Alert archive / South Dakota / Tornado Watches in 2008
Tornado Watch 767
The Storm Prediction Center issued this tornado watch at Jul 28, 2008, 6:20 PM CDT for 13 counties in South Dakota. It was in force for 4 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 28, 2008, 6:20 PM CDT (23:20 UTC)
- Expired
- Jul 28, 2008, 10:08 PM CDT
- In force
- 4 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
Counties Buffalo County, SD, Campbell County, SD, Corson County, SD, Dewey County, SD, Haakon County, SD, Hughes County, SD, Hyde County, SD, Jones County, SD, Lyman County, SD, Potter County, SD, Stanley County, SD, Sully County, SD, Walworth County, SD
The radar
The Rapid City radar (KUDX), 183 km from the middle of the area, began a volume at 23:23 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
- 40%
- One or more EF2 to EF5 tornadoes
- 20%
- 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
- 70%
Warnings issued inside it
7 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 28, 6:33 PM CDT | Severe Thunderstorm Warning | ABR | Lyman | 42 min |
| Jul 28, 7:01 PM CDT | Tornado Warning | ABR | Lyman | 29 min |
| Jul 28, 7:30 PM CDT | Tornado Warning | ABR | Lyman | 30 min |
| Jul 28, 7:59 PM CDT | Severe Thunderstorm Warning | ABR | Lyman | 31 min |
| Jul 28, 8:14 PM CDT | Severe Thunderstorm Warning | ABR | Buffalo, Hand, Hughes, Hyde, Lyman | 61 min |
| Jul 28, 8:45 PM CDT | Severe Thunderstorm Warning | ABR | Buffalo, Lyman | 34 min |
| Jul 28, 8:47 PM CDT | Tornado Warning | ABR | Buffalo, Lyman | 28 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 (KUNR), launched 12:00Z, 11.3 hours before the alert went out and 190 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
- 2193 J/kg
- Mixed-layer CIN
- -358 J/kg
- Mixed-layer LCL
- 1455 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- 127 m²/s²
- 0-3 km storm-relative helicity
- 179 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 28, 3:38 PM CDT | Mesoscale Discussion | SPC | Corson, Harding, Perkins | 67 min |
Nearby
Tornado Watches in South Dakota, 2008Every tornado watch in 2008
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.