Alert archive / Indiana / Severe Thunderstorm Watches in 2011
Severe Thunderstorm Watch 270
The Storm Prediction Center issued this severe thunderstorm watch at May 10, 2011, 3:31 PM EDT for 25 counties in Indiana; 4 counties in Ohio. It was in force for 4 hr.
The area
The outline as issued.
The facts
- Issued
- May 10, 2011, 3:31 PM EDT (19:31 UTC)
- Expired
- May 10, 2011, 8:00 PM EDT
- In force
- 4 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 3 in
- Strongest gust expected
- 60 kt
All 29 counties
Adams County, IN, Allen County, IN, Benton County, IN, Blackford County, IN, Cass County, IN, DeKalb County, IN, Fulton County, IN, Grant County, IN, Huntington County, IN, Jasper County, IN, Jay County, IN, Kosciusko County, IN, Lake County, IN, LaPorte County, IN, Marshall County, IN, Miami County, IN, Newton County, IN, Noble County, IN, Porter County, IN, Pulaski County, IN, Starke County, IN, Wabash County, IN, Wells County, IN, White County, IN, Whitley County, IN, Allen County, OH, Paulding County, OH, Putnam County, OH, Van Wert County, OH
The radar
The Northern Indiana radar (KIWX), 48 km from the middle of the area, began a volume at 19:32 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
- 20%
- 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
- 30%
- One or more hailstones of 2 inches or more
- 30%
- 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 |
|---|---|---|---|---|
| May 10, 3:56 PM EDT | Severe Thunderstorm Warning | IWX | Blackford, Jay | 41 min |
| May 10, 4:15 PM EDT | Severe Thunderstorm Warning | IWX | Adams, Wells | 45 min |
| May 10, 4:25 PM EDT | Severe Thunderstorm Warning | IWX | Allen | 65 min |
| May 10, 5:04 PM EDT | Severe Thunderstorm Warning | IWX | Adams | 32 min |
| May 10, 5:22 PM EDT | Severe Thunderstorm Warning | IWX | Van Wert | 53 min |
| May 10, 5:48 PM EDT | Severe Thunderstorm Warning | IWX | Allen, Paulding, Putnam, Van Wert | 57 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, 7.5 hours before the alert went out and 234 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
- 3483 J/kg
- Mixed-layer CIN
- -70 J/kg
- Mixed-layer LCL
- 717 m above ground
- 0-6 km bulk shear
- 37 kt
- 0-1 km storm-relative helicity
- 183 m²/s²
- 0-3 km storm-relative helicity
- 243 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 10.9
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 10, 11:21 AM EDT | Mesoscale Discussion | SPC | Bartholomew, Clark, Dearborn, Decatur, Fayette, Franklin and 13 more | 114 min |
| May 10, 1:10 PM EDT | Severe Thunderstorm Watch | SPC | Bartholomew, Boone, Brown, Carroll, Clark, Clay and 51 more | 7 hr |
| May 10, 4:32 PM EDT | Mesoscale Discussion | SPC | Adams, Blackford, Delaware, Grant, Huntington, Jay and 4 more | 88 min |
| May 10, 7:17 PM EDT | Mesoscale Discussion | SPC | Adams, Athens, Brown, Gallia, Highland, Hocking and 7 more | 28 min |
| May 10, 7:45 PM EDT | Severe Thunderstorm Watch | SPC | Gallia, Lawrence, Meigs | 5 hr |
Nearby
Severe Thunderstorm Watches in Indiana, 2011Severe Thunderstorm Watches in Ohio, 2011Every severe thunderstorm watch in 2011
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.