Alert archive / Missouri / Mesoscale Discussions in 2018

Mesoscale Discussion 734

June 14, 2018Madison County, Monroe County, Saint Clair County, Illinois; 20 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at Jun 14, 2018, 5:18 PM CDT for Madison County, Monroe County, Saint Clair County, Illinois; 20 counties in Missouri. It was in force for 57 min.

The area

The outline as issued.

The facts

Issued: Jun 14, 2018, 5:18 PM CDT (22:18 UTC)
Expired: Jun 14, 2018, 6:15 PM CDT
In force: 57 min
Issued by: the Storm Prediction Center
Chance of a watch: 5%

All 23 counties

Madison County, IL, Monroe County, IL, Saint Clair County, IL, City of Saint Louis, MO, Cole County, MO, Cooper County, MO, Crawford County, MO, Franklin County, MO, Gasconade County, MO, Iron County, MO, Jefferson County, MO, Maries County, MO, Miller County, MO, Moniteau County, MO, Morgan County, MO, Osage County, MO, Phelps 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), 55 km from the middle of the area, began a volume at 22:19 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, 10.3 hours before the alert went out and 285 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: 2648 J/kg
Mixed-layer CIN: -41 J/kg
Mixed-layer LCL: 1120 m above ground
0-6 km bulk shear: 5 kt
0-1 km storm-relative helicity: -10 m²/s²
0-3 km storm-relative helicity: 48 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, 1:17 PM CDT	Mesoscale Discussion	SPC	Adams, Brown, Fulton, Hancock, Henderson, McDonough and 3 more	118 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.