Alert archive / Illinois / Mesoscale Discussions in 2013

Mesoscale Discussion 17

January 12, 201348 counties in Illinois; Lake County, Newton County, Porter County, Indiana; 28 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at Jan 12, 2013, 6:17 PM CST for 48 counties in Illinois; Lake County, Newton County, Porter County, Indiana; 28 counties in Missouri. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Jan 12, 2013, 6:17 PM CST (00:17 UTC)
Expired
Jan 13, 2013, 12:15 AM CST
In force
6 hr
Issued by
the Storm Prediction Center
All 79 counties

Bond County, IL, Boone County, IL, Bureau County, IL, Champaign County, IL, Christian County, IL, Clinton County, IL, Cook County, IL, DeKalb County, IL, DeWitt County, IL, Douglas County, IL, DuPage County, IL, Fayette County, IL, Ford County, IL, Grundy County, IL, Henry County, IL, Iroquois County, IL, Jersey County, IL, Kane County, IL, Kankakee County, IL, Kendall County, IL, Knox County, IL, Lake County, IL, LaSalle County, IL, Lee County, IL, Livingston County, IL, Logan County, IL, Macon County, IL, Macoupin County, IL, Madison County, IL, Marshall County, IL, McHenry County, IL, McLean County, IL, Menard County, IL, Monroe County, IL, Montgomery County, IL, Moultrie County, IL, Ogle County, IL, Peoria County, IL, Piatt County, IL, Putnam County, IL, Randolph County, IL, Saint Clair County, IL, Sangamon County, IL, Shelby County, IL, Stark County, IL, Tazewell County, IL, Will County, IL, Woodford County, IL, Lake County, IN, Newton County, IN, Porter County, IN, Christian County, MO, City of Saint Louis, 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, Maries County, MO, Ozark County, MO, Phelps County, MO, Pulaski County, MO, Reynolds County, MO, Saint Charles County, MO, Saint Francois County, MO, Saint Louis County, MO, Sainte Genevieve County, MO, Shannon County, MO, Stone County, MO, Taney County, MO, Texas County, MO, Warren County, MO, Washington County, MO, Webster County, MO, Wright County, MO

The radar

The Lincoln radar (KILX), 29 km from the middle of the area, began a volume at 00:21 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

Lincoln, IL (KILX), launched 00:00Z, 0.3 hours before the alert went out and 86 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, Lincoln, IL at 00:00Z on 2013-01-13Temperature 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, Lincoln, IL at 00:00Z on 2013-01-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 221 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
1256 m above ground
0-6 km bulk shear
93 kt
0-1 km storm-relative helicity
221 m²/s²
0-3 km storm-relative helicity
324 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
Jan 13, 12:09 PM CSTMesoscale DiscussionSPCClark, Crawford, Edwards, Franklin, Hamilton, Jasper and 9 more4 hr
Jan 12, 9:13 PM CSTMesoscale DiscussionSPCSaint Joseph6 hr
Jan 12, 10:47 PM CSTMesoscale DiscussionSPCBartholomew, Brown, Clark, Crawford, Daviess, Dearborn and 27 more88 min
Jan 13, 4:27 PM CSTMesoscale DiscussionSPCCarroll, Cass, Elkhart, Fulton, Kosciusko, LaGrange and 2 more4 hr
Jan 12, 6:18 PM CSTMesoscale DiscussionSPCButler, Dunklin, New Madrid, Pemiscot, Ripley, Stoddard117 min
Jan 12, 9:25 PM CSTMesoscale DiscussionSPCDunklin, New Madrid, Pemiscot2 hr

Nearby

Mesoscale Discussions in Illinois, 2013Mesoscale Discussions in Missouri, 2013Mesoscale Discussions in Indiana, 2013Every 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.