Alert archive / Illinois / Mesoscale Discussions in 2020

Mesoscale Discussion 614

May 16, 20204 states

The Storm Prediction Center issued this mesoscale discussion at May 16, 2020, 3:38 PM CDT for 4 states. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued: May 16, 2020, 3:38 PM CDT (20:38 UTC)
Expired: May 16, 2020, 6:15 PM CDT
In force: 3 hr
Issued by: the Storm Prediction Center
Concerning: Severe potential...watch unlikely
Chance of a watch: 5%

All 41 counties

Bond County, IL, Christian County, IL, Clay County, IL, Clinton County, IL, Edwards County, IL, Effingham County, IL, Fayette County, IL, Franklin County, IL, Gallatin County, IL, Greene County, IL, Hamilton County, IL, Jasper County, IL, Jefferson County, IL, Jersey County, IL, Lawrence County, IL, Macoupin County, IL, Madison County, IL, Marion County, IL, Menard County, IL, Montgomery County, IL, Morgan County, IL, Perry County, IL, Randolph County, IL, Richland County, IL, Saint Clair County, IL, Saline County, IL, Sangamon County, IL, Shelby County, IL, Wabash County, IL, Washington County, IL, Wayne County, IL, White County, IL, Williamson County, IL, Gibson County, IN, Posey County, IN, Vanderburgh County, IN, Warrick County, IN, Henderson County, KY, Union County, KY, Webster County, KY, City of Saint Louis, MO

The radar

The Evansville,IN radar (KVWX), 112 km from the middle of the area, began a volume at 20:37 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, 8.6 hours before the alert went out and 176 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 818 m above ground
0-6 km bulk shear: 13 kt
0-1 km storm-relative helicity: 25 m²/s²
0-3 km storm-relative helicity: 71 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 16, 6:45 PM CDT	Mesoscale Discussion	SPC	Atchison, Harrison, Mercer, Nodaway, Putnam, Schuyler and 2 more	90 min

Nearby

Mesoscale Discussions in Illinois, 2020 Mesoscale Discussions in Indiana, 2020 Mesoscale Discussions in Kentucky, 2020 Every mesoscale discussion in 2020

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.