Alert archive / Missouri / Mesoscale Discussions in 2023

Mesoscale Discussion 698

May 6, 2023Marion County, Ralls County, Shelby County, Missouri

The Storm Prediction Center issued this mesoscale discussion at May 6, 2023, 11:24 PM CDT for Marion County, Ralls County, Shelby County, Missouri. It was in force for 96 min.

The area

The outline as issued.

The facts

Issued: May 6, 2023, 11:24 PM CDT (04:24 UTC)
Expired: May 7, 2023, 1:00 AM CDT
In force: 96 min
Issued by: the Storm Prediction Center
Concerning: Tornado watch 192

Counties Marion County, MO, Ralls County, MO, Shelby County, MO

The radar

The St Louis radar (KLSX), 147 km from the middle of the area, began a volume at 04:26 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

Davenport, (KDVN), launched 00:00Z, 4.4 hours before the alert went out and 229 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: 668 J/kg
Mixed-layer CIN: -146 J/kg
Mixed-layer LCL: 1150 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 55 m²/s²
0-3 km storm-relative helicity: 158 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 1.6

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 6, 8:12 PM CDT	Mesoscale Discussion	SPC	Clark, Knox, Lewis, Marion, Monroe, Pike and 3 more	93 min
May 6, 8:50 PM CDT	Severe Thunderstorm Watch	SPC	Clark, Scotland	7 hr
May 6, 9:00 PM CDT	Tornado Watch	SPC	Audrain, Knox, Lewis, Marion, Monroe, Pike and 2 more	5 hr
May 7, 1:37 AM CDT	Mesoscale Discussion	SPC	Clark	113 min
May 7, 1:18 PM CDT	Severe Thunderstorm Watch	SPC	Cape Girardeau, Jefferson, Mississippi, Perry, Saint Charles, Sainte Genevieve and 3 more	10 hr
May 7, 4:10 PM CDT	Severe Thunderstorm Watch	SPC	Clark, Scotland	10 hr
May 7, 6:02 PM CDT	Mesoscale Discussion	SPC	Andrew, Atchison, Buchanan, Gentry, Holt, Nodaway and 1 more	88 min
May 7, 6:10 PM CDT	Mesoscale Discussion	SPC	Saint Louis, City of Saint Louis	2 hr
May 7, 6:45 PM CDT	Severe Thunderstorm Watch	SPC	Andrew, Atchison, Holt, Nodaway	6 hr

Nearby

Mesoscale Discussions in Missouri, 2023 Every mesoscale discussion in 2023

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.