Alert archive / Indiana / Tornado Watches in 2011
Tornado Watch 242
The Storm Prediction Center issued this tornado watch at Apr 27, 2011, 7:22 PM EDT for 55 counties in Indiana; 12 counties in Kentucky; 42 counties in Ohio. It was in force for 8 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 27, 2011, 7:22 PM EDT (23:22 UTC)
- Expired
- Apr 28, 2011, 3:00 AM EDT
- In force
- 8 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 0.5 in
- Strongest gust expected
- 60 kt
All 109 counties
Adams 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, Daviess County, IN, Dearborn County, IN, Decatur County, IN, Delaware County, IN, Fayette County, IN, Fountain County, IN, Franklin 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, Knox County, IN, Lawrence County, IN, Madison County, IN, Marion County, IN, Martin County, IN, Miami County, IN, Monroe County, IN, Montgomery County, IN, Morgan 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, Sullivan County, IN, Switzerland County, IN, Tippecanoe County, IN, Tipton County, IN, Union County, IN, Vermillion County, IN, Vigo County, IN, Wabash County, IN, Wayne County, IN, Wells County, IN, Boone County, KY, Bracken County, KY, Campbell County, KY, Carroll County, KY, Gallatin County, KY, Grant County, KY, Kenton County, KY, Lewis County, KY, Mason County, KY, Owen County, KY, Pendleton County, KY, Robertson County, KY, Adams County, OH, Allen County, OH, Auglaize County, OH, Brown County, OH, Butler County, OH, Champaign County, OH, Clark County, OH, Clermont County, OH, Clinton County, OH, Crawford County, OH, Darke County, OH, Delaware County, OH, Fairfield County, OH, Fayette County, OH, Franklin County, OH, Greene County, OH, Hamilton County, OH, Hancock County, OH, Hardin County, OH, Highland County, OH, Hocking County, OH, Knox County, OH, Licking County, OH, Logan County, OH, Madison County, OH, Marion County, OH, Mercer County, OH, Miami County, OH, Montgomery County, OH, Morrow County, OH, Pickaway County, OH, Pike County, OH, Preble County, OH, Putnam County, OH, Richland County, OH, Ross County, OH, Scioto County, OH, Shelby County, OH, Union County, OH, Van Wert County, OH, Warren County, OH, Wyandot County, OH
The radar
The Indianapolis radar (KIND), 72 km from the middle of the area, began a volume at 23:23 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
- 40%
- One or more EF2 to EF5 tornadoes
- 20%
- 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
- 5%
- Six or more combined severe hail and wind reports
- 70%
Warnings issued inside it
10 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 27, 10:36 PM EDT | Flash Flood Warning | ILN | Lewis | 3 hr |
| Apr 27, 10:54 PM EDT | Tornado Warning | IWX | Jay | 51 min |
| Apr 27, 10:58 PM EDT | Tornado Warning | IND | Delaware, Randolph | 27 min |
| Apr 27, 11:15 PM EDT | Severe Thunderstorm Warning | ILN | Darke, Mercer | 60 min |
| Apr 27, 11:19 PM EDT | Tornado Warning | IND | Randolph | 15 min |
| Apr 27, 11:31 PM EDT | Tornado Warning | ILN | Mercer | 29 min |
| Apr 27, 11:55 PM EDT | Tornado Warning | IWX | Allen, Van Wert | 36 min |
| Apr 27, 11:58 PM EDT | Tornado Warning | ILN | Auglaize, Mercer | 29 min |
| Apr 28, 2:10 AM EDT | Severe Thunderstorm Warning | ILN | Champaign, Clark, Clinton, Fayette, Greene, Madison and 3 more | 50 min |
| Apr 28, 2:51 AM EDT | Severe Thunderstorm Warning | ILN | Delaware, Fairfield, Fayette, Franklin, Hardin, Hocking and 6 more | 54 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
Cncnati-Daytn, OH (KILN), launched 12:00Z, 11.4 hours before the alert went out and 155 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
- 279 J/kg
- Mixed-layer CIN
- -56 J/kg
- Mixed-layer LCL
- 846 m above ground
- 0-6 km bulk shear
- 56 kt
- 0-1 km storm-relative helicity
- 470 m²/s²
- 0-3 km storm-relative helicity
- 503 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 4.9
The text
As transmitted, in the capitals the NWS used until 2016.
093
WWUS20 KWNS 272322
SEL2
SPC WW 272322
INZ000-KYZ000-OHZ000-280700-
URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 242
NWS STORM PREDICTION CENTER NORMAN OK
725 PM EDT WED APR 27 2011
THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF
INDIANA
NORTHERN KENTUCKY
WESTERN AND CENTRAL OHIO
EFFECTIVE THIS WEDNESDAY NIGHT AND THURSDAY MORNING FROM 725 PM
UNTIL 300 AM EDT.
TORNADOES...HAIL TO 0.5 INCH IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.
THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 75 STATUTE
MILES NORTH AND SOUTH OF A LINE FROM 15 MILES NORTHWEST OF TERRE
HAUTE INDIANA TO 25 MILES EAST SOUTHEAST OF COLUMBUS OHIO. FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU2).
REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH
AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR
THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS
AND POSSIBLE WARNINGS.
OTHER WATCH INFORMATION...CONTINUE...WW 232...WW 235...WW
236...WW 237...WW 238...WW 239...WW 240...WW 241...
DISCUSSION...SURFACE LOW OVER FAR SWRN IND IS FORECAST TO DEVELOP
NEWD TO NEAR CLE BY 28/06Z IN ADVANCE OF STRONG VORTICITY MAXIMUM
CURRENTLY NEAR THE CONFLUENCE OF THE MS/OH RIVERS. INTENSE DYNAMIC
FORCING FOR ASCENT ASSOCIATED WITH THIS UPPER-LEVEL SYSTEM WILL BE
SUPPORTIVE OF SUFFICIENT DESTABILIZATION FOR LOW-TOPPED
SUPERCELLS/BOWS CAPABLE OF TORNADOES AND DAMAGING WINDS.
AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 0.5 INCH. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
300. MEAN STORM MOTION VECTOR 21050.
...MEADSPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 26, 8:33 PM EDT | Mesoscale Discussion | SPC | Adams, Allen, Blackford, Boone, Carroll, Cass and 35 more | 57 min |
| Apr 26, 9:35 PM EDT | Mesoscale Discussion | SPC | Bartholomew, Boone, Brown, Clark, Clay, Crawford and 44 more | 55 min |
| Apr 26, 10:13 PM EDT | Mesoscale Discussion | SPC | Posey, Vanderburgh, Warrick | 62 min |
| Apr 26, 10:58 PM EDT | Tornado Watch | SPC | Clark, Crawford, Dubois, Floyd, Harrison, Jefferson and 4 more | 7 hr |
| Apr 27, 4:06 PM EDT | Mesoscale Discussion | SPC | Crawford, Daviess, Dubois, Gibson, Knox, Lawrence and 8 more | 54 min |
| Apr 27, 4:29 PM EDT | Tornado Watch | SPC | Gibson, Pike, Posey, Spencer, Vanderburgh, Warrick | 5 hr |
| Apr 27, 5:38 PM EDT | Mesoscale Discussion | SPC | Clark, Crawford, Floyd, Harrison, Jefferson, Ohio and 4 more | 37 min |
| Apr 27, 5:44 PM EDT | Tornado Watch | SPC | Clark, Crawford, Dubois, Floyd, Harrison, Jefferson and 5 more | 7 hr |
| Apr 27, 6:27 PM EDT | Mesoscale Discussion | SPC | Bartholomew, Blackford, Boone, Brown, Clark, Clay and 53 more | 63 min |
| Apr 27, 5:33 AM EDT | Mesoscale Discussion | SPC | Adair, Barren, Boyle, Casey, Clinton, Cumberland and 12 more | 57 min |
| Apr 27, 6:07 AM EDT | Tornado Watch | SPC | Adair, Allen, Anderson, Barren, Bourbon, Boyle and 28 more | 5 hr |
| Apr 27, 8:34 AM EDT | Tornado Watch | SPC | Bath, Bell, Breathitt, Clay, Elliott, Estill and 21 more | 4 hr |
| Apr 27, 9:39 AM EDT | Mesoscale Discussion | SPC | Boyd, Carter, Greenup, Lewis | 66 min |
| Apr 27, 1:42 PM EDT | Severe Thunderstorm Watch | SPC | Ballard, Caldwell, Calloway, Carlisle, Christian, Crittenden and 16 more | 5 hr |
| Apr 27, 3:22 PM EDT | Mesoscale Discussion | SPC | Bell, Breathitt, Clay, Floyd, Harlan, Jackson and 11 more | 83 min |
| Apr 27, 1:24 PM EDT | Mesoscale Discussion | SPC | Ashtabula, Belmont, Carroll, Columbiana, Guernsey, Harrison and 9 more | 96 min |
Nearby
Tornado Watches in Indiana, 2011Tornado Watches in Ohio, 2011Tornado Watches in Kentucky, 2011Every tornado 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.