Alert archive / South Dakota / Mesoscale Discussions in 2014

Mesoscale Discussion 1457

July 24, 20144 states

The Storm Prediction Center issued this mesoscale discussion at Jul 24, 2014, 11:06 AM CDT for 4 states. It was in force for 84 min.

The area

The outline as issued.

The facts

Issued: Jul 24, 2014, 11:06 AM CDT (16:06 UTC)
Expired: Jul 24, 2014, 12:30 PM CDT
In force: 84 min
Issued by: the Storm Prediction Center
Chance of a watch: 20%

All 31 counties

Lyon County, IA, O'Brien County, IA, Osceola County, IA, Plymouth County, IA, Sioux County, IA, Big Stone County, MN, Lac qui Parle County, MN, Lincoln County, MN, Lyon County, MN, Murray County, MN, Nobles County, MN, Pipestone County, MN, Rock County, MN, Traverse County, MN, Dickey County, ND, Richland County, ND, Sargent County, ND, Brookings County, SD, Clark County, SD, Codington County, SD, Day County, SD, Deuel County, SD, Grant County, SD, Hamlin County, SD, Kingsbury County, SD, Lake County, SD, Lincoln County, SD, Marshall County, SD, Minnehaha County, SD, Moody County, SD, Roberts County, SD

The radar

The Sioux Falls radar (KFSD), 78 km from the middle of the area, began a volume at 16:09 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

Minneapolis, MN (KMPX), launched 12:00Z, 4.1 hours before the alert went out and 246 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: 1370 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: -6 m²/s²
0-3 km storm-relative helicity: 60 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 24, 2:41 AM CDT	Mesoscale Discussion	SPC	Burke, Divide, McHenry, McKenzie, McLean, Mountrail and 3 more	2 hr
Jul 24, 3:27 AM CDT	Severe Thunderstorm Watch	SPC	Billings, Bottineau, Burke, Burleigh, Divide, Dunn and 13 more	6 hr
Jul 24, 6:47 AM CDT	Mesoscale Discussion	SPC	Billings, Bottineau, Burke, Burleigh, Dunn, McHenry and 9 more	118 min
Jul 24, 2:50 PM CDT	Mesoscale Discussion	SPC	Divide, McKenzie, Williams	55 min
Jul 24, 3:54 PM CDT	Severe Thunderstorm Watch	SPC	Adams, Billings, Bowman, Burke, Divide, Dunn and 7 more	6 hr
Jul 24, 4:07 PM CDT	Mesoscale Discussion	SPC	Bowman, Slope	53 min
Jul 24, 5:53 PM CDT	Mesoscale Discussion	SPC	Adams, Billings, Bowman, Burke, Divide, Dunn and 8 more	97 min
Jul 23, 9:28 PM CDT	Mesoscale Discussion	SPC	Harding	92 min
Jul 23, 11:52 PM CDT	Mesoscale Discussion	SPC	Harding	83 min
Jul 24, 4:45 PM CDT	Mesoscale Discussion	SPC	Bennett, Haakon, Jackson, Jones, Mellette, Oglala Lakota and 3 more	3 hr

Nearby

Mesoscale Discussions in South Dakota, 2014 Mesoscale Discussions in Minnesota, 2014 Mesoscale Discussions in Iowa, 2014 Every mesoscale discussion in 2014

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.