Alert archive / Illinois / Mesoscale Discussions in 2013

Mesoscale Discussion 1939

October 5, 20134 states

The Storm Prediction Center issued this mesoscale discussion at Oct 5, 2013, 12:29 PM CDT for 4 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Oct 5, 2013, 12:29 PM CDT (17:29 UTC)
Expired
Oct 5, 2013, 2:30 PM CDT
In force
2 hr
Issued by
the Storm Prediction Center
Chance of a watch
40%
All 85 counties

Bond County, IL, Champaign County, IL, Clark County, IL, Clay County, IL, Clinton County, IL, Coles County, IL, Cook County, IL, Crawford County, IL, Cumberland County, IL, DeKalb County, IL, DeWitt County, IL, Douglas County, IL, DuPage County, IL, Edgar County, IL, Edwards County, IL, Effingham County, IL, Fayette County, IL, Ford County, IL, Franklin County, IL, Gallatin County, IL, Grundy County, IL, Hamilton County, IL, Iroquois County, IL, Jackson County, IL, Jasper County, IL, Jefferson County, IL, Johnson County, IL, Kane County, IL, Kankakee County, IL, Kendall County, IL, LaSalle County, IL, Lawrence County, IL, Livingston County, IL, Macon County, IL, Marion County, IL, McLean County, IL, Moultrie County, IL, Perry County, IL, Piatt County, IL, Randolph County, IL, Richland County, IL, Saline County, IL, Shelby County, IL, Union County, IL, Vermilion County, IL, Wabash County, IL, Washington County, IL, Wayne County, IL, White County, IL, Will County, IL, Williamson County, IL, Benton County, IN, Carroll County, IN, Cass County, IN, Clay County, IN, Clinton County, IN, Fountain County, IN, Fulton County, IN, Gibson County, IN, Greene County, IN, Jasper County, IN, Knox County, IN, Lake County, IN, LaPorte County, IN, Marshall County, IN, Montgomery County, IN, Newton County, IN, Owen County, IN, Parke County, IN, Porter County, IN, Posey County, IN, Pulaski County, IN, Putnam County, IN, Saint Joseph County, IN, Starke County, IN, Sullivan County, IN, Tippecanoe County, IN, Vanderburgh County, IN, Vermillion County, IN, Vigo County, IN, Warren County, IN, White County, IN, Berrien County, MI, Cape Girardeau County, MO, Perry County, MO

The radar

The Lincoln radar (KILX), 99 km from the middle of the area, began a volume at 17:32 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 12:00Z, 5.5 hours before the alert went out and 38 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 12:00Z on 2013-10-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 774 joules per kilogram.LCLLFCEL10008507005003002001001 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 12:00Z on 2013-10-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 107 square meters per square second.19395878Sfc1 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
774 J/kg
Mixed-layer CIN
-62 J/kg
Mixed-layer LCL
907 m above ground
0-6 km bulk shear
30 kt
0-1 km storm-relative helicity
107 m²/s²
0-3 km storm-relative helicity
89 m²/s²
Significant tornado parameter
0.2
Supercell composite
1.7

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
Oct 4, 10:29 PM CDTMesoscale DiscussionSPCJo Daviess91 min
Oct 5, 3:18 PM CDTMesoscale DiscussionSPCBlackford, Boone, Brown, Carroll, Cass, Clinton and 24 more117 min
Oct 5, 5:34 PM CDTMesoscale DiscussionSPCAdams, Bartholomew, Blackford, Brown, Crawford, Decatur and 27 more116 min
Oct 4, 9:30 PM CDTMesoscale DiscussionSPCBarton, Bates, Buchanan, Carroll, Cass, Cedar and 12 more90 min
Oct 5, 2:15 PM CDTMesoscale DiscussionSPCButler, Dunklin, Mississippi, New Madrid, Pemiscot, Stoddard3 hr

Nearby

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