Alert archive / Iowa / Mesoscale Discussions in 2012
Mesoscale Discussion 1309
The Storm Prediction Center issued this mesoscale discussion at Jun 29, 2012, 2:43 PM CDT for 37 counties in Iowa. It was in force for 3 hr.
The area
The outline as issued.
The facts
- Issued
- Jun 29, 2012, 2:43 PM CDT (19:43 UTC)
- Expired
- Jun 29, 2012, 5:15 PM CDT
- In force
- 3 hr
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 40%
All 37 counties
Adair County, IA, Appanoose County, IA, Benton County, IA, Black Hawk County, IA, Boone County, IA, Buchanan County, IA, Cedar County, IA, Clarke County, IA, Dallas County, IA, Davis County, IA, Delaware County, IA, Grundy County, IA, Guthrie County, IA, Hardin County, IA, Henry County, IA, Iowa County, IA, Jasper County, IA, Jefferson County, IA, Johnson County, IA, Jones County, IA, Keokuk County, IA, Linn County, IA, Lucas County, IA, Madison County, IA, Mahaska County, IA, Marion County, IA, Marshall County, IA, Monroe County, IA, Polk County, IA, Poweshiek County, IA, Story County, IA, Tama County, IA, Union County, IA, Van Buren County, IA, Wapello County, IA, Warren County, IA, Washington County, IA
The radar
The Des Moines radar (KDMX), 74 km from the middle of the area, began a volume at 19:44 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
Davenport, (KDVN), launched 12:00Z, 7.7 hours before the alert went out and 194 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
- 2089 J/kg
- Mixed-layer CIN
- -252 J/kg
- Mixed-layer LCL
- 1383 m above ground
- 0-6 km bulk shear
- 36 kt
- 0-1 km storm-relative helicity
- 93 m²/s²
- 0-3 km storm-relative helicity
- 150 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 5.1
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 |
|---|---|---|---|---|
| Jun 29, 7:59 AM CDT | Mesoscale Discussion | SPC | Lyon, Plymouth, Sioux | 91 min |
| Jun 29, 3:49 PM CDT | Severe Thunderstorm Watch | SPC | Benton, Cedar, Clinton, Des Moines, Henry, Iowa and 19 more | 5 hr |
| Jun 29, 5:04 PM CDT | Mesoscale Discussion | SPC | Iowa, Johnson, Poweshiek | 26 min |
| Jun 29, 5:35 PM CDT | Mesoscale Discussion | SPC | Dickinson, Lyon, Osceola | 55 min |
Nearby
Mesoscale Discussions in Iowa, 2012Every mesoscale discussion in 2012
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.