Alert archive / Indiana / Mesoscale Discussions in 2018

Mesoscale Discussion 589

May 31, 201830 counties in Indiana; Branch County, Saint Joseph County, Michigan; 5 counties in Ohio

The Storm Prediction Center issued this mesoscale discussion at May 31, 2018, 3:00 PM EDT for 30 counties in Indiana; Branch County, Saint Joseph County, Michigan; 5 counties in Ohio. It was in force for 90 min.

The area

The outline as issued.

The facts

Issued: May 31, 2018, 3:00 PM EDT (19:00 UTC)
Expired: May 31, 2018, 4:30 PM EDT
In force: 90 min
Issued by: the Storm Prediction Center
Chance of a watch: 20%

All 37 counties

Adams County, IN, Allen County, IN, Blackford County, IN, Boone County, IN, Carroll County, IN, Cass County, IN, Clinton County, IN, DeKalb County, IN, Delaware County, IN, Elkhart County, IN, Fulton County, IN, Grant County, IN, Hamilton County, IN, Hancock County, IN, Henry County, IN, Howard County, IN, Huntington County, IN, Jay County, IN, Kosciusko County, IN, LaGrange County, IN, Madison County, IN, Marion County, IN, Miami County, IN, Noble County, IN, Randolph County, IN, Steuben County, IN, Tipton County, IN, Wabash County, IN, Wells County, IN, Whitley County, IN, Branch County, MI, Saint Joseph County, MI, Defiance County, OH, Mercer County, OH, Paulding County, OH, Van Wert County, OH, Williams County, OH

The radar

The Northern Indiana radar (KIWX), 50 km from the middle of the area, began a volume at 19:02 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 nearest sounding before it

Cncnati-Daytn, OH (KILN), launched 12:00Z, 7.0 hours before the alert went out and 224 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: 614 J/kg
Mixed-layer CIN: -39 J/kg
Mixed-layer LCL: 712 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 85 m²/s²
0-3 km storm-relative helicity: 108 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.3

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 31, 11:16 AM EDT	Mesoscale Discussion	SPC	Bartholomew, Brown, Crawford, Daviess, Dubois, Gibson and 19 more	119 min
May 31, 11:31 AM EDT	Severe Thunderstorm Watch	SPC	Bartholomew, Brown, Clark, Clay, Crawford, Daviess and 29 more	6 hr
May 31, 2:05 PM EDT	Mesoscale Discussion	SPC	Bartholomew, Brown, Clark, Crawford, Daviess, Dearborn and 29 more	85 min
May 31, 2:30 PM EDT	Severe Thunderstorm Watch	SPC	Dearborn, Fayette, Franklin, Ohio, Ripley, Switzerland and 2 more	3 hr
May 31, 4:44 PM EDT	Mesoscale Discussion	SPC	Adams, Allen, Auglaize, Brown, Champaign, Clark and 15 more	91 min

Nearby

Mesoscale Discussions in Indiana, 2018 Mesoscale Discussions in Ohio, 2018 Mesoscale Discussions in Michigan, 2018 Every mesoscale discussion in 2018

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.