Alert archive / South Dakota / Mesoscale Discussions in 2005

Mesoscale Discussion 2017

August 18, 2005Emmons County, Logan County, McIntosh County, North Dakota; 14 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Aug 18, 2005, 3:27 PM CDT for Emmons County, Logan County, McIntosh County, North Dakota; 14 counties in South Dakota. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Aug 18, 2005, 3:27 PM CDT (20:27 UTC)
Expired: Aug 18, 2005, 5:30 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center

Counties Emmons County, ND, Logan County, ND, McIntosh County, ND, Buffalo County, SD, Campbell County, SD, Dewey County, SD, Edmunds County, SD, Faulk County, SD, Hand County, SD, Hughes County, SD, Hyde County, SD, Lyman County, SD, McPherson County, SD, Potter County, SD, Stanley County, SD, Sully County, SD, Walworth County, SD

The radar

The Aberdeen radar (KABR), 110 km from the middle of the area, began a volume at 20:28 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 12:00Z, 8.5 hours before the alert went out and 128 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: 984 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 8 m²/s²
0-3 km storm-relative helicity: 50 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
Aug 17, 9:22 PM CDT	Mesoscale Discussion	SPC	Cass, Dickey, LaMoure, McIntosh, Ransom, Richland and 1 more	23 min
Aug 17, 7:56 PM CDT	Mesoscale Discussion	SPC	Aurora, Beadle, Bon Homme, Brule, Buffalo, Charles Mix and 19 more	2 hr
Aug 18, 2:05 PM CDT	Mesoscale Discussion	SPC	Custer, Fall River, Lawrence, Meade, Oglala Lakota, Pennington	115 min

Nearby

Mesoscale Discussions in South Dakota, 2005 Mesoscale Discussions in North Dakota, 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.