A northward moving warm front interacted with limited instability and shear to produce a line of showers and thunderstorms. While most remained below severe levels, one storm produced an isolated downburst with some localized damage reported.
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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 IWX wrote it up.
A northward moving warm front interacted with limited instability and shear to produce a line of showers and thunderstorms. While most remained below severe levels, one storm produced an isolated downburst with some localized damage reported.
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 Northern Indiana wrote its last area forecast discussion before the first event at Sep 20, 1:21 PM CST, 1 hour 14 minutes earlier. Its key messages:
Area Forecast Discussion National Weather Service Northern Indiana 321 PM EDT Sat Sep 20 2025 .KEY MESSAGES... - A wet period is ahead this entire upcoming week with numerous chances for showers. - Isolated to scattered thunderstorms are possible most days. - The best chance for marginally severe storms is Sunday with strong to possibly damaging winds the greatest threat. && .DISCUSSION... Issued at 107 PM EDT Sat Sep 20 2025 Scattered showers and an occasional isolated thunderstorm were occurring west of Highway 31 and mainly west of a line from Eau Claire to SBN to Monticello. Locally heavy rainfall of 1-2 inches had fallen earlier with showers and storms. The latest HRRR indicates more activity should redevelop tonight after 01Z (9pm EDT) west of Interstate 69. Severe weather is not expected but locally heavy rainfall is possible. The SPC has the entire forecast area in a Marginal severe storm risk Sunday. More energy from the upper level trof should reach northern Indiana and be accompanied by unidirectional flow at 20 to 30 knots with CAPE values < 800 J/Kg. The best chances for any strong to severe storms favor 3pm EDT to 11pm EDT. Strong to possibly damaging winds are the greatest threat. A very active pattern is setting up that will persist through the upcoming week. A negatively tilted upper level trof had developed over the forecast area as energy from the Pacific had topped the upstream ridge. Numerous impulses of energy throughout this upcoming week will bring showers and scattered storms as this pattern persists. The latest WPC forecast indicates over 3 inches of rain are expected through Friday night. && .AVIATION /18Z TAFS THROUGH 18Z SUNDAY/... Issued at 1208 PM EDT Sat Sep 20 2025 Isolated convection remains just west of KSBN near a north to south oriented moisture/instability axis. Chance for scattered showers and isolated thunderstorms do increase mid afternoon through early evening at KSBN as this warm front gets a push east in advance of an approaching Mid MS Valley upper trough. Conditions will remain VFR outside of any thunderstorms which could bring brief restrictions. KFWA more removed from better moisture transport/forcing with lower confidence in shower/storm coverage late this afternoon and evening. Opted to hold with a Prob30 group for now as a result. && .IWX WATCHES/WARNINGS/ADVISORIES... IN...None. OH...None. MI...None. MARINE...None. && DISCUSSION...MCD AVIATION...Steinwedel
Hazardous Weather Outlook National Weather Service Northern Indiana 340 PM EDT Sat Sep 20 2025 INZ005>009-012>015-017-018-020-022>027-032>034-103-104-116-203-204- 216-LMZ043-046-MIZ078>081-177-277-OHZ001-002-004-005-015-016-024-025- 211945- Elkhart-Lagrange-Steuben-Noble-De Kalb-Starke-Pulaski-Marshall- Fulton IN-Whitley-Allen IN-White-Cass IN-Miami-Wabash-Huntington- Wells-Adams-Grant-Blackford-Jay-Northern La Porte- Eastern St. Joseph IN-Northern Kosciusko-Southern La Porte- Western St. Joseph IN-Southern Kosciusko- New Buffalo MI to St Joseph MI-Michigan City IN to New Buffalo MI- Cass MI-St. Joseph MI-Branch-Hillsdale-Northern Berrien- Southern Berrien-Williams-Fulton OH-Defiance-Henry-Paulding-Putnam- Van Wert-Allen OH- 340 PM EDT Sat Sep 20 2025 /240 PM CDT Sat Sep 20 2025/ This Hazardous Weather Outlook is for northern Indiana, southwest Michigan, northwest Ohio and the nearshore waters of southeastern Lake Michigan. .DAY ONE...This afternoon and tonight. There are chances for thunderstorms, especially west of Interstate 69 into tonight. Locally heavy rainfall and gusty winds are possible with the stronger storms. .DAYS TWO THROUGH SEVEN...Sunday through Friday. There are chances for storms through the week, especially Sunday and Monday afternoon and evening when the stronger storms will likely be accompanied by gusty winds. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time.
The Northern Indiana radar (KIWX), 67 km away, was scanning. The volume nearest the first event began at 20:33 UTC.
1 thunderstorm wind. Local standard time, as filed.
Local media relayed a report of a few large trees and tree limbs snapped. A power line was down in the area as well.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Indiana in 2025Every state in 2025This day in weather historyWarnings in Indiana, September 2025
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: 1295409.