Alert archive / Illinois / Tornado Watches in 2010
Tornado Watch 519
The Storm Prediction Center issued this tornado watch at Jul 22, 2010, 8:53 PM CDT for 13 counties in Illinois; 7 counties in Iowa; 7 counties in Wisconsin. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 22, 2010, 8:53 PM CDT (01:53 UTC)
- Expired
- Jul 23, 2010, 2:00 AM CDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
All 27 counties
Benton County, IA, Buchanan County, IA, Delaware County, IA, Dubuque County, IA, Jackson County, IA, Jones County, IA, Linn County, IA, Boone County, IL, Carroll County, IL, Cook County, IL, DeKalb County, IL, DuPage County, IL, Jo Daviess County, IL, Kane County, IL, Lake County, IL, Lee County, IL, McHenry County, IL, Ogle County, IL, Stephenson County, IL, Winnebago County, IL, Grant County, WI, Green County, WI, Kenosha County, WI, Lafayette County, WI, Racine County, WI, Rock County, WI, Walworth County, WI
The radar
The Quad Cities radar (KDVN), 98 km from the middle of the area, began a volume at 01:56 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
- 40%
- One or more EF2 to EF5 tornadoes
- 20%
- Ten or more severe wind reports
- 30%
- One or more gusts of 65 knots or more
- 30%
- Ten or more severe hail reports
- 40%
- One or more hailstones of 2 inches or more
- 30%
- Six or more combined severe hail and wind reports
- 70%
Warnings issued inside it
11 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 22, 9:04 PM CDT | Flash Flood Warning | ARX | Grant | 6 hr |
| Jul 22, 9:13 PM CDT | Severe Thunderstorm Warning | MKX | Kenosha, Racine, Walworth | 38 min |
| Jul 22, 9:21 PM CDT | Severe Thunderstorm Warning | LOT | Winnebago | 54 min |
| Jul 22, 9:25 PM CDT | Severe Thunderstorm Warning | MKX | Rock, Walworth | 50 min |
| Jul 22, 9:42 PM CDT | Flash Flood Warning | DVN | Dubuque | 8 hr |
| Jul 22, 9:48 PM CDT | Severe Thunderstorm Warning | LOT | Boone, McHenry, Winnebago | 57 min |
| Jul 22, 10:21 PM CDT | Tornado Warning | LOT | Lake, McHenry | 39 min |
| Jul 22, 10:37 PM CDT | Severe Thunderstorm Warning | MKX | Kenosha, Racine | 23 min |
| Jul 22, 10:52 PM CDT | Flash Flood Warning | DVN | Jo Daviess, Stephenson | 13 hr |
| Jul 22, 10:56 PM CDT | Tornado Warning | LOT | Lake | 34 min |
| Jul 22, 11:47 PM CDT | Severe Thunderstorm Warning | LOT | Boone, DeKalb, Ogle, Winnebago | 30 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, 1.9 hours before the alert went out and 97 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
- 2664 J/kg
- Mixed-layer CIN
- -13 J/kg
- Mixed-layer LCL
- 1076 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- 125 m²/s²
- 0-3 km storm-relative helicity
- 267 m²/s²
- Significant tornado parameter
- 1.5
- Supercell composite
- 9.9
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 22, 8:25 PM CDT | Mesoscale Discussion | SPC | Jo Daviess | 95 min |
| Jul 22, 11:00 PM CDT | Mesoscale Discussion | SPC | Boone, Carroll, Cook, DeKalb, DuPage, Jo Daviess and 6 more | 90 min |
| Jul 23, 1:23 AM CDT | Mesoscale Discussion | SPC | Boone, Jo Daviess, McHenry, Stephenson, Winnebago | 52 min |
| Jul 23, 2:30 PM CDT | Mesoscale Discussion | SPC | Boone, Bureau, Carroll, Cook, DeKalb, DuPage and 21 more | 90 min |
| Jul 23, 3:01 PM CDT | Severe Thunderstorm Watch | SPC | Boone, Bureau, Carroll, Cook, DeKalb, DuPage and 21 more | 5 hr |
| Jul 23, 3:26 AM CDT | Mesoscale Discussion | SPC | Boone, Calhoun, Carroll, Crawford, Greene, Grundy and 7 more | 94 min |
| Jul 23, 5:19 PM CDT | Mesoscale Discussion | SPC | Appanoose, Clarke, Davis, Decatur, Henry, Jefferson and 11 more | 86 min |
| Jul 23, 6:58 PM CDT | Mesoscale Discussion | SPC | Buena Vista, Cherokee, Clay, Dickinson, Lyon, O'Brien and 4 more | 92 min |
| Jul 22, 8:11 PM CDT | Mesoscale Discussion | SPC | Green, Jefferson, Kenosha, Lafayette, Milwaukee, Racine and 2 more | 64 min |
Nearby
Tornado Watches in Illinois, 2010Tornado Watches in Iowa, 2010Tornado Watches in Wisconsin, 2010Every tornado watch in 2010
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.