Alert archive / Missouri / Mesoscale Discussions in 2018

Mesoscale Discussion 623

June 2, 201811 counties in Illinois; 33 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at Jun 2, 2018, 9:12 AM CDT for 11 counties in Illinois; 33 counties in Missouri. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Jun 2, 2018, 9:12 AM CDT (14:12 UTC)
Expired: Jun 2, 2018, 11:15 AM CDT
In force: 2 hr
Issued by: the Storm Prediction Center

All 44 counties

Clinton County, IL, Franklin County, IL, Jackson County, IL, Jefferson County, IL, Monroe County, IL, Perry County, IL, Randolph County, IL, Saint Clair County, IL, Union County, IL, Washington County, IL, Williamson County, IL, Benton County, MO, Callaway County, MO, Camden County, MO, Cape Girardeau County, MO, Cedar County, MO, City of Saint Louis, MO, Cole County, MO, Crawford County, MO, Dade County, MO, Dallas County, MO, Franklin County, MO, Gasconade County, MO, Hickory County, MO, Iron County, MO, Jefferson County, MO, Laclede County, MO, Lincoln County, MO, Maries County, MO, Miller County, MO, Moniteau County, MO, Montgomery County, MO, Morgan County, MO, Osage County, MO, Perry County, MO, Phelps County, MO, Polk County, MO, Pulaski County, MO, Saint Charles County, MO, Saint Francois County, MO, Saint Louis County, MO, Sainte Genevieve County, MO, Warren County, MO, Washington County, MO

The radar

The St Louis radar (KLSX), 99 km from the middle of the area, began a volume at 14:13 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

Springfield, MO (KSGF), launched 12:00Z, 2.2 hours before the alert went out and 240 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: 2602 J/kg
Mixed-layer CIN: -176 J/kg
Mixed-layer LCL: 909 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 26 m²/s²
0-3 km storm-relative helicity: 63 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

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 2, 3:42 PM CDT	Mesoscale Discussion	SPC	Alexander, Pulaski	2 hr
Jun 2, 6:55 PM CDT	Mesoscale Discussion	SPC	Champaign, Clark, Coles, Crawford, Cumberland, DeWitt and 15 more	2 hr
Jun 2, 12:50 AM CDT	Mesoscale Discussion	SPC	Andrew, Atchison, Bates, Buchanan, Cass, Clay and 10 more	55 min
Jun 2, 5:48 AM CDT	Severe Thunderstorm Watch	SPC	Barton, Bates, Benton, Camden, Carroll, Cass and 25 more	4 hr
Jun 2, 1:33 PM CDT	Mesoscale Discussion	SPC	Howell, Oregon, Ozark, Ripley	117 min
Jun 2, 2:19 PM CDT	Severe Thunderstorm Watch	SPC	Butler, Carter, Douglas, Dunklin, Howell, Mississippi and 11 more	10 hr
Jun 2, 6:31 PM CDT	Mesoscale Discussion	SPC	Butler, Carter, Dunklin, Howell, New Madrid, Oregon and 6 more	89 min

Nearby

Mesoscale Discussions in Missouri, 2018 Mesoscale Discussions in Illinois, 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.