A slowly-passing cold front combined with adequate instability to produce several strong afternoon thunderstorms across far southeastern central Indiana. One cell towered high enough to trigger a brief microburst over west-central Jennings County.
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Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS IND wrote it up.
A slowly-passing cold front combined with adequate instability to produce several strong afternoon thunderstorms across far southeastern central Indiana. One cell towered high enough to trigger a brief microburst over west-central Jennings County.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Indianapolis, IN wrote its last area forecast discussion before the first event at Sep 1, 11:27 AM EST, 2 hours 19 minutes earlier. Its key messages:
Area Forecast Discussion National Weather Service Indianapolis IN 1227 PM EDT Sun Sep 1 2024 .KEY MESSAGES... - Warm today with some gusty winds - Cooler than normal weather Monday through Wednesday - Rain chances return Thursday into Friday && .FORECAST UPDATE... Issued at 1020 AM EDT Sun Sep 1 2024 - Sunny and warm Surface analysis this morning shows strong high pressure over the Dakotas. A surface trough was found stretching southern Ontario across southern MI to Northern IL. Clear skies were found across most of Central Indiana as well as points upstream across the upper mid west. Winds were from the northwest and dew points were in the lower 60s. Aloft strong ridging was in place over the Rockies, while a trough is in place Ontario and the Great Lakes. This was resulting in northwest across the northern plains into Central Indiana. Ongoing forecast on track. Models suggest spread of afternoon temperatures is very narrow, suggesting high confidence in the lower to middle 80s. Overall forecast handles this well. A few afternoon CU will be possible as max heating is reached, but overall, mostly sunny will be the main theme of the day. Overall, ongoing forecast in good shape. && .SHORT TERM (Today and tonight)... Issued at 226 AM EDT Sun Sep 1 2024 Early This Morning... Some high clouds will continue across the southern forecast area from the exiting system. Meanwhile, patchy fog and stratus will continue to develop with light winds and lingering low level moisture. Today... Any fog and stratus should mix out early today. The morning will be quiet with a good deal of sunshine most areas. However, as a cold front moves in from the north this afternoon, a band of clouds will accompany the front. The front will have little or no upper support, and moisture will be mainly confined to the lower levels of the atmosphere. There might be enough instability for a shower or two to develop, but right now feel that the odds are too low to mention (other than perhaps a sprinkle). Winds will become gusty as the front passes, with gusts to around 20 mph. Highs today will reach the lower and middle 80s. Tonight... High pressure will build in from the north and usher in cooler and drier air. Under mostly clear skies, temperatures will dip into the 50s. && .LONG TERM (Monday through Saturday)... Issued at 226 AM EDT Sun Sep 1 2024 Monday Through Wednesday. Pleasant conditions are then expected for Labor Day in the aftermath of the secondary cold front passage. By Monday morning dewpoints are expected to have fallen to the upper 40s to near 50. Surface flow is expected to remain northerly to northeasterly which will continue to advect dry and cool air into central Indiana with highs in the mid to upper 70s. This quiet and fairly stagnant pattern is expected to continue into Wednesday as the aforementioned surface high pressure continues to slowly move eastward which will gradually bring an end to the northerly flow and bring gradually warming temperatures into Wednesday. Thursday Through Saturday. By Thursday the high pressure will be over the east coast which will allow for the surface flow to become southerly again which will bring a return to temperatures in the mid 80s. Active weather is expected to the south of the Ohio Valley with a broad tropical disturbance, but don't expect any impacts to Indiana other than gradually increasing dewpoints. Another frontal passage is looking increasingly likely towards the end of the week with some model divergence and uncertainty in the ensembles as to the timing. The European/Canadian members continue to look a bit more progressive than the GFS which looks to be a slower outlier. Thus plan to gradually ramp up POPs late Thursday into Friday but keep things fairly broad for now with the highest chances Friday afternoon. Another shot of Canadian air is expected in the aftermath of the frontal passage which will bring another cooler than normal weekend with increasing confidence in the cooler stretch continuing into much of early next week. && .AVIATION (18Z TAF Issuance)... Issued at 1227 PM EDT Sun Sep 1 2024 Impacts: - VFR this TAF Period. Discussion: Some cumulus may accompany a surface trough as it moves south across the TAF sites this afternoon. Strong high pressure over the northern plains will then build across Indiana and the TAF sites tonight and Monday. A moderate pressure gradient across the area may result in wind speeds remaining near 10 knts during the overnight hours. && .IND WATCHES/WARNINGS/ADVISORIES... None. && UPDATE...Puma SHORT TERM...50 LONG TERM...White AVIATION...Puma
Hazardous Weather Outlook National Weather Service Indianapolis IN 351 AM EDT Sun Sep 1 2024 INZ021-028>031-035>049-051>057-060>065-067>072-020800- Carroll-Warren-Tippecanoe-Clinton-Howard-Fountain-Montgomery-Boone- Tipton-Hamilton-Madison-Delaware-Randolph-Vermillion-Parke-Putnam- Hendricks-Marion-Hancock-Henry-Vigo-Clay-Owen-Morgan-Johnson-Shelby- Rush-Sullivan-Greene-Monroe-Brown-Bartholomew-Decatur-Knox-Daviess- Martin-Lawrence-Jackson-Jennings- 351 AM EDT Sun Sep 1 2024 This hazardous weather outlook is for central Indiana. .DAY ONE...Today and Tonight. No hazardous weather is expected at this time. .DAYS TWO THROUGH SEVEN...Monday through Saturday. Thunderstorm chances return Thursday into Friday for all or part of central Indiana. .SPOTTER INFORMATION STATEMENT... Spotter activation is not anticipated. && More information, along with other weather, hydrological and climate information can be found at http://weather.gov/ind
The Indianapolis radar (KIND), 95 km away, was scanning. The volume nearest the first event began at 18:46 UTC.
1 thunderstorm wind. Local standard time, as filed.
Thunderstorm winds consistent with a brief microburst downed oak and hickory trees into a metal pole barn at 5850 West County Road 100 South. Damage continued for about 0.5 miles east laying down crops.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Indiana in 2024Every state in 2024This day in weather historyWarnings in Indiana, September 2024
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 1206708.