Alert archive / Illinois / Mesoscale Discussions in 2004

Mesoscale Discussion 2390

November 1, 20044 states

The Storm Prediction Center issued this mesoscale discussion at Nov 1, 2004, 2:25 PM CST for 4 states. It was in force for 95 min.

The area

The outline as issued.

The facts

Issued: Nov 1, 2004, 2:25 PM CST (20:25 UTC)
Expired: Nov 1, 2004, 4:00 PM CST
In force: 95 min
Issued by: the Storm Prediction Center

All 23 counties

Alexander County, IL, Clay County, IL, Cumberland County, IL, Effingham County, IL, Franklin County, IL, Hamilton County, IL, Jefferson County, IL, Johnson County, IL, Marion County, IL, Pulaski County, IL, Saline County, IL, Shelby County, IL, Union County, IL, Wayne County, IL, Williamson County, IL, Ballard County, KY, Carlisle County, KY, Fulton County, KY, Dunklin County, MO, Mississippi County, MO, New Madrid County, MO, Pemiscot County, MO, Lake County, TN

The radar

The Paducah radar (KPAH), 98 km from the middle of the area, began a volume at 20:26 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.

Tornado Watch 876Nov 1, 2:35 PM CST

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 8.4 hours before the alert went out and 249 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 953 m above ground
0-6 km bulk shear: 70 kt
0-1 km storm-relative helicity: 450 m²/s²
0-3 km storm-relative helicity: 757 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
Nov 1, 9:17 AM CST	Mesoscale Discussion	SPC	Carter, Oregon, Reynolds, Ripley, Shannon	118 min
Nov 1, 2:35 PM CST	Tornado Watch	SPC	Dunklin, Pemiscot	5 hr
Nov 1, 5:57 PM CST	Mesoscale Discussion	SPC	Dunklin, Pemiscot	2 hr

Nearby

Mesoscale Discussions in Illinois, 2004 Mesoscale Discussions in Missouri, 2004 Mesoscale Discussions in Kentucky, 2004 Every mesoscale discussion in 2004

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.