Alert archive / Illinois / Tornado Watches in 2020
Tornado Watch 374
The Storm Prediction Center issued this tornado watch at Jul 15, 2020, 3:14 PM CDT for 5 counties in Illinois. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 15, 2020, 3:14 PM CDT (20:14 UTC)
- Expired
- Jul 15, 2020, 9:00 PM CDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 60 kt
Counties Ford County, IL, Grundy County, IL, Iroquois County, IL, Kankakee County, IL, Livingston County, IL
The radar
The Chicago radar (KLOT), 53 km from the middle of the area, began a volume at 20:13 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
- 30%
- One or more EF2 to EF5 tornadoes
- 5%
- Ten or more severe wind reports
- 20%
- One or more gusts of 65 knots or more
- 5%
- Ten or more severe hail reports
- 30%
- One or more hailstones of 2 inches or more
- 5%
- Six or more combined severe hail and wind reports
- 60%
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 |
|---|---|---|---|---|
| Jul 15, 3:28 PM CDT | Severe Thunderstorm Warning | LOT | Livingston | 62 min |
| Jul 15, 4:10 PM CDT | Tornado Warning | LOT | Livingston | 35 min |
| Jul 15, 4:27 PM CDT | Tornado Warning | LOT | Livingston | 63 min |
| Jul 15, 5:11 PM CDT | Tornado Warning | LOT | Ford, Iroquois | 45 min |
| Jul 15, 7:19 PM CDT | Flash Flood Warning | LOT | Livingston | 3 hr |
| Jul 15, 8:04 PM CDT | Severe Thunderstorm Warning | LOT | Ford | 29 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
Lincoln, IL (KILX), launched 12:00Z, 8.2 hours before the alert went out and 119 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
- 1529 m above ground
- 0-6 km bulk shear
- 20 kt
- 0-1 km storm-relative helicity
- 30 m²/s²
- 0-3 km storm-relative helicity
- 32 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 |
|---|---|---|---|---|
| Jul 15, 1:10 PM CDT | Mesoscale Discussion | SPC | Bond, Calhoun, Cass, Christian, Clinton, Fayette and 17 more | 2 hr |
| Jul 15, 2:10 PM CDT | Tornado Watch | SPC | Bond, Brown, Calhoun, Cass, Christian, Clinton and 30 more | 7 hr |
| Jul 15, 2:13 PM CDT | Mesoscale Discussion | SPC | Brown, Fulton, Livingston, McDonough, McLean, Marshall and 5 more | 62 min |
| Jul 15, 5:35 PM CDT | Mesoscale Discussion | SPC | Bond, Champaign, Christian, Clark, Clay, Clinton and 35 more | 85 min |
| Jul 15, 6:12 PM CDT | Tornado Watch | SPC | Champaign, Clark, Clay, Coles, Crawford, Cumberland and 20 more | 5 hr |
Nearby
Tornado Watches in Illinois, 2020Every tornado watch in 2020
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.