Alert archive / Illinois / Mesoscale Discussions in 2016

Mesoscale Discussion 546

May 7, 201623 counties in Illinois; 23 counties in Indiana; 17 counties in Kentucky

The Storm Prediction Center issued this mesoscale discussion at May 7, 2016, 1:45 PM CDT for 23 counties in Illinois; 23 counties in Indiana; 17 counties in Kentucky. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued: May 7, 2016, 1:45 PM CDT (18:45 UTC)
Expired: May 7, 2016, 4:15 PM CDT
In force: 3 hr
Issued by: the Storm Prediction Center
Chance of a watch: 60%

All 63 counties

Bond County, IL, Christian County, IL, Clark County, IL, Clay County, IL, Coles County, IL, Crawford County, IL, Cumberland County, IL, Edwards County, IL, Effingham County, IL, Fayette County, IL, Jasper County, IL, Lawrence County, IL, Macoupin County, IL, Marion County, IL, Montgomery County, IL, Morgan County, IL, Moultrie County, IL, Richland County, IL, Sangamon County, IL, Shelby County, IL, Wabash County, IL, Wayne County, IL, White County, IL, Clark County, IN, Crawford County, IN, Daviess County, IN, Dubois County, IN, Floyd County, IN, Gibson County, IN, Greene County, IN, Harrison County, IN, Jackson County, IN, Jefferson County, IN, Knox County, IN, Lawrence County, IN, Martin County, IN, Orange 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, Anderson County, KY, Breckinridge County, KY, Bullitt County, KY, Carroll County, KY, Daviess County, KY, Hancock County, KY, Hardin County, KY, Henry County, KY, Jefferson County, KY, Larue County, KY, Meade County, KY, Nelson County, KY, Oldham County, KY, Shelby County, KY, Spencer County, KY, Trimble County, KY, Washington County, KY

The radar

The Evansville,IN radar (KVWX), 72 km from the middle of the area, began a volume at 18:46 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Severe Thunderstorm Watch 145May 7, 3:40 PM CDT

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 6.8 hours before the alert went out and 157 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: 1 J/kg
Mixed-layer CIN: -438 J/kg
Mixed-layer LCL: 2063 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 228 m²/s²
0-3 km storm-relative helicity: 255 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 7, 3:42 PM CDT	Severe Thunderstorm Watch	SPC	Bond, Calhoun, Christian, Clark, Clay, Clinton and 26 more	5 hr
May 7, 5:32 PM CDT	Mesoscale Discussion	SPC	Bond, Calhoun, Christian, Clark, Clay, Clinton and 40 more	118 min
May 7, 6:08 PM CDT	Severe Thunderstorm Watch	SPC	Franklin, Gallatin, Saline	6 hr

Nearby

Mesoscale Discussions in Illinois, 2016 Mesoscale Discussions in Indiana, 2016 Mesoscale Discussions in Kentucky, 2016 Every mesoscale discussion in 2016

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.