Alert archive / South Dakota / Mesoscale Discussions in 2013
Mesoscale Discussion 1893
The Storm Prediction Center issued this mesoscale discussion at Sep 18, 2013, 5:56 PM CDT for 8 counties in Minnesota; 6 counties in North Dakota; 9 counties in South Dakota. It was in force for 64 min.
The area
The outline as issued.
The facts
- Issued
- Sep 18, 2013, 5:56 PM CDT (22:56 UTC)
- Expired
- Sep 18, 2013, 7:00 PM CDT
- In force
- 64 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 80%
All 23 counties
Becker County, MN, Big Stone County, MN, Clay County, MN, Grant County, MN, Otter Tail County, MN, Stevens County, MN, Traverse County, MN, Wilkin County, MN, Barnes County, ND, Cass County, ND, Dickey County, ND, Ransom County, ND, Richland County, ND, Sargent County, ND, Brown County, SD, Clark County, SD, Codington County, SD, Day County, SD, Faulk County, SD, Grant County, SD, Marshall County, SD, Roberts County, SD, Spink County, SD
The radar
The Aberdeen radar (KABR), 83 km from the middle of the area, began a volume at 22:56 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, 10.9 hours before the alert went out and 118 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
- 1053 J/kg
- Mixed-layer CIN
- -233 J/kg
- Mixed-layer LCL
- 515 m above ground
- 0-6 km bulk shear
- 29 kt
- 0-1 km storm-relative helicity
- 100 m²/s²
- 0-3 km storm-relative helicity
- 134 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted, in the capitals the NWS used until 2016.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 18, 6:10 PM CDT | Severe Thunderstorm Watch | SPC | Becker, Clay, Grant, Mahnomen, Norman, Otter Tail and 2 more | 8 hr |
| Sep 17, 7:29 PM CDT | Mesoscale Discussion | SPC | Billings, Bowman, Golden Valley, McKenzie, Slope | 61 min |
| Sep 18, 2:16 PM CDT | Mesoscale Discussion | SPC | Adams, Bowman, Hettinger, Slope | 89 min |
| Sep 18, 4:56 PM CDT | Severe Thunderstorm Watch | SPC | Dickey, Emmons, LaMoure, Logan, McIntosh, Sioux | 7 hr |
Nearby
Mesoscale Discussions in South Dakota, 2013Mesoscale Discussions in Minnesota, 2013Mesoscale Discussions in North Dakota, 2013Every mesoscale discussion in 2013
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.