Alert archive / Missouri / Mesoscale Discussions in 2020

Mesoscale Discussion 595

May 15, 20207 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at May 15, 2020, 4:33 AM CDT for 7 counties in Missouri. It was in force for 57 min.

The area

The outline as issued.

The facts

Issued: May 15, 2020, 4:33 AM CDT (09:33 UTC)
Expired: May 15, 2020, 5:30 AM CDT
In force: 57 min
Issued by: the Storm Prediction Center

Counties City of Saint Louis, MO, Dent County, MO, Douglas County, MO, Jefferson County, MO, Texas County, MO, Washington County, MO, Wright County, MO

The radar

The St Louis radar (KLSX), 118 km from the middle of the area, began a volume at 09:33 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 00:00Z, 9.6 hours before the alert went out and 233 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: 1078 J/kg
Mixed-layer CIN: -12 J/kg
Mixed-layer LCL: 1252 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 32 m²/s²
0-3 km storm-relative helicity: 64 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.1

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 14, 8:22 PM CDT	Mesoscale Discussion	SPC	Adair, Andrew, Buchanan, Caldwell, Carroll, Cass and 21 more	113 min
May 14, 10:58 PM CDT	Mesoscale Discussion	SPC	Adair, Audrain, Bates, Benton, Boone, Caldwell and 29 more	2 hr
May 14, 11:17 PM CDT	Severe Thunderstorm Watch	SPC	Adair, Audrain, Barton, Bates, Benton, Boone and 35 more	5 hr
May 15, 1:06 AM CDT	Mesoscale Discussion	SPC	Audrain, Barton, Bates, Benton, Boone, Callaway and 44 more	114 min
May 15, 1:40 AM CDT	Severe Thunderstorm Watch	SPC	Christian, Crawford, Dade, Dallas, Dent, Douglas and 23 more	3 hr
May 15, 3:20 AM CDT	Mesoscale Discussion	SPC	Crawford, Dent, Douglas, Franklin, Gasconade, Jefferson and 12 more	85 min

Nearby

Mesoscale Discussions in Missouri, 2020 Every mesoscale discussion in 2020

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.