Alert archive / Missouri / Mesoscale Discussions in 2017

Mesoscale Discussion 1026

June 14, 201729 counties in Illinois; 44 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at Jun 14, 2017, 12:40 PM CDT for 29 counties in Illinois; 44 counties in Missouri. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued: Jun 14, 2017, 12:40 PM CDT (17:40 UTC)
Expired: Jun 14, 2017, 3:15 PM CDT
In force: 3 hr
Issued by: the Storm Prediction Center
Chance of a watch: 60%

All 73 counties

Bond County, IL, Calhoun County, IL, Christian County, IL, Clay County, IL, Clinton County, IL, Effingham County, IL, Fayette County, IL, Franklin County, IL, Greene County, IL, Hamilton County, IL, Jackson County, IL, Jefferson County, IL, Jersey County, IL, Macoupin County, IL, Madison County, IL, Marion County, IL, Monroe County, IL, Montgomery County, IL, Morgan County, IL, Perry County, IL, Pike County, IL, Randolph County, IL, Saint Clair County, IL, Scott County, IL, Shelby County, IL, Union County, IL, Washington County, IL, Wayne County, IL, Williamson County, IL, Audrain County, MO, Benton County, MO, Boone County, MO, Callaway County, MO, Camden County, MO, Cape Girardeau County, MO, City of Saint Louis, MO, Cole County, MO, Cooper County, MO, Crawford County, MO, Dent County, MO, Franklin County, MO, Gasconade County, MO, Henry County, MO, Hickory County, MO, Howard County, MO, Iron County, MO, Jefferson County, MO, Johnson County, MO, Laclede County, MO, Lafayette County, MO, Lincoln County, MO, Madison County, MO, Maries County, MO, Miller County, MO, Moniteau County, MO, Monroe County, MO, Montgomery County, MO, Morgan County, MO, Osage County, MO, Perry County, MO, Pettis County, MO, Phelps County, MO, Pike County, MO, Pulaski County, MO, Ralls County, MO, Randolph County, MO, Saint Charles County, MO, Saint Francois County, MO, Saint Louis County, MO, Sainte Genevieve County, MO, Saline County, MO, Warren County, MO, Washington County, MO

The radar

The St Louis radar (KLSX), 61 km from the middle of the area, began a volume at 17:41 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 329Jun 14, 1:05 PM CDT

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 5.7 hours before the alert went out and 286 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: 971 J/kg
Mixed-layer CIN: -88 J/kg
Mixed-layer LCL: 1054 m above ground
0-6 km bulk shear: 4 kt
0-1 km storm-relative helicity: -9 m²/s²
0-3 km storm-relative helicity: 13 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
Jun 14, 12:06 PM CDT	Mesoscale Discussion	SPC	Boone, Bureau, Carroll, Cook, DeKalb, DuPage and 27 more	2 hr
Jun 14, 12:40 PM CDT	Severe Thunderstorm Watch	SPC	Boone, Bureau, Carroll, Cook, DeKalb, DuPage and 35 more	7 hr
Jun 14, 12:44 PM CDT	Mesoscale Discussion	SPC	Champaign, Clark, Coles, DeWitt, Douglas, Edgar and 5 more	3 hr
Jun 14, 1:04 PM CDT	Severe Thunderstorm Watch	SPC	Adams, Bond, Brown, Calhoun, Cass, Champaign and 35 more	9 hr
Jun 14, 3:02 PM CDT	Mesoscale Discussion	SPC	Cook, Lake	118 min
Jun 14, 4:59 PM CDT	Mesoscale Discussion	SPC	Cook, DuPage, Grundy, Iroquois, Kane, Kankakee and 4 more	91 min
Jun 14, 6:11 PM CDT	Mesoscale Discussion	SPC	Adams, Bond, Brown, Calhoun, Cass, Christian and 22 more	64 min
Jun 13, 9:36 PM CDT	Mesoscale Discussion	SPC	Atchison	54 min

Nearby

Mesoscale Discussions in Missouri, 2017 Mesoscale Discussions in Illinois, 2017 Every mesoscale discussion in 2017

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.