Alert archive / Minnesota / Mesoscale Discussions in 2009
Mesoscale Discussion 1504
The Storm Prediction Center issued this mesoscale discussion at Jul 9, 2009, 6:34 PM CDT for 4 states. It was in force for 86 min.
The area
The outline as issued.
The facts
- Issued
- Jul 9, 2009, 6:34 PM CDT (23:34 UTC)
- Expired
- Jul 9, 2009, 8:00 PM CDT
- In force
- 86 min
- Issued by
- the Storm Prediction Center
All 30 counties
Lyon County, IA, Osceola County, IA, Plymouth County, IA, Sioux County, IA, Chippewa County, MN, Cottonwood County, MN, Lincoln County, MN, Lyon County, MN, Murray County, MN, Nobles County, MN, Pipestone County, MN, Redwood County, MN, Rock County, MN, Swift County, MN, Yellow Medicine County, MN, Antelope County, NE, Cedar County, NE, Dakota County, NE, Dixon County, NE, Knox County, NE, Madison County, NE, Pierce County, NE, Wayne County, NE, Clay County, SD, Lincoln County, SD, Minnehaha County, SD, Moody County, SD, Turner County, SD, Union County, SD, Yankton County, SD
The radar
The Sioux Falls radar (KFSD), 17 km from the middle of the area, began a volume at 23:35 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.
The watches that followed
Watches SPC issued over any of the same counties within four hours of this discussion.
The nearest sounding before it
Omaha, NE (KOAX), launched 12:00Z, 11.6 hours before the alert went out and 250 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
- 709 J/kg
- Mixed-layer CIN
- -249 J/kg
- Mixed-layer LCL
- 678 m above ground
- 0-6 km bulk shear
- 35 kt
- 0-1 km storm-relative helicity
- 21 m²/s²
- 0-3 km storm-relative helicity
- 65 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.5
The text
As transmitted, in the capitals the NWS used until 2016.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 9, 3:07 AM CDT | Mesoscale Discussion | SPC | Lyon, Plymouth, Sioux | 83 min |
| Jul 9, 3:41 AM CDT | Severe Thunderstorm Watch | SPC | Buena Vista, Cherokee, Clay, Dickinson, Ida, Lyon and 6 more | 6 hr |
| Jul 9, 5:56 AM CDT | Mesoscale Discussion | SPC | Cherokee, Crawford, Harrison, Ida, Monona, Plymouth and 2 more | 94 min |
| Jul 9, 9:32 AM CDT | Severe Thunderstorm Watch | SPC | Adair, Adams, Audubon, Cass, Crawford, Fremont and 9 more | 4 hr |
| Jul 9, 11:54 AM CDT | Mesoscale Discussion | SPC | Adair, Adams, Appanoose, Audubon, Cass, Clarke and 16 more | 96 min |
| Jul 9, 2:57 PM CDT | Mesoscale Discussion | SPC | Buena Vista, Cerro Gordo, Cherokee, Clay, Dickinson, Emmet and 18 more | 93 min |
| Jul 9, 3:20 PM CDT | Mesoscale Discussion | SPC | Aitkin, Becker, Beltrami, Benton, Cass, Clearwater and 16 more | 85 min |
| Jul 8, 9:42 PM CDT | Mesoscale Discussion | SPC | Bennett, Campbell, Corson, Dewey, Haakon, Harding and 13 more | 93 min |
| Jul 8, 9:58 PM CDT | Severe Thunderstorm Watch | SPC | Aurora, Beadle, Brookings, Brown, Brule, Buffalo and 39 more | 7 hr |
| Jul 8, 11:27 PM CDT | Mesoscale Discussion | SPC | Aurora, Beadle, Brookings, Brown, Brule, Buffalo and 39 more | 93 min |
Nearby
Mesoscale Discussions in Minnesota, 2009Mesoscale Discussions in Nebraska, 2009Mesoscale Discussions in South Dakota, 2009Every mesoscale discussion in 2009
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.