Alert archive / South Dakota / Mesoscale Discussions in 2007

Mesoscale Discussion 1586

July 26, 20074 states

The Storm Prediction Center issued this mesoscale discussion at Jul 26, 2007, 2:58 PM CDT for 4 states. It was in force for 92 min.

The area

The outline as issued.

The facts

Issued: Jul 26, 2007, 2:58 PM CDT (19:58 UTC)
Expired: Jul 26, 2007, 4:30 PM CDT
In force: 92 min
Issued by: the Storm Prediction Center

All 48 counties

Lyon County, IA, Osceola County, IA, Sioux County, IA, Cottonwood County, MN, Jackson County, MN, Lincoln County, MN, Lyon County, MN, Murray County, MN, Nobles County, MN, Pipestone County, MN, Rock County, MN, Yellow Medicine County, MN, Antelope County, NE, Blaine County, NE, Boyd County, NE, Brown County, NE, Cedar County, NE, Garfield County, NE, Holt County, NE, Keya Paha County, NE, Knox County, NE, Loup County, NE, Pierce County, NE, Rock County, NE, Thomas County, NE, Aurora County, SD, Bon Homme County, SD, Brookings County, SD, Brule County, SD, Charles Mix County, SD, Clay County, SD, Davison County, SD, Deuel County, SD, Douglas County, SD, Gregory County, SD, Hanson County, SD, Hutchinson County, SD, Kingsbury County, SD, Lake County, SD, Lincoln County, SD, McCook County, SD, Miner County, SD, Minnehaha County, SD, Moody County, SD, Sanborn County, SD, Turner County, SD, Union County, SD, Yankton County, SD

The radar

The Sioux Falls radar (KFSD), 62 km from the middle of the area, began a volume at 19:57 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

Omaha, NE (KOAX), launched 12:00Z, 8.0 hours before the alert went out and 254 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: 151 J/kg
Mixed-layer CIN: -201 J/kg
Mixed-layer LCL: 1399 m above ground
0-6 km bulk shear: 7 kt
0-1 km storm-relative helicity: -12 m²/s²
0-3 km storm-relative helicity: -10 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
Jul 26, 4:05 PM CDT	Mesoscale Discussion	SPC	Winnebago	55 min
Jul 26, 4:54 PM CDT	Mesoscale Discussion	SPC	Black Hawk, Bremer, Butler, Cerro Gordo, Chickasaw, Emmet and 18 more	96 min
Jul 25, 8:59 PM CDT	Mesoscale Discussion	SPC	Beltrami, Clearwater, Kittson, Lake of the Woods, Mahnomen, Marshall and 5 more	2 hr
Jul 25, 11:24 PM CDT	Mesoscale Discussion	SPC	Beltrami, Clearwater, Kittson, Lake of the Woods, Mahnomen, Marshall and 5 more	96 min
Jul 26, 12:55 PM CDT	Mesoscale Discussion	SPC	Aitkin, Anoka, Benton, Blue Earth, Brown, Carlton and 30 more	65 min
Jul 26, 1:16 PM CDT	Severe Thunderstorm Watch	SPC	Aitkin, Anoka, Benton, Blue Earth, Brown, Carlton and 36 more	8 hr
Jul 26, 3:43 PM CDT	Severe Thunderstorm Watch	SPC	Dodge, Fillmore, Houston, Mower, Olmsted, Wabasha and 1 more	7 hr
Jul 25, 7:24 PM CDT	Mesoscale Discussion	SPC	Campbell, Dewey, Walworth	96 min

Nearby

Mesoscale Discussions in South Dakota, 2007 Mesoscale Discussions in Nebraska, 2007 Mesoscale Discussions in Minnesota, 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.