Alert archive / South Dakota / Tornado Watches in 2008
Tornado Watch 680
The Storm Prediction Center issued this tornado watch at Jul 10, 2008, 7:36 PM CDT for 9 counties in Minnesota; 8 counties in North Dakota; 16 counties in South Dakota. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 10, 2008, 7:36 PM CDT (00:36 UTC)
- Expired
- Jul 11, 2008, 1:24 AM CDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
All 33 counties
Becker County, MN, Big Stone County, MN, Clay County, MN, Grant County, MN, Mahnomen County, MN, Norman County, MN, Otter Tail County, MN, Traverse County, MN, Wilkin County, MN, Barnes County, ND, Cass County, ND, Griggs County, ND, Ransom County, ND, Richland County, ND, Sargent County, ND, Steele County, ND, Traill County, ND, Brown County, SD, Campbell County, SD, Clark County, SD, Codington County, SD, Day County, SD, Deuel County, SD, Edmunds County, SD, Faulk County, SD, Grant County, SD, Hamlin County, SD, Marshall County, SD, McPherson County, SD, Potter County, SD, Roberts County, SD, Spink County, SD, Walworth County, SD
The radar
The Fargo/Grand Forks radar (KMVX), 115 km from the middle of the area, began a volume at 00:39 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
- 10%
- Ten or more severe wind reports
- 40%
- One or more gusts of 65 knots or more
- 20%
- 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
12 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 10, 7:50 PM CDT | Severe Thunderstorm Warning | ABR | Brown, Edmunds, McPherson | 28 min |
| Jul 10, 8:14 PM CDT | Severe Thunderstorm Warning | ABR | Campbell, Edmunds, McPherson, Walworth | 46 min |
| Jul 10, 8:24 PM CDT | Severe Thunderstorm Warning | ABR | Campbell, Corson | 51 min |
| Jul 10, 8:28 PM CDT | Severe Thunderstorm Warning | FGF | Ransom, Richland, Sargent | 62 min |
| Jul 10, 9:00 PM CDT | Severe Thunderstorm Warning | ABR | Campbell, McPherson | 45 min |
| Jul 10, 9:30 PM CDT | Severe Thunderstorm Warning | ABR | Campbell, Edmunds, McPherson, Walworth | 45 min |
| Jul 10, 9:37 PM CDT | Severe Thunderstorm Warning | ABR | Edmunds, McPherson | 38 min |
| Jul 10, 9:59 PM CDT | Severe Thunderstorm Warning | ABR | Big Stone, Traverse | 61 min |
| Jul 10, 10:12 PM CDT | Severe Thunderstorm Warning | ABR | Brown, Edmunds, McPherson, Spink | 33 min |
| Jul 10, 10:23 PM CDT | Severe Thunderstorm Warning | FGF | Otter Tail, Wilkin | 67 min |
| Jul 10, 11:18 PM CDT | Severe Thunderstorm Warning | FGF | Grant, Otter Tail | 57 min |
| Jul 10, 11:55 PM CDT | Severe Thunderstorm Warning | ABR | Big Stone | 35 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, 0.6 hours before the alert went out and 189 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
- 2257 J/kg
- Mixed-layer CIN
- -127 J/kg
- Mixed-layer LCL
- 2064 m above ground
- 0-6 km bulk shear
- 36 kt
- 0-1 km storm-relative helicity
- 104 m²/s²
- 0-3 km storm-relative helicity
- 156 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 4.5
The text
As transmitted, in the capitals the NWS used until 2016.
000
WWUS20 KWNS 110037
SEL0
SPC WW 110037
MNZ000-NDZ000-SDZ000-110700-
URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 680
NWS STORM PREDICTION CENTER NORMAN OK
740 PM CDT THU JUL 10 2008
THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF
PARTS OF WESTERN MINNESOTA
PARTS OF SOUTHEASTERN NORTH DAKOTA
PARTS OF NORTHERN SOUTH DAKOTA
EFFECTIVE THIS THURSDAY NIGHT AND FRIDAY MORNING FROM 740 PM
UNTIL 200 AM CDT.
TORNADOES...HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.
THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 100 STATUTE
MILES EAST AND WEST OF A LINE FROM 55 MILES NORTH NORTHEAST OF
FARGO NORTH DAKOTA TO 45 MILES SOUTH SOUTHWEST OF ABERDEEN SOUTH
DAKOTA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED
WATCH OUTLINE UPDATE (WOUS64 KWNS WOU0).
REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH
AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR
THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS
AND POSSIBLE WARNINGS.
OTHER WATCH INFORMATION...CONTINUE...WW 677...WW 678...WW 679...
DISCUSSION...SUPERCELLS OVER CENTRAL ND WILL CONTINUE DEVELOPING
E/SE INTO A VERY MOIST AND UNSTABLE AIR MASS. WITH DEEP LAYER SHEAR
REMAINING FAVORABLE FOR SUPERCELLS...THE THREAT FOR TORNADOES AND
VERY LARGE HAIL/WIND DAMAGE WILL CONTINUE AFTER DARK.
AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
550. MEAN STORM MOTION VECTOR 28030.
...HALESSPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 10, 9:59 PM CDT | Mesoscale Discussion | SPC | Becker, Big Stone, Clay, Grant, Mahnomen, Norman and 3 more | 91 min |
| Jul 10, 11:19 PM CDT | Severe Thunderstorm Watch | SPC | Beltrami, Clearwater, Kittson, Lake of the Woods, Marshall, Pennington and 3 more | 8 hr |
| Jul 10, 11:41 PM CDT | Severe Thunderstorm Watch | SPC | Anoka, Benton, Blue Earth, Brown, Carver, Chippewa and 30 more | 5 hr |
| Jul 11, 2:15 AM CDT | Mesoscale Discussion | SPC | Anoka, Benton, Blue Earth, Brown, Carver, Chippewa and 32 more | 60 min |
| Jul 11, 4:11 AM CDT | Mesoscale Discussion | SPC | Kittson, Lake of the Woods, Roseau | 94 min |
| Jul 11, 6:36 AM CDT | Mesoscale Discussion | SPC | Beltrami, Clearwater, Kittson, Lake of the Woods, Marshall, Pennington and 3 more | 24 min |
| Jul 11, 7:42 AM CDT | Mesoscale Discussion | SPC | Koochiching, Lake of the Woods | 63 min |
| Jul 11, 12:37 PM CDT | Mesoscale Discussion | SPC | Becker, Beltrami, Clay, Clearwater, Douglas, Grant and 15 more | 83 min |
| Jul 11, 2:26 PM CDT | Tornado Watch | SPC | Aitkin, Becker, Beltrami, Benton, Big Stone, Cass and 39 more | 6 hr |
| Jul 11, 3:13 PM CDT | Mesoscale Discussion | SPC | Brown, Cottonwood, Jackson, Lyon, Martin, Murray and 5 more | 92 min |
| Jul 11, 4:02 PM CDT | Mesoscale Discussion | SPC | Aitkin, Beltrami, Benton, Cass, Chippewa, Clearwater and 18 more | 88 min |
| Jul 11, 5:08 PM CDT | Severe Thunderstorm Watch | SPC | Blue Earth, Brown, Cottonwood, Faribault, Jackson, Le Sueur and 9 more | 7 hr |
| Jul 11, 5:50 PM CDT | Mesoscale Discussion | SPC | Aitkin, Becker, Beltrami, Benton, Big Stone, Cass and 39 more | 85 min |
| Jul 11, 6:13 PM CDT | Severe Thunderstorm Watch | SPC | Anoka, Carlton, Carver, Chisago, Cook, Dakota and 9 more | 7 hr |
Nearby
Tornado Watches in South Dakota, 2008Tornado Watches in Minnesota, 2008Tornado Watches in North 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.