Alert archive / Indiana / Severe Thunderstorm Watches in 2017
Severe Thunderstorm Watch 207
The Storm Prediction Center issued this severe thunderstorm watch at May 10, 2017, 7:07 PM CDT for 12 counties in Illinois; 36 counties in Indiana. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- May 10, 2017, 7:07 PM CDT (00:07 UTC)
- Expired
- May 11, 2017, 12:00 AM CDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
All 48 counties
Champaign County, IL, Christian County, IL, Clark County, IL, Coles County, IL, Cumberland County, IL, Douglas County, IL, Edgar County, IL, Macon County, IL, Moultrie County, IL, Piatt County, IL, Shelby County, IL, Vermilion County, IL, Bartholomew County, IN, Boone County, IN, Brown County, IN, Carroll County, IN, Clay County, IN, Clinton County, IN, Decatur County, IN, Delaware County, IN, Fountain County, IN, Greene County, IN, Hamilton County, IN, Hancock County, IN, Hendricks County, IN, Henry County, IN, Howard County, IN, Jackson County, IN, Jennings County, IN, Johnson County, IN, Lawrence County, IN, Madison County, IN, Marion County, IN, Monroe County, IN, Montgomery County, IN, Morgan County, IN, Owen County, IN, Parke County, IN, Putnam County, IN, Randolph County, IN, Rush County, IN, Shelby County, IN, Sullivan County, IN, Tippecanoe County, IN, Tipton County, IN, Vermillion County, IN, Vigo County, IN, Warren County, IN
The radar
The Indianapolis radar (KIND), 108 km from the middle of the area, began a volume at 00:08 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
- 50%
- One or more gusts of 65 knots or more
- 10%
- Ten or more severe hail reports
- 30%
- One or more hailstones of 2 inches or more
- 30%
- Six or more combined severe hail and wind reports
- 70%
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 |
|---|---|---|---|---|
| May 10, 7:43 PM CDT | Tornado Warning | ILX | Macon, Piatt | 32 min |
| May 10, 8:31 PM CDT | Severe Thunderstorm Warning | ILX | Champaign, Douglas | 17 min |
| May 10, 9:14 PM CDT | Severe Thunderstorm Warning | IND | Clay, Parke, Sullivan, Vermillion, Vigo | 46 min |
| May 10, 9:46 PM CDT | Severe Thunderstorm Warning | IND | Clay, Greene, Hendricks, Monroe, Morgan, Owen and 2 more | 44 min |
| May 10, 10:23 PM CDT | Severe Thunderstorm Warning | IND | Bartholomew, Brown, Hendricks, Jackson, Johnson, Marion and 3 more | 52 min |
| May 10, 11:03 PM CDT | Severe Thunderstorm Warning | IND | Decatur, Jennings, Rush | 25 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 00:00Z, 0.1 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
- 442 J/kg
- Mixed-layer CIN
- -26 J/kg
- Mixed-layer LCL
- 1634 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 104 m²/s²
- 0-3 km storm-relative helicity
- 140 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 3.0
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 10, 9:42 PM CDT | Mesoscale Discussion | SPC | Clark, Crawford, Cumberland, Effingham, Jasper | 63 min |
| May 11, 12:58 PM CDT | Mesoscale Discussion | SPC | Gallatin, Hamilton, Hardin, Johnson, Massac, Pope and 4 more | 3 hr |
Nearby
Severe Thunderstorm Watches in Indiana, 2017Severe Thunderstorm Watches in Illinois, 2017Every severe thunderstorm watch in 2017
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.