	Mesoscale Discussion	SPC	Alexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 14 more	62 min
May 15, 6:25 PM CDT	Mesoscale Discussion	SPC	Adams, Allen, Blackford, DeKalb, Grant, Huntington and 6 more	65 min

Nearby

Mesoscale Discussions in Indiana, 2007 Mesoscale Discussions in Illinois, 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.