Alert archive / Missouri / Mesoscale Discussions in 2024

Mesoscale Discussion 944

May 24, 2024Monroe County, Randolph County, Saint Clair County, Illinois; 14 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at May 24, 2024, 8:49 PM CDT for Monroe County, Randolph County, Saint Clair County, Illinois; 14 counties in Missouri. It was in force for 86 min.

The area

The outline as issued.

The facts

Issued: May 24, 2024, 8:49 PM CDT (01:49 UTC)
Expired: May 24, 2024, 10:15 PM CDT
In force: 86 min
Issued by: the Storm Prediction Center
Concerning: Severe thunderstorm watch 302

Counties Monroe County, IL, Randolph County, IL, Saint Clair County, IL, City of Saint Louis, MO, Crawford County, MO, Franklin County, MO, Gasconade County, MO, Iron County, MO, Jefferson County, MO, Madison County, MO, Maries County, MO, Perry County, MO, Saint Charles County, MO, Saint Francois County, MO, Saint Louis County, MO, Sainte Genevieve County, MO, Washington County, MO

The radar

The St Louis radar (KLSX), 65 km from the middle of the area, began a volume at 01:53 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 00:00Z, 1.8 hours before the alert went out and 294 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: 45 J/kg
Mixed-layer CIN: -442 J/kg
Mixed-layer LCL: 1337 m above ground
0-6 km bulk shear: 63 kt
0-1 km storm-relative helicity: 136 m²/s²
0-3 km storm-relative helicity: 255 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 24, 7:03 PM CDT	Mesoscale Discussion	SPC	Barry, Camden, Christian, Dallas, Douglas, Greene and 7 more	117 min
May 24, 9:46 PM CDT	Mesoscale Discussion	SPC	Christian, Douglas, Howell, Ozark, Stone, Taney	119 min

Nearby

Mesoscale Discussions in Missouri, 2024 Mesoscale Discussions in Illinois, 2024 Every mesoscale discussion in 2024

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.