Alert archive / Indiana / Mesoscale Discussions in 2013

Mesoscale Discussion 439

April 11, 201326 counties in Indiana

The Storm Prediction Center issued this mesoscale discussion at Apr 11, 2013, 12:51 AM EDT for 26 counties in Indiana. It was in force for 84 min.

The area

The outline as issued.

The facts

Issued: Apr 11, 2013, 12:51 AM EDT (04:51 UTC)
Expired: Apr 11, 2013, 2:15 AM EDT
In force: 84 min
Issued by: the Storm Prediction Center

All 26 counties

Adams County, IN, Blackford County, IN, Boone County, IN, Carroll County, IN, Cass County, IN, Clinton County, IN, Delaware County, IN, Grant County, IN, Hamilton County, IN, Hancock County, IN, Hendricks County, IN, Henry County, IN, Howard County, IN, Huntington County, IN, Jay County, IN, Madison County, IN, Marion County, IN, Miami County, IN, Montgomery County, IN, Putnam County, IN, Randolph County, IN, Tippecanoe County, IN, Tipton County, IN, Wabash County, IN, Wells County, IN, White County, IN

The radar

The Indianapolis radar (KIND), 73 km from the middle of the area, began a volume at 04:52 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, 4.9 hours before the alert went out and 187 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 587 m above ground
0-6 km bulk shear: 76 kt
0-1 km storm-relative helicity: 140 m²/s²
0-3 km storm-relative helicity: 218 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.2

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
Apr 10, 9:00 PM EDT	Mesoscale Discussion	SPC	Adams, Allen, Benton, Blackford, Boone, Carroll and 40 more	2 hr
Apr 10, 9:28 PM EDT	Tornado Watch	SPC	Daviess, Gibson, Greene, Knox, Pike, Posey and 3 more	7 hr
Apr 11, 12:08 AM EDT	Mesoscale Discussion	SPC	Daviess, Gibson, Knox, Pike, Posey, Vanderburgh	97 min

Nearby

Mesoscale Discussions in Indiana, 2013 Every mesoscale discussion in 2013

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.