Alert archive / Indiana / Mesoscale Discussions in 2013

Mesoscale Discussion 912

May 31, 20138 counties in Indiana

The Storm Prediction Center issued this mesoscale discussion at May 31, 2013, 7:00 PM EDT for 8 counties in Indiana. It was in force for 60 min.

The area

The outline as issued.

The facts

Issued: May 31, 2013, 7:00 PM EDT (23:00 UTC)
Expired: May 31, 2013, 8:00 PM EDT
In force: 60 min
Issued by: the Storm Prediction Center
Chance of a watch: 40%

Counties Fulton County, IN, Huntington County, IN, Kosciusko County, IN, Marshall County, IN, Noble County, IN, Starke County, IN, Wabash County, IN, Whitley County, IN

The radar

The Northern Indiana radar (KIWX), 37 km from the middle of the area, began a volume at 23:02 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 264May 31, 7:20 PM EDT

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 11.0 hours before the alert went out and 242 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: 8 J/kg
Mixed-layer CIN: -299 J/kg
Mixed-layer LCL: 1021 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 215 m²/s²
0-3 km storm-relative helicity: 222 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

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 30, 11:03 PM EDT	Mesoscale Discussion	SPC	Benton, Jasper, Lake, Newton, Porter	87 min
May 31, 1:26 PM EDT	Mesoscale Discussion	SPC	Adams, Bartholomew, Blackford, Brown, Clark, Crawford and 25 more	94 min
May 31, 7:19 PM EDT	Severe Thunderstorm Watch	SPC	Adams, Allen, Blackford, Cass, DeKalb, Elkhart and 18 more	4 hr

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.