Alert archive / South Dakota / Severe Thunderstorm Watches in 2020
Severe Thunderstorm Watch 313
The Storm Prediction Center issued this severe thunderstorm watch at Jun 28, 2020, 1:39 PM MDT for Carter County, Powder River County, Montana; 12 counties in South Dakota; Campbell County, Crook County, Weston County, Wyoming. It was in force for 8 hr.
The area
The outline as issued.
The facts
- Issued
- Jun 28, 2020, 1:39 PM MDT (19:39 UTC)
- Expired
- Jun 28, 2020, 10:00 PM MDT
- In force
- 8 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 60 kt
Counties Carter County, MT, Powder River County, MT, Bennett County, SD, Butte County, SD, Custer County, SD, Haakon County, SD, Harding County, SD, Jackson County, SD, Lawrence County, SD, Meade County, SD, Oglala Lakota County, SD, Pennington County, SD, Perkins County, SD, Ziebach County, SD, Campbell County, WY, Crook County, WY, Weston County, WY
The radar
The Rapid City radar (KUDX), 127 km from the middle of the area, began a volume at 19:39 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
- 2%
- Ten or more severe wind reports
- 40%
- One or more gusts of 65 knots or more
- 20%
- Ten or more severe hail reports
- 30%
- One or more hailstones of 2 inches or more
- 20%
- Six or more combined severe hail and wind reports
- 70%
Warnings issued inside it
21 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 28, 1:56 PM MDT | Severe Thunderstorm Warning | UNR | Campbell | 64 min |
| Jun 28, 2:16 PM MDT | Severe Thunderstorm Warning | UNR | Campbell | 59 min |
| Jun 28, 2:54 PM MDT | Severe Thunderstorm Warning | UNR | Campbell, Crook | 66 min |
| Jun 28, 3:58 PM MDT | Severe Thunderstorm Warning | UNR | Crook | 62 min |
| Jun 28, 4:04 PM MDT | Tornado Warning | UNR | Crook | 26 min |
| Jun 28, 4:40 PM MDT | Severe Thunderstorm Warning | UNR | Butte | 65 min |
| Jun 28, 4:46 PM MDT | Severe Thunderstorm Warning | UNR | Butte, Lawrence | 59 min |
| Jun 28, 4:52 PM MDT | Severe Thunderstorm Warning | UNR | Harding | 53 min |
| Jun 28, 5:26 PM MDT | Severe Thunderstorm Warning | UNR | Lawrence, Meade, Pennington | 64 min |
| Jun 28, 5:32 PM MDT | Severe Thunderstorm Warning | UNR | Butte, Lawrence, Meade, Perkins | 58 min |
| Jun 28, 6:07 PM MDT | Severe Thunderstorm Warning | UNR | Harding, Perkins | 38 min |
| Jun 28, 6:25 PM MDT | Severe Thunderstorm Warning | UNR | Meade | 18 min |
| Jun 28, 6:28 PM MDT | Severe Thunderstorm Warning | UNR | Meade, Perkins | 62 min |
| Jun 28, 6:50 PM MDT | Severe Thunderstorm Warning | UNR | Custer | 55 min |
| Jun 28, 7:18 PM MDT | Severe Thunderstorm Warning | UNR | Custer, Pennington | 42 min |
| Jun 28, 7:28 PM MDT | Severe Thunderstorm Warning | UNR | Meade, Perkins, Ziebach | 59 min |
| Jun 28, 7:38 PM MDT | Severe Thunderstorm Warning | UNR | Custer, Pennington | 67 min |
| Jun 28, 8:03 PM MDT | Severe Thunderstorm Warning | UNR | Bennett, Jackson, Oglala Lakota | 57 min |
| Jun 28, 8:11 PM MDT | Severe Thunderstorm Warning | UNR | Meade, Pennington | 15 min |
| Jun 28, 8:54 PM MDT | Severe Thunderstorm Warning | UNR | Jackson, Oglala Lakota, Pennington | 66 min |
| Jun 28, 9:44 PM MDT | Severe Thunderstorm Warning | UNR | Haakon, Jackson | 37 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
Bismarck Municip, ND (KBIS), launched 12:00Z, 7.7 hours before the alert went out and 317 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
- 1392 J/kg
- Mixed-layer CIN
- -196 J/kg
- Mixed-layer LCL
- 1261 m above ground
- 0-6 km bulk shear
- 15 kt
- 0-1 km storm-relative helicity
- 54 m²/s²
- 0-3 km storm-relative helicity
- 86 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.5
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 27, 6:07 PM MDT | Mesoscale Discussion | SPC | Daniels, Valley | 113 min |
| Jun 28, 1:11 PM MDT | Mesoscale Discussion | SPC | Carter, Powder River | 2 hr |
| Jun 28, 5:18 PM MDT | Mesoscale Discussion | SPC | Carter, Powder River | 117 min |
Nearby
Severe Thunderstorm Watches in South Dakota, 2020Severe Thunderstorm Watches in Wyoming, 2020Severe Thunderstorm Watches in Montana, 2020Every severe thunderstorm watch in 2020
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.