Alert archive / Missouri / Mesoscale Discussions in 2015

Mesoscale Discussion 2039

December 23, 201531 counties in Illinois; 11 counties in Iowa; 35 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at Dec 23, 2015, 12:42 PM CST for 31 counties in Illinois; 11 counties in Iowa; 35 counties in Missouri. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Dec 23, 2015, 12:42 PM CST (18:42 UTC)
Expired: Dec 23, 2015, 2:45 PM CST
In force: 2 hr
Issued by: the Storm Prediction Center
Chance of a watch: 60%

All 77 counties

Davis County, IA, Des Moines County, IA, Henry County, IA, Jefferson County, IA, Keokuk County, IA, Lee County, IA, Louisa County, IA, Muscatine County, IA, Van Buren County, IA, Wapello County, IA, Washington County, IA, Adams County, IL, Brown County, IL, Bureau County, IL, Calhoun County, IL, Cass County, IL, Fulton County, IL, Greene County, IL, Hancock County, IL, Henderson County, IL, Henry County, IL, Jersey County, IL, Knox County, IL, Logan County, IL, Macoupin County, IL, Madison County, IL, Marshall County, IL, Mason County, IL, McDonough County, IL, Menard County, IL, Mercer County, IL, Monroe County, IL, Morgan County, IL, Peoria County, IL, Pike County, IL, Rock Island County, IL, Sangamon County, IL, Schuyler County, IL, Scott County, IL, Stark County, IL, Tazewell County, IL, Warren County, IL, Adair County, MO, Audrain County, MO, Boone County, MO, Callaway County, MO, City of Saint Louis, MO, Clark County, MO, Crawford County, MO, Dent County, MO, Franklin County, MO, Gasconade County, MO, Iron County, MO, Jefferson County, MO, Knox County, MO, Lewis County, MO, Lincoln County, MO, Macon County, MO, Maries County, MO, Marion County, MO, Monroe County, MO, Montgomery County, MO, Osage County, MO, Phelps County, MO, Pike County, MO, Ralls County, MO, Randolph County, MO, Reynolds County, MO, Saint Charles County, MO, Saint Francois County, MO, Saint Louis County, MO, Schuyler County, MO, Scotland County, MO, Shannon County, MO, Shelby County, MO, Warren County, MO, Washington County, MO

The radar

The St Louis radar (KLSX), 151 km from the middle of the area, began a volume at 18:44 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 561Dec 23, 1:55 PM CST

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 6.7 hours before the alert went out and 198 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1366 m above ground
0-6 km bulk shear: 74 kt
0-1 km storm-relative helicity: -11 m²/s²
0-3 km storm-relative helicity: 229 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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
Dec 23, 6:13 AM CST	Mesoscale Discussion	SPC	Alexander, Bond, Clinton, Franklin, Gallatin, Hamilton and 17 more	2 hr
Dec 23, 9:05 AM CST	Mesoscale Discussion	SPC	Alexander, Clay, Edwards, Franklin, Gallatin, Hamilton and 20 more	85 min
Dec 23, 9:13 AM CST	Tornado Watch	SPC	Alexander, Bond, Champaign, Christian, Clark, Clay and 38 more	8 hr
Dec 23, 9:41 AM CST	Mesoscale Discussion	SPC	Cook, DuPage, Ford, Grundy, Iroquois, Kane and 5 more	2 hr
Dec 23, 10:29 AM CST	Mesoscale Discussion	SPC	Alexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 15 more	91 min
Dec 23, 12:06 PM CST	Mesoscale Discussion	SPC	Clay, Crawford, Edwards, Gallatin, Hamilton, Hardin and 7 more	84 min
Dec 23, 1:55 PM CST	Tornado Watch	SPC	Adams, Brown, Bureau, Calhoun, Cass, Fulton and 24 more	4 hr
Dec 23, 3:24 PM CST	Mesoscale Discussion	SPC	Adams, Brown, Bureau, Calhoun, Cass, Fulton and 26 more	96 min
Dec 23, 2:49 PM CST	Mesoscale Discussion	SPC	Pemiscot	86 min

Nearby

Mesoscale Discussions in Missouri, 2015 Mesoscale Discussions in Illinois, 2015 Mesoscale Discussions in Iowa, 2015 Every mesoscale discussion in 2015

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.