Alert archive / South Dakota / Severe Thunderstorm Watches in 2004
Severe Thunderstorm Watch 660
The Storm Prediction Center issued this severe thunderstorm watch at Jul 20, 2004, 9:00 PM CDT for 16 counties in Minnesota; McIntosh County, North Dakota; 24 counties in South Dakota. It was in force for 4 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 20, 2004, 9:00 PM CDT (02:00 UTC)
- Expired
- Jul 21, 2004, 1:00 AM CDT
- In force
- 4 hr
- Issued by
- the Storm Prediction Center
All 41 counties
Big Stone County, MN, Chippewa County, MN, Cottonwood County, MN, Jackson County, MN, Kandiyohi County, MN, Lac qui Parle County, MN, Lincoln County, MN, Lyon County, MN, Meeker County, MN, Murray County, MN, Nobles County, MN, Pipestone County, MN, Redwood County, MN, Renville County, MN, Swift County, MN, Yellow Medicine County, MN, McIntosh County, ND, Beadle County, SD, Brookings County, SD, Brown 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, Hand County, SD, Hyde 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, Spink County, SD, Sully County, SD, Walworth County, SD
The radar
The Aberdeen radar (KABR), 51 km from the middle of the area, began a volume at 02:02 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
12 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 20, 9:08 PM CDT | Severe Thunderstorm Warning | ABR | Campbell, McPherson | 67 min |
| Jul 20, 9:13 PM CDT | Severe Thunderstorm Warning | ABR | Walworth | 32 min |
| Jul 20, 9:18 PM CDT | Severe Thunderstorm Warning | BIS | McIntosh | 57 min |
| Jul 20, 9:44 PM CDT | Severe Thunderstorm Warning | ABR | Faulk, Potter | 46 min |
| Jul 20, 9:58 PM CDT | Severe Thunderstorm Warning | ABR | Hyde, Sully | 32 min |
| Jul 20, 10:10 PM CDT | Severe Thunderstorm Warning | ABR | Deuel | 50 min |
| Jul 20, 10:25 PM CDT | Severe Thunderstorm Warning | MPX | Lac qui Parle, Yellow Medicine | 50 min |
| Jul 20, 11:03 PM CDT | Severe Thunderstorm Warning | ABR | Brown | 27 min |
| Jul 20, 11:28 PM CDT | Severe Thunderstorm Warning | ABR | Brown | 47 min |
| Jul 20, 11:57 PM CDT | Severe Thunderstorm Warning | ABR | Clark, Day | 33 min |
| Jul 21, 12:26 AM CDT | Severe Thunderstorm Warning | MPX | Brown, Redwood | 49 min |
| Jul 21, 12:39 AM CDT | Severe Thunderstorm Warning | FSD | Cottonwood | 36 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, 2.0 hours before the alert went out and 52 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
- 1682 J/kg
- Mixed-layer CIN
- -82 J/kg
- Mixed-layer LCL
- 1599 m above ground
- 0-6 km bulk shear
- 33 kt
- 0-1 km storm-relative helicity
- 23 m²/s²
- 0-3 km storm-relative helicity
- 135 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.0
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 20, 11:08 PM CDT | Mesoscale Discussion | SPC | Blue Earth, Carver, Dakota, Dodge, Faribault, Fillmore and 14 more | 97 min |
| Jul 21, 1:30 PM CDT | Mesoscale Discussion | SPC | Big Stone, Lac qui Parle, Traverse | 2 hr |
| Jul 21, 1:50 PM CDT | Severe Thunderstorm Watch | SPC | Big Stone, Chippewa, Douglas, Grant, Kandiyohi, Lac qui Parle and 9 more | 5 hr |
| Jul 21, 3:43 PM CDT | Mesoscale Discussion | SPC | Cottonwood, Jackson, Murray, Nobles, Pipestone, Rock | 92 min |
| Jul 21, 6:02 PM CDT | Mesoscale Discussion | SPC | Aitkin, Becker, Beltrami, Benton, Big Stone, Cass and 37 more | 118 min |
| Jul 20, 7:20 PM CDT | Mesoscale Discussion | SPC | Adams, Benson, Bottineau, Burleigh, Cavalier, Eddy and 22 more | 85 min |
Nearby
Severe Thunderstorm Watches in South Dakota, 2004Severe Thunderstorm Watches in Minnesota, 2004Severe Thunderstorm Watches in North Dakota, 2004Every severe thunderstorm 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.