Alert archive / Nebraska / Mesoscale Discussions in 2007

Mesoscale Discussion 1707

August 10, 200714 counties in Nebraska; 12 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Aug 10, 2007, 4:25 AM CDT for 14 counties in Nebraska; 12 counties in South Dakota. It was in force for 35 min.

The area

The outline as issued.

The facts

Issued: Aug 10, 2007, 4:25 AM CDT (09:25 UTC)
Expired: Aug 10, 2007, 5:00 AM CDT
In force: 35 min
Issued by: the Storm Prediction Center

All 26 counties

Antelope County, NE, Boyd County, NE, Cedar County, NE, Colfax County, NE, Cuming County, NE, Dixon County, NE, Dodge County, NE, Knox County, NE, Madison County, NE, Pierce County, NE, Platte County, NE, Stanton County, NE, Thurston County, NE, Wayne County, NE, Aurora County, SD, Bon Homme County, SD, Brule County, SD, Buffalo County, SD, Charles Mix County, SD, Davison County, SD, Douglas County, SD, Hand County, SD, Hughes County, SD, Hyde County, SD, Jerauld County, SD, Sully County, SD

The radar

The Sioux Falls radar (KFSD), 131 km from the middle of the area, began a volume at 09:25 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, 9.4 hours before the alert went out and 192 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: 187 J/kg
Mixed-layer CIN: -170 J/kg
Mixed-layer LCL: 2632 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 51 m²/s²
0-3 km storm-relative helicity: 122 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

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 9, 8:18 PM CDT	Severe Thunderstorm Watch	SPC	Antelope, Cedar, Knox, Madison, Pierce, Stanton and 1 more	4 hr
Aug 9, 9:33 PM CDT	Mesoscale Discussion	SPC	Antelope, Boone, Boyd, Burt, Butler, Cedar and 18 more	87 min
Aug 9, 10:14 PM CDT	Severe Thunderstorm Watch	SPC	Antelope, Boone, Burt, Butler, Cass, Cedar and 18 more	6 hr
Aug 10, 1:45 AM CDT	Mesoscale Discussion	SPC	Antelope, Boone, Boyd, Burt, Butler, Cass and 23 more	60 min
Aug 10, 10:45 AM CDT	Mesoscale Discussion	SPC	Boyd, Brown, Cherry, Grant, Keya Paha, Rock	90 min
Aug 10, 12:28 PM CDT	Severe Thunderstorm Watch	SPC	Antelope, Cedar, Dakota, Dixon, Knox, Pierce and 2 more	5 hr
Aug 10, 4:33 PM CDT	Mesoscale Discussion	SPC	Blaine, Brown, Cherry, Hooker, Thomas	57 min
Aug 10, 5:03 PM CDT	Severe Thunderstorm Watch	SPC	Arthur, Blaine, Brown, Cherry, Custer, Garden and 9 more	6 hr
Aug 10, 2:04 PM CDT	Mesoscale Discussion	SPC	Campbell, Corson, Dewey, Edmunds, McPherson, Potter and 4 more	116 min
Aug 10, 3:41 PM CDT	Severe Thunderstorm Watch	SPC	Brown, Campbell, Corson, Dewey, Edmunds, Faulk and 4 more	8 hr

Nearby

Mesoscale Discussions in Nebraska, 2007 Mesoscale Discussions in South Dakota, 2007 Every mesoscale discussion in 2007

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.