Alert archive / Illinois / Severe Thunderstorm Watches in 2015
Severe Thunderstorm Watch 536
The Storm Prediction Center issued this severe thunderstorm watch at Nov 11, 2015, 6:16 PM CST for 18 counties in Illinois; 9 counties in Wisconsin. It was in force for 4 hr.
The area
The outline as issued.
The facts
- Issued
- Nov 11, 2015, 6:16 PM CST (00:16 UTC)
- Expired
- Nov 11, 2015, 10:17 PM CST
- In force
- 4 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 0.5 in
- Strongest gust expected
- 60 kt
All 27 counties
Boone County, IL, Cook County, IL, DeKalb County, IL, DuPage County, IL, Ford County, IL, Grundy County, IL, Iroquois County, IL, Kane County, IL, Kankakee County, IL, Kendall County, IL, Lake County, IL, LaSalle County, IL, Lee County, IL, Livingston County, IL, McHenry County, IL, Ogle County, IL, Will County, IL, Winnebago County, IL, Dane County, WI, Green County, WI, Iowa County, WI, Jefferson County, WI, Kenosha County, WI, Lafayette County, WI, Racine County, WI, Rock County, WI, Walworth County, WI
The radar
The Quad Cities radar (KDVN), 106 km from the middle of the area, began a volume at 00:16 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
- 30%
- One or more gusts of 65 knots or more
- 10%
- Ten or more severe hail reports
- 5%
- One or more hailstones of 2 inches or more
- 5%
- Six or more combined severe hail and wind reports
- 60%
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 |
|---|---|---|---|---|
| Nov 11, 6:29 PM CST | Severe Thunderstorm Warning | MKX | Lafayette | 46 min |
| Nov 11, 6:44 PM CST | Severe Thunderstorm Warning | MKX | Iowa, Lafayette | 46 min |
| Nov 11, 7:05 PM CST | Severe Thunderstorm Warning | LOT | Lee, Ogle, Winnebago | 55 min |
| Nov 11, 7:05 PM CST | Severe Thunderstorm Warning | MKX | Green | 40 min |
| Nov 11, 7:31 PM CST | Severe Thunderstorm Warning | LOT | DeKalb, LaSalle, Lee, Ogle | 59 min |
| Nov 11, 7:36 PM CST | Severe Thunderstorm Warning | MKX | Green, Rock | 39 min |
| Nov 11, 7:56 PM CST | Severe Thunderstorm Warning | LOT | LaSalle, Livingston | 34 min |
| Nov 11, 8:10 PM CST | Severe Thunderstorm Warning | MKX | Rock, Walworth | 30 min |
| Nov 11, 8:30 PM CST | Severe Thunderstorm Warning | LOT | DeKalb, Grundy, Kane, Kendall, LaSalle, Livingston | 45 min |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Nov 11, 8:22 PM CST | Mesoscale Discussion | SPC | DeKalb, DuPage, Grundy, Kane, Kankakee, Kendall and 3 more | 53 min |
Nearby
Severe Thunderstorm Watches in Illinois, 2015Severe Thunderstorm Watches in Wisconsin, 2015Every severe thunderstorm watch in 2015
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; radar from the NEXRAD Level II archive.