Alert archive / South Dakota / Severe Thunderstorm Watches in 2020
Severe Thunderstorm Watch 332
The Storm Prediction Center issued this severe thunderstorm watch at Jul 5, 2020, 4:13 PM MDT for 16 counties in South Dakota; 8 counties in Wyoming. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 5, 2020, 4:13 PM MDT (22:13 UTC)
- Expired
- Jul 5, 2020, 11:00 PM MDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2.5 in
- Strongest gust expected
- 65 kt
All 24 counties
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, Converse County, WY, Crook County, WY, Johnson County, WY, Natrona County, WY, Niobrara County, WY, Sheridan County, WY, Weston County, WY
The radar
The Rapid City radar (KUDX), 125 km from the middle of the area, began a volume at 22:13 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
- 30%
- 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
- 70%
Warnings issued inside it
26 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 5, 4:43 PM MDT | Severe Thunderstorm Warning | CYS | Converse | 18 min |
| Jul 5, 4:47 PM MDT | Severe Thunderstorm Warning | UNR | Mellette, Tripp | 58 min |
| Jul 5, 4:56 PM MDT | Severe Thunderstorm Warning | RIW | Johnson | 49 min |
| Jul 5, 5:31 PM MDT | Severe Thunderstorm Warning | UNR | Harding | 59 min |
| Jul 5, 5:35 PM MDT | Severe Thunderstorm Warning | UNR | Tripp | 55 min |
| Jul 5, 5:39 PM MDT | Severe Thunderstorm Warning | RIW | Johnson | 51 min |
| Jul 5, 5:40 PM MDT | Severe Thunderstorm Warning | UNR | Harding | 65 min |
| Jul 5, 6:06 PM MDT | Severe Thunderstorm Warning | UNR | Campbell | 54 min |
| Jul 5, 6:19 PM MDT | Severe Thunderstorm Warning | UNR | Fall River, Oglala Lakota | 19 min |
| Jul 5, 6:27 PM MDT | Severe Thunderstorm Warning | UNR | Harding | 37 min |
| Jul 5, 6:28 PM MDT | Severe Thunderstorm Warning | UNR | Campbell, Weston | 35 min |
| Jul 5, 6:39 PM MDT | Severe Thunderstorm Warning | UNR | Harding | 66 min |
| Jul 5, 7:01 PM MDT | Severe Thunderstorm Warning | UNR | Campbell | 59 min |
| Jul 5, 7:09 PM MDT | Severe Thunderstorm Warning | UNR | Custer, Fall River | 66 min |
| Jul 5, 7:14 PM MDT | Severe Thunderstorm Warning | UNR | Campbell, Crook | 61 min |
| Jul 5, 7:20 PM MDT | Severe Thunderstorm Warning | UNR | Custer, Lawrence, Pennington | 55 min |
| Jul 5, 7:29 PM MDT | Severe Thunderstorm Warning | UNR | Oglala Lakota | 61 min |
| Jul 5, 7:57 PM MDT | Severe Thunderstorm Warning | UNR | Campbell, Crook | 63 min |
| Jul 5, 8:00 PM MDT | Severe Thunderstorm Warning | UNR | Custer, Lawrence, Meade, Pennington | 60 min |
| Jul 5, 8:10 PM MDT | Severe Thunderstorm Warning | UNR | Crook | 65 min |
| Jul 5, 8:19 PM MDT | Severe Thunderstorm Warning | UNR | Butte | 56 min |
| Jul 5, 8:24 PM MDT | Severe Thunderstorm Warning | UNR | Oglala Lakota, Pennington | 32 min |
| Jul 5, 8:47 PM MDT | Severe Thunderstorm Warning | UNR | Lawrence, Meade | 28 min |
| Jul 5, 8:55 PM MDT | Severe Thunderstorm Warning | UNR | Meade, Pennington | 53 min |
| Jul 5, 9:08 PM MDT | Severe Thunderstorm Warning | UNR | Butte | 36 min |
| Jul 5, 9:42 PM MDT | Severe Thunderstorm Warning | UNR | Meade, Pennington, Ziebach | 48 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
Riverton, WY (KRIW), launched 12:00Z, 10.2 hours before the alert went out and 361 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
- 14 J/kg
- Mixed-layer CIN
- -352 J/kg
- Mixed-layer LCL
- 2703 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- 62 m²/s²
- 0-3 km storm-relative helicity
- 136 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 |
|---|---|---|---|---|
| Jul 4, 6:38 PM MDT | Mesoscale Discussion | SPC | Brown, Edmunds, McPherson | 67 min |
| Jul 5, 2:32 PM MDT | Mesoscale Discussion | SPC | Beadle, Brown, Buffalo, Campbell, Day, Dewey and 18 more | 118 min |
| Jul 5, 3:00 PM MDT | Mesoscale Discussion | SPC | Custer, Fall River, Lawrence, Pennington | 2 hr |
| Jul 5, 3:41 PM MDT | Severe Thunderstorm Watch | SPC | Brown, Buffalo, Campbell, Corson, Dewey, Edmunds and 13 more | 6 hr |
| Jul 5, 5:29 PM MDT | Mesoscale Discussion | SPC | Brown, Buffalo, Campbell, Corson, Day, Dewey and 12 more | 2 hr |
Nearby
Severe Thunderstorm Watches in South Dakota, 2020Severe Thunderstorm Watches in Wyoming, 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.