Alert archive / South Dakota / Mesoscale Discussions in 2008

Mesoscale Discussion 2296

September 28, 200812 counties in Minnesota; 15 counties in Nebraska; 35 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Sep 28, 2008, 3:34 PM CDT for 12 counties in Minnesota; 15 counties in Nebraska; 35 counties in South Dakota. It was in force for 116 min.

The area

The outline as issued.

The facts

Issued: Sep 28, 2008, 3:34 PM CDT (20:34 UTC)
Expired: Sep 28, 2008, 5:30 PM CDT
In force: 116 min
Issued by: the Storm Prediction Center

All 62 counties

Big Stone County, MN, Chippewa County, MN, Douglas County, MN, Grant County, MN, Lac qui Parle County, MN, Lincoln County, MN, Lyon County, MN, Pope County, MN, Stevens County, MN, Swift County, MN, Traverse County, MN, Yellow Medicine County, MN, Blaine County, NE, Boone County, NE, Boyd County, NE, Brown County, NE, Garfield County, NE, Greeley County, NE, Holt County, NE, Hooker County, NE, Keya Paha County, NE, Loup County, NE, Madison County, NE, Rock County, NE, Thomas County, NE, Valley County, NE, Wheeler County, NE, Aurora County, SD, Beadle County, SD, Brookings County, SD, Brown County, SD, Brule County, SD, Buffalo County, SD, Charles Mix County, SD, Clark County, SD, Codington County, SD, Davison County, SD, Day County, SD, Deuel County, SD, Douglas County, SD, Faulk County, SD, Grant County, SD, Gregory County, SD, Hamlin County, SD, Hand County, SD, Hanson County, SD, Hughes County, SD, Hutchinson County, SD, Hyde County, SD, Jerauld County, SD, Kingsbury County, SD, Lake County, SD, Lyman County, SD, Marshall County, SD, McCook County, SD, Miner County, SD, Moody County, SD, Roberts County, SD, Sanborn County, SD, Spink County, SD, Sully County, SD, Tripp County, SD

The radar

The Sioux Falls radar (KFSD), 147 km from the middle of the area, began a volume at 20:34 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Severe Thunderstorm Watch 909Sep 28, 5:00 PM CDT

The nearest sounding before it

Aberdeen, SD (KABR), launched 12:00Z, 8.6 hours before the alert went out and 134 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: 1263 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 186 m²/s²
0-3 km storm-relative helicity: 326 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
Sep 28, 4:59 PM CDT	Severe Thunderstorm Watch	SPC	Antelope, Blaine, Boyd, Brown, Cedar, Garfield and 7 more	5 hr

Nearby

Mesoscale Discussions in South Dakota, 2008 Mesoscale Discussions in Nebraska, 2008 Mesoscale Discussions in Minnesota, 2008 Every mesoscale discussion in 2008

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.