Alert archive / South Dakota / Tornado Watches in 2009
Tornado Watch 514
The Storm Prediction Center issued this tornado watch at Jun 25, 2009, 3:50 PM MDT for 9 counties in South Dakota. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Jun 25, 2009, 3:50 PM MDT (21:50 UTC)
- Expired
- Jun 25, 2009, 8:30 PM MDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 3 in
- Strongest gust expected
- 60 kt
Counties Bennett County, SD, Butte County, SD, Custer County, SD, Fall River County, SD, Haakon County, SD, Jackson County, SD, Lawrence County, SD, Meade County, SD, Pennington County, SD
The radar
The Rapid City radar (KUDX), 34 km from the middle of the area, began a volume at 21:51 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
- 40%
- One or more hailstones of 2 inches or more
- 30%
- Six or more combined severe hail and wind reports
- 70%
Warnings issued inside it
6 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 25, 5:14 PM MDT | Severe Thunderstorm Warning | UNR | Custer, Fall River | 61 min |
| Jun 25, 5:37 PM MDT | Severe Thunderstorm Warning | UNR | Custer, Fall River | 30 min |
| Jun 25, 6:26 PM MDT | Severe Thunderstorm Warning | UNR | Haakon, Meade, Pennington, Ziebach | 64 min |
| Jun 25, 6:43 PM MDT | Severe Thunderstorm Warning | UNR | Jackson | 43 min |
| Jun 25, 6:48 PM MDT | Severe Thunderstorm Warning | UNR | Pennington | 43 min |
| Jun 25, 7:29 PM MDT | Severe Thunderstorm Warning | UNR | Haakon | 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 (KUNR), launched 12:00Z, 9.8 hours before the alert went out and 41 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
- 44 J/kg
- Mixed-layer CIN
- -363 J/kg
- Mixed-layer LCL
- 2033 m above ground
- 0-6 km bulk shear
- 26 kt
- 0-1 km storm-relative helicity
- 28 m²/s²
- 0-3 km storm-relative helicity
- 143 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 |
|---|---|---|---|---|
| Jun 24, 6:21 PM MDT | Mesoscale Discussion | SPC | Perkins | 84 min |
| Jun 24, 7:49 PM MDT | Mesoscale Discussion | SPC | Beadle, Brookings, Brown, Campbell, Clark, Codington and 22 more | 86 min |
| Jun 24, 9:53 PM MDT | Mesoscale Discussion | SPC | Bon Homme, Charles Mix, Clay, Hutchinson, Lincoln, Turner and 2 more | 97 min |
| Jun 24, 10:53 PM MDT | Severe Thunderstorm Watch | SPC | Aurora, Bon Homme, Charles Mix, Clay, Davison, Douglas and 7 more | 5 hr |
| Jun 25, 1:13 AM MDT | Mesoscale Discussion | SPC | Clay, Union, Yankton | 92 min |
| Jun 25, 3:49 PM MDT | Mesoscale Discussion | SPC | Butte, Custer, Fall River, Harding, Jackson, Lawrence and 3 more | 56 min |
Nearby
Tornado Watches in South Dakota, 2009Every tornado watch in 2009
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.