Alert archive / Indiana / Mesoscale Discussions in 2018

Mesoscale Discussion 584

May 31, 201815 counties in Illinois; 25 counties in Indiana; 4 counties in Kentucky

The Storm Prediction Center issued this mesoscale discussion at May 31, 2018, 10:16 AM CDT for 15 counties in Illinois; 25 counties in Indiana; 4 counties in Kentucky. It was in force for 119 min.

The area

The outline as issued.

The facts

Issued
May 31, 2018, 10:16 AM CDT (15:16 UTC)
Expired
May 31, 2018, 12:15 PM CDT
In force
119 min
Issued by
the Storm Prediction Center
Chance of a watch
60%
All 44 counties

Clay County, IL, Crawford County, IL, Edwards County, IL, Effingham County, IL, Gallatin County, IL, Hamilton County, IL, Jasper County, IL, Jefferson County, IL, Lawrence County, IL, Marion County, IL, Richland County, IL, Saline County, IL, Wabash County, IL, Wayne County, IL, White County, IL, Bartholomew County, IN, Brown County, IN, Crawford County, IN, Daviess County, IN, Dubois County, IN, Gibson County, IN, Greene County, IN, Jackson County, IN, Jennings County, IN, Johnson County, IN, Knox County, IN, Lawrence County, IN, Martin County, IN, Monroe County, IN, Orange County, IN, Owen County, IN, Perry County, IN, Pike County, IN, Posey County, IN, Scott County, IN, Spencer County, IN, Sullivan County, IN, Vanderburgh County, IN, Warrick County, IN, Washington County, IN, Daviess County, KY, Hancock County, KY, Henderson County, KY, Union County, KY

The radar

The Evansville,IN radar (KVWX), 14 km from the middle of the area, began a volume at 15:16 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.

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 3.3 hours before the alert went out and 216 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-pSkew-T log-p diagram, Lincoln, IL at 12:00Z on 2018-05-31Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 828 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Lincoln, IL at 12:00Z on 2018-05-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 140 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
828 J/kg
Mixed-layer CIN
-54 J/kg
Mixed-layer LCL
1157 m above ground
0-6 km bulk shear
31 kt
0-1 km storm-relative helicity
140 m²/s²
0-3 km storm-relative helicity
111 m²/s²
Significant tornado parameter
0.4
Supercell composite
2.6

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.

IssuedProductOfficeCountiesLasted
May 31, 10:31 AM CDTSevere Thunderstorm WatchSPCClark, Clay, Crawford, Cumberland, Edwards, Effingham and 8 more6 hr
May 31, 1:57 PM CDTTornado WatchSPCAlexander, Franklin, Hardin, Jackson, Johnson, Massac and 6 more6 hr
May 31, 4:42 PM CDTMesoscale DiscussionSPCAlexander, Gallatin, Hardin, Jackson, Johnson, Massac and 5 more2 hr
May 31, 1:05 PM CDTMesoscale DiscussionSPCBartholomew, Brown, Clark, Crawford, Daviess, Dearborn and 29 more85 min
May 31, 1:30 PM CDTSevere Thunderstorm WatchSPCDearborn, Fayette, Franklin, Ohio, Ripley, Switzerland and 2 more3 hr
May 31, 2:00 PM CDTMesoscale DiscussionSPCAdams, Allen, Blackford, Boone, Carroll, Cass and 24 more90 min
May 31, 11:26 AM CDTMesoscale DiscussionSPCAnderson, Bath, Bell, Bourbon, Boyle, Breathitt and 39 more64 min
May 31, 2:29 PM CDTMesoscale DiscussionSPCAdair, Allen, Barren, Clinton, Cumberland, Edmonson and 9 more91 min
May 31, 2:56 PM CDTMesoscale DiscussionSPCAnderson, Bath, Bourbon, Boyle, Bracken, Breathitt and 37 more64 min
May 31, 3:27 PM CDTMesoscale DiscussionSPCBell, Clinton, Harlan, Knox, Leslie, Letcher and 3 more93 min
May 31, 3:44 PM CDTMesoscale DiscussionSPCBracken, Lewis, Mason91 min
May 31, 4:31 PM CDTMesoscale DiscussionSPCBell, Clinton, Cumberland, McCreary, Russell, Wayne and 1 more59 min
May 31, 5:46 PM CDTMesoscale DiscussionSPCFulton2 hr

Nearby

Mesoscale Discussions in Indiana, 2018Mesoscale Discussions in Illinois, 2018Mesoscale Discussions in Kentucky, 2018Every 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.