Alert archive / Illinois / Mesoscale Discussions in 2003

Mesoscale Discussion 2053

August 1, 200314 counties in Illinois; Ballard County, McCracken County, Kentucky; 13 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at Aug 1, 2003, 7:20 PM CDT for 14 counties in Illinois; Ballard County, McCracken County, Kentucky; 13 counties in Missouri. It was in force for 85 min.

The area

The outline as issued.

The facts

Issued: Aug 1, 2003, 7:20 PM CDT (00:20 UTC)
Expired: Aug 1, 2003, 8:45 PM CDT
In force: 85 min
Issued by: the Storm Prediction Center

All 29 counties

Alexander County, IL, Franklin County, IL, Hamilton County, IL, Jackson County, IL, Jefferson County, IL, Johnson County, IL, Massac County, IL, Perry County, IL, Pope County, IL, Pulaski County, IL, Randolph County, IL, Saline County, IL, Union County, IL, Williamson County, IL, Ballard County, KY, McCracken County, KY, Bollinger County, MO, Butler County, MO, Cape Girardeau County, MO, Iron County, MO, Madison County, MO, Mississippi County, MO, Perry County, MO, Saint Francois County, MO, Sainte Genevieve County, MO, Scott County, MO, Stoddard County, MO, Washington County, MO, Wayne County, MO

The radar

The Paducah radar (KPAH), 114 km from the middle of the area, began a volume at 00:21 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

Nashville Metro, TN (KBNA), launched 00:00Z, 0.3 hours before the alert went out and 333 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: 938 J/kg
Mixed-layer CIN: -20 J/kg
Mixed-layer LCL: 1569 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 32 m²/s²
0-3 km storm-relative helicity: 74 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.6

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
Aug 2, 4:30 AM CDT	Severe Thunderstorm Watch	SPC	Alexander, Johnson, Massac, Pope, Pulaski, Union	7 hr
Aug 2, 6:48 AM CDT	Mesoscale Discussion	SPC	Alexander, Hardin, Johnson, Massac, Pope, Pulaski and 1 more	57 min
Aug 2, 4:30 PM CDT	Severe Thunderstorm Watch	SPC	Bond, Calhoun, Christian, Clark, Clay, Clinton and 23 more	6 hr
Aug 2, 11:58 AM CDT	Mesoscale Discussion	SPC	Adair, Allen, Anderson, Barren, Bath, Bourbon and 58 more	2 hr
Aug 1, 11:54 PM CDT	Mesoscale Discussion	SPC	Barton, Bates, Cedar, Vernon	96 min
Aug 2, 1:05 AM CDT	Severe Thunderstorm Watch	SPC	Barry, Barton, Bates, Camden, Cedar, Christian and 22 more	6 hr
Aug 2, 3:26 AM CDT	Mesoscale Discussion	SPC	Barry, Barton, Bates, Camden, Cedar, Christian and 22 more	64 min
Aug 2, 3:15 PM CDT	Mesoscale Discussion	SPC	Audrain, Boone, Callaway, Cole, Cooper, Henry and 8 more	2 hr

Nearby

Mesoscale Discussions in Illinois, 2003 Mesoscale Discussions in Missouri, 2003 Mesoscale Discussions in Kentucky, 2003 Every mesoscale discussion in 2003

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.