Alert archive / South Dakota / Severe Thunderstorm Watches in 2016
Severe Thunderstorm Watch 467
The Storm Prediction Center issued this severe thunderstorm watch at Sep 4, 2016, 10:40 PM CDT for 16 counties in Nebraska; 20 counties in South Dakota. It was in force for 4 hr.
The area
The outline as issued.
The facts
- Issued
- Sep 4, 2016, 10:40 PM CDT (03:40 UTC)
- Expired
- Sep 5, 2016, 2:49 AM CDT
- In force
- 4 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 60 kt
All 36 counties
Antelope County, NE, Blaine County, NE, Boone County, NE, Boyd County, NE, Cedar County, NE, Custer County, NE, Garfield County, NE, Greeley County, NE, Holt County, NE, Knox County, NE, Loup County, NE, Madison County, NE, Pierce County, NE, Rock County, NE, Valley County, NE, Wheeler County, NE, Aurora County, SD, Beadle County, SD, Bon Homme County, SD, Charles Mix County, SD, Clay County, SD, Davison County, SD, Douglas County, SD, Gregory County, SD, Hanson County, SD, Hutchinson County, SD, Jerauld County, SD, Kingsbury County, SD, Lake County, SD, Lincoln County, SD, McCook County, SD, Miner County, SD, Sanborn County, SD, Turner County, SD, Union County, SD, Yankton County, SD
The radar
The Sioux Falls radar (KFSD), 178 km from the middle of the area, began a volume at 03:40 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
- 5%
- One or more EF2 to EF5 tornadoes
- 2%
- Ten or more severe wind reports
- 20%
- One or more gusts of 65 knots or more
- 10%
- Ten or more severe hail reports
- 5%
- One or more hailstones of 2 inches or more
- 5%
- Six or more combined severe hail and wind reports
- 50%
Warnings issued inside it
3 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 5, 12:03 AM CDT | Severe Thunderstorm Warning | FSD | Lake, McCook, Minnehaha, Moody | 42 min |
| Sep 5, 12:47 AM CDT | Severe Thunderstorm Warning | FSD | Clay, Lincoln, Turner, Union, Yankton | 43 min |
| Sep 5, 1:27 AM CDT | Severe Thunderstorm Warning | FSD | Lincoln, Union | 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
Omaha, NE (KOAX), launched 00:00Z, 3.7 hours before the alert went out and 241 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
- 484 J/kg
- Mixed-layer CIN
- -182 J/kg
- Mixed-layer LCL
- 1048 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 220 m²/s²
- 0-3 km storm-relative helicity
- 482 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 3.2
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 4, 7:50 PM CDT | Mesoscale Discussion | SPC | Blaine, Buffalo, Custer, Dawson, Logan, Loup and 2 more | 115 min |
| Sep 4, 8:57 PM CDT | Mesoscale Discussion | SPC | Arthur, Chase, Cherry, Dundy, Frontier, Grant and 10 more | 93 min |
| Sep 5, 1:10 AM CDT | Mesoscale Discussion | SPC | Dakota, Dixon, Thurston | 2 hr |
| Sep 5, 3:08 PM CDT | Mesoscale Discussion | SPC | Blaine, Boyd, Garfield, Holt, Knox, Loup and 3 more | 2 hr |
| Sep 5, 3:30 PM CDT | Mesoscale Discussion | SPC | Frontier, Furnas, Gosper, Harlan, Hitchcock, Phelps and 1 more | 90 min |
| Sep 5, 6:06 PM CDT | Mesoscale Discussion | SPC | Antelope, Blaine, Boone, Buffalo, Custer, Dawson and 18 more | 84 min |
| Sep 5, 6:09 PM CDT | Mesoscale Discussion | SPC | Box Butte, Dawes, Garden, Morrill, Scotts Bluff, Sioux | 3 hr |
| Sep 4, 9:16 PM CDT | Mesoscale Discussion | SPC | Aurora, Beadle, Brown, Brule, Buffalo, Clark and 24 more | 59 min |
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.