Alert archive / Illinois / Mesoscale Discussions in 2015

Mesoscale Discussion 2046

December 23, 201532 counties in Illinois; 19 counties in Iowa; 21 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at Dec 23, 2015, 3:24 PM CST for 32 counties in Illinois; 19 counties in Iowa; 21 counties in Missouri. It was in force for 96 min.

The area

The outline as issued.

The facts

Issued
Dec 23, 2015, 3:24 PM CST (21:24 UTC)
Expired
Dec 23, 2015, 5:00 PM CST
In force
96 min
Issued by
the Storm Prediction Center
All 72 counties

Appanoose County, IA, Cedar County, IA, Clinton County, IA, Davis County, IA, Des Moines County, IA, Henry County, IA, Iowa County, IA, Jefferson County, IA, Johnson County, IA, Keokuk County, IA, Lee County, IA, Louisa County, IA, Mahaska County, IA, Monroe County, IA, Muscatine County, IA, Scott 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, 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, Saint Clair County, IL, Sangamon County, IL, Schuyler County, IL, Scott County, IL, Stark County, IL, Tazewell County, IL, Warren County, IL, Whiteside County, IL, Audrain County, MO, Callaway County, MO, City of Saint Louis, MO, Clark County, MO, Franklin County, MO, Gasconade County, MO, Jefferson County, MO, Knox County, MO, Lewis County, MO, Lincoln County, MO, Marion County, MO, Monroe County, MO, Montgomery County, MO, Osage County, MO, Pike County, MO, Ralls County, MO, Saint Charles County, MO, Saint Louis County, MO, Scotland County, MO, Shelby County, MO, Warren County, MO

The radar

The Quad Cities radar (KDVN), 141 km from the middle of the area, began a volume at 21:25 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

Davenport, (KDVN), launched 12:00Z, 9.4 hours before the alert went out and 143 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-pSkew-T log-p diagram, Davenport, at 12:00Z on 2015-12-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Davenport, at 12:00Z on 2015-12-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -11 square meters per square second.1939587897117Sfc1 km3 km6 km9 kmRMLM
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.

IssuedProductOfficeCountiesLasted
Dec 23, 6:13 AM CSTMesoscale DiscussionSPCAlexander, Bond, Clinton, Franklin, Gallatin, Hamilton and 17 more2 hr
Dec 23, 9:05 AM CSTMesoscale DiscussionSPCAlexander, Clay, Edwards, Franklin, Gallatin, Hamilton and 20 more85 min
Dec 23, 9:13 AM CSTTornado WatchSPCAlexander, Bond, Champaign, Christian, Clark, Clay and 38 more8 hr
Dec 23, 9:41 AM CSTMesoscale DiscussionSPCCook, DuPage, Ford, Grundy, Iroquois, Kane and 5 more2 hr
Dec 23, 10:29 AM CSTMesoscale DiscussionSPCAlexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 15 more91 min
Dec 23, 12:06 PM CSTMesoscale DiscussionSPCClay, Crawford, Edwards, Gallatin, Hamilton, Hardin and 7 more84 min
Dec 23, 12:42 PM CSTMesoscale DiscussionSPCAdams, Brown, Bureau, Calhoun, Cass, Fulton and 25 more2 hr
Dec 23, 1:55 PM CSTTornado WatchSPCAdams, Brown, Bureau, Calhoun, Cass, Fulton and 24 more4 hr
Dec 23, 2:49 PM CSTMesoscale DiscussionSPCPemiscot86 min

Nearby

Mesoscale Discussions in Illinois, 2015Mesoscale Discussions in Missouri, 2015Mesoscale Discussions in Iowa, 2015Every 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.