Alert archive / Iowa / Mesoscale Discussions in 2007
Mesoscale Discussion 1535
The Storm Prediction Center issued this mesoscale discussion at Jul 19, 2007, 1:41 AM CDT for 29 counties in Iowa; 4 counties in Nebraska. It was in force for 94 min.
The area
The outline as issued.
The facts
- Issued
- Jul 19, 2007, 1:41 AM CDT (06:41 UTC)
- Expired
- Jul 19, 2007, 3:15 AM CDT
- In force
- 94 min
- Issued by
- the Storm Prediction Center
All 33 counties
Adair County, IA, Audubon County, IA, Black Hawk County, IA, Boone County, IA, Calhoun County, IA, Carroll County, IA, Cass County, IA, Crawford County, IA, Dallas County, IA, Greene County, IA, Grundy County, IA, Guthrie County, IA, Hamilton County, IA, Hardin County, IA, Harrison County, IA, Jasper County, IA, Madison County, IA, Mahaska County, IA, Marion County, IA, Marshall County, IA, Polk County, IA, Pottawattamie County, IA, Poweshiek County, IA, Sac County, IA, Shelby County, IA, Story County, IA, Tama County, IA, Warren County, IA, Webster County, IA, Douglas County, NE, Sarpy County, NE, Saunders County, NE, Washington County, NE
The radar
The Des Moines radar (KDMX), 77 km from the middle of the area, began a volume at 06:45 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, 6.7 hours before the alert went out and 155 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
- 2155 J/kg
- Mixed-layer CIN
- -38 J/kg
- Mixed-layer LCL
- 2120 m above ground
- 0-6 km bulk shear
- 27 kt
- 0-1 km storm-relative helicity
- 15 m²/s²
- 0-3 km storm-relative helicity
- 69 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 4.1
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 18, 8:39 PM CDT | Severe Thunderstorm Watch | SPC | Buena Vista, Cherokee, Ida, Monona, Plymouth, Woodbury | 7 hr |
| Jul 18, 9:06 PM CDT | Mesoscale Discussion | SPC | Clinton, Des Moines, Henry, Lee, Louisa, Scott | 84 min |
| Jul 18, 10:23 PM CDT | Mesoscale Discussion | SPC | Adair, Adams, Appanoose, Audubon, Benton, Black Hawk and 60 more | 97 min |
| Jul 18, 10:39 PM CDT | Severe Thunderstorm Watch | SPC | Adair, Audubon, Black Hawk, Boone, Calhoun, Carroll and 23 more | 5 hr |
| Jul 18, 11:07 PM CDT | Severe Thunderstorm Watch | SPC | Cedar, Clinton, Des Moines, Henry, Iowa, Jefferson and 8 more | 4 hr |
| Jul 18, 7:15 PM CDT | Mesoscale Discussion | SPC | Adams, Antelope, Arthur, Blaine, Boone, Box Butte and 45 more | 90 min |
Nearby
Mesoscale Discussions in Iowa, 2007Mesoscale Discussions in Nebraska, 2007Every mesoscale discussion in 2007
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.