Alert archive / Iowa / Mesoscale Discussions in 2015
Mesoscale Discussion 1539
The Storm Prediction Center issued this mesoscale discussion at Jul 25, 2015, 10:54 PM CDT for 4 states. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 25, 2015, 10:54 PM CDT (03:54 UTC)
- Expired
- Jul 26, 2015, 1:00 AM CDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
All 33 counties
Buena Vista County, IA, Cherokee County, IA, Clay County, IA, Dickinson County, IA, Emmet County, IA, Humboldt County, IA, Kossuth County, IA, Lyon County, IA, O'Brien County, IA, Osceola County, IA, Palo Alto County, IA, Plymouth County, IA, Pocahontas County, IA, Sioux County, IA, Cottonwood County, MN, Jackson County, MN, Martin County, MN, Murray County, MN, Nobles County, MN, Pipestone County, MN, Rock County, MN, Cedar County, NE, Bon Homme County, SD, Charles Mix County, SD, Clay County, SD, Douglas County, SD, Hutchinson County, SD, Lincoln County, SD, McCook County, SD, Minnehaha County, SD, Turner County, SD, Union County, SD, Yankton County, SD
The radar
The Sioux Falls radar (KFSD), 65 km from the middle of the area, began a volume at 03:56 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 nearest sounding before it
Omaha, NE (KOAX), launched 00:00Z, 3.9 hours before the alert went out and 215 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
- 698 J/kg
- Mixed-layer CIN
- -124 J/kg
- Mixed-layer LCL
- 1049 m above ground
- 0-6 km bulk shear
- 41 kt
- 0-1 km storm-relative helicity
- 87 m²/s²
- 0-3 km storm-relative helicity
- 98 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 3.1
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 25, 9:32 PM CDT | Severe Thunderstorm Watch | SPC | Dickinson, Lyon, Osceola | 3 hr |
| Jul 26, 1:13 AM CDT | Mesoscale Discussion | SPC | Benton, Black Hawk, Boone, Bremer, Buena Vista, Butler and 40 more | 3 hr |
| Jul 26, 1:30 PM CDT | Mesoscale Discussion | SPC | Arthur, Chase, Cheyenne, Deuel, Garden, Grant and 4 more | 2 hr |
| Jul 26, 2:07 PM CDT | Severe Thunderstorm Watch | SPC | Arthur, Banner, Box Butte, Chase, Cherry, Cheyenne and 21 more | 9 hr |
| Jul 26, 5:22 PM CDT | Mesoscale Discussion | SPC | Arthur, Blaine, Box Butte, Brown, Chase, Cherry and 20 more | 83 min |
| Jul 26, 2:07 PM CDT | Mesoscale Discussion | SPC | Jackson, Meade, Oglala Lakota, Pennington | 83 min |
Nearby
Mesoscale Discussions in Iowa, 2015Mesoscale Discussions in South Dakota, 2015Mesoscale Discussions in Minnesota, 2015Every mesoscale discussion in 2015
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.