Alert archive / South Dakota / Severe Thunderstorm Watches in 2018
Severe Thunderstorm Watch 355
The Storm Prediction Center issued this severe thunderstorm watch at Aug 27, 2018, 6:42 PM CDT for 23 counties in South Dakota. It was in force for 4 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 27, 2018, 6:42 PM CDT (23:42 UTC)
- Expired
- Aug 27, 2018, 11:00 PM CDT
- In force
- 4 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
All 23 counties
Aurora County, SD, Beadle County, SD, Bon Homme County, SD, Brule County, SD, Buffalo County, SD, Charles Mix County, SD, Davison County, SD, Douglas County, SD, Gregory County, SD, Hand County, SD, Hanson County, SD, Hughes County, SD, Hutchinson County, SD, Hyde County, SD, Jackson County, SD, Jerauld County, SD, Jones County, SD, Lyman County, SD, Mellette County, SD, Sanborn County, SD, Stanley County, SD, Todd County, SD, Tripp County, SD
The radar
The Aberdeen radar (KABR), 201 km from the middle of the area, began a volume at 23:42 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.
What SPC expected
The probabilities SPC published with the watch, for the watch area over its life.
- Two or more tornadoes
- 10%
- One or more EF2 to EF5 tornadoes
- 5%
- Ten or more severe wind reports
- 30%
- One or more gusts of 65 knots or more
- 20%
- Ten or more severe hail reports
- 60%
- One or more hailstones of 2 inches or more
- 30%
- Six or more combined severe hail and wind reports
- 80%
Warnings issued inside it
2 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 27, 6:54 PM CDT | Severe Thunderstorm Warning | ABR | Jones | 36 min |
| Aug 27, 7:54 PM CDT | Severe Thunderstorm Warning | ABR | Lyman | 51 min |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 26, 7:37 PM CDT | Tornado Watch | SPC | Brown, Campbell, Clark, Codington, Day, Edmunds and 12 more | 5 hr |
| Aug 26, 10:55 PM CDT | Mesoscale Discussion | SPC | Beadle, Clark, Codington, Day, Deuel, Grant and 4 more | 2 hr |
| Aug 27, 11:49 AM CDT | Mesoscale Discussion | SPC | Brookings, Clay, Lake, Lincoln, McCook, Minnehaha and 3 more | 116 min |
| Aug 27, 3:46 PM CDT | Mesoscale Discussion | SPC | Bennett, Custer, Haakon, Jackson, Meade, Mellette and 3 more | 119 min |
| Aug 27, 6:17 PM CDT | Mesoscale Discussion | SPC | Aurora, Brule, Buffalo, Charles Mix, Davison, Douglas and 15 more | 88 min |
Nearby
Severe Thunderstorm Watches in South Dakota, 2018Every severe thunderstorm watch in 2018
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; radar from the NEXRAD Level II archive.