Alert archive / Indiana / Severe Thunderstorm Watches in 2011

Severe Thunderstorm Watch 753

August 9, 201160 counties in Indiana; 40 counties in Ohio

The Storm Prediction Center issued this severe thunderstorm watch at Aug 9, 2011, 3:28 PM EDT for 60 counties in Indiana; 40 counties in Ohio. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued: Aug 9, 2011, 3:28 PM EDT (19:28 UTC)
Expired: Aug 9, 2011, 10:00 PM EDT
In force: 7 hr
Issued by: the Storm Prediction Center
Largest hail expected: 2 in
Strongest gust expected: 60 kt

All 100 counties

Adams County, IN, Allen County, IN, Bartholomew County, IN, Blackford County, IN, Boone County, IN, Brown County, IN, Carroll County, IN, Cass County, IN, Clay County, IN, Clinton County, IN, Dearborn County, IN, Decatur County, IN, DeKalb County, IN, Delaware County, IN, Fayette County, IN, Fountain County, IN, Franklin County, IN, Fulton County, IN, Grant County, IN, Greene County, IN, Hamilton County, IN, Hancock County, IN, Hendricks County, IN, Henry County, IN, Howard County, IN, Huntington County, IN, Jackson County, IN, Jay County, IN, Jennings County, IN, Johnson County, IN, Kosciusko County, IN, LaGrange County, IN, Lawrence County, IN, Madison County, IN, Marion County, IN, Miami County, IN, Monroe County, IN, Montgomery County, IN, Morgan County, IN, Noble County, IN, Ohio County, IN, Owen County, IN, Parke County, IN, Putnam County, IN, Randolph County, IN, Ripley County, IN, Rush County, IN, Shelby County, IN, Steuben County, IN, Switzerland County, IN, Tippecanoe County, IN, Tipton County, IN, Union County, IN, Vermillion County, IN, Vigo County, IN, Wabash County, IN, Warren County, IN, Wayne County, IN, Wells County, IN, Whitley County, IN, Allen County, OH, Auglaize County, OH, Butler County, OH, Champaign County, OH, Clark County, OH, Crawford County, OH, Darke County, OH, Defiance County, OH, Delaware County, OH, Erie County, OH, Franklin County, OH, Fulton County, OH, Greene County, OH, Hamilton County, OH, Hancock County, OH, Hardin County, OH, Henry County, OH, Huron County, OH, Licking County, OH, Logan County, OH, Lucas County, OH, Madison County, OH, Marion County, OH, Mercer County, OH, Miami County, OH, Montgomery County, OH, Morrow County, OH, Ottawa County, OH, Paulding County, OH, Preble County, OH, Putnam County, OH, Richland County, OH, Sandusky County, OH, Seneca County, OH, Shelby County, OH, Union County, OH, Van Wert County, OH, Williams County, OH, Wood County, OH, Wyandot County, OH

The radar

The Northern Indiana radar (KIWX), 90 km from the middle of the area, began a volume at 19:30 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: 2%
Ten or more severe wind reports: 30%
One or more gusts of 65 knots or more: 20%
Ten or more severe hail reports: 30%
One or more hailstones of 2 inches or more: 10%
Six or more combined severe hail and wind reports: 70%

Warnings issued inside it

23 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

Issued	Product	Office	Counties	Lasted
Aug 9, 3:36 PM EDT	Severe Thunderstorm Warning	IWX	Elkhart, LaGrange	54 min
Aug 9, 5:08 PM EDT	Severe Thunderstorm Warning	IWX	DeKalb, Noble	52 min
Aug 9, 5:50 PM EDT	Severe Thunderstorm Warning	IWX	Adams, Allen, Wells	55 min
Aug 9, 5:59 PM EDT	Severe Thunderstorm Warning	IWX	Defiance, Henry, Paulding, Putnam	62 min
Aug 9, 6:12 PM EDT	Severe Thunderstorm Warning	IWX	Allen, Paulding, Putnam	63 min
Aug 9, 6:19 PM EDT	Severe Thunderstorm Warning	IND	Boone	41 min
Aug 9, 6:19 PM EDT	Severe Thunderstorm Warning	CLE	Sandusky, Seneca	41 min
Aug 9, 6:28 PM EDT	Severe Thunderstorm Warning	IWX	Allen, Putnam, Van Wert	77 min
Aug 9, 6:36 PM EDT	Severe Thunderstorm Warning	CLE	Erie, Huron	39 min
Aug 9, 6:38 PM EDT	Severe Thunderstorm Warning	IND	Hendricks	37 min
Aug 9, 6:50 PM EDT	Severe Thunderstorm Warning	CLE	Hancock, Wood	40 min
Aug 9, 6:52 PM EDT	Severe Thunderstorm Warning	ILN	Auglaize, Mercer	38 min
Aug 9, 7:00 PM EDT	Severe Thunderstorm Warning	CLE	Huron, Sandusky, Seneca	45 min
Aug 9, 7:08 PM EDT	Severe Thunderstorm Warning	IND	Marion	37 min
Aug 9, 7:19 PM EDT	Severe Thunderstorm Warning	ILN	Auglaize, Hardin, Logan, Shelby	41 min
Aug 9, 7:24 PM EDT	Severe Thunderstorm Warning	CLE	Erie, Huron, Lorain, Medina	36 min
Aug 9, 7:32 PM EDT	Severe Thunderstorm Warning	IND	Johnson, Shelby	43 min
Aug 9, 7:44 PM EDT	Severe Thunderstorm Warning	CLE	Ashland, Crawford, Huron, Richland, Seneca	46 min
Aug 9, 7:52 PM EDT	Severe Thunderstorm Warning	ILN	Hardin, Logan, Union	38 min
Aug 9, 7:59 PM EDT	Tornado Warning	IND	Shelby	31 min
Aug 9, 8:37 PM EDT	Severe Thunderstorm Warning	IND	Decatur	38 min
Aug 9, 9:02 PM EDT	Severe Thunderstorm Warning	ILN	Ripley	43 min
Aug 9, 9:03 PM EDT	Severe Thunderstorm Warning	IND	Bartholomew, Decatur, Jennings	42 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 267 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 279 J/kg
Mixed-layer CIN: -179 J/kg
Mixed-layer LCL: 972 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 5 m²/s²
0-3 km storm-relative helicity: 56 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 8, 8:27 PM EDT	Mesoscale Discussion	SPC	Benton, Boone, Carroll, Cass, Clinton, Fountain and 16 more	93 min
Aug 9, 1:17 PM EDT	Mesoscale Discussion	SPC	Adams, Benton, Blackford, Boone, Carroll, Cass and 28 more	58 min
Aug 9, 6:35 PM EDT	Mesoscale Discussion	SPC	Adams, Blackford, Boone, Delaware, Fayette, Hamilton and 9 more	85 min
Aug 9, 6:56 PM EDT	Severe Thunderstorm Watch	SPC	Ashland, Ashtabula, Carroll, Columbiana, Coshocton, Cuyahoga and 15 more	5 hr

Nearby

Severe Thunderstorm Watches in Indiana, 2011 Severe Thunderstorm Watches in Ohio, 2011 Every 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.