Alert archive / Indiana / Mesoscale Discussions in 2017

Mesoscale Discussion 693

May 10, 20175 counties in Illinois; 30 counties in Indiana

The Storm Prediction Center issued this mesoscale discussion at May 10, 2017, 9:42 PM CDT for 5 counties in Illinois; 30 counties in Indiana. It was in force for 63 min.

The area

The outline as issued.

The facts

Issued: May 10, 2017, 9:42 PM CDT (02:42 UTC)
Expired: May 10, 2017, 10:45 PM CDT
In force: 63 min
Issued by: the Storm Prediction Center

All 35 counties

Clark County, IL, Crawford County, IL, Cumberland County, IL, Effingham County, IL, Jasper County, IL, Bartholomew County, IN, Boone County, IN, Brown County, IN, Clay County, IN, Clinton County, IN, Decatur County, IN, Delaware County, IN, Fountain County, IN, Greene County, IN, Hamilton County, IN, Hancock County, IN, Hendricks County, IN, Henry County, IN, Johnson County, IN, Madison County, IN, Marion County, IN, Monroe County, IN, Montgomery County, IN, Morgan County, IN, Owen County, IN, Parke County, IN, Putnam County, IN, Rush County, IN, Shelby County, IN, Sullivan County, IN, Tippecanoe County, IN, Tipton County, IN, Vermillion County, IN, Vigo County, IN, Warren County, IN

The radar

The Indianapolis radar (KIND), 84 km from the middle of the area, began a volume at 02:46 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 00:00Z, 2.7 hours before the alert went out and 138 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: 442 J/kg
Mixed-layer CIN: -26 J/kg
Mixed-layer LCL: 1634 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 104 m²/s²
0-3 km storm-relative helicity: 140 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 3.0

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 10, 7:07 PM CDT	Severe Thunderstorm Watch	SPC	Champaign, Christian, Clark, Coles, Cumberland, Douglas and 6 more	5 hr
May 11, 12:58 PM CDT	Mesoscale Discussion	SPC	Gallatin, Hamilton, Hardin, Johnson, Massac, Pope and 4 more	3 hr

Nearby

Mesoscale Discussions in Indiana, 2017 Mesoscale Discussions in Illinois, 2017 Every mesoscale discussion in 2017

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.