Alert archive / Nebraska / Mesoscale Discussions in 2004

Mesoscale Discussion 1810

July 31, 200411 counties in Nebraska; 9 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Jul 31, 2004, 10:27 PM CDT for 11 counties in Nebraska; 9 counties in South Dakota. It was in force for 93 min.

The area

The outline as issued.

The facts

Issued: Jul 31, 2004, 10:27 PM CDT (03:27 UTC)
Expired: Aug 1, 2004, 12:00 AM CDT
In force: 93 min
Issued by: the Storm Prediction Center

Counties Antelope County, NE, Boyd County, NE, Brown County, NE, Cedar County, NE, Cherry County, NE, Holt County, NE, Keya Paha County, NE, Knox County, NE, Pierce County, NE, Rock County, NE, Wayne County, NE, Bon Homme County, SD, Charles Mix County, SD, Douglas County, SD, Gregory County, SD, Hutchinson County, SD, Todd County, SD, Tripp County, SD, Turner County, SD, Yankton County, SD

The radar

The North Platte radar (KLNX), 150 km from the middle of the area, began a volume at 03:29 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 00:00Z, 3.5 hours before the alert went out and 224 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: 972 J/kg
Mixed-layer CIN: -110 J/kg
Mixed-layer LCL: 1753 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 73 m²/s²
0-3 km storm-relative helicity: 207 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.5

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, 9:45 PM CDT	Severe Thunderstorm Watch	SPC	Dakota	5 hr
Aug 1, 1:48 PM CDT	Mesoscale Discussion	SPC	Cedar, Dakota, Dixon, Knox, Pierce, Thurston and 1 more	117 min
Aug 1, 2:17 PM CDT	Mesoscale Discussion	SPC	Clay, Fillmore, Gage, Jefferson, Johnson, Lancaster and 8 more	58 min
Jul 31, 8:19 PM CDT	Mesoscale Discussion	SPC	Minnehaha	56 min
Aug 1, 3:15 PM CDT	Tornado Watch	SPC	Brookings, Codington, Day, Deuel, Grant, Hamlin and 5 more	7 hr
Aug 1, 6:35 PM CDT	Severe Thunderstorm Watch	SPC	Brown, Campbell, Corson, Dewey, Edmunds, Faulk and 4 more	3 hr

Nearby

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