EF1 tornado, St Meinrad to Adyeville, Indiana, June 26, 2011

1. EF065 to 85 mph

   Light damage. Surface peeled off some roofs, gutters and siding damaged, branches broken, shallow-rooted trees pushed over.

2. EF186 to 110 mphthis tornado

   Moderate damage. Roofs badly stripped, mobile homes overturned or badly damaged, exterior doors lost, windows broken.

3. EF2111 to 135 mph

   Considerable damage. Roofs torn off well-built houses, frame homes shifted on their foundations, mobile homes destroyed, large trees snapped or uprooted, cars lifted off the ground.

4. EF3136 to 165 mph

   Severe damage. Whole stories of well-built houses destroyed, large buildings badly damaged, trains overturned, trees debarked, heavy cars lifted and thrown.

5. EF4166 to 200 mph

   Devastating damage. Well-built houses leveled, structures with weak foundations moved some distance, cars thrown and large missiles generated.

6. EF5over 200 mph

   Incredible damage. Strong frame houses swept off their foundations, car-sized missiles thrown more than 100 meters, steel-reinforced concrete badly damaged, high-rise buildings deformed.

7. Unrated

   The survey recorded a tornado but could not put a number on it, most often because it crossed open country and damaged nothing a rating can be read from.

Rating

EF1

Date

June 26, 2011

Touchdown

2:12 AM CDT (07:12 UTC)

Lifted

2:17 AM CDT (07:17 UTC)

On the ground

5 minutes

Path length

3.5 miles (5.7 km)

Path width

200 yards (183 m)

Deaths

0

Injuries

0

Property damage

$60,000

Counties

Perry and Spencer counties

Touchdown point

38.160, -86.820

Lift-off point

38.170, -86.771

Record number

1106260112-01

A bow echo brought locally strong winds and isolated damage. The bow echo was supported by a warm front that extended east-northeast from the southern Plains across the Lower Ohio Valley. A 500 mb shortwave trough moved southeast from the Upper Mississippi Valley toward the Ohio Valley, further enhancing the strength of the mesoscale convective system.

A strong bow echo brought sporadic damaging winds and two tornadoes to southwestern Indiana during the early morning hours on the 26th of June. The two tornadoes were embedded within the leading edge of the squall line.

The tornado touched down on the southern end of the St. Meinrad Seminary grounds, destroying a cinder block outbuilding and taking 100 feet of roofing off a large metal outbuilding. The tornado also uprooted numerous trees and ripped sections of roofing off several other buildings before moving off to the east-northeast. Peak winds were estimated between 95 and 100 mph. The tornado continued into Perry County.

This tornado had a total path length of 2.3 miles and touched down in Spencer County 0.7 miles south of Saint Meinrad. After entering Perry County, this twister remained on the ground for 1.4 miles from approximately 1:14 CST to 1:17 CST. A damage survey found that this tornado rated an EF-1 with a maximum width of 200 yards. After destroying a cinder block outbuilding near the Saint Meinrad Seminary, the tornado entered Perry County and uprooted numerous trees along a narrowing path, finally lifting just off Catnip Road.

From NOAA NCEI's Storm Events Database, the narrative the local forecast office wrote for Storm Data.

No tornado warning for this county appears in the archive as in force at the moment the tornado touched down.

The county was under a severe thunderstorm watch, issued at 07:00 UTC and running to 08:20 UTC.

Every warning and watch covering the touchdown point that day, from the Iowa Environmental Mesonet's archive of National Weather Service products. Lead time is measured from the issue of the warning in force to the touchdown time in the database, both of which were recorded to the minute by different people.

The Storm Prediction Center had this point in a General Thunderstorms Risk. The outlook in force was issued at 06:00 UTC.

SPC's Day 1 convective outlook as it stood when the tornado began, read at the touchdown point. The same archive is on the radar archive.

The radiosonde launches on either side of the tornado, from the nearest station that was launching then, drawn and analyzed the way Storm Lab does: the same diagram, the same parcel and shear definitions SPC's mesoanalysis uses.

The Louisville radar (KLVX), 77 km away, was scanning. The volume nearest the touchdown began at 07:12 UTC.

Open the radar archive at this moment, over the track

Reflectivity and velocity, decoded from the Level II archive in the browser. Volumes take a few seconds to open the first time.

Local storm reports within 60 km of the path, in the three hours either side.

From the Iowa Environmental Mesonet's archive of National Weather Service local storm reports.

The live radar over the trackEvery 2011 tornado in IndianaEvery tornado in Indiana since 1950Warnings in force in Indiana nowThe forecast where you are

6 more were confirmed in the United States that day.

Ratings are the survey's, read off the damage rather than measured; the rating scale is above. Tornado counts rise through the record as reporting improved, so a year in the 1950s is not comparable with one today except for the strongest tornadoes, which were always noticed.

NOAA Storm Prediction Center tornado database, 1950-2025, the official record kept by NOAA's Storm Prediction Center.