Alert archive / Iowa / Mesoscale Discussions in 2007
Mesoscale Discussion 1827
The Storm Prediction Center issued this mesoscale discussion at Aug 20, 2007, 10:06 PM CDT for 49 counties in Iowa; 5 counties in Missouri. It was in force for 84 min.
The area
The outline as issued.
The facts
- Issued
- Aug 20, 2007, 10:06 PM CDT (03:06 UTC)
- Expired
- Aug 20, 2007, 11:30 PM CDT
- In force
- 84 min
- Issued by
- the Storm Prediction Center
All 54 counties
Adair County, IA, Adams County, IA, Appanoose County, IA, Boone County, IA, Buena Vista County, IA, Calhoun County, IA, Carroll County, IA, Clarke County, IA, Clay County, IA, Dallas County, IA, Davis County, IA, Decatur County, IA, Dickinson County, IA, Emmet County, IA, Franklin County, IA, Greene County, IA, Grundy County, IA, Guthrie County, IA, Hamilton County, IA, Hancock County, IA, Hardin County, IA, Humboldt County, IA, Jasper County, IA, Jefferson County, IA, Keokuk County, IA, Kossuth County, IA, Lucas County, IA, Madison County, IA, Mahaska County, IA, Marion County, IA, Marshall County, IA, Monroe County, IA, O'Brien County, IA, Palo Alto County, IA, Pocahontas County, IA, Polk County, IA, Poweshiek County, IA, Ringgold County, IA, Sac County, IA, Story County, IA, Tama County, IA, Taylor County, IA, Union County, IA, Van Buren County, IA, Wapello County, IA, Warren County, IA, Wayne County, IA, Webster County, IA, Wright County, IA, Mercer County, MO, Putnam County, MO, Schuyler County, MO, Scotland County, MO, Worth County, MO
The radar
The Des Moines radar (KDMX), 20 km from the middle of the area, began a volume at 03:06 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, 3.1 hours before the alert went out and 219 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
- 4337 J/kg
- Mixed-layer CIN
- -31 J/kg
- Mixed-layer LCL
- 1029 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 86 m²/s²
- 0-3 km storm-relative helicity
- 274 m²/s²
- Significant tornado parameter
- 3.9
- Supercell composite
- 21.2
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 |
|---|---|---|---|---|
| Aug 20, 7:03 PM CDT | Mesoscale Discussion | SPC | Adair, Adams, Audubon, Buena Vista, Calhoun, Carroll and 17 more | 117 min |
| Aug 20, 7:35 PM CDT | Mesoscale Discussion | SPC | Adair, Adams, Audubon, Calhoun, Carroll, Cass and 15 more | 85 min |
| Aug 20, 8:10 PM CDT | Severe Thunderstorm Watch | SPC | Adair, Adams, Appanoose, Audubon, Black Hawk, Boone and 50 more | 5 hr |
| Aug 21, 4:50 PM CDT | Mesoscale Discussion | SPC | Dickinson, Emmet, Howard, Mitchell, Osceola, Winnebago and 1 more | 85 min |
| Aug 21, 6:17 PM CDT | Mesoscale Discussion | SPC | Buena Vista, Cherokee, Clay, Crawford, Ida, Lyon and 6 more | 88 min |
| Aug 21, 6:47 PM CDT | Tornado Watch | SPC | Audubon, Black Hawk, Boone, Bremer, Buena Vista, Butler and 34 more | 7 hr |
Nearby
Mesoscale Discussions in Iowa, 2007Mesoscale Discussions in Missouri, 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.