Alert archive / Missouri / Mesoscale Discussions in 2017

Mesoscale Discussion 478

April 10, 2017Marion County, Newton County, Arkansas; 7 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at Apr 10, 2017, 5:43 PM CDT for Marion County, Newton County, Arkansas; 7 counties in Missouri. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Apr 10, 2017, 5:43 PM CDT (22:43 UTC)
Expired: Apr 10, 2017, 7:45 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center
Chance of a watch: 5%

Counties Marion County, AR, Newton County, AR, Dent County, MO, Howell County, MO, Iron County, MO, Ozark County, MO, Reynolds County, MO, Shannon County, MO, Washington County, MO

The radar

The Springfield radar (KSGF), 130 km from the middle of the area, began a volume at 22:42 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, 10.7 hours before the alert went out and 161 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: 916 J/kg
Mixed-layer CIN: -152 J/kg
Mixed-layer LCL: 793 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 306 m²/s²
0-3 km storm-relative helicity: 327 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 8.4

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
Apr 10, 2:26 PM CDT	Severe Thunderstorm Watch	SPC	Hempstead, Howard, Lafayette, Little River, Miller, Nevada and 1 more	9 hr
Apr 10, 6:51 PM CDT	Mesoscale Discussion	SPC	Clark, Columbia, Hempstead, Howard, Lafayette, Little River and 5 more	84 min
Apr 9, 10:28 PM CDT	Mesoscale Discussion	SPC	Andrew, Atchison, Buchanan, Caldwell, Clay, Clinton and 13 more	2 hr
Apr 9, 11:28 PM CDT	Severe Thunderstorm Watch	SPC	Andrew, Atchison, Buchanan, Caldwell, Clinton, Daviess and 12 more	4 hr
Apr 10, 1:53 AM CDT	Mesoscale Discussion	SPC	Adair, Andrew, Buchanan, Caldwell, Carroll, Chariton and 21 more	2 hr
Apr 10, 3:25 PM CDT	Mesoscale Discussion	SPC	Saint Louis, City of Saint Louis	2 hr

Nearby

Mesoscale Discussions in Missouri, 2017 Mesoscale Discussions in Arkansas, 2017 Every mesoscale discussion in 2017

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.