Alert archive / Illinois / Severe Thunderstorm Watches in 2006
Severe Thunderstorm Watch 556
The Storm Prediction Center issued this severe thunderstorm watch at Jun 25, 2006, 3:39 PM CDT for 24 counties in Illinois; 11 counties in Iowa; 7 counties in Wisconsin. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Jun 25, 2006, 3:39 PM CDT (20:39 UTC)
- Expired
- Jun 25, 2006, 9:00 PM CDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 60 kt
All 42 counties
Cedar County, IA, Clinton County, IA, Des Moines County, IA, Dubuque County, IA, Henry County, IA, Jackson County, IA, Jones County, IA, Lee County, IA, Louisa County, IA, Muscatine County, IA, Scott County, IA, Bureau County, IL, Carroll County, IL, Fulton County, IL, Hancock County, IL, Henderson County, IL, Henry County, IL, Jo Daviess County, IL, Knox County, IL, Lee County, IL, Marshall County, IL, Mason County, IL, McDonough County, IL, Mercer County, IL, Ogle County, IL, Peoria County, IL, Putnam County, IL, Rock Island County, IL, Stark County, IL, Stephenson County, IL, Tazewell County, IL, Warren County, IL, Whiteside County, IL, Winnebago County, IL, Woodford County, IL, Columbia County, WI, Dane County, WI, Green County, WI, Iowa County, WI, Lafayette County, WI, Rock County, WI, Sauk County, WI
The radar
The Quad Cities radar (KDVN), 5 km from the middle of the area, began a volume at 20:40 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
- 2%
- Ten or more severe wind reports
- 20%
- One or more gusts of 65 knots or more
- 5%
- Ten or more severe hail reports
- 40%
- One or more hailstones of 2 inches or more
- 5%
- Six or more combined severe hail and wind reports
- 70%
Warnings issued inside it
6 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 25, 3:53 PM CDT | Flash Flood Warning | MKX | Columbia, Sauk | 2 hr |
| Jun 25, 3:57 PM CDT | Severe Thunderstorm Warning | MKX | Columbia | 63 min |
| Jun 25, 3:58 PM CDT | Severe Thunderstorm Warning | DVN | Cedar, Johnson | 62 min |
| Jun 25, 5:13 PM CDT | Severe Thunderstorm Warning | DVN | Warren | 40 min |
| Jun 25, 5:39 PM CDT | Flash Flood Warning | MKX | Dane | 2 hr |
| Jun 25, 6:28 PM CDT | Severe Thunderstorm Warning | DVN | Henry | 47 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 12:00Z, 8.7 hours before the alert went out and 8 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
- 320 J/kg
- Mixed-layer CIN
- -70 J/kg
- Mixed-layer LCL
- 818 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- 11 m²/s²
- 0-3 km storm-relative helicity
- 26 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 25, 12:38 PM CDT | Mesoscale Discussion | SPC | Hancock, Henderson, Henry, Jo Daviess, Knox, McDonough and 4 more | 97 min |
| Jun 25, 2:00 PM CDT | Mesoscale Discussion | SPC | Boone, Ogle, Stephenson, Winnebago | 90 min |
| Jun 24, 7:45 PM CDT | Mesoscale Discussion | SPC | Allamakee, Clayton, Fayette, Winneshiek | 90 min |
| Jun 25, 12:55 PM CDT | Mesoscale Discussion | SPC | Barry, Barton, Cedar, Christian, Dade, Dallas and 15 more | 2 hr |
Nearby
Severe Thunderstorm Watches in Illinois, 2006Severe Thunderstorm Watches in Iowa, 2006Severe Thunderstorm Watches in Wisconsin, 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.