Alert archive / Missouri / Mesoscale Discussions in 2013

Mesoscale Discussion 71

January 29, 20139 counties in Arkansas; 11 counties in Illinois; 42 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at Jan 29, 2013, 11:54 AM CST for 9 counties in Arkansas; 11 counties in Illinois; 42 counties in Missouri. It was in force for 96 min.

The area

The outline as issued.

The facts

Issued: Jan 29, 2013, 11:54 AM CST (17:54 UTC)
Expired: Jan 29, 2013, 1:30 PM CST
In force: 96 min
Issued by: the Storm Prediction Center
Chance of a watch: 80%

All 62 counties

Baxter County, AR, Boone County, AR, Fulton County, AR, Izard County, AR, Marion County, AR, Newton County, AR, Randolph County, AR, Searcy County, AR, Sharp County, AR, Calhoun County, IL, Greene County, IL, Jersey County, IL, Macoupin County, IL, Madison County, IL, Monroe County, IL, Morgan County, IL, Pike County, IL, Randolph County, IL, Saint Clair County, IL, Scott County, IL, Audrain County, MO, Bollinger County, MO, Boone County, MO, Butler County, MO, Callaway County, MO, Carter County, MO, City of Saint Louis, MO, Cole County, MO, Crawford County, MO, Dent County, MO, Douglas County, MO, Franklin County, MO, Gasconade County, MO, Howell County, MO, Iron County, MO, Jefferson County, MO, Laclede County, MO, Lincoln County, MO, Madison County, MO, Maries County, MO, Miller County, MO, Montgomery County, MO, Oregon County, MO, Osage County, MO, Ozark County, MO, Perry County, MO, Phelps County, MO, Pike County, MO, Pulaski County, MO, Ralls County, MO, Reynolds County, MO, Ripley County, MO, Saint Charles County, MO, Saint Francois County, MO, Saint Louis County, MO, Sainte Genevieve County, MO, Shannon County, MO, Texas County, MO, Warren County, MO, Washington County, MO, Wayne County, MO, Wright County, MO

The radar

The St Louis radar (KLSX), 90 km from the middle of the area, began a volume at 17:55 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.

Tornado Watch 9Jan 29, 12:35 PM CST

The nearest sounding before it

Springfield, MO (KSGF), launched 12:00Z, 5.9 hours before the alert went out and 250 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: 285 J/kg
Mixed-layer CIN: -8 J/kg
Mixed-layer LCL: 728 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: 257 m²/s²
0-3 km storm-relative helicity: 224 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 1.4

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
Jan 29, 7:26 AM CST	Tornado Watch	SPC	Benton, Carroll, Crawford, Madison, Washington	10 hr
Jan 29, 9:46 AM CST	Mesoscale Discussion	SPC	Crawford, Franklin, Hempstead, Howard, Johnson, Little River and 9 more	119 min
Jan 29, 10:59 AM CST	Tornado Watch	SPC	Franklin, Hempstead, Howard, Johnson, Little River, Logan and 9 more	8 hr
Jan 29, 11:05 AM CST	Mesoscale Discussion	SPC	Benton, Carroll, Crawford, Madison, Washington	55 min
Jan 29, 12:35 PM CST	Tornado Watch	SPC	Baxter, Boone, Cleburne, Conway, Fulton, Izard and 6 more	7 hr
Jan 29, 1:19 PM CST	Mesoscale Discussion	SPC	Benton, Boone, Carroll, Crawford, Madison, Washington	56 min
Jan 29, 2:15 PM CST	Mesoscale Discussion	SPC	Howard, Little River, Logan, Polk, Scott, Sebastian and 1 more	2 hr
Jan 29, 3:31 PM CST	Mesoscale Discussion	SPC	Baxter, Benton, Boone, Carroll, Cleburne, Crawford and 12 more	89 min
Jan 29, 4:37 PM CST	Mesoscale Discussion	SPC	Arkansas, Ashley, Bradley, Chicot, Desha, Drew and 5 more	2 hr
Jan 29, 4:58 PM CST	Mesoscale Discussion	SPC	Baxter, Boone, Bradley, Calhoun, Clark, Cleburne and 47 more	92 min
Jan 29, 5:37 PM CST	Tornado Watch	SPC	Arkansas, Ashley, Baxter, Boone, Bradley, Calhoun and 62 more	8 hr
Jan 28, 9:59 PM CST	Mesoscale Discussion	SPC	Boone, Bureau, Carroll, Cook, DeKalb, DuPage and 20 more	2 hr
Jan 29, 12:51 AM CST	Mesoscale Discussion	SPC	Barton, Bates, Benton, Buchanan, Caldwell, Camden and 27 more	84 min
Jan 29, 5:41 AM CST	Mesoscale Discussion	SPC	Barton, Bates, Benton, Cass, Cedar, Dade and 10 more	94 min

Nearby

Mesoscale Discussions in Missouri, 2013 Mesoscale Discussions in Illinois, 2013 Mesoscale Discussions in Arkansas, 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.