Alert archive / Iowa / Mesoscale Discussions in 2008
Mesoscale Discussion 797
The Storm Prediction Center issued this mesoscale discussion at May 6, 2008, 2:22 PM CDT for 11 counties in Iowa; Cedar County, Dakota County, Dixon County, Nebraska; 6 counties in South Dakota. It was in force for 113 min.
The area
The outline as issued.
The facts
- Issued
- May 6, 2008, 2:22 PM CDT (19:22 UTC)
- Expired
- May 6, 2008, 4:15 PM CDT
- In force
- 113 min
- Issued by
- the Storm Prediction Center
Counties Buena Vista County, IA, Cherokee County, IA, Clay County, IA, Dickinson County, IA, Ida County, IA, Lyon County, IA, O'Brien County, IA, Osceola County, IA, Plymouth County, IA, Sioux County, IA, Woodbury County, IA, Cedar County, NE, Dakota County, NE, Dixon County, NE, Clay County, SD, Hutchinson County, SD, Lincoln County, SD, Turner County, SD, Union County, SD, Yankton County, SD
The radar
The Sioux Falls radar (KFSD), 87 km from the middle of the area, began a volume at 19:23 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, 7.4 hours before the alert went out and 169 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
- 60 J/kg
- Mixed-layer CIN
- -206 J/kg
- Mixed-layer LCL
- 1232 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- -37 m²/s²
- 0-3 km storm-relative helicity
- -3 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.0
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 |
|---|---|---|---|---|
| May 6, 10:56 AM CDT | Mesoscale Discussion | SPC | Buena Vista, Cherokee, Clay, Dickinson, Ida, Lyon and 6 more | 94 min |
| May 6, 12:03 PM CDT | Severe Thunderstorm Watch | SPC | Buena Vista, Calhoun, Carroll, Cherokee, Clay, Crawford and 15 more | 7 hr |
| May 6, 2:50 PM CDT | Severe Thunderstorm Watch | SPC | Harrison, Monona, Pottawattamie, Shelby | 7 hr |
| May 6, 6:23 PM CDT | Mesoscale Discussion | SPC | Audubon, Cass, Crawford, Fremont, Harrison, Mills and 4 more | 2 hr |
| May 6, 1:58 PM CDT | Mesoscale Discussion | SPC | Arthur, Blaine, Boone, Brown, Chase, Cherry and 21 more | 92 min |
| May 6, 3:46 PM CDT | Severe Thunderstorm Watch | SPC | Dundy, Hitchcock, Red Willow | 6 hr |
Nearby
Mesoscale Discussions in Iowa, 2008Mesoscale Discussions in South Dakota, 2008Mesoscale Discussions in Nebraska, 2008Every mesoscale discussion in 2008
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.