Alert archive / Illinois / Mesoscale Discussions in 2005

Mesoscale Discussion 69

January 12, 200535 counties in Illinois; Marion County, Missouri

The Storm Prediction Center issued this mesoscale discussion at Jan 12, 2005, 4:25 PM CST for 35 counties in Illinois; Marion County, Missouri. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Jan 12, 2005, 4:25 PM CST (22:25 UTC)
Expired: Jan 12, 2005, 6:30 PM CST
In force: 2 hr
Issued by: the Storm Prediction Center

All 36 counties

Adams County, IL, Brown County, IL, Bureau County, IL, Cass County, IL, Cook County, IL, DeKalb County, IL, DuPage County, IL, Fulton County, IL, Grundy County, IL, Hancock County, IL, Henderson County, IL, Henry County, IL, Kane County, IL, Kankakee County, IL, Kendall County, IL, Knox County, IL, LaSalle County, IL, Lee County, IL, Livingston County, IL, Logan County, IL, Marshall County, IL, Mason County, IL, McDonough County, IL, McLean County, IL, Menard County, IL, Morgan County, IL, Peoria County, IL, Putnam County, IL, Sangamon County, IL, Schuyler County, IL, Stark County, IL, Tazewell County, IL, Warren County, IL, Will County, IL, Woodford County, IL, Marion County, MO

The radar

The Quad Cities radar (KDVN), 97 km from the middle of the area, began a volume at 22:27 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.

Severe Thunderstorm Watch 4Jan 12, 4:55 PM CST

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 10.4 hours before the alert went out and 93 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: 1 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 397 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 303 m²/s²
0-3 km storm-relative helicity: 323 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
Jan 12, 3:35 PM CST	Severe Thunderstorm Watch	SPC	Calhoun	6 hr
Jan 12, 4:55 PM CST	Severe Thunderstorm Watch	SPC	Adams, Brown, Bureau, Cass, Cook, DeKalb and 26 more	5 hr
Jan 12, 7:06 AM CST	Mesoscale Discussion	SPC	Andrew, Atchison, Buchanan, Gentry, Holt, Nodaway and 1 more	5 hr
Jan 12, 10:42 AM CST	Mesoscale Discussion	SPC	Andrew, Buchanan, Caldwell, Clinton, Daviess, DeKalb and 8 more	63 min
Jan 12, 12:29 PM CST	Mesoscale Discussion	SPC	Andrew, Buchanan, DeKalb, Gentry, Harrison, Holt and 2 more	4 hr
Jan 12, 3:03 PM CST	Mesoscale Discussion	SPC	Audrain, Barry, Benton, Boone, Callaway, Camden and 40 more	87 min
Jan 12, 3:05 PM CST	Severe Thunderstorm Watch	SPC	McDonald, Newton	7 hr
Jan 12, 5:38 PM CST	Mesoscale Discussion	SPC	McDonald, Newton	97 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.