Alert archive / South Dakota / Tornado Watches in 2004
Tornado Watch 682
The Storm Prediction Center issued this tornado watch at Aug 1, 2004, 7:45 PM CDT for 32 counties in South Dakota. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 1, 2004, 7:45 PM CDT (00:45 UTC)
- Expired
- Aug 2, 2004, 2:00 AM CDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
All 32 counties
Beadle County, SD, Brookings County, SD, Brown County, SD, Buffalo County, SD, Campbell County, SD, Clark County, SD, Codington County, SD, Corson County, SD, Day County, SD, Deuel County, SD, Dewey County, SD, Edmunds County, SD, Faulk County, SD, Grant County, SD, Hamlin County, SD, Hand County, SD, Hughes County, SD, Hyde County, SD, Jerauld County, SD, Kingsbury County, SD, Lake County, SD, Marshall County, SD, McPherson County, SD, Miner County, SD, Moody County, SD, Potter County, SD, Roberts County, SD, Sanborn County, SD, Spink County, SD, Stanley County, SD, Sully County, SD, Walworth County, SD
The radar
The Aberdeen radar (KABR), 82 km from the middle of the area, began a volume at 00:46 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.
Warnings issued inside it
16 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 1, 8:43 PM CDT | Severe Thunderstorm Warning | ABR | Dewey | 47 min |
| Aug 1, 9:15 PM CDT | Severe Thunderstorm Warning | ABR | Potter, Sully | 45 min |
| Aug 1, 9:57 PM CDT | Severe Thunderstorm Warning | ABR | Hughes, Sully | 48 min |
| Aug 1, 10:41 PM CDT | Severe Thunderstorm Warning | ABR | Hughes, Hyde | 34 min |
| Aug 1, 11:12 PM CDT | Severe Thunderstorm Warning | ABR | Buffalo, Hand, Hyde | 33 min |
| Aug 1, 11:19 PM CDT | Severe Thunderstorm Warning | FSD | Beadle | 41 min |
| Aug 1, 11:35 PM CDT | Severe Thunderstorm Warning | FSD | Jerauld | 40 min |
| Aug 1, 11:42 PM CDT | Severe Thunderstorm Warning | ABR | Buffalo, Hand | 18 min |
| Aug 1, 11:51 PM CDT | Severe Thunderstorm Warning | ABR | Clark, Spink | 54 min |
| Aug 1, 11:57 PM CDT | Severe Thunderstorm Warning | FSD | Sanborn | 48 min |
| Aug 1, 11:59 PM CDT | Severe Thunderstorm Warning | FSD | Beadle | 31 min |
| Aug 2, 12:11 AM CDT | Severe Thunderstorm Warning | FSD | Kingsbury | 49 min |
| Aug 2, 12:16 AM CDT | Severe Thunderstorm Warning | FSD | Jerauld | 29 min |
| Aug 2, 12:23 AM CDT | Severe Thunderstorm Warning | FSD | Miner | 37 min |
| Aug 2, 12:56 AM CDT | Severe Thunderstorm Warning | FSD | Lake | 34 min |
| Aug 2, 1:00 AM CDT | Severe Thunderstorm Warning | FSD | Aurora, Douglas, Miner | 30 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, 0.8 hours before the alert went out and 79 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
- 3501 J/kg
- Mixed-layer CIN
- -27 J/kg
- Mixed-layer LCL
- 1092 m above ground
- 0-6 km bulk shear
- 49 kt
- 0-1 km storm-relative helicity
- 112 m²/s²
- 0-3 km storm-relative helicity
- 305 m²/s²
- Significant tornado parameter
- 3.8
- Supercell composite
- 15.7
The text
As transmitted, in the capitals the NWS used until 2016.
000
WWUS20 KWNS 020045
SEL2
SPC WW 020045
SDZ000-020700-
URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 682
NWS STORM PREDICTION CENTER NORMAN OK
745 PM CDT SUN AUG 1 2004
THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF
CENTRAL AND EASTERN SOUTH DAKOTA
EFFECTIVE THIS SUNDAY NIGHT AND MONDAY MORNING FROM 745 PM UNTIL
200 AM CDT.
TORNADOES...HAIL TO 3 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS
TO 80 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.
THE TORNADO WATCH AREA IS ALONG AND 65 STATUTE MILES NORTH AND
SOUTH OF A LINE FROM 55 MILES SOUTHWEST OF MOBRIDGE SOUTH DAKOTA
TO 30 MILES EAST OF WATERTOWN SOUTH DAKOTA.
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...THIS TORNADO WATCH REPLACES TORNADO
WATCH NUMBER 678...SEVERE THUNDERSTORM WATCH NUMBER 681. WATCH
NUMBER 678 681 WILL NOT BE IN EFFECT AFTER 745 PM CDT.
CONTINUE...WW 679...WW 680...
DISCUSSION...RAPIDLY INTENSIFYING SEVERE THUNDERSTORMS OVER NCENTRAL
SD EXPECTED TO MOVE E/SE INTO A VERY UNSTABLE AIR MASS. WITH
STRONG VEERING SHEAR PROFILES NOTED ON 00Z ABR SOUNDING...CONDITIONS
NOW FAVORABLE FOR TORNADIC SUPERCELLS. ADDITIONALLY WITH MLCAPES TO
4000 J/KG ERN SD...VERY LARGE HAIL AND DAMAGING DOWNBURST WINDS ARE
LIKELY.
AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 3 INCHES. EXTREME TURBULENCE AND SURFACE WIND
GUSTS TO 70 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 600.
MEAN STORM MOTION VECTOR 30030.
...HALES
455,1011 455,0963 435,0963 440,1011SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 1, 7:22 PM CDT | Mesoscale Discussion | SPC | Beadle, Brookings, Brown, Campbell, Clark, Codington and 17 more | 53 min |
| Aug 1, 10:00 PM CDT | Mesoscale Discussion | SPC | Beadle, Buffalo, Campbell, Edmunds, Faulk, Hand and 7 more | 60 min |
| Aug 1, 10:35 PM CDT | Severe Thunderstorm Watch | SPC | Aurora, Bon Homme, Brule, Charles Mix, Clay, Davison and 6 more | 5 hr |
| Aug 1, 11:29 PM CDT | Mesoscale Discussion | SPC | Aurora, Beadle, Bon Homme, Brule, Buffalo, Charles Mix and 19 more | 61 min |
| Aug 2, 12:20 AM CDT | Severe Thunderstorm Watch | SPC | Lake, Lincoln, Minnehaha, Moody, Union | 4 hr |
| Aug 2, 3:02 AM CDT | Mesoscale Discussion | SPC | Bon Homme, Clay, Lincoln, Turner, Union, Yankton | 58 min |
| Aug 2, 3:12 PM CDT | Mesoscale Discussion | SPC | Beadle, Brookings, Clark, Deuel, Hamlin, Jerauld and 7 more | 2 hr |
| Aug 2, 3:50 PM CDT | Severe Thunderstorm Watch | SPC | Brookings, Davison, Hanson, Kingsbury, Lake, McCook and 4 more | 5 hr |
| Aug 2, 4:23 PM CDT | Mesoscale Discussion | SPC | Bon Homme, Charles Mix, Clay, Douglas, Gregory, Hutchinson and 5 more | 37 min |
| Aug 2, 6:30 PM CDT | Severe Thunderstorm Watch | SPC | Aurora, Bennett, Bon Homme, Brule, Buffalo, Charles Mix and 17 more | 6 hr |
Nearby
Tornado Watches in South Dakota, 2004Every tornado watch in 2004
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.