Alert archive / South Dakota / Mesoscale Discussions in 2008

Mesoscale Discussion 2276

September 22, 200813 counties in Nebraska; 19 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Sep 22, 2008, 7:27 PM MDT for 13 counties in Nebraska; 19 counties in South Dakota. It was in force for 93 min.

The area

The outline as issued.

The facts

Issued: Sep 22, 2008, 7:27 PM MDT (01:27 UTC)
Expired: Sep 22, 2008, 9:00 PM MDT
In force: 93 min
Issued by: the Storm Prediction Center

All 32 counties

Arthur County, NE, Blaine County, NE, Brown County, NE, Cherry County, NE, Garden County, NE, Grant County, NE, Hooker County, NE, Keith County, NE, Keya Paha County, NE, Logan County, NE, McPherson County, NE, Rock County, NE, Thomas County, NE, Bennett County, SD, Brule County, SD, Buffalo County, SD, Edmunds County, SD, Faulk County, SD, Gregory County, SD, Hand County, SD, Hughes County, SD, Hyde County, SD, Jackson County, SD, Jones County, SD, Lyman County, SD, Mellette County, SD, Potter County, SD, Stanley County, SD, Sully County, SD, Todd County, SD, Tripp County, SD, Walworth County, SD

The radar

The North Platte radar (KLNX), 130 km from the middle of the area, began a volume at 01:30 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

Rapid City, SD (KUNR), launched 00:00Z, 1.5 hours before the alert went out and 197 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: 1684 m above ground
0-6 km bulk shear: 62 kt
0-1 km storm-relative helicity: 53 m²/s²
0-3 km storm-relative helicity: 175 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 23, 11:31 AM MDT	Mesoscale Discussion	SPC	Cass, Douglas, Gage, Jefferson, Johnson, Lancaster and 6 more	119 min
Sep 22, 9:58 PM MDT	Mesoscale Discussion	SPC	Beadle, Brown, Buffalo, Clark, Day, Edmunds and 7 more	62 min

Nearby

Mesoscale Discussions in South Dakota, 2008 Mesoscale Discussions in Nebraska, 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.