Alert archive / South Dakota / Severe Thunderstorm Watches in 2016
Severe Thunderstorm Watch 428
The Storm Prediction Center issued this severe thunderstorm watch at Jul 31, 2016, 2:48 PM MDT for 12 counties in Nebraska; 13 counties in South Dakota. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 31, 2016, 2:48 PM MDT (20:48 UTC)
- Expired
- Jul 31, 2016, 10:00 PM MDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 60 kt
All 25 counties
Arthur County, NE, Box Butte County, NE, Cherry County, NE, Dawes County, NE, Deuel County, NE, Garden County, NE, Grant County, NE, Hooker County, NE, Keith County, NE, McPherson County, NE, Sheridan County, NE, Sioux County, NE, 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, Oglala Lakota County, SD, Pennington County, SD, Perkins County, SD, Ziebach County, SD
The radar
The Rapid City radar (KUDX), 14 km from the middle of the area, began a volume at 20:49 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
- 30%
- One or more gusts of 65 knots or more
- 10%
- Ten or more severe hail reports
- 30%
- One or more hailstones of 2 inches or more
- 10%
- Six or more combined severe hail and wind reports
- 60%
Warnings issued inside it
10 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 31, 2:56 PM MDT | Severe Thunderstorm Warning | UNR | Lawrence, Meade | 64 min |
| Jul 31, 3:46 PM MDT | Severe Thunderstorm Warning | UNR | Harding | 59 min |
| Jul 31, 4:31 PM MDT | Severe Thunderstorm Warning | UNR | Harding | 59 min |
| Jul 31, 5:23 PM MDT | Severe Thunderstorm Warning | UNR | Harding | 67 min |
| Jul 31, 5:47 PM MDT | Severe Thunderstorm Warning | UNR | Pennington | 39 min |
| Jul 31, 6:23 PM MDT | Severe Thunderstorm Warning | UNR | Harding | 43 min |
| Jul 31, 6:28 PM MDT | Flash Flood Warning | UNR | Harding | 6 hr |
| Jul 31, 8:02 PM MDT | Severe Thunderstorm Warning | UNR | Butte, Harding, Perkins | 47 min |
| Jul 31, 8:41 PM MDT | Severe Thunderstorm Warning | UNR | Butte, Haakon, Meade, Pennington, Ziebach | 64 min |
| Jul 31, 8:44 PM MDT | Severe Thunderstorm Warning | UNR | Meade, Perkins, Ziebach | 61 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
Rapid City, SD (KRAP), launched 12:00Z, 8.8 hours before the alert went out and 8 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
- 472 J/kg
- Mixed-layer CIN
- -257 J/kg
- Mixed-layer LCL
- 1775 m above ground
- 0-6 km bulk shear
- 26 kt
- 0-1 km storm-relative helicity
- -29 m²/s²
- 0-3 km storm-relative helicity
- 34 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.3
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 30, 6:28 PM MDT | Mesoscale Discussion | SPC | Arthur, Blaine, Box Butte, Brown, Buffalo, Cherry and 28 more | 92 min |
| Jul 30, 8:32 PM MDT | Severe Thunderstorm Watch | SPC | Arthur, Blaine, Box Butte, Boyd, Brown, Cherry and 18 more | 7 hr |
| Jul 30, 10:03 PM MDT | Mesoscale Discussion | SPC | Arthur, Blaine, Box Butte, Brown, Cherry, Custer and 13 more | 117 min |
| Jul 30, 11:53 PM MDT | Mesoscale Discussion | SPC | Blaine, Boyd, Brown, Cherry, Custer, Dawson and 15 more | 97 min |
| Jul 31, 12:00 PM MDT | Mesoscale Discussion | SPC | Box Butte, Dawes, Scotts Bluff, Sheridan, Sioux | 90 min |
| Jul 31, 4:42 PM MDT | Mesoscale Discussion | SPC | Arthur, Banner, Box Butte, Cherry, Cheyenne, Dawes and 10 more | 2 hr |
| Jul 30, 6:34 PM MDT | Mesoscale Discussion | SPC | Dewey, Hughes, Hyde, Jones, Lyman, Potter and 3 more | 86 min |
| Jul 30, 6:48 PM MDT | Severe Thunderstorm Watch | SPC | Buffalo, Hughes, Hyde, Jones, Lyman, Potter and 2 more | 4 hr |
| Jul 30, 8:50 PM MDT | Mesoscale Discussion | SPC | Hughes, Hyde, Jones, Lyman, Stanley | 55 min |
| Jul 31, 1:27 PM MDT | Mesoscale Discussion | SPC | Corson, Harding, Perkins, Ziebach | 2 hr |
Nearby
Severe Thunderstorm Watches in South Dakota, 2016Severe Thunderstorm Watches in Nebraska, 2016Every severe thunderstorm watch in 2016
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.