Tornadoes · United States · Indiana · 2026
Unrated tornado, Jasper County, Indiana, August 12, 2026
This Unrated tornado ran 0.4 miles across Jasper County on August 12, 2026, touching down at 10:49 AM CDT and reaching 50 yards wide. It killed nobody.
Preliminary. This is NWS LOT's damage survey, filed in the Damage Assessment Toolkit as Rensselaer. The rating, the path and the casualties are the survey's and can change while it is revised. The Storm Prediction Center compiles the official record of 2026 from these surveys and publishes it in the spring of 2027; this page moves to that tornado's permanent address when it does.
The rating scale
Tracks are drawn in the color of the rating. The Enhanced Fujita scale rates the damage rather than measuring the wind: the speeds are what that damage is taken to imply.
EF065 to 85 mph
Light damage. Surface peeled off some roofs, gutters and siding damaged, branches broken, shallow-rooted trees pushed over.
EF186 to 110 mph
Moderate damage. Roofs badly stripped, mobile homes overturned or badly damaged, exterior doors lost, windows broken.
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.
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.
EF4166 to 200 mph
Devastating damage. Well-built houses leveled, structures with weak foundations moved some distance, cars thrown and large missiles generated.
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.
Unratedthis tornado
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.
The survey
- Rating, as surveyed
- Unrated, preliminary
- Date
- August 12, 2026
- Touchdown
- 10:49 AM CDT (15:49 UTC)
- Lifted
- 10:50 AM CDT (15:50 UTC)
- On the ground
- 1 minutes
- Path length
- 0.4 miles (0.7 km)
- Path width
- 50 yards (46 m)
- Deaths
- 0
- Injuries
- 0
- County
- Jasper County
- Touchdown point
- 40.941, -87.111
- Lift-off point
- 40.944, -87.104
- Surveyed by
- NWS LOT
- The office's name for it
- Rensselaer
- Survey last edited
- September 5, 2026
- Record number
- None yet. SPC numbers 2026 in the spring of 2027.
What the survey found
A narrow tornadic damage path through crops was observed in Sentinel-2 satellite imagery just east of Rensselaer. The damage path was a little over 0.4 miles long and about 50 yards wide. Since this tornado did not cause any known damage to any qualified damage indicators, it has been assigned an EF-U rating.
Written by NWS LOT in the NWS Damage Assessment Toolkit. A survey is revised as better evidence arrives.
The damage survey
2 damage points were recorded along this path by NWS LOT, in the Damage Assessment Toolkit the survey teams carry. The strongest indicator was rated EFU.
- Approximate start point of narrow damage path through crops in Sentinel-2 satellite imagery.
- Approximate location of last instance of crop damage evident in Sentinel-2 satellite imagery.
Survey points are preliminary and are the raw material the published rating was built from. Source: NWS Damage Assessment Toolkit.
The warnings
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 13:29 UTC and running to 16:45 UTC.
| Issued (UTC) | Expired | Product | Office |
|---|---|---|---|
| 13:29 UTC | 16:45 UTC | Severe Thunderstorm Watch | LOT |
| 15:14 UTC | 16:15 UTC | Severe Thunderstorm Warning | LOT |
| 15:17 UTC | 17:33 UTC | Flood Advisory | LOT |
| 15:42 UTC | 17:33 UTC | Flash Flood Warning | LOT |
| 17:33 UTC | 19:30 UTC | Flood Advisory | LOT |
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 forecast that day
The Storm Prediction Center had this point in a Slight Risk. The outlook in force was issued at 12:36 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.
What forecasters said that day
The local office's own words before the tornado touched down, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Chicago, IL wrote its last area forecast discussion before the tornado touched down at Aug 12, 7:19 AM CDT, 3 hours 30 minutes earlier. Its key messages:
- Isolated strong storms possible early this morning.
- Another fast-moving line of strong/severe thunderstorms is expected later this morning with a damaging wind and heavy rainfall threat.
- Our active, stormy weather pattern is expected to persist into the weekend with periodic chances of severe weather and heavy rainfall which could lead to flooding.
- A period of dry weather may finally arrive early next week.
Area forecast discussion, Aug 12, 7:19 AM CDT, 3 hours 30 minutes before
Area Forecast Discussion National Weather Service Chicago/Romeoville, IL 719 AM CDT Wed Aug 12 2026 .KEY MESSAGES... - Isolated strong storms possible early this morning. - Another fast-moving line of strong/severe thunderstorms is expected later this morning with a damaging wind and heavy rainfall threat. - Our active, stormy weather pattern is expected to persist into the weekend with periodic chances of severe weather and heavy rainfall which could lead to flooding. - A period of dry weather may finally arrive early next week. && .DISCUSSION... Issued at 329 AM CDT Wed Aug 12 2026 Forecast remains complex within our persistent pattern of active weather. Main concern in the near term is the potential for another fast-moving line of wind-producing storms across at least a portion of the area later this morning/midday. A nearly stationary frontal boundary remains in place across the Midwest early this morning, stretching roughly from near Omaha to north of Des Moines to Milwaukee. Complicating the surface pattern however, is the remnant outflow boundary from Tuesday's derecho, which intersects the front near Waterloo, IA and extends southeast and bisects IL along a SQI-BMI-MTO-EVV line. The west/northwest periphery of the cold pool appears to be fairly shallow however, per 00Z DVN and ILX soundings (as compared to ILM farther to the east/southeast). Aloft, a subtle mid-level short wave has been evident in GOES vapor imagery transiting northern IA and entering northwest IL, inducing a modest west-southwest 25-30 kt low level jet from northern MO into northern/central IL/IN. With an axis of 3500-4000 J/kg MUCAPE along/north of the front/outflow boundary across the region, there's been concern since last evening for the potential to develop elevated convection within a northwest- southeast arc across the area (along/northeast of the remnant outflow boundary). So far however, only isolated updraft attempts have been noted and successive CAM runs have backed off considerably in convective coverage across the forecast area through daybreak. That said, we'll have to continue to monitor for any deeper updraft development, as the environment would support the potential for strong elevated storms with a hail threat if they develop. Of greater concern this morning, is an MCS which has been developing southeast from western South Dakota into northern Nebraska overnight in association with an attendant mid-level short wave and MCV. There is notable CAM support indicating this MCS becoming more organized across eastern NE/western IA toward daybreak, then propagating quickly eastward along the aforementioned surface front/outflow boundaries into our IL cwa after 14/15Z (9-10 AM) this morning. While not quite as robust as yesterday's derecho, high-res guidance does explicitly indicate 60-70 mph winds across parts of our forecast area with this MCS. CAMs indicate an easterly propagation of this system across the cwa, though with the remnant outflow likely mixing back north across the southern half of our cwa that may support more of an east-southeast or southeast track as we saw yesterday. SPC has pulled their new Day 1 slight (level 2 of 5) severe risk up to about a Dixon-Renssalear line. It's possible that could be adjusted further if the evolution of the MCS supports it later this morning. For now, will be advertising the severe threat (primarily wind) even a little north of that for this morning/midday. Thunderstorm threat should then diminish markedly from the west into this afternoon in the wake of the MCS and parent short wave. There may be somewhat of a lull in convection coverage/potential tonight into early Thursday morning, depending on the footprint of the anticipated MCS cold pool, and with some weak mid-level height rises indicated in model guidance. Have trimmed pops during this period especially up north along the IL/WI border and Lake Michigan. Another mid- level wave (currently over NV/UT) is then progged move into the region on Thursday which look to increase shower and thunderstorm chances again during the day and with additional rounds through at least Thursday night. These continued rounds of storms will maintain at least a marginal severe threat and a threat of flash flooding if storms train over the same areas. Unfortunately, medium-range guidance continues to depict our active pattern remaining in place across the region into the weekend. There does appear to be decent agreement in the global models/ensembles that high pressure eventually settles across the western Lakes region by Monday-Tuesday of next week, pushing our stalled frontal zone to the south and providing a period of dry weather at that time. Ratzer && .AVIATION /12Z TAFS THROUGH 18Z THURSDAY/... Issued at 719 AM CDT Wed Aug 12 2026 Key Messages: - A complex of storms is likely to affect the terminals between mid-morning and mid-afternoon today. Strong to severe wind gusts will be possible with these storms. - IFR/LIFR ceilings and visibilities possible at RFD this morning, while patchy MVFR ceilings remain possible elsewhere. Additional low ceilings and reduced visibilities possible overnight tonight into Thursday morning. An organized thunderstorm complex is entering northern Illinois early this morning and will approach the terminals during the mid-late morning. Some uncertainty remains with whether these storm complex will begin to dive southeastward along an instability gradient or whether it will continue to progress more towards the east and into the heart of the Chicago metro. Current thinking is that the strongest winds with this storm complex (50+ kts) may remain south of the terminals, but the threat for lightning at the Chicago metro terminals remains high enough to maintain the going TEMPO groups. Also maintained a VCTS mention at RFD, but the latest radar trends that the storms should remain south of RFD. Conditions are likely to dry out by mid-afternoon. IFR/LIFR ceilings and some visibility reductions are being observed at/near RFD this morning, while patchy MVFR ceilings are being observed elsewhere at press time. These conditions may stick around for a bit this morning, but a return to prevailing VFR conditions is favored by this afternoon. Persisting rich low-level moisture and light winds may allow for another episode of sub-VFR ceilings and visibilities late tonight into tomorrow morning. The potential for this appears to be greatest at RFD, DPA, and GYY, but based on how some forecast guidance fared poorly with the visibility and low ceiling forecast this morning, confidence in this occurring is only low-medium. Ogorek && .LOT WATCHES/WARNINGS/ADVISORIES... IL...None. IN...None. LM...None. && Visit us at weather.gov/chicago
Hazardous weather outlook, Aug 12, 4:20 AM CDT, 6 hours 29 minutes before
Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
420 AM CDT Wed Aug 12 2026
ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-002-
010-011-019-130930-
Winnebago-Boone-McHenry-Lake IL-Ogle-Lee-De Kalb-Kane-DuPage-
La Salle-Kendall-Grundy-Kankakee-Livingston-Iroquois-Ford-
Northern Cook-Central Cook-Southern Cook-Northern Will-
Southern Will-Eastern Will-Lake IN-Porter-Newton-Jasper-Benton-
420 AM CDT Wed Aug 12 2026 /520 AM EDT Wed Aug 12 2026/
This Hazardous Weather Outlook is for portions of north central
Illinois...northeast Illinois and northwest Indiana.
.DAY ONE...Today and Tonight.
Weather hazards expected...
Elevated Thunderstorm Risk...with an associated:
Level 1 of 5 Tornado Risk.
Level 2 of 5 Damaging Wind Risk...up to 75 mph.
Level 1 of 5 Large Hail Risk...up to quarter size.
Elevated Flooding Risk.
DISCUSSION...
Isolated thunderstorms are possible early this morning, the
strongest of which may be capable of producing brief hail and
localized downpours.
A fast-moving line of strong to severe thunderstorms is then
expected to move east across the area from mid-morning into early
this afternoon. These storms will have the potential to produce
damaging winds and isolated tornadoes, in addition to producing
torrential rains which may lead to localized flooding. At this
time, the greatest risk of severe would appear to be from the I-88
corridor south and eastward.
.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.
Thursday and Friday...
Elevated Flooding Risk.
Limited Thunderstorm Risk...with an associated:
Level 1 of 5 Severe Thunderstorm Risk.
Saturday...
Elevated Flooding Risk.
Limited Thunderstorm Risk.
Sunday...
Limited Thunderstorm Risk.
DISCUSSION...
An active weather pattern with periodic thunderstorm chances is
expected to persist into the weekend. Some of these storms may be
strong to severe at times, as well as capable of producing heavy
rainfall which could lead to flash flooding.
.SPOTTER INFORMATION STATEMENT...
Spotters may be needed from mid-morning into early this
afternoon.
GENERAL STORM MOTION OF THE DAY:
Moving toward the east-southeast at around 35 mph for early morning
storms. If mid-morning storms form a bowing line, it may move east at
45 to 55 mph.
LMZ740>745-130930-
Winthrop Harbor to Wilmette Harbor IL-
Wilmette Harbor to Northerly Island IL-
Northerly Island to Calumet Harbor IL-
Calumet Harbor IL to Gary IN-Gary to Burns Harbor IN-
Burns Harbor to Michigan City IN-
420 AM CDT Wed Aug 12 2026
This Hazardous Weather Outlook is for portions of the Illinois
nearshore waters of Lake Michigan and the Indiana nearshore
waters of Lake Michigan.
.DAY ONE...Today and Tonight.
Weather hazards expected...
Elevated Thunderstorm Risk...with an associated:
Level 1 of 5 Thunderstorm Wind Gust Risk...up to 60 knots.
Level 1 of 5 Hail Risk...up to quarter size.
.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.
Thursday...
Limited Thunderstorm Risk.
Friday...
Limited Thunderstorm Risk...with an associated:
Level 1 of 5 Severe Thunderstorm Risk.
Saturday and Sunday...
Limited Thunderstorm Risk.
Ratzer
Visit us at www.weather.gov/chicagoIn the hours before
Local storm report, Aug 12, 9:11 AM CDT, 1 hour 38 minutes before
Preliminary Local Storm Report
National Weather Service Chicago IL
911 AM CDT Wed Aug 12 2026
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0842 AM Tstm Wnd Dmg Sublette 41.64N 89.23W
08/12/2026 Lee IL Law Enforcement
large tree branch (est 8-12 inch) snapped
and blocking roadway.
&&
sbLocal storm report, Aug 12, 9:13 AM CDT, 1 hour 36 minutes before
Preliminary Local Storm Report
National Weather Service Chicago IL
913 AM CDT Wed Aug 12 2026
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0902 AM Tstm Wnd Gst 4 NNW Naplate 41.38N 88.91W
08/12/2026 M53 MPH La Salle IL Public
Private weather station: 4.2 NNW Naplate.
&&
sbLocal storm report, Aug 12, 9:26 AM CDT, 1 hour 23 minutes before
Preliminary Local Storm Report
National Weather Service Chicago IL
926 AM CDT Wed Aug 12 2026
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0919 AM Tstm Wnd Gst Somonauk 41.63N 88.68W
08/12/2026 M60 MPH De Kalb IL Emergency Mngr
&&
sbLocal storm report, Aug 12, 9:51 AM CDT, 58 minutes before
Preliminary Local Storm Report
National Weather Service Chicago IL
951 AM CDT Wed Aug 12 2026
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0930 AM Tstm Wnd Gst 3 NNE Verona 41.26N 88.48W
08/12/2026 M54 MPH Grundy IL Public
Private weather station: 3.3 NNE Verona.
&&
sbLocal storm report, Aug 12, 10:23 AM CDT, 26 minutes before
Preliminary Local Storm Report
National Weather Service Chicago IL
1023 AM CDT Wed Aug 12 2026
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0937 AM Tstm Wnd Dmg 3 NNE Morris 41.40N 88.40W
08/12/2026 Grundy IL Public
power lines down near RT 6 and Ashley road.
&&
sbLocal storm report, Aug 12, 10:26 AM CDT, 23 minutes before
Preliminary Local Storm Report
National Weather Service Chicago IL
1026 AM CDT Wed Aug 12 2026
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1015 AM Flood 2 NW Rockdale 41.53N 88.15W
08/12/2026 Will IL Public
a few inches of standing water on Glenwood
Ave. relayed via social media.
&&
sbThe air that afternoon
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.
Lincoln, IL (KILX), 12:00Z
3.8 hours before the tornado, 154 km from the path. August 12, 2026.
- Mixed-layer CAPE
- 2166 J/kg
- Mixed-layer CIN
- -186 J/kg
- Surface CAPE
- 2407 J/kg
- Mixed-layer LCL
- 1652 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- 50 m²/s²
- 0-3 km storm-relative helicity
- 54 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
- 0-3 km lapse rate
- 4.1 K/km
Lincoln, IL (KILX), 00:00Z
8.2 hours after it, 154 km from the path. August 13, 2026.
- Mixed-layer CAPE
- 366 J/kg
- Mixed-layer CIN
- -161 J/kg
- Surface CAPE
- 1576 J/kg
- Mixed-layer LCL
- 928 m above ground
- 0-6 km bulk shear
- 43 kt
- 0-1 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 191 m²/s²
- 0-3 km storm-relative helicity
- 279 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 9.7
- 0-3 km lapse rate
- 5.8 K/km
The surface observations
Rensselaer (RZL), 6 km from the path, in the two hours either side.
| Time (UTC) | Temp (°F) | Dew point (°F) | Wind | Gust (kt) | Pressure (mb) | Weather |
|---|---|---|---|---|---|---|
| 13:55 UTC | 73.4 | 73.4 | 170° 5 kt | 1010.5 | ||
| 14:15 UTC | 73.4 | 73.4 | 170° 3 kt | 1010.5 | ||
| 14:35 UTC | 75.2 | 73.4 | 200° 3 kt | 1010.8 | ||
| 14:55 UTC | 73.4 | 73.4 | 170° 4 kt | 1010.2 | -VCTSRA | |
| 15:15 UTC | 73.4 | 73.4 | 0° 0 kt | 1010.8 | -VCTSRA | |
| 15:35 UTC | 73.4 | 73.4 | 210° 6 kt | 1010.2 | VCTSRA | |
| 15:55 UTC | 69.8 | 69.8 | 320° 20 kt | 44 | 1013.5 | +TSRA |
| 16:15 UTC | 68 | 68 | 280° 7 kt | 1014.2 | TSRA | |
| 16:35 UTC | 68 | 68 | 270° 7 kt | 1013.2 | VCTSRA | |
| 16:55 UTC | 69.8 | 68 | ||||
| 17:15 UTC | 69.8 | 68 | ||||
| 17:35 UTC | 69.8 | 69.8 | 0° 0 kt | 1012.2 | -RA |
From the Iowa Environmental Mesonet's archive of airport observations.
The radar
The Chicago radar (KLOT), 110 km away, was scanning. The volume nearest the touchdown began at 15:52 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.
What was reported nearby
Local storm reports within 60 km of the path, in the three hours either side.
| Time (UTC) | Report | Where | County | Remark |
|---|---|---|---|---|
| 15:35 UTC | TSTM WND DMG | Morocco | Newton, IN | Photo shared on social media showing large trees downed on a garage in Morocco, Indiana. Time estimated by radar. |
| 15:40 UTC | TSTM WND DMG | Brook | Newton, IN | Report shared on social media of power poles downed in Brook. Time estimated by radar. |
| 15:52 UTC | TSTM WND DMG | 6 Ese Rensselaer | Jasper, IN | Report relayed via social media of downed power poles in McCoysburg. The nearby AWOS in Rensselaer measured a peak wind gust of 51 mph. Time estimated by radar. |
| 16:09 UTC | RAIN 2.94 | 2 Ne Roselawn | Newton, IN | Private weather station: KINDEMOT27 reported 2.94 inches so far, with 2.82 in past hour. |
| 16:13 UTC | FLASH FLOOD | Royal Center | Cass, IN | Deputy Town Marshall reporting streets flooding in front of Pioneer Elementary Schooll. |
| 16:13 UTC | FLASH FLOOD | Royal Center | Cass, IN | Deputy Town Marshall reporting streets flooding in front of Pioneer Elementary Schooll. |
| 16:22 UTC | FLASH FLOOD | 2 Sse Thornhope | Cass, IN | INDOT being requested for high water (possible road closure) on US 35 near Royal Center Pike. |
| 16:22 UTC | FLASH FLOOD | 2 Sse Thornhope | Cass, IN | INDOT being requested for high water (possible road closure) on US 35 near Royal Center Pike. |
| 16:30 UTC | FLOOD | Roselawn | Newton, IN | report of yard flooding and 2 inches of water flowing on roadway. Exact location in town unknown. |
| 17:30 UTC | TSTM WND DMG | 1 Sse Winamac | Pulaski, IN | Video showing US 35 flooded at the Caseys gas station south of Winamac. |
| 17:30 UTC | TSTM WND DMG | 1 Sse Winamac | Pulaski, IN | Video showing US 35 flooded at the Caseys gas station south of Winamac. |
| 18:20 UTC | RAIN 11 | 1 E Winamac | Pulaski, IN | Public report of flooding near a home on the east side of Winamac where they estimate almost 11 inches of rain has fallen since yesterday morning. This is 36 hour rainfall total. |
| 18:20 UTC | RAIN 11 | 1 E Winamac | Pulaski, IN | Public report of flooding near a home on the east side of Winamac where they estimate almost 11 inches of rain has fallen since yesterday morning. This is 36 hour rainfall total. |
From the Iowa Environmental Mesonet's archive of National Weather Service local storm reports.
This ground now
The live radar over the trackEvery 2026 tornado in IndianaEvery tornado in Indiana since 1950Warnings in force in Indiana nowThe forecast where you are
The other tornadoes of August 12, 2026
2 more have been surveyed in the United States that day, so far.
What this means
Ratings are the survey's, read off the damage rather than measured; the rating scale is above. A survey can be revised, so the rating, the path and the casualties can all still change.
Sources
NWS Damage Assessment Toolkit, the record the survey teams file from the damage, and NOAA Storm Prediction Center storm reports. Neither is the official database for 2026, which SPC publishes in the spring of 2027.