Alert archive / Illinois / Mesoscale Discussions in 2005

Mesoscale Discussion 78

January 13, 200519 counties in Illinois; 8 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at Jan 13, 2005, 1:02 AM CST for 19 counties in Illinois; 8 counties in Missouri. It was in force for 88 min.

The area

The outline as issued.

The facts

Issued: Jan 13, 2005, 1:02 AM CST (07:02 UTC)
Expired: Jan 13, 2005, 2:30 AM CST
In force: 88 min
Issued by: the Storm Prediction Center

All 27 counties

Alexander County, IL, Bond County, IL, Clay County, IL, Clinton County, IL, Coles County, IL, Cumberland County, IL, Douglas County, IL, Effingham County, IL, Fayette County, IL, Franklin County, IL, Jackson County, IL, Jefferson County, IL, Marion County, IL, Moultrie County, IL, Perry County, IL, Randolph County, IL, Shelby County, IL, Union County, IL, Washington County, IL, Bollinger County, MO, Butler County, MO, Cape Girardeau County, MO, Madison County, MO, Perry County, MO, Scott County, MO, Stoddard County, MO, Wayne County, MO

The radar

The Paducah radar (KPAH), 115 km from the middle of the area, began a volume at 07:03 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, 7.0 hours before the alert went out and 257 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: 170 J/kg
Mixed-layer CIN: -123 J/kg
Mixed-layer LCL: 924 m above ground
0-6 km bulk shear: 56 kt
0-1 km storm-relative helicity: 217 m²/s²
0-3 km storm-relative helicity: 221 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.3

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
Jan 12, 6:02 PM CST	Mesoscale Discussion	SPC	Calhoun	88 min
Jan 12, 7:34 PM CST	Mesoscale Discussion	SPC	Brown, Bureau, Cass, Cook, DeKalb, DeWitt and 24 more	86 min
Jan 12, 9:28 PM CST	Mesoscale Discussion	SPC	Alexander, Bond, Clinton, Fayette, Jackson, Jersey and 9 more	32 min
Jan 12, 9:45 PM CST	Severe Thunderstorm Watch	SPC	Alexander, Bond, Clinton, Effingham, Fayette, Greene and 14 more	5 hr
Jan 13, 6:51 AM CST	Mesoscale Discussion	SPC	Adams, Brown, Calhoun, Cass, Fulton, Greene and 15 more	4 hr
Jan 13, 11:58 AM CST	Mesoscale Discussion	SPC	Bond, Calhoun, Cass, Champaign, Christian, Clark and 45 more	5 hr
Jan 12, 6:50 PM CST	Mesoscale Discussion	SPC	Adair, Caldwell, Carroll, Cass, Jackson, Lafayette and 6 more	4 hr
Jan 12, 10:16 PM CST	Mesoscale Discussion	SPC	Dunklin	59 min

Nearby

Mesoscale Discussions in Illinois, 2005 Mesoscale Discussions in Missouri, 2005 Every mesoscale discussion in 2005

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.