Alert archive / South Dakota / Mesoscale Discussions in 2005

Mesoscale Discussion 1844

July 24, 2005Lincoln County, Pipestone County, Rock County, Minnesota; Boyd County, Nebraska; 19 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Jul 24, 2005, 5:22 AM CDT for Lincoln County, Pipestone County, Rock County, Minnesota; Boyd County, Nebraska; 19 counties in South Dakota. It was in force for 83 min.

The area

The outline as issued.

The facts

Issued: Jul 24, 2005, 5:22 AM CDT (10:22 UTC)
Expired: Jul 24, 2005, 6:45 AM CDT
In force: 83 min
Issued by: the Storm Prediction Center

All 23 counties

Lincoln County, MN, Pipestone County, MN, Rock County, MN, Boyd County, NE, Aurora County, SD, Brookings County, SD, Brule County, SD, Buffalo County, SD, Charles Mix County, SD, Davison County, SD, Douglas County, SD, Gregory County, SD, Hanson County, SD, Hutchinson County, SD, Jerauld County, SD, Kingsbury County, SD, Lake County, SD, McCook County, SD, Miner County, SD, Minnehaha County, SD, Moody County, SD, Sanborn County, SD, Turner County, SD

The radar

The Sioux Falls radar (KFSD), 67 km from the middle of the area, began a volume at 10:23 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, 10.4 hours before the alert went out and 153 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: 3722 J/kg
Mixed-layer CIN: -197 J/kg
Mixed-layer LCL: 1139 m above ground
0-6 km bulk shear: 55 kt
0-1 km storm-relative helicity: -2 m²/s²
0-3 km storm-relative helicity: 137 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -2.7

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 23, 11:02 PM CDT	Mesoscale Discussion	SPC	Carlton, Pine	118 min
Jul 24, 3:30 AM CDT	Severe Thunderstorm Watch	SPC	Lincoln, Rock	2 hr
Jul 24, 10:33 AM CDT	Mesoscale Discussion	SPC	Blue Earth, Brown, Cottonwood, Dodge, Faribault, Fillmore and 15 more	117 min
Jul 24, 4:50 PM CDT	Severe Thunderstorm Watch	SPC	Freeborn, Mower	5 hr
Jul 24, 4:10 PM CDT	Mesoscale Discussion	SPC	Antelope, Blaine, Boone, Brown, Buffalo, Burt and 31 more	95 min
Jul 24, 3:14 AM CDT	Mesoscale Discussion	SPC	Aurora, Brule, Davison, Gregory, Jerauld, Kingsbury and 3 more	91 min
Jul 24, 2:14 PM CDT	Mesoscale Discussion	SPC	Butte, Corson, Dewey, Haakon, Harding, Lawrence and 4 more	2 hr
Jul 24, 2:50 PM CDT	Severe Thunderstorm Watch	SPC	Butte, Harding, Lawrence, Meade, Perkins	7 hr

Nearby

Mesoscale Discussions in South Dakota, 2005 Mesoscale Discussions in Minnesota, 2005 Mesoscale Discussions in Nebraska, 2005 Every mesoscale discussion in 2005

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.