Alert archive / Illinois / Tornado Watches in 2024
Tornado Watch 25
The Storm Prediction Center issued this tornado watch at Feb 27, 2024, 3:53 PM CST for 26 counties in Illinois; 5 counties in Indiana. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Feb 27, 2024, 3:53 PM CST (21:53 UTC)
- Expired
- Feb 27, 2024, 10:00 PM CST
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 3 in
- Strongest gust expected
- 60 kt
All 31 counties
Boone County, IL, Bureau County, IL, Cook County, IL, DeKalb County, IL, DuPage County, IL, Ford County, IL, Grundy County, IL, Henry 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, Marshall County, IL, McHenry County, IL, Mercer County, IL, Ogle County, IL, Putnam County, IL, Rock Island County, IL, Stark County, IL, Whiteside County, IL, Will County, IL, Winnebago County, IL, Benton County, IN, Jasper County, IN, Lake County, IN, Newton County, IN, Porter County, IN
The radar
The Chicago radar (KLOT), 72 km from the middle of the area, began a volume at 21:56 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
- 60%
- One or more EF2 to EF5 tornadoes
- 40%
- Ten or more severe wind reports
- 40%
- One or more gusts of 65 knots or more
- 20%
- Ten or more severe hail reports
- 80%
- One or more hailstones of 2 inches or more
- 60%
- Six or more combined severe hail and wind reports
- 95%
Warnings issued inside it
26 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 27, 4:32 PM CST | Severe Thunderstorm Warning | DVN | Bureau, Henry, Whiteside | 43 min |
| Feb 27, 4:55 PM CST | Severe Thunderstorm Warning | DVN | Henry, Rock Island, Whiteside | 50 min |
| Feb 27, 4:56 PM CST | Severe Thunderstorm Warning | DVN | Mercer | 49 min |
| Feb 27, 5:12 PM CST | Severe Thunderstorm Warning | LOT | Lee, Ogle | 93 min |
| Feb 27, 5:13 PM CST | Severe Thunderstorm Warning | DVN | Whiteside | 47 min |
| Feb 27, 5:28 PM CST | Tornado Warning | DVN | Henry | 47 min |
| Feb 27, 5:43 PM CST | Tornado Warning | DVN | Henry, Mercer | 18 min |
| Feb 27, 5:44 PM CST | Severe Thunderstorm Warning | LOT | DeKalb, Kane | 91 min |
| Feb 27, 5:54 PM CST | Tornado Warning | LOT | LaSalle, Lee | 51 min |
| Feb 27, 6:02 PM CST | Tornado Warning | DVN | Bureau, Henry | 37 min |
| Feb 27, 6:22 PM CST | Tornado Warning | LOT | DeKalb | 39 min |
| Feb 27, 6:27 PM CST | Tornado Warning | LOT | DeKalb | 32 min |
| Feb 27, 6:45 PM CST | Severe Thunderstorm Warning | LOT | Kendall, LaSalle | 45 min |
| Feb 27, 6:45 PM CST | Tornado Warning | LOT | Kane | 27 min |
| Feb 27, 6:52 PM CST | Tornado Warning | LOT | Kane | 38 min |
| Feb 27, 6:54 PM CST | Tornado Warning | LOT | Kane, Kendall | 21 min |
| Feb 27, 7:07 PM CST | Severe Thunderstorm Warning | LOT | Cook, DuPage, Kane, Kendall, Lake, McHenry and 1 more | 68 min |
| Feb 27, 7:11 PM CST | Tornado Warning | LOT | Kane | 19 min |
| Feb 27, 7:17 PM CST | Severe Thunderstorm Warning | LOT | Winnebago | 43 min |
| Feb 27, 7:17 PM CST | Tornado Warning | LOT | Cook, Lake, McHenry | 28 min |
| Feb 27, 7:19 PM CST | Tornado Warning | LOT | Cook, DuPage | 26 min |
| Feb 27, 7:29 PM CST | Severe Thunderstorm Warning | LOT | Winnebago | 46 min |
| Feb 27, 7:32 PM CST | Tornado Warning | LOT | Cook, DuPage, Lake | 38 min |
| Feb 27, 8:14 PM CST | Severe Thunderstorm Warning | LOT | Cook | 46 min |
| Feb 27, 8:58 PM CST | Severe Thunderstorm Warning | LOT | Lake | 26 min |
| Feb 27, 9:02 PM CST | Tornado Warning | LOT | Cook | 28 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, 9.9 hours before the alert went out and 131 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
- 2996 m above ground
- 0-6 km bulk shear
- 47 kt
- 0-1 km storm-relative helicity
- 149 m²/s²
- 0-3 km storm-relative helicity
- 197 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 |
|---|---|---|---|---|
| Feb 27, 12:00 AM CST | Mesoscale Discussion | SPC | Franklin, Gallatin, Hamilton, Hardin, Jackson, Jefferson and 10 more | 2 hr |
| Feb 27, 2:50 PM CST | Mesoscale Discussion | SPC | Boone, Bureau, Cook, DeKalb, DuPage, Ford and 25 more | 115 min |
| Feb 27, 5:47 PM CST | Mesoscale Discussion | SPC | Bond, Christian, Clark, Clay, Clinton, Coles and 20 more | 88 min |
| Feb 27, 5:59 PM CST | Mesoscale Discussion | SPC | Boone, Bureau, Carroll, Cook, DeKalb, DuPage and 17 more | 91 min |
Nearby
Tornado Watches in Illinois, 2024Tornado Watches in Indiana, 2024Every tornado watch in 2024
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.