Alert archive / South Dakota / Mesoscale Discussions in 2017
Mesoscale Discussion 1565
The Storm Prediction Center issued this mesoscale discussion at Aug 25, 2017, 2:57 PM CDT for 7 counties in Nebraska; 29 counties in South Dakota. It was in force for 3 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 25, 2017, 2:57 PM CDT (19:57 UTC)
- Expired
- Aug 25, 2017, 5:30 PM CDT
- In force
- 3 hr
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 80%
All 36 counties
Antelope County, NE, Boyd County, NE, Cedar County, NE, Holt County, NE, Keya Paha County, NE, Knox County, NE, Rock County, NE, Aurora County, SD, Beadle County, SD, Bon Homme County, SD, Brookings County, SD, Brule County, SD, Buffalo County, SD, Charles Mix County, SD, Clark County, SD, Clay County, SD, Davison County, SD, Douglas County, SD, Gregory County, SD, Hamlin County, SD, Hand County, SD, Hanson County, SD, Hutchinson County, SD, Jerauld County, SD, Kingsbury County, SD, Lake County, SD, Lincoln County, SD, Lyman County, SD, McCook County, SD, Miner County, SD, Minnehaha County, SD, Moody County, SD, Sanborn County, SD, Tripp County, SD, Turner County, SD, Yankton County, SD
The radar
The Sioux Falls radar (KFSD), 146 km from the middle of the area, began a volume at 19:59 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.
The nearest sounding before it
Aberdeen, SD (KABR), launched 12:00Z, 8.0 hours before the alert went out and 167 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 742 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- 36 m²/s²
- 0-3 km storm-relative helicity
- 134 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 25, 3:38 PM CDT | Severe Thunderstorm Watch | SPC | Antelope, Boyd, Brown, Cedar, Holt, Keya Paha and 3 more | 7 hr |
| Aug 25, 5:58 PM CDT | Mesoscale Discussion | SPC | Antelope, Boyd, Brown, Cedar, Holt, Keya Paha and 3 more | 2 hr |
| Aug 25, 3:46 PM CDT | Mesoscale Discussion | SPC | Butte, Custer, Lawrence, Oglala Lakota | 89 min |
Nearby
Mesoscale Discussions in South Dakota, 2017Mesoscale Discussions in Nebraska, 2017Every mesoscale discussion in 2017
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.