Alert archive / South Dakota / Severe Thunderstorm Watches in 2004
Severe Thunderstorm Watch 83
The Storm Prediction Center issued this severe thunderstorm watch at Apr 18, 2004, 2:20 PM CDT for 4 counties in Minnesota; 14 counties in Nebraska; 22 counties in South Dakota. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 18, 2004, 2:20 PM CDT (19:20 UTC)
- Expired
- Apr 18, 2004, 8:00 PM CDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
All 40 counties
Lincoln County, MN, Lyon County, MN, Pipestone County, MN, Rock County, MN, Antelope County, NE, Boyd County, NE, Cedar County, NE, Dixon County, NE, Garfield County, NE, Holt County, NE, Knox County, NE, Loup County, NE, Madison County, NE, Pierce County, NE, Rock County, NE, Stanton County, NE, Wayne County, NE, Wheeler County, NE, Aurora County, SD, Beadle County, SD, Bon Homme County, SD, Brookings County, SD, Charles Mix County, SD, Clay County, SD, Davison County, SD, Douglas County, SD, Hanson County, SD, Hutchinson County, SD, Jerauld 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, Turner County, SD, Union County, SD, Yankton County, SD
The radar
The Sioux Falls radar (KFSD), 142 km from the middle of the area, began a volume at 19:20 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
47 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 18, 2:37 PM CDT | Severe Thunderstorm Warning | LBF | Brown, Keya Paha, Rock | 53 min |
| Apr 18, 3:07 PM CDT | Severe Thunderstorm Warning | LBF | Holt | 53 min |
| Apr 18, 3:43 PM CDT | Severe Thunderstorm Warning | LBF | Boyd | 62 min |
| Apr 18, 3:44 PM CDT | Severe Thunderstorm Warning | OAX | Madison | 31 min |
| Apr 18, 3:49 PM CDT | Severe Thunderstorm Warning | FSD | Charles Mix | 26 min |
| Apr 18, 3:52 PM CDT | Severe Thunderstorm Warning | FSD | Aurora | 23 min |
| Apr 18, 3:56 PM CDT | Severe Thunderstorm Warning | FSD | Union | 34 min |
| Apr 18, 3:59 PM CDT | Severe Thunderstorm Warning | LBF | Holt | 31 min |
| Apr 18, 3:59 PM CDT | Severe Thunderstorm Warning | FSD | Sanborn | 46 min |
| Apr 18, 4:00 PM CDT | Severe Thunderstorm Warning | OAX | Stanton, Wayne | 30 min |
| Apr 18, 4:13 PM CDT | Severe Thunderstorm Warning | FSD | Bon Homme | 32 min |
| Apr 18, 4:18 PM CDT | Severe Thunderstorm Warning | FSD | Hutchinson | 42 min |
| Apr 18, 4:31 PM CDT | Severe Thunderstorm Warning | FSD | Miner | 29 min |
| Apr 18, 4:38 PM CDT | Tornado Warning | FSD | Hutchinson | 37 min |
| Apr 18, 4:45 PM CDT | Severe Thunderstorm Warning | OAX | Madison | 30 min |
| Apr 18, 4:45 PM CDT | Severe Thunderstorm Warning | FSD | Union | 30 min |
| Apr 18, 4:46 PM CDT | Tornado Warning | FSD | Turner | 29 min |
| Apr 18, 4:50 PM CDT | Severe Thunderstorm Warning | FSD | Kingsbury | 25 min |
| Apr 18, 4:52 PM CDT | Severe Thunderstorm Warning | FSD | Lincoln | 38 min |
| Apr 18, 4:59 PM CDT | Severe Thunderstorm Warning | FSD | Brookings, Lake | 46 min |
| Apr 18, 5:11 PM CDT | Severe Thunderstorm Warning | FSD | Murray, Nobles, Rock | 49 min |
| Apr 18, 5:13 PM CDT | Tornado Warning | FSD | Union | 47 min |
| Apr 18, 5:14 PM CDT | Severe Thunderstorm Warning | OAX | Cedar | 31 min |
| Apr 18, 5:17 PM CDT | Severe Thunderstorm Warning | FSD | Lincoln, Minnehaha | 28 min |
| Apr 18, 5:23 PM CDT | Severe Thunderstorm Warning | FSD | Clay | 37 min |
| Apr 18, 5:26 PM CDT | Tornado Warning | OAX | Pierce | 34 min |
| Apr 18, 5:26 PM CDT | Severe Thunderstorm Warning | FSD | Brookings | 34 min |
| Apr 18, 5:34 PM CDT | Severe Thunderstorm Warning | FSD | Rock | 26 min |
| Apr 18, 5:42 PM CDT | Tornado Warning | OAX | Cedar | 33 min |
| Apr 18, 5:44 PM CDT | Severe Thunderstorm Warning | FSD | Lincoln, Lyon | 46 min |
| Apr 18, 5:46 PM CDT | Severe Thunderstorm Warning | FSD | Lincoln, Lyon | 44 min |
| Apr 18, 5:47 PM CDT | Severe Thunderstorm Warning | FSD | Dixon | 43 min |
| Apr 18, 5:47 PM CDT | Flash Flood Warning | FSD | Union | 58 min |
| Apr 18, 5:50 PM CDT | Tornado Warning | OAX | Wayne | 30 min |
| Apr 18, 5:57 PM CDT | Tornado Warning | OAX | Pierce | 33 min |
| Apr 18, 5:59 PM CDT | Severe Thunderstorm Warning | OAX | Madison | 31 min |
| Apr 18, 6:16 PM CDT | Severe Thunderstorm Warning | LBF | Loup | 14 min |
| Apr 18, 6:16 PM CDT | Severe Thunderstorm Warning | OAX | Cedar | 29 min |
| Apr 18, 6:20 PM CDT | Tornado Warning | OAX | Wayne | 25 min |
| Apr 18, 6:29 PM CDT | Severe Thunderstorm Warning | FSD | Dixon | 46 min |
| Apr 18, 6:29 PM CDT | Severe Thunderstorm Warning | OAX | Madison, Platte, Stanton | 46 min |
| Apr 18, 6:30 PM CDT | Severe Thunderstorm Warning | FSD | Lyon | 30 min |
| Apr 18, 6:32 PM CDT | Severe Thunderstorm Warning | LBF | Loup | 28 min |
| Apr 18, 6:40 PM CDT | Severe Thunderstorm Warning | LBF | Garfield | 35 min |
| Apr 18, 6:46 PM CDT | Severe Thunderstorm Warning | OAX | Wayne | 44 min |
| Apr 18, 6:55 PM CDT | Severe Thunderstorm Warning | FSD | Union | 50 min |
| Apr 18, 7:13 PM CDT | Severe Thunderstorm Warning | OAX | Madison, Platte, Stanton | 47 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 12:00Z, 7.3 hours before the alert went out and 223 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
- 5 J/kg
- Mixed-layer CIN
- -600 J/kg
- Mixed-layer LCL
- 648 m above ground
- 0-6 km bulk shear
- 75 kt
- 0-1 km storm-relative helicity
- 257 m²/s²
- 0-3 km storm-relative helicity
- 268 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -7.6
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 17, 7:45 PM CDT | Severe Thunderstorm Watch | SPC | Blue Earth, Dodge, Faribault, Fillmore, Freeborn, Houston and 7 more | 5 hr |
| Apr 17, 9:31 PM CDT | Mesoscale Discussion | SPC | Blue Earth, Dodge, Faribault, Fillmore, Freeborn, Houston and 7 more | 119 min |
| Apr 17, 10:05 PM CDT | Tornado Watch | SPC | Blue Earth, Dodge, Faribault, Fillmore, Freeborn, Houston and 7 more | 5 hr |
| Apr 17, 11:10 PM CDT | Mesoscale Discussion | SPC | Big Stone, Chippewa, Cottonwood, Grant, Jackson, Kandiyohi and 14 more | 95 min |
| Apr 17, 11:35 PM CDT | Severe Thunderstorm Watch | SPC | Big Stone, Brown, Chippewa, Cottonwood, Jackson, Kandiyohi and 16 more | 5 hr |
| Apr 17, 11:50 PM CDT | Mesoscale Discussion | SPC | Blue Earth, Dodge, Faribault, Fillmore, Freeborn, Houston and 7 more | 85 min |
| Apr 18, 12:30 AM CDT | Severe Thunderstorm Watch | SPC | Anoka, Carver, Chisago, Dakota, Goodhue, Hennepin and 11 more | 5 hr |
| Apr 18, 2:37 AM CDT | Mesoscale Discussion | SPC | Aitkin, Anoka, Benton, Big Stone, Brown, Carlton and 40 more | 53 min |
| Apr 18, 4:43 AM CDT | Mesoscale Discussion | SPC | Aitkin, Benton, Carlton, Cass, Chisago, Crow Wing and 15 more | 32 min |
| Apr 18, 8:04 AM CDT | Mesoscale Discussion | SPC | Aitkin, Benton, Carlton, Cass, Crow Wing, Douglas and 6 more | 86 min |
| Apr 18, 12:39 PM CDT | Mesoscale Discussion | SPC | Aitkin, Anoka, Benton, Big Stone, Carlton, Carver and 32 more | 2 hr |
| Apr 18, 1:40 PM CDT | Tornado Watch | SPC | Aitkin, Anoka, Benton, Carlton, Carver, Chippewa and 32 more | 6 hr |
| Apr 18, 3:33 PM CDT | Mesoscale Discussion | SPC | Aitkin, Anoka, Benton, Carlton, Chisago, Crow Wing and 12 more | 117 min |
| Apr 18, 4:15 PM CDT | Mesoscale Discussion | SPC | Blue Earth, Brown, Cottonwood, Dodge, Faribault, Fillmore and 15 more | 60 min |
| Apr 18, 4:40 PM CDT | Tornado Watch | SPC | Blue Earth, Cottonwood, Dodge, Faribault, Freeborn, Jackson and 6 more | 5 hr |
| Apr 18, 5:23 PM CDT | Mesoscale Discussion | SPC | Lincoln, Lyon, Pipestone, Rock | 2 hr |
| Apr 18, 6:35 PM CDT | Tornado Watch | SPC | Brown, Carver, Dakota, Goodhue, Hennepin, Le Sueur and 7 more | 5 hr |
| Apr 18, 1:42 PM CDT | Mesoscale Discussion | SPC | Arthur, Blaine, Boyd, Brown, Cherry, Grant and 10 more | 3 hr |
Nearby
Severe Thunderstorm Watches in South Dakota, 2004Severe Thunderstorm Watches in Nebraska, 2004Severe Thunderstorm Watches in Minnesota, 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.