EF0 tornado, Idaville, Indiana, July 23, 2017

1. EF065 to 85 mphthis tornado

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

2. EF186 to 110 mph

   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

EF0

Date

July 23, 2017

Touchdown

3:33 PM EDT (19:33 UTC)

Lifted

3:41 PM EDT (19:41 UTC)

On the ground

8 minutes

Path length

1.7 miles (2.8 km)

Path width

50 yards (46 m)

Deaths

0

Injuries

0

Property damage

$40,000

County

White County

Touchdown point

40.822, -86.655

Lift-off point

40.808, -86.629

Record number

1707231333-01

13 damage points were recorded along this path by NWS IWX, in the Damage Assessment Toolkit the survey teams carry. The strongest indicator was rated EF1. The highest wind the damage implies is 88 mph.

• boat moved 50 feet from driveway and pushed into tree. Small tree was uprooted by it, but unsure if the boat caused the uproot or just timing.
• Porch/overhang was lifted and flippedi n pieces behind home. Roof was lifted roughy 2 to 3 feet and then dropped back down. Walls inside were reported to have been damage. One resident was at home watching from front door. Neighbor was also watching from house to north and seen tornado from touchdown to passing by. Lower rating due to damage to roof by removal of porch and exposure of roof.
• large piece of porch from front of home. Other debris in tree line to the SE.
• large metal beam from house

Survey points are preliminary and are the raw material the published rating was built from. Source: NWS Damage Assessment Toolkit.

A southeastward moving cold front interacted with a marginally unstable and sheared environment to produce scattered thunderstorms. A few of these storms became severe with isolated reports of wind damage, hail and even a brief tornado.

The tornado touched down in a grove of trees northwest of the intersection of CR 1150 E and 475 N. The tornado proceeded rapidly southeast impacting the edge of residence near the same intersection. Shingle damage was noted on all sides of the house with several tree limbs down. A garage suffered damage as the winds moved through a north facing door. The tornado crossed 1150 E and uprooted or snapped several trees with the winds picking up a porch and most of a roof on a 1 story home. The porch was thrown to the other side of the house and the roof lifted roughly 3 feet up and then set back down. Wall and roof damage has made house unsafe to be in. Damage was noted in corn field behind property with some tree and barn roof damage on 1250 E where the tornado appears to have lifted. Maximum winds were estimated at 85 mph.

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.

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 Marginal Risk. The outlook in force was issued at 16:26 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.

Monticello (MCX), 16 km from the path, in the two hours either side.

From the Iowa Environmental Mesonet's archive of airport observations.

The Northern Indiana radar (KIWX), 99 km away, was scanning. The volume nearest the touchdown began at 19:33 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 2017 tornado in IndianaEvery tornado in Indiana since 1950Warnings in force in Indiana nowThe forecast where you are

1 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.