Alert archive / Nebraska / Mesoscale Discussions in 2004

Mesoscale Discussion 1808

July 31, 20046 counties in Iowa; 12 counties in Nebraska; 7 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Jul 31, 2004, 4:43 PM CDT for 6 counties in Iowa; 12 counties in Nebraska; 7 counties in South Dakota. It was in force for 62 min.

The area

The outline as issued.

The facts

Issued: Jul 31, 2004, 4:43 PM CDT (21:43 UTC)
Expired: Jul 31, 2004, 5:45 PM CDT
In force: 62 min
Issued by: the Storm Prediction Center

All 25 counties

Cherokee County, IA, Monona County, IA, O'Brien County, IA, Plymouth County, IA, Sioux County, IA, Woodbury County, IA, Antelope County, NE, Burt County, NE, Cedar County, NE, Cuming County, NE, Dakota County, NE, Dixon County, NE, Knox County, NE, Madison County, NE, Pierce County, NE, Stanton County, NE, Thurston County, NE, Wayne County, NE, Bon Homme County, SD, Clay County, SD, Hutchinson County, SD, Lincoln County, SD, Turner County, SD, Union County, SD, Yankton County, SD

The radar

The Sioux Falls radar (KFSD), 95 km from the middle of the area, began a volume at 21:43 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

Aberdeen, SD (KABR), launched 12:00Z, 9.7 hours before the alert went out and 251 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: 1587 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 175 m²/s²
0-3 km storm-relative helicity: 256 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
Jul 31, 12:10 PM CDT	Mesoscale Discussion	SPC	Dickinson, Emmet, Osceola	3 hr
Jul 31, 3:00 PM CDT	Tornado Watch	SPC	Dickinson, Emmet, Kossuth, Lyon, Mitchell, Osceola and 2 more	7 hr

Nearby

Mesoscale Discussions in Nebraska, 2004 Mesoscale Discussions in South Dakota, 2004 Mesoscale Discussions in Iowa, 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.