Alert archive / Illinois / Mesoscale Discussions in 2018

Mesoscale Discussion 418

May 14, 20184 states

The Storm Prediction Center issued this mesoscale discussion at May 14, 2018, 6:36 PM CDT for 4 states. It was in force for 84 min.

The area

The outline as issued.

The facts

Issued: May 14, 2018, 6:36 PM CDT (23:36 UTC)
Expired: May 14, 2018, 8:00 PM CDT
In force: 84 min
Issued by: the Storm Prediction Center

All 58 counties

Bond County, IL, Calhoun County, IL, Cass County, IL, Champaign County, IL, Christian County, IL, Clinton County, IL, Cook County, IL, DeWitt County, IL, DuPage County, IL, Fayette County, IL, Ford County, IL, Greene County, IL, Grundy County, IL, Iroquois County, IL, Jersey County, IL, Kane County, IL, Kankakee County, IL, Kendall County, IL, Lake County, IL, LaSalle County, IL, Livingston County, IL, Logan County, IL, Macon County, IL, Macoupin County, IL, Madison County, IL, Marshall County, IL, Mason County, IL, McLean County, IL, Menard County, IL, Montgomery County, IL, Morgan County, IL, Moultrie County, IL, Peoria County, IL, Piatt County, IL, Putnam County, IL, Saint Clair County, IL, Sangamon County, IL, Scott County, IL, Shelby County, IL, Tazewell County, IL, Will County, IL, Woodford County, IL, Elkhart County, IN, Jasper County, IN, Lake County, IN, LaPorte County, IN, Marshall County, IN, Newton County, IN, Porter County, IN, Pulaski County, IN, Saint Joseph County, IN, Starke County, IN, Berrien County, MI, Cass County, MI, Van Buren County, MI, City of Saint Louis, MO, Saint Charles County, MO, Saint Louis County, MO

The radar

The Lincoln radar (KILX), 66 km from the middle of the area, began a volume at 23:35 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 12:00Z, 11.6 hours before the alert went out and 13 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: 962 J/kg
Mixed-layer CIN: -160 J/kg
Mixed-layer LCL: 1462 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: -23 m²/s²
0-3 km storm-relative helicity: 86 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 14, 2:40 AM CDT	Mesoscale Discussion	SPC	Boone, Carroll, Cook, DeKalb, DuPage, Jo Daviess and 6 more	2 hr
May 14, 2:37 PM CDT	Mesoscale Discussion	SPC	Adams, Brown, Bureau, Cass, Champaign, DeWitt and 32 more	53 min
May 14, 2:54 PM CDT	Severe Thunderstorm Watch	SPC	Adams, Bond, Boone, Brown, Bureau, Calhoun and 59 more	6 hr
May 13, 8:00 PM CDT	Mesoscale Discussion	SPC	Andrew, Atchison, Buchanan, Clinton, DeKalb, Gentry and 3 more	3 hr
May 14, 12:54 PM CDT	Mesoscale Discussion	SPC	Adair, Audrain, Bates, Benton, Boone, Caldwell and 39 more	96 min
May 14, 1:20 PM CDT	Severe Thunderstorm Watch	SPC	Adair, Audrain, Barton, Bates, Benton, Boone and 56 more	11 hr

Nearby

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