Alert archive / Indiana / Severe Thunderstorm Watches in 2014
Severe Thunderstorm Watch 476
The Storm Prediction Center issued this severe thunderstorm watch at Aug 25, 2014, 3:34 PM CDT for 21 counties in Illinois; 32 counties in Indiana. It was in force for 4 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 25, 2014, 3:34 PM CDT (20:34 UTC)
- Expired
- Aug 25, 2014, 8:00 PM CDT
- In force
- 4 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1 in
- Strongest gust expected
- 60 kt
All 53 counties
Bureau County, IL, Champaign County, IL, DeKalb County, IL, Ford County, IL, Grundy County, IL, Henry County, IL, Iroquois County, IL, Kane County, IL, Kankakee County, IL, Kendall County, IL, LaSalle County, IL, Lee County, IL, Livingston County, IL, Marshall County, IL, McLean County, IL, Putnam County, IL, Stark County, IL, Vermilion County, IL, Whiteside County, IL, Will County, IL, Woodford County, IL, Benton County, IN, Boone County, IN, Carroll County, IN, Cass County, IN, Clinton County, IN, Fountain County, IN, Fulton County, IN, Grant County, IN, Hamilton County, IN, Hancock County, IN, Hendricks County, IN, Howard County, IN, Huntington County, IN, Jasper County, IN, Kosciusko County, IN, Madison County, IN, Marion County, IN, Marshall County, IN, Miami County, IN, Montgomery County, IN, Newton County, IN, Parke County, IN, Pulaski County, IN, Putnam County, IN, Starke County, IN, Tippecanoe County, IN, Tipton County, IN, Vermillion County, IN, Wabash County, IN, Warren County, IN, White County, IN, Whitley County, IN
The radar
The Chicago radar (KLOT), 86 km from the middle of the area, began a volume at 20:38 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
- 10%
- 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
- 20%
- One or more hailstones of 2 inches or more
- 10%
- Six or more combined severe hail and wind reports
- 60%
Warnings issued inside it
4 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 25, 3:42 PM CDT | Severe Thunderstorm Warning | LOT | DeKalb, Kane, Kendall, LaSalle, Lee | 48 min |
| Aug 25, 5:09 PM CDT | Severe Thunderstorm Warning | IND | Carroll, Clinton, Montgomery, Tippecanoe | 51 min |
| Aug 25, 5:17 PM CDT | Severe Thunderstorm Warning | LOT | Livingston | 43 min |
| Aug 25, 5:35 PM CDT | Severe Thunderstorm Warning | LOT | Livingston | 62 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, 8.6 hours before the alert went out and 92 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
- 2485 J/kg
- Mixed-layer CIN
- -95 J/kg
- Mixed-layer LCL
- 1067 m above ground
- 0-6 km bulk shear
- 18 kt
- 0-1 km storm-relative helicity
- 67 m²/s²
- 0-3 km storm-relative helicity
- 70 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 |
|---|---|---|---|---|
| Aug 25, 1:10 PM CDT | Mesoscale Discussion | SPC | Cook, Ford, Grundy, Iroquois, Kankakee, Livingston and 1 more | 2 hr |
| Aug 25, 5:30 PM CDT | Mesoscale Discussion | SPC | DeKalb, DuPage, Ford, Grundy, Iroquois, Kane and 9 more | 60 min |
Nearby
Severe Thunderstorm Watches in Indiana, 2014Severe Thunderstorm Watches in Illinois, 2014Every severe thunderstorm watch in 2014
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.