Alert archive / South Dakota / Severe Thunderstorm Watches in 2019
Severe Thunderstorm Watch 593
The Storm Prediction Center issued this severe thunderstorm watch at Aug 17, 2019, 6:14 PM CDT for 4 states. It was in force for 8 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 17, 2019, 6:14 PM CDT (23:14 UTC)
- Expired
- Aug 18, 2019, 2:00 AM CDT
- In force
- 8 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 65 kt
All 69 counties
Cherokee County, IA, Ida County, IA, Lyon County, IA, O'Brien County, IA, Osceola County, IA, Plymouth County, IA, Sioux County, IA, Woodbury County, IA, Big Stone County, MN, Chippewa County, MN, Cottonwood County, MN, Douglas County, MN, Grant County, MN, Jackson County, MN, Kandiyohi County, MN, Lac qui Parle County, MN, Lincoln County, MN, Lyon County, MN, Meeker County, MN, Murray County, MN, Nobles County, MN, Pipestone County, MN, Pope County, MN, Redwood County, MN, Renville County, MN, Rock County, MN, Stevens County, MN, Swift County, MN, Traverse County, MN, Yellow Medicine County, MN, Antelope County, NE, Boyd County, NE, Cedar County, NE, Dakota County, NE, Dixon County, NE, Holt County, NE, Keya Paha County, NE, Knox County, NE, Pierce County, NE, Wayne County, NE, Aurora County, SD, Beadle County, SD, Bon Homme County, SD, Brookings County, SD, Brule County, SD, Charles Mix County, SD, Clay County, SD, Codington County, SD, Davison County, SD, Deuel County, SD, Douglas County, SD, Grant County, SD, Gregory County, SD, Hamlin County, SD, Hanson County, SD, Hutchinson County, SD, Jerauld County, SD, Kingsbury County, SD, Lake County, SD, Lincoln County, SD, McCook County, SD, Miner County, SD, Minnehaha County, SD, Moody County, SD, Roberts County, SD, Sanborn County, SD, Turner County, SD, Union County, SD, Yankton County, SD
The radar
The Sioux Falls radar (KFSD), 15 km from the middle of the area, began a volume at 23:17 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
- 20%
- One or more EF2 to EF5 tornadoes
- 10%
- Ten or more severe wind reports
- 60%
- One or more gusts of 65 knots or more
- 30%
- Ten or more severe hail reports
- 50%
- One or more hailstones of 2 inches or more
- 30%
- Six or more combined severe hail and wind reports
- 90%
Warnings issued inside it
24 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 17, 6:16 PM CDT | Severe Thunderstorm Warning | FSD | Charles Mix, Gregory | 44 min |
| Aug 17, 6:24 PM CDT | Tornado Warning | FSD | Charles Mix, Gregory | 36 min |
| Aug 17, 6:41 PM CDT | Severe Thunderstorm Warning | ABR | Big Stone | 34 min |
| Aug 17, 7:10 PM CDT | Severe Thunderstorm Warning | FSD | Brule, Charles Mix, Gregory | 50 min |
| Aug 17, 7:11 PM CDT | Severe Thunderstorm Warning | ABR | Big Stone | 34 min |
| Aug 17, 7:12 PM CDT | Severe Thunderstorm Warning | FSD | Beadle | 33 min |
| Aug 17, 7:16 PM CDT | Severe Thunderstorm Warning | FSD | Aurora, Brule | 44 min |
| Aug 17, 7:41 PM CDT | Severe Thunderstorm Warning | FSD | Charles Mix, Douglas | 49 min |
| Aug 17, 7:43 PM CDT | Severe Thunderstorm Warning | FSD | Aurora, Brule, Charles Mix, Gregory, Jerauld | 47 min |
| Aug 17, 7:44 PM CDT | Severe Thunderstorm Warning | ABR | Big Stone | 31 min |
| Aug 17, 7:59 PM CDT | Severe Thunderstorm Warning | MPX | Lac qui Parle, Swift | 31 min |
| Aug 17, 8:06 PM CDT | Severe Thunderstorm Warning | FSD | Aurora, Charles Mix, Davison, Douglas, Gregory, Hanson and 4 more | 39 min |
| Aug 17, 8:13 PM CDT | Severe Thunderstorm Warning | MPX | Chippewa, Lac qui Parle | 47 min |
| Aug 17, 8:24 PM CDT | Severe Thunderstorm Warning | FSD | Charles Mix, Davison, Douglas, Hutchinson | 36 min |
| Aug 17, 8:40 PM CDT | Severe Thunderstorm Warning | FSD | Davison, Douglas, Hanson, Hutchinson, Lake, McCook and 2 more | 50 min |
| Aug 17, 9:18 PM CDT | Severe Thunderstorm Warning | FSD | Brookings, Hanson, Hutchinson, Kingsbury, Lake, Lincoln and 5 more | 42 min |
| Aug 17, 9:52 PM CDT | Severe Thunderstorm Warning | FSD | Lincoln, Pipestone, Rock | 38 min |
| Aug 17, 10:02 PM CDT | Tornado Warning | FSD | Brookings, Moody | 12 min |
| Aug 17, 10:41 PM CDT | Tornado Warning | FSD | Lyon, Osceola | 9 min |
| Aug 17, 10:46 PM CDT | Severe Thunderstorm Warning | FSD | Clay, Dickinson, Lyon, O'Brien, Osceola, Sioux | 44 min |
| Aug 17, 11:02 PM CDT | Tornado Warning | FSD | Cottonwood, Jackson, Nobles | 12 min |
| Aug 17, 11:17 PM CDT | Severe Thunderstorm Warning | FSD | Clay, Dickinson, O'Brien, Osceola, Sioux | 43 min |
| Aug 18, 12:59 AM CDT | Severe Thunderstorm Warning | FSD | Plymouth | 46 min |
| Aug 18, 1:03 AM CDT | Severe Thunderstorm Warning | FSD | Dakota, Dixon | 42 min |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
Aberdeen, SD (KABR), launched 12:00Z, 11.2 hours before the alert went out and 183 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
- 789 J/kg
- Mixed-layer CIN
- -128 J/kg
- Mixed-layer LCL
- 1386 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- 46 m²/s²
- 0-3 km storm-relative helicity
- 62 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 17, 5:12 PM CDT | Mesoscale Discussion | SPC | Dickinson, Lyon, O'Brien, Osceola, Plymouth, Sioux | 2 hr |
| Aug 17, 5:35 PM CDT | Mesoscale Discussion | SPC | Becker, Beltrami, Clay, Clearwater, Hubbard, Koochiching and 5 more | 115 min |
| Aug 16, 8:43 PM CDT | Mesoscale Discussion | SPC | Adams, Arthur, Banner, Box Butte, Buffalo, Chase and 34 more | 2 hr |
| Aug 16, 11:40 PM CDT | Severe Thunderstorm Watch | SPC | Gage, Jefferson, Nuckolls, Pawnee, Richardson, Thayer | 7 hr |
| Aug 17, 2:40 AM CDT | Mesoscale Discussion | SPC | Gage, Jefferson, Nuckolls, Pawnee, Richardson, Thayer | 95 min |
| Aug 17, 4:40 AM CDT | Mesoscale Discussion | SPC | Gage, Jefferson, Pawnee, Richardson | 2 hr |
| Aug 17, 2:34 PM CDT | Mesoscale Discussion | SPC | Banner, Chase, Cheyenne, Deuel, Dundy, Frontier and 8 more | 116 min |
| Aug 17, 3:36 PM CDT | Severe Thunderstorm Watch | SPC | Dundy, Hitchcock, Red Willow | 7 hr |
| Aug 17, 6:28 PM CDT | Mesoscale Discussion | SPC | Dundy, Hitchcock, Red Willow | 2 hr |
| Aug 17, 12:31 PM CDT | Mesoscale Discussion | SPC | Beadle, Brown, Buffalo, Campbell, Corson, Custer and 24 more | 119 min |
| Aug 17, 2:19 PM CDT | Severe Thunderstorm Watch | SPC | Bennett, Brown, Buffalo, Clark, Custer, Day and 22 more | 7 hr |
Nearby
Severe Thunderstorm Watches in South Dakota, 2019Severe Thunderstorm Watches in Minnesota, 2019Severe Thunderstorm Watches in Nebraska, 2019Every severe thunderstorm watch in 2019
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.