Alert archive / Missouri / Mesoscale Discussions in 2013

Mesoscale Discussion 480

April 15, 20135 states

The Storm Prediction Center issued this mesoscale discussion at Apr 15, 2013, 8:59 PM CDT for 5 states. It was in force for 61 min.

The area

The outline as issued.

The facts

Issued: Apr 15, 2013, 8:59 PM CDT (01:59 UTC)
Expired: Apr 15, 2013, 10:00 PM CDT
In force: 61 min
Issued by: the Storm Prediction Center
Chance of a watch: 60%

All 76 counties

Benton County, AR, Monroe County, IL, Bourbon County, KS, Cherokee County, KS, Crawford County, KS, Labette County, KS, Linn County, KS, Neosho County, KS, Audrain County, MO, Barry County, MO, Barton County, MO, Bates County, MO, Benton County, MO, Boone County, MO, Callaway County, MO, Camden County, MO, Cass County, MO, Cedar County, MO, Christian County, MO, City of Saint Louis, MO, Cole County, MO, Cooper County, MO, Crawford County, MO, Dade County, MO, Dallas County, MO, Dent County, MO, Douglas County, MO, Franklin County, MO, Gasconade County, MO, Greene County, MO, Henry County, MO, Hickory County, MO, Howard County, MO, Iron County, MO, Jasper County, MO, Jefferson County, MO, Johnson County, MO, Laclede County, MO, Lafayette County, MO, Lawrence County, MO, Lincoln County, MO, Maries County, MO, McDonald County, MO, Miller County, MO, Moniteau County, MO, Montgomery County, MO, Morgan County, MO, Newton County, MO, Osage County, MO, Ozark County, MO, Pettis County, MO, Phelps County, MO, Polk County, MO, Pulaski County, MO, Reynolds County, MO, Saint Charles County, MO, Saint Francois County, MO, Saint Louis County, MO, Sainte Genevieve County, MO, Saline County, MO, Shannon County, MO, St. Clair County, MO, Stone County, MO, Taney County, MO, Texas County, MO, Vernon County, MO, Warren County, MO, Washington County, MO, Webster County, MO, Wright County, MO, Craig County, OK, Delaware County, OK, Mayes County, OK, Nowata County, OK, Ottawa County, OK, Rogers County, OK

The radar

The Springfield radar (KSGF), 62 km from the middle of the area, began a volume at 02:02 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

The nearest sounding before it

Springfield, MO (KSGF), launched 00:00Z, 2.0 hours before the alert went out and 112 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: 1174 J/kg
Mixed-layer CIN: -84 J/kg
Mixed-layer LCL: 1025 m above ground
0-6 km bulk shear: 56 kt
0-1 km storm-relative helicity: 329 m²/s²
0-3 km storm-relative helicity: 640 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.9

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 15, 7:04 PM CDT	Mesoscale Discussion	SPC	Benton, Washington	41 min
Apr 16, 12:00 AM CDT	Severe Thunderstorm Watch	SPC	Bond, Brown, Calhoun, Cass, Christian, DeWitt and 19 more	4 hr
Apr 16, 12:02 AM CDT	Mesoscale Discussion	SPC	Bond, Calhoun, Cass, Champaign, Christian, Coles and 21 more	28 min
Apr 16, 2:54 PM CDT	Mesoscale Discussion	SPC	Gallatin, Hardin, Johnson, Massac, Pope, Pulaski	96 min
Apr 15, 10:13 PM CDT	Severe Thunderstorm Watch	SPC	Allen, Bourbon, Butler, Chautauqua, Cherokee, Cowley and 9 more	6 hr
Apr 16, 1:08 AM CDT	Mesoscale Discussion	SPC	Allen, Bourbon, Butler, Chautauqua, Cherokee, Cowley and 9 more	67 min

Nearby

Mesoscale Discussions in Missouri, 2013 Mesoscale Discussions in Kansas, 2013 Mesoscale Discussions in Oklahoma, 2013 Every mesoscale discussion in 2013

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.