Alert archive / South Dakota / Tornado Watches in 2006
Tornado Watch 277
The Storm Prediction Center issued this tornado watch at May 2, 2006, 3:06 PM CDT for 4 states. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- May 2, 2006, 3:06 PM CDT (20:06 UTC)
- Expired
- May 2, 2006, 10:00 PM CDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
All 47 counties
Cherokee County, IA, Ida County, IA, Lyon County, IA, Monona County, IA, O'Brien County, IA, Osceola County, IA, Plymouth County, IA, Sioux County, IA, Woodbury County, IA, Lincoln County, MN, Lyon County, MN, Murray County, MN, Nobles County, MN, Pipestone County, MN, Rock County, MN, Burt County, NE, Cedar County, NE, Cuming County, NE, Dakota County, NE, Dixon County, NE, Madison County, NE, Pierce County, NE, Stanton County, NE, Thurston County, NE, Wayne County, NE, Beadle County, SD, Brookings County, SD, Clark County, SD, Clay County, SD, Codington County, SD, Davison County, SD, Deuel County, SD, Grant County, SD, Hamlin County, SD, Hanson County, SD, Kingsbury County, SD, Lake County, SD, Lincoln County, SD, McCook County, SD, Miner County, SD, Minnehaha County, SD, Moody County, SD, Sanborn County, SD, Spink County, SD, Turner County, SD, Union County, SD, Yankton County, SD
The radar
The Sioux Falls radar (KFSD), 42 km from the middle of the area, began a volume at 20:08 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
- 20%
- Ten or more severe hail reports
- 60%
- One or more hailstones of 2 inches or more
- 30%
- Six or more combined severe hail and wind reports
- 80%
Warnings issued inside it
13 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 2, 4:20 PM CDT | Severe Thunderstorm Warning | FSD | Clay | 25 min |
| May 2, 4:35 PM CDT | Severe Thunderstorm Warning | FSD | Union | 25 min |
| May 2, 4:59 PM CDT | Severe Thunderstorm Warning | FSD | Union | 31 min |
| May 2, 5:08 PM CDT | Severe Thunderstorm Warning | FSD | Sioux | 24 min |
| May 2, 6:19 PM CDT | Severe Thunderstorm Warning | ABR | Hamlin | 26 min |
| May 2, 6:20 PM CDT | Tornado Warning | FSD | Kingsbury | 25 min |
| May 2, 6:35 PM CDT | Tornado Warning | FSD | Brookings | 17 min |
| May 2, 6:41 PM CDT | Tornado Warning | FSD | Kingsbury | 8 min |
| May 2, 7:05 PM CDT | Severe Thunderstorm Warning | ABR | Codington, Deuel | 25 min |
| May 2, 7:31 PM CDT | Severe Thunderstorm Warning | ABR | Deuel | 29 min |
| May 2, 7:40 PM CDT | Severe Thunderstorm Warning | OAX | Cuming | 35 min |
| May 2, 7:47 PM CDT | Severe Thunderstorm Warning | OAX | Stanton | 23 min |
| May 2, 8:16 PM CDT | Severe Thunderstorm Warning | OAX | Cuming | 29 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 12:00Z, 8.1 hours before the alert went out and 275 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1669 m above ground
- 0-6 km bulk shear
- 50 kt
- 0-1 km storm-relative helicity
- 150 m²/s²
- 0-3 km storm-relative helicity
- 186 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 |
|---|---|---|---|---|
| May 2, 2:23 PM CDT | Mesoscale Discussion | SPC | Cherokee, Lyon, Monona, O'Brien, Osceola, Plymouth and 2 more | 2 hr |
| May 2, 5:46 PM CDT | Mesoscale Discussion | SPC | Buena Vista, Cherokee, Clay, Dickinson, Ida, Lyon and 6 more | 89 min |
Nearby
Tornado Watches in South Dakota, 2006Tornado Watches in Nebraska, 2006Tornado Watches in Iowa, 2006Every tornado watch in 2006
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.