Alert archive / South Dakota / Tornado Watches in 2019
Tornado Watch 571
The Storm Prediction Center issued this tornado watch at Aug 11, 2019, 1:59 PM MDT for 12 counties in Montana; 16 counties in South Dakota; 4 counties in Wyoming. It was in force for 10 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 11, 2019, 1:59 PM MDT (19:59 UTC)
- Expired
- Aug 11, 2019, 11:56 PM MDT
- In force
- 10 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 3 in
- Strongest gust expected
- 70 kt
All 32 counties
Big Horn County, MT, Carbon County, MT, Carter County, MT, Custer County, MT, Fallon County, MT, Golden Valley County, MT, Musselshell County, MT, Powder River County, MT, Rosebud County, MT, Stillwater County, MT, Treasure County, MT, Yellowstone County, MT, Bennett County, SD, Butte County, SD, Custer County, SD, Fall River County, SD, Haakon County, SD, Harding County, SD, Jackson County, SD, Lawrence County, SD, Meade County, SD, Mellette County, SD, Oglala Lakota County, SD, Pennington County, SD, Perkins County, SD, Todd County, SD, Tripp County, SD, Ziebach County, SD, Campbell County, WY, Crook County, WY, Sheridan County, WY, Weston County, WY
The radar
The Billings radar (KBLX), 183 km from the middle of the area, began a volume at 20:03 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
- 40%
- One or more EF2 to EF5 tornadoes
- 10%
- Ten or more severe wind reports
- 50%
- One or more gusts of 65 knots or more
- 50%
- Ten or more severe hail reports
- 40%
- One or more hailstones of 2 inches or more
- 40%
- Six or more combined severe hail and wind reports
- 80%
Warnings issued inside it
36 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 11, 2:55 PM MDT | Severe Thunderstorm Warning | BYZ | Golden Valley, Stillwater, Sweet Grass, Wheatland | 50 min |
| Aug 11, 3:41 PM MDT | Severe Thunderstorm Warning | BYZ | Golden Valley, Wheatland | 64 min |
| Aug 11, 3:47 PM MDT | Severe Thunderstorm Warning | UNR | Oglala Lakota | 58 min |
| Aug 11, 4:12 PM MDT | Severe Thunderstorm Warning | UNR | Crook | 48 min |
| Aug 11, 4:22 PM MDT | Flash Flood Warning | UNR | Oglala Lakota | 4 hr |
| Aug 11, 4:27 PM MDT | Severe Thunderstorm Warning | BYZ | Golden Valley, Wheatland | 63 min |
| Aug 11, 4:38 PM MDT | Severe Thunderstorm Warning | UNR | Oglala Lakota | 52 min |
| Aug 11, 4:52 PM MDT | Flash Flood Warning | UNR | Fall River | 3 hr |
| Aug 11, 4:57 PM MDT | Severe Thunderstorm Warning | UNR | Butte | 36 min |
| Aug 11, 5:02 PM MDT | Severe Thunderstorm Warning | UNR | Custer, Fall River | 58 min |
| Aug 11, 5:15 PM MDT | Flash Flood Warning | UNR | Fall River | 3 hr |
| Aug 11, 5:21 PM MDT | Tornado Warning | UNR | Fall River | 12 min |
| Aug 11, 5:24 PM MDT | Severe Thunderstorm Warning | UNR | Oglala Lakota | 66 min |
| Aug 11, 5:31 PM MDT | Severe Thunderstorm Warning | UNR | Harding | 44 min |
| Aug 11, 5:54 PM MDT | Severe Thunderstorm Warning | BYZ | Stillwater, Sweet Grass | 36 min |
| Aug 11, 5:55 PM MDT | Severe Thunderstorm Warning | UNR | Custer, Fall River, Oglala Lakota, Pennington | 35 min |
| Aug 11, 5:59 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn | 31 min |
| Aug 11, 6:09 PM MDT | Flash Flood Warning | UNR | Oglala Lakota | 3 hr |
| Aug 11, 6:25 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn | 50 min |
| Aug 11, 6:27 PM MDT | Severe Thunderstorm Warning | BYZ | Stillwater, Yellowstone | 63 min |
| Aug 11, 6:30 PM MDT | Severe Thunderstorm Warning | BYZ | Rosebud | 60 min |
| Aug 11, 6:30 PM MDT | Severe Thunderstorm Warning | UNR | Bennett, Jackson, Oglala Lakota | 45 min |
| Aug 11, 6:35 PM MDT | Severe Thunderstorm Warning | BYZ | Golden Valley, Musselshell | 40 min |
| Aug 11, 6:40 PM MDT | Severe Thunderstorm Warning | UNR | Meade, Pennington | 50 min |
| Aug 11, 6:51 PM MDT | Severe Thunderstorm Warning | UNR | Haakon, Jackson, Pennington | 39 min |
| Aug 11, 7:06 PM MDT | Severe Thunderstorm Warning | BYZ | Musselshell | 39 min |
| Aug 11, 7:11 PM MDT | Severe Thunderstorm Warning | UNR | Bennett, Jackson, Oglala Lakota | 49 min |
| Aug 11, 7:16 PM MDT | Severe Thunderstorm Warning | BYZ | Rosebud | 59 min |
| Aug 11, 7:20 PM MDT | Flash Flood Warning | UNR | Bennett, Jackson, Oglala Lakota | 3 hr |
| Aug 11, 7:25 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Yellowstone | 50 min |
| Aug 11, 7:25 PM MDT | Severe Thunderstorm Warning | UNR | Haakon, Jackson, Pennington | 65 min |
| Aug 11, 7:31 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn | 59 min |
| Aug 11, 7:59 PM MDT | Flash Flood Warning | UNR | Oglala Lakota | 110 min |
| Aug 11, 8:02 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Rosebud, Treasure, Yellowstone | 58 min |
| Aug 11, 8:53 PM MDT | Severe Thunderstorm Warning | BYZ | Custer, Rosebud, Treasure | 52 min |
| Aug 11, 9:40 PM MDT | Severe Thunderstorm Warning | BYZ | Custer | 65 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 10, 8:34 PM MDT | Mesoscale Discussion | SPC | Big Horn, Broadwater, Carter, Custer, Golden Valley, Jefferson and 7 more | 86 min |
| Aug 11, 11:33 AM MDT | Mesoscale Discussion | SPC | Beaverhead, Broadwater, Cascade, Deer Lodge, Fergus, Gallatin and 13 more | 87 min |
| Aug 11, 12:15 PM MDT | Mesoscale Discussion | SPC | Big Horn, Carbon, Carter, Custer, Fallon, Powder River and 4 more | 90 min |
| Aug 11, 12:34 PM MDT | Severe Thunderstorm Watch | SPC | Beaverhead, Broadwater, Fergus, Gallatin, Jefferson, Judith Basin and 5 more | 6 hr |
| Aug 11, 2:43 PM MDT | Mesoscale Discussion | SPC | Beaverhead, Broadwater, Deer Lodge, Fergus, Gallatin, Jefferson and 7 more | 92 min |
| Aug 11, 3:55 PM MDT | Mesoscale Discussion | SPC | Dawson, Garfield, McCone, Petroleum, Phillips, Prairie and 4 more | 65 min |
| Aug 11, 5:07 PM MDT | Severe Thunderstorm Watch | SPC | Dawson, Garfield, McCone, Petroleum, Phillips, Prairie and 4 more | 7 hr |
| Aug 11, 5:54 PM MDT | Mesoscale Discussion | SPC | Big Horn, Carbon, Carter, Custer, Fallon, Golden Valley and 8 more | 66 min |
| Aug 11, 4:51 PM MDT | Mesoscale Discussion | SPC | Fall River | 114 min |
| Aug 11, 12:54 PM MDT | Mesoscale Discussion | SPC | Goshen, Laramie, Platte | 2 hr |
| Aug 11, 1:24 PM MDT | Severe Thunderstorm Watch | SPC | Converse, Goshen, Laramie, Niobrara, Platte | 7 hr |
Nearby
Tornado Watches in South Dakota, 2019Tornado Watches in Montana, 2019Tornado Watches in Wyoming, 2019Every tornado 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; radar from the NEXRAD Level II archive.