Alert archive / South Dakota / Severe Thunderstorm Watches in 2016
Severe Thunderstorm Watch 425
The Storm Prediction Center issued this severe thunderstorm watch at Jul 30, 2016, 7:48 PM CDT for 8 counties in South Dakota. It was in force for 4 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 30, 2016, 7:48 PM CDT (00:48 UTC)
- Expired
- Jul 31, 2016, 12:00 AM CDT
- In force
- 4 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2.5 in
- Strongest gust expected
- 65 kt
Counties Buffalo County, SD, Hughes County, SD, Hyde County, SD, Jones County, SD, Lyman County, SD, Potter County, SD, Stanley County, SD, Sully County, SD
The radar
The Aberdeen radar (KABR), 192 km from the middle of the area, began a volume at 00:49 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
- 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
- 30%
- Six or more combined severe hail and wind reports
- 40%
Warnings issued inside it
4 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 30, 7:57 PM CDT | Severe Thunderstorm Warning | ABR | Jones | 48 min |
| Jul 30, 8:24 PM CDT | Severe Thunderstorm Warning | ABR | Hughes, Stanley, Sully | 66 min |
| Jul 30, 9:27 PM CDT | Severe Thunderstorm Warning | ABR | Hughes, Stanley, Sully | 78 min |
| Jul 30, 10:23 PM CDT | Severe Thunderstorm Warning | ABR | Jones, Lyman, Stanley | 50 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
Aberdeen, SD (KABR), launched 00:00Z, 0.8 hours before the alert went out and 160 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
- 24 J/kg
- Mixed-layer CIN
- -64 J/kg
- Mixed-layer LCL
- 1948 m above ground
- 0-6 km bulk shear
- 27 kt
- 0-1 km storm-relative helicity
- -11 m²/s²
- 0-3 km storm-relative helicity
- 174 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.1
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 30, 7:28 PM CDT | Mesoscale Discussion | SPC | Gregory, Todd, Tripp | 92 min |
| Jul 30, 7:34 PM CDT | Mesoscale Discussion | SPC | Dewey, Hughes, Hyde, Jones, Lyman, Potter and 3 more | 86 min |
| Jul 30, 9:32 PM CDT | Severe Thunderstorm Watch | SPC | Bennett, Custer, Fall River, Jackson, Mellette, Oglala Lakota and 3 more | 7 hr |
| Jul 30, 9:50 PM CDT | Mesoscale Discussion | SPC | Hughes, Hyde, Jones, Lyman, Stanley | 55 min |
| Jul 30, 11:03 PM CDT | Mesoscale Discussion | SPC | Bennett, Haakon, Jackson, Jones, Mellette, Oglala Lakota and 2 more | 117 min |
| Jul 31, 12:53 AM CDT | Mesoscale Discussion | SPC | Charles Mix, Gregory, Tripp | 97 min |
| Jul 31, 1:00 PM CDT | Mesoscale Discussion | SPC | Butte, Custer, Fall River, Lawrence, Meade, Oglala Lakota and 1 more | 90 min |
| Jul 31, 2:27 PM CDT | Mesoscale Discussion | SPC | Corson, Harding, Perkins, Ziebach | 2 hr |
| Jul 31, 3:48 PM CDT | Severe Thunderstorm Watch | SPC | Bennett, Butte, Custer, Fall River, Haakon, Harding and 7 more | 7 hr |
| Jul 31, 5:42 PM CDT | Mesoscale Discussion | SPC | Bennett, Butte, Corson, Custer, Dewey, Fall River and 11 more | 2 hr |
Nearby
Severe Thunderstorm Watches in South Dakota, 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.