Alert archive / Indiana / Severe Thunderstorm Watches in 2017
Severe Thunderstorm Watch 431
The Storm Prediction Center issued this severe thunderstorm watch at Jul 22, 2017, 2:08 AM EDT for 37 counties in Indiana. It was in force for 4 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 22, 2017, 2:08 AM EDT (06:08 UTC)
- Expired
- Jul 22, 2017, 6:18 AM EDT
- In force
- 4 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1 in
- Strongest gust expected
- 65 kt
All 37 counties
Adams County, IN, Blackford County, IN, Boone County, IN, Carroll County, IN, Cass County, IN, Clinton County, IN, Decatur County, IN, Delaware County, IN, Fayette County, IN, Fountain County, IN, Franklin County, IN, Fulton County, IN, Grant County, IN, Hamilton County, IN, Hancock County, IN, Hendricks County, IN, Henry County, IN, Howard County, IN, Huntington County, IN, Jay County, IN, Johnson County, IN, Madison County, IN, Marion County, IN, Miami County, IN, Montgomery County, IN, Pulaski County, IN, Randolph County, IN, Rush County, IN, Shelby County, IN, Tippecanoe County, IN, Tipton County, IN, Union County, IN, Wabash County, IN, Warren County, IN, Wayne County, IN, Wells County, IN, White County, IN
The radar
The Indianapolis radar (KIND), 61 km from the middle of the area, began a volume at 06:10 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
- 5%
- Ten or more severe wind reports
- 30%
- One or more gusts of 65 knots or more
- 30%
- Ten or more severe hail reports
- 10%
- One or more hailstones of 2 inches or more
- 5%
- Six or more combined severe hail and wind reports
- 50%
Warnings issued inside it
2 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 22, 2:45 AM EDT | Severe Thunderstorm Warning | IND | Boone, Carroll, Clinton, Fountain, Howard, Montgomery and 2 more | 60 min |
| Jul 22, 4:29 AM EDT | Severe Thunderstorm Warning | IND | Delaware, Henry, Randolph | 46 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, 6.1 hours before the alert went out and 198 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
- 2094 J/kg
- Mixed-layer CIN
- -2 J/kg
- Mixed-layer LCL
- 1572 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- 57 m²/s²
- 0-3 km storm-relative helicity
- 136 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 6.5
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 21, 9:35 PM EDT | Mesoscale Discussion | SPC | Cass, Fulton, Jasper, Lake, LaPorte, Marshall and 6 more | 115 min |
| Jul 22, 12:23 AM EDT | Mesoscale Discussion | SPC | Cass, Fulton, Jasper, Lake, LaPorte, Marshall and 6 more | 67 min |
| Jul 22, 1:53 AM EDT | Mesoscale Discussion | SPC | Boone, Carroll, Cass, Clinton, Delaware, Fayette and 14 more | 67 min |
| Jul 22, 5:00 AM EDT | Mesoscale Discussion | SPC | Fayette, Franklin, Randolph, Rush, Union, Wayne | 90 min |
Nearby
Severe Thunderstorm Watches in Indiana, 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.