Alert archive / Iowa / Severe Thunderstorm Watches in 2006
Severe Thunderstorm Watch 201
The Storm Prediction Center issued this severe thunderstorm watch at Apr 18, 2006, 8:03 PM CDT for 41 counties in Iowa. It was in force for 4 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 18, 2006, 8:03 PM CDT (01:03 UTC)
- Expired
- Apr 19, 2006, 12:07 AM CDT
- In force
- 4 hr
- Issued by
- the Storm Prediction Center
All 41 counties
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, Decatur County, IA, Delaware County, IA, Des Moines County, IA, Grundy County, IA, Hamilton 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, Lee County, IA, Linn County, IA, Louisa County, IA, Lucas County, IA, Madison County, IA, Mahaska County, IA, Marion County, IA, Marshall County, IA, Monroe County, IA, Muscatine County, IA, Polk County, IA, Poweshiek County, IA, Story County, IA, Tama County, IA, Van Buren County, IA, Wapello County, IA, Warren County, IA, Washington County, IA, Wayne County, IA
The radar
The Des Moines radar (KDMX), 68 km from the middle of the area, began a volume at 01:04 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.
Warnings issued inside it
13 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 18, 8:03 PM CDT | Severe Thunderstorm Warning | DMX | Clarke | 42 min |
| Apr 18, 8:28 PM CDT | Severe Thunderstorm Warning | DMX | Decatur, Wayne | 47 min |
| Apr 18, 8:43 PM CDT | Severe Thunderstorm Warning | DMX | Clarke | 47 min |
| Apr 18, 8:46 PM CDT | Severe Thunderstorm Warning | DMX | Lucas | 44 min |
| Apr 18, 8:51 PM CDT | Severe Thunderstorm Warning | DMX | Madison | 39 min |
| Apr 18, 9:02 PM CDT | Severe Thunderstorm Warning | DMX | Warren | 43 min |
| Apr 18, 9:12 PM CDT | Severe Thunderstorm Warning | DMX | Polk | 48 min |
| Apr 18, 9:14 PM CDT | Severe Thunderstorm Warning | DMX | Wayne | 46 min |
| Apr 18, 9:20 PM CDT | Severe Thunderstorm Warning | DMX | Marion | 55 min |
| Apr 18, 9:27 PM CDT | Severe Thunderstorm Warning | DMX | Appanoose | 37 min |
| Apr 18, 9:38 PM CDT | Severe Thunderstorm Warning | DMX | Jasper | 52 min |
| Apr 18, 9:50 PM CDT | Severe Thunderstorm Warning | DMX | Lucas, Monroe | 40 min |
| Apr 18, 9:56 PM CDT | Severe Thunderstorm Warning | DMX | Marshall | 49 min |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
Davenport, (KDVN), launched 00:00Z, 1.1 hours before the alert went out and 201 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 2053 m above ground
- 0-6 km bulk shear
- 41 kt
- 0-1 km storm-relative helicity
- 54 m²/s²
- 0-3 km storm-relative helicity
- 235 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 18, 10:36 PM CDT | Mesoscale Discussion | SPC | Appanoose, Benton, Black Hawk, Buchanan, Cedar, Clinton and 27 more | 114 min |
Nearby
Severe Thunderstorm Watches in Iowa, 2006Every severe thunderstorm watch in 2006
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.