Alert archive / Minnesota / Severe Thunderstorm Watches in 2004
Severe Thunderstorm Watch 662
The Storm Prediction Center issued this severe thunderstorm watch at Jul 21, 2004, 1:50 PM CDT for 15 counties in Minnesota; 13 counties in South Dakota. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 21, 2004, 1:50 PM CDT (18:50 UTC)
- Expired
- Jul 21, 2004, 7:00 PM CDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
All 28 counties
Big Stone County, MN, Chippewa County, MN, Douglas County, MN, Grant County, MN, Kandiyohi County, MN, Lac qui Parle County, MN, Lincoln County, MN, Lyon County, MN, Pope County, MN, Redwood County, MN, Renville County, MN, Stevens County, MN, Swift County, MN, Traverse County, MN, Yellow Medicine County, MN, Beadle County, SD, Brookings County, SD, Brown County, SD, Clark County, SD, Codington County, SD, Day County, SD, Deuel County, SD, Grant County, SD, Hamlin County, SD, Kingsbury County, SD, Marshall County, SD, Roberts County, SD, Spink County, SD
The radar
The Aberdeen radar (KABR), 91 km from the middle of the area, began a volume at 18:50 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
8 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 21, 2:52 PM CDT | Severe Thunderstorm Warning | ABR | Marshall | 23 min |
| Jul 21, 3:17 PM CDT | Severe Thunderstorm Warning | ABR | Brown | 28 min |
| Jul 21, 3:45 PM CDT | Severe Thunderstorm Warning | ABR | Brown, Day | 60 min |
| Jul 21, 4:07 PM CDT | Severe Thunderstorm Warning | FGF | Grant, Otter Tail | 53 min |
| Jul 21, 5:31 PM CDT | Severe Thunderstorm Warning | ABR | Clark | 29 min |
| Jul 21, 5:40 PM CDT | Severe Thunderstorm Warning | ABR | Codington, Deuel, Hamlin | 50 min |
| Jul 21, 6:28 PM CDT | Severe Thunderstorm Warning | MPX | Chippewa | 32 min |
| Jul 21, 6:48 PM CDT | Severe Thunderstorm Warning | MPX | Kandiyohi, Renville, Yellow Medicine | 57 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, 6.8 hours before the alert went out and 96 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
- 220 J/kg
- Mixed-layer CIN
- -217 J/kg
- Mixed-layer LCL
- 1834 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- -20 m²/s²
- 0-3 km storm-relative helicity
- -6 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 |
|---|---|---|---|---|
| Jul 20, 9:00 PM CDT | Severe Thunderstorm Watch | SPC | Big Stone, Chippewa, Cottonwood, Jackson, Kandiyohi, Lac qui Parle and 10 more | 4 hr |
| 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, 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 | Campbell, Corson, Dewey, Edmunds, McPherson, Perkins and 3 more | 85 min |
Nearby
Severe Thunderstorm Watches in Minnesota, 2004Severe Thunderstorm Watches in South 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.