Alert archive / South Dakota / Severe Thunderstorm Watches in 2012
Severe Thunderstorm Watch 420
The Storm Prediction Center issued this severe thunderstorm watch at Jun 22, 2012, 5:48 PM MDT for 10 counties in South Dakota; Crook County, Weston County, Wyoming. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Jun 22, 2012, 5:48 PM MDT (23:48 UTC)
- Expired
- Jun 23, 2012, 1:00 AM MDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2.5 in
- Strongest gust expected
- 60 kt
Counties Bennett County, SD, Butte County, SD, Custer County, SD, Fall River County, SD, Jackson County, SD, Lawrence County, SD, Meade County, SD, Mellette County, SD, Pennington County, SD, Todd County, SD, Crook County, WY, Weston County, WY
The radar
The Rapid City radar (KUDX), 92 km from the middle of the area, began a volume at 23:51 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
- 5%
- Ten or more severe wind reports
- 30%
- One or more gusts of 65 knots or more
- 30%
- Ten or more severe hail reports
- 30%
- One or more hailstones of 2 inches or more
- 50%
- Six or more combined severe hail and wind reports
- 70%
Warnings issued inside it
15 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 22, 6:54 PM MDT | Severe Thunderstorm Warning | UNR | Custer, Fall River | 66 min |
| Jun 22, 7:15 PM MDT | Severe Thunderstorm Warning | UNR | Custer, Meade, Pennington | 60 min |
| Jun 22, 7:39 PM MDT | Severe Thunderstorm Warning | UNR | Fall River | 66 min |
| Jun 22, 8:03 PM MDT | Tornado Warning | UNR | Fall River | 42 min |
| Jun 22, 8:06 PM MDT | Severe Thunderstorm Warning | UNR | Campbell, Crook | 54 min |
| Jun 22, 8:09 PM MDT | Severe Thunderstorm Warning | UNR | 66 min | |
| Jun 22, 8:32 PM MDT | Tornado Warning | UNR | Fall River | 58 min |
| Jun 22, 8:45 PM MDT | Severe Thunderstorm Warning | UNR | Bennett, Jackson | 60 min |
| Jun 22, 8:52 PM MDT | Severe Thunderstorm Warning | UNR | Campbell, Crook, Weston | 53 min |
| Jun 22, 9:03 PM MDT | Severe Thunderstorm Warning | UNR | Butte | 57 min |
| Jun 22, 9:44 PM MDT | Severe Thunderstorm Warning | UNR | Crook, Weston | 61 min |
| Jun 22, 9:52 PM MDT | Severe Thunderstorm Warning | UNR | Bennett, Todd | 53 min |
| Jun 22, 9:59 PM MDT | Severe Thunderstorm Warning | UNR | Lawrence, Pennington | 61 min |
| Jun 22, 10:02 PM MDT | Severe Thunderstorm Warning | UNR | Butte, Lawrence, Meade | 58 min |
| Jun 23, 12:03 AM MDT | Severe Thunderstorm Warning | UNR | Jackson, Pennington | 38 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 |
|---|---|---|---|---|
| Jun 22, 5:02 PM MDT | Mesoscale Discussion | SPC | Bennett, Butte, Custer, Fall River, Haakon, Jackson and 10 more | 118 min |
| Jun 22, 2:59 PM MDT | Mesoscale Discussion | SPC | Goshen, Laramie | 91 min |
| Jun 22, 3:52 PM MDT | Severe Thunderstorm Watch | SPC | Goshen, Niobrara, Platte | 9 hr |
Nearby
Severe Thunderstorm Watches in South Dakota, 2012Severe Thunderstorm Watches in Wyoming, 2012Every severe thunderstorm watch in 2012
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.