Alert archive / Iowa / Severe Thunderstorm Watches in 2008
Severe Thunderstorm Watch 484
The Storm Prediction Center issued this severe thunderstorm watch at Jun 8, 2008, 3:05 AM CDT for Rock Island County, Illinois; 56 counties in Iowa. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Jun 8, 2008, 3:05 AM CDT (08:05 UTC)
- Expired
- Jun 8, 2008, 9:00 AM CDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 60 kt
All 57 counties
Adair County, IA, Adams County, IA, Appanoose County, IA, Audubon County, IA, Benton County, IA, Black Hawk County, IA, Boone County, IA, Buchanan County, IA, Carroll County, IA, Cass County, IA, Cedar County, IA, Clarke County, IA, Clinton County, IA, Crawford County, IA, Dallas County, IA, Davis County, IA, Decatur County, IA, Delaware County, IA, Des Moines County, IA, Dubuque County, IA, Greene County, IA, Grundy County, IA, Guthrie County, IA, Hamilton County, IA, Hardin County, IA, Henry County, IA, Iowa County, IA, Jackson 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, Ringgold County, IA, Scott County, IA, Story County, IA, Tama County, IA, Taylor County, IA, Union County, IA, Van Buren County, IA, Wapello County, IA, Warren County, IA, Washington County, IA, Wayne County, IA, Rock Island County, IL
The radar
The Des Moines radar (KDMX), 39 km from the middle of the area, began a volume at 08:06 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.
What SPC expected
The probabilities SPC published with the watch, for the watch area over its life.
- Two or more tornadoes
- 20%
- One or more EF2 to EF5 tornadoes
- 5%
- Ten or more severe wind reports
- 50%
- One or more gusts of 65 knots or more
- 30%
- Ten or more severe hail reports
- 30%
- One or more hailstones of 2 inches or more
- 20%
- Six or more combined severe hail and wind reports
- 80%
Warnings issued inside it
9 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 8, 3:18 AM CDT | Severe Thunderstorm Warning | DMX | Carroll, Crawford | 42 min |
| Jun 8, 3:30 AM CDT | Flash Flood Warning | DMX | Franklin, Hamilton, Hardin | 6 hr |
| Jun 8, 3:37 AM CDT | Severe Thunderstorm Warning | DMX | Adair, Adams, Cass | 53 min |
| Jun 8, 6:06 AM CDT | Severe Thunderstorm Warning | DMX | Jasper, Polk, Story | 24 min |
| Jun 8, 6:26 AM CDT | Severe Thunderstorm Warning | DMX | Madison, Warren | 21 min |
| Jun 8, 7:14 AM CDT | Severe Thunderstorm Warning | DMX | Jasper, Marshall, Tama | 46 min |
| Jun 8, 7:27 AM CDT | Flash Flood Warning | DMX | Boone, Dallas, Polk, Story | 6 hr |
| Jun 8, 7:31 AM CDT | Flash Flood Warning | DMX | Jasper, Marshall | 6 hr |
| Jun 8, 8:25 AM CDT | Flash Flood Warning | DVN | Benton, Buchanan, Delaware, Dubuque, Jackson, Jones and 1 more | 8 hr |
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, 8.1 hours before the alert went out and 229 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
- 2793 J/kg
- Mixed-layer CIN
- -2 J/kg
- Mixed-layer LCL
- 1056 m above ground
- 0-6 km bulk shear
- 33 kt
- 0-1 km storm-relative helicity
- 164 m²/s²
- 0-3 km storm-relative helicity
- 221 m²/s²
- Significant tornado parameter
- 2.3
- Supercell composite
- 16.3
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 7, 7:40 PM CDT | Tornado Watch | SPC | Boone, Carroll, Jo Daviess, McHenry, Stephenson, Winnebago | 7 hr |
| Jun 8, 6:39 AM CDT | Mesoscale Discussion | SPC | Mercer, Rock Island | 66 min |
| Jun 8, 8:43 AM CDT | Mesoscale Discussion | SPC | Boone, Carroll, Cook, DeKalb, DuPage, Kane and 9 more | 62 min |
| Jun 8, 9:47 AM CDT | Severe Thunderstorm Watch | SPC | Boone, Bureau, Carroll, Cook, DeKalb, DuPage and 17 more | 5 hr |
| Jun 8, 2:04 PM CDT | Mesoscale Discussion | SPC | Grundy, Kankakee, Kendall, LaSalle, Will | 116 min |
| Jun 8, 4:32 PM CDT | Mesoscale Discussion | SPC | Mercer, Rock Island | 28 min |
| Jun 8, 4:43 PM CDT | Tornado Watch | SPC | Carroll, Henderson, Henry, Jo Daviess, Mercer, Rock Island and 3 more | 6 hr |
| Jun 8, 5:36 PM CDT | Severe Thunderstorm Watch | SPC | Adams, Hancock, McDonough | 6 hr |
| Jun 7, 10:15 PM CDT | Mesoscale Discussion | SPC | Buena Vista, Cherokee, Clay, Crawford, Dickinson, Emmet and 12 more | 90 min |
| Jun 7, 11:01 PM CDT | Mesoscale Discussion | SPC | Monona, Woodbury | 59 min |
| Jun 7, 11:11 PM CDT | Severe Thunderstorm Watch | SPC | Buena Vista, Cherokee, Clay, Harrison, Ida, Mills and 8 more | 7 hr |
| Jun 8, 2:29 AM CDT | Mesoscale Discussion | SPC | Adair, Adams, Allamakee, Audubon, Benton, Black Hawk and 58 more | 31 min |
| Jun 8, 12:28 PM CDT | Mesoscale Discussion | SPC | Adair, Adams, Appanoose, Audubon, Cass, Clarke and 26 more | 2 hr |
| Jun 8, 1:21 PM CDT | Tornado Watch | SPC | Adair, Adams, Audubon, Boone, Carroll, Cass and 21 more | 7 hr |
| Jun 8, 1:34 PM CDT | Severe Thunderstorm Watch | SPC | Fremont, Montgomery, Page | 7 hr |
| Jun 8, 3:47 PM CDT | Mesoscale Discussion | SPC | Adair, Adams, Boone, Clarke, Dallas, Decatur and 18 more | 118 min |
Nearby
Severe Thunderstorm Watches in Iowa, 2008Severe Thunderstorm Watches in Illinois, 2008Every severe thunderstorm watch in 2008
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.