Alert archive / Illinois / Mesoscale Discussions in 2014

Mesoscale Discussion 1876

October 13, 201422 counties in Illinois; 11 counties in Kentucky

The Storm Prediction Center issued this mesoscale discussion at Oct 13, 2014, 3:19 PM CDT for 22 counties in Illinois; 11 counties in Kentucky. It was in force for 86 min.

The area

The outline as issued.

The facts

Issued
Oct 13, 2014, 3:19 PM CDT (20:19 UTC)
Expired
Oct 13, 2014, 4:45 PM CDT
In force
86 min
Issued by
the Storm Prediction Center
All 33 counties

Bond County, IL, Clay County, IL, Clinton County, IL, Fayette County, IL, Franklin County, IL, Gallatin County, IL, Hamilton County, IL, Hardin County, IL, Jackson County, IL, Jefferson County, IL, Johnson County, IL, Marion County, IL, Massac County, IL, Perry County, IL, Pope County, IL, Pulaski County, IL, Saline County, IL, Union County, IL, Washington County, IL, Wayne County, IL, White County, IL, Williamson County, IL, Ballard County, KY, Caldwell County, KY, Calloway County, KY, Carlisle County, KY, Crittenden County, KY, Graves County, KY, Livingston County, KY, Lyon County, KY, Marshall County, KY, McCracken County, KY, Trigg County, KY

The radar

The Evansville,IN radar (KVWX), 103 km from the middle of the area, began a volume at 20:19 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.

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 8.3 hours before the alert went out and 228 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 2014-10-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 21 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 2014-10-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 130 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
21 J/kg
Mixed-layer CIN
-2 J/kg
Mixed-layer LCL
453 m above ground
0-6 km bulk shear
45 kt
0-1 km storm-relative helicity
130 m²/s²
0-3 km storm-relative helicity
129 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
Oct 13, 8:05 AM CDTMesoscale DiscussionSPCAlexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 13 more115 min
Oct 13, 10:29 AM CDTTornado WatchSPCAlexander, Bond, Clinton, Edwards, Fayette, Franklin and 26 more8 hr
Oct 13, 1:08 PM CDTMesoscale DiscussionSPCChampaign, Clark, Coles, Crawford, Cumberland, DeWitt and 12 more2 hr
Oct 13, 1:33 PM CDTMesoscale DiscussionSPCAlexander, Bond, Clinton, Jackson, Perry, Pulaski and 3 more57 min
Oct 13, 2:24 PM CDTTornado WatchSPCChampaign, Christian, Clark, Clay, Coles, Crawford and 22 more7 hr
Oct 13, 3:42 PM CDTMesoscale DiscussionSPCBond, Champaign, Christian, Clark, Coles, Crawford and 21 more93 min
Oct 13, 5:47 PM CDTMesoscale DiscussionSPCClark, Crawford, Edgar, Edwards, Lawrence, Wabash88 min
Oct 13, 2:54 PM CDTMesoscale DiscussionSPCBreckinridge, Butler, Daviess, Edmonson, Grayson, Hancock and 8 more2 hr
Oct 13, 3:54 PM CDTTornado WatchSPCAllen, Barren, Breckinridge, Bullitt, Butler, Christian and 20 more8 hr

Nearby

Mesoscale Discussions in Illinois, 2014Mesoscale Discussions in Kentucky, 2014Every mesoscale discussion in 2014

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.