Alert archive / Illinois / Mesoscale Discussions in 2014

Mesoscale Discussion 1872

October 13, 201418 counties in Illinois

The Storm Prediction Center issued this mesoscale discussion at Oct 13, 2014, 1:08 PM CDT for 18 counties in Illinois. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Oct 13, 2014, 1:08 PM CDT (18:08 UTC)
Expired: Oct 13, 2014, 3:15 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center
Chance of a watch: 60%

Counties Champaign County, IL, Clark County, IL, Coles County, IL, Crawford County, IL, Cumberland County, IL, DeWitt County, IL, Douglas County, IL, Edgar County, IL, Effingham County, IL, Ford County, IL, Jasper County, IL, Logan County, IL, Macon County, IL, McLean County, IL, Moultrie County, IL, Piatt County, IL, Shelby County, IL, Vermilion County, IL

The radar

The Lincoln radar (KILX), 68 km from the middle of the area, began a volume at 18:07 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, 6.1 hours before the alert went out and 35 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: 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.

Issued	Product	Office	Counties	Lasted
Oct 13, 8:05 AM CDT	Mesoscale Discussion	SPC	Alexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 13 more	115 min
Oct 13, 10:29 AM CDT	Tornado Watch	SPC	Alexander, Bond, Clinton, Edwards, Fayette, Franklin and 26 more	8 hr
Oct 13, 1:33 PM CDT	Mesoscale Discussion	SPC	Alexander, Bond, Clinton, Jackson, Perry, Pulaski and 3 more	57 min
Oct 13, 2:24 PM CDT	Tornado Watch	SPC	Champaign, Christian, Clark, Clay, Coles, Crawford and 22 more	7 hr
Oct 13, 3:19 PM CDT	Mesoscale Discussion	SPC	Bond, Clay, Clinton, Fayette, Franklin, Gallatin and 16 more	86 min
Oct 13, 3:42 PM CDT	Mesoscale Discussion	SPC	Bond, Champaign, Christian, Clark, Coles, Crawford and 21 more	93 min
Oct 13, 5:47 PM CDT	Mesoscale Discussion	SPC	Clark, Crawford, Edgar, Edwards, Lawrence, Wabash	88 min

Nearby

Mesoscale Discussions in Illinois, 2014 Every 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.