A series of weak, mainly convectively induced disturbances, resulted in the development of thunderstorms during the evening hours. Plenty of CAPE existed, but overall shear was weak, limiting organization.
Every event with a place to put it. Tap one for its entry below.
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 series of weak, mainly convectively induced disturbances, resulted in the development of thunderstorms during the evening hours. Plenty of CAPE existed, but overall shear was weak, limiting organization.
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 Aug 16, 5:16 PM EST, 1 hour 29 minutes earlier. Its key messages:
Area Forecast Discussion National Weather Service Northern Indiana 616 PM EDT Sat Aug 16 2025 .KEY MESSAGES... - There remains a chance (20-40%) for thunderstorms this evening or overnight. Damaging wind gusts are the primary hazard. - Remaining hot and humid with at least a slight chance of daily thunderstorms (20% chance) until at least midweek. && .DISCUSSION... Issued at 252 PM EDT Sat Aug 16 2025 All eyes are on southern and western WI this afternoon. This morning's MCS across MN and WI carries on this hour with renewed development across far southern WI and a secondary area of activity north of LaCrosse. The line segment over far southern WI, approaching Rockford, IL, continues to be outflow dominant, yet satellite representation to the right flank (storm relative) remains healthy. This conflict reduces forecast confidence for this afternoon and evening. Local conditions are unstable and moisture is adequate for thunderstorms. Thus, a trigger is the missing ingredient. The trigger to ignite storm can be either this line of storms exiting southern WI or two, the activity farther west in WI where the synoptic support is improved. In either scenario, damaging wind gusts are the primary hazard along with heavy rainfall. The difference between the two scenarios is timing by about 3 to 6 hours. I'm inclined to believe that the outflow-dominance of the line approaching Rockford will permit that activity to be somewhat short-lived, thus, the day's best chance for storms is likely delayed until sunset or midnight EDT. Monitor the forecast for updates and have multiple ways to receive watch or warning information. Given the uncertainty, the POP forecast is conservative with plenty of 20% POPs (slight chance) this afternoon through tonight with a peak near 40% (chance). Depending on how this evening and overnight evolves, our hot and humid airmass may be temporarily shunted south for Sunday allowing for a primarily dry day. Until today's round of storms comes and goes, forecast confidence in Sunday is low. Upper-level ridging with west/northwest flow continues into at least Tuesday. This pattern will allow hot and humid conditions to linger with daily thunderstorm chances. These thunderstorm chances will be highly dependent on daily mesoscale features, similar to today's murky setup. Modest upper-level support from a passing shortwave looks to enhance thunderstorm coverage Monday night. Shear continues to be a weak point per forecast guidance at only about 20-25 knots. This ridging pattern breaks down Wednesday as troughing occurs over the Northeast US. This will allow high temperatures to be closer to normal; low-80s. Dry to end the week but showers and thunderstorms are possible later in the weekend as a Canadian cold front looks to bring even cooler air to the region. && .AVIATION /18Z TAFS THROUGH 18Z SUNDAY/... Issued at 543 PM EDT Sat Aug 16 2025 Summer classic type of "pop up" storms; generally shorter lasting, little overall movement, and accompanied by locally heavy rainfall and possibly some small hail. Storms just getting going after 22Z, and it looks like better chances overnight with organized activity upstream. No major changes to TAFs, although now have included TEMPO MVFR ceilings and visibilities at SBN. && .IWX WATCHES/WARNINGS/ADVISORIES... IN...None. OH...None. MI...None. MARINE...None. && DISCUSSION...Brown AVIATION...Skipper
Hazardous Weather Outlook National Weather Service Northern Indiana 326 PM EDT Sat Aug 16 2025 INZ005>009-012>015-017-018-020-022>027-032>034-103-104-116-203-204- 216-MIZ078>081-177-277-OHZ001-002-004-005-015-016-024-025-171930- 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-Cass MI-St. Joseph MI- Branch-Hillsdale-Northern Berrien-Southern Berrien-Williams- Fulton OH-Defiance-Henry-Paulding-Putnam-Van Wert-Allen OH- 326 PM EDT Sat Aug 16 2025 /226 PM CDT Sat Aug 16 2025/ This Hazardous Weather Outlook is for northern Indiana, southwest Michigan and northwest Ohio. .DAY ONE...This afternoon and tonight. There is a chance of severe storms this evening and overnight. Damaging wind gusts are the primary hazard. .DAYS TWO THROUGH SEVEN...Sunday through Friday. There are periodic chances of thunderstorms Sunday through Wednesday. Isolated damaging wind gusts are the primary hazard. Heat indices ranging from the mid 90s to around 100 degrees are likely through Monday. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time. LMZ043-046-171930- New Buffalo MI to St Joseph MI-Michigan City IN to New Buffalo MI- 326 PM EDT Sat Aug 16 2025 This Hazardous Weather Outlook is for the nearshore waters of southeastern Lake Michigan. .DAY ONE...This afternoon and tonight. There is a chance of thunderstorms today and tonight. A few storms may produce wind gusts in excess of 40 knots. .DAYS TWO THROUGH SEVEN...Sunday through Friday. There are chances for thunderstorms this Sunday through Wednesday. A few storms may produce wind gusts in excess of 40 knots.
Special Weather Statement
National Weather Service Northern Indiana
601 PM EDT Sat Aug 16 2025
INZ015-162230-
Fulton IN-
601 PM EDT Sat Aug 16 2025
...A STRONG THUNDERSTORM WILL IMPACT WESTERN FULTON COUNTY THROUGH
630 PM EDT...
At 600 PM EDT, Doppler radar was tracking a strong thunderstorm 7
miles northwest of Rochester, moving southeast at 10 mph.
HAZARD...Wind gusts up to 40 mph and half inch hail.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Minor hail damage to vegetation is
possible.
Locations impacted include...
Rochester, Leiters Ford, Bruce Lake Station, Delong, Lake Bruce,
Nyena Lake, Tiosa, Lake Manitou, Athens, and Talma.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
&&
LAT...LON 4117 8647 4117 8608 4114 8608 4100 8614
4100 8617 4095 8617 4106 8647
TIME...MOT...LOC 2200Z 298DEG 9KT 4110 8632
MAX HAIL SIZE...0.50 IN
MAX WIND GUST...40 MPH
NWSSpecial Weather Statement
National Weather Service Northern Indiana
627 PM EDT Sat Aug 16 2025
INZ216-162245-
Southern Kosciusko IN-
627 PM EDT Sat Aug 16 2025
...A STRONG THUNDERSTORM WILL IMPACT SOUTHWESTERN KOSCIUSKO COUNTY
THROUGH 645 PM EDT...
At 626 PM EDT, Doppler radar was tracking a strong thunderstorm near
Mentone, or 10 miles northeast of Rochester, moving east at 15 mph.
HAZARD...Wind gusts up to 40 mph and pea size hail.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Minor hail damage to vegetation is
possible.
Locations impacted include...
Akron, Mentone, Silver Lake, Claypool, Burket, Beaver Dam Lake,
Packerton, Sevastopol, Beaver Dam, and Palestine.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
&&
LAT...LON 4109 8602 4108 8607 4109 8607 4117 8608
4117 8605 4120 8606 4120 8577 4104 8576
4104 8602
TIME...MOT...LOC 2226Z 275DEG 13KT 4113 8602
MAX HAIL SIZE...0.25 IN
MAX WIND GUST...40 MPH
NWSSpecial Weather Statement
National Weather Service Northern Indiana
636 PM EDT Sat Aug 16 2025
INZ015-162300-
Fulton IN-
636 PM EDT Sat Aug 16 2025
...A STRONG THUNDERSTORM WILL IMPACT NORTHWESTERN FULTON COUNTY
THROUGH 700 PM EDT...
At 633 PM EDT, Doppler radar was tracking a strong thunderstorm
11 miles northwest of Rochester, moving east at 15 mph.
HAZARD...Wind gusts up to 50 mph and penny size hail.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Minor hail damage to vegetation is
possible.
Locations impacted include...
Leiters Ford and Delong.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
Torrential rainfall is also occurring with this storm and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.
&&
LAT...LON 4117 8647 4117 8621 4106 8625 4108 8647
TIME...MOT...LOC 2233Z 275DEG 12KT 4114 8639
MAX HAIL SIZE...0.75 IN
MAX WIND GUST...50 MPH
NWSSpecial Weather Statement
National Weather Service Northern Indiana
647 PM EDT Sat Aug 16 2025
INZ017-018-162315-
Whitley IN-Allen IN-
647 PM EDT Sat Aug 16 2025
...A STRONG THUNDERSTORM WILL IMPACT NORTHWESTERN ALLEN AND
NORTHEASTERN WHITLEY COUNTIES THROUGH 715 PM EDT...
At 646 PM EDT, Doppler radar was tracking a strong thunderstorm near
Churubusco, or near Tri-lakes, moving east at 15 mph.
HAZARD...Wind gusts up to 40 mph and half inch hail.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Minor hail damage to vegetation is
possible.
Locations impacted include...
Churubusco, Lake Everett, and Collins.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
&&
LAT...LON 4115 8544 4123 8543 4125 8523 4111 8524
TIME...MOT...LOC 2246Z 275DEG 12KT 4119 8538
MAX HAIL SIZE...0.50 IN
MAX WIND GUST...40 MPH
NWSSpecial Weather Statement
National Weather Service Northern Indiana
655 PM EDT Sat Aug 16 2025
INZ022-162330-
Cass IN-
655 PM EDT Sat Aug 16 2025
...A STRONG THUNDERSTORM WILL IMPACT NORTHEASTERN CASS COUNTY THROUGH
730 PM EDT...
At 655 PM EDT, Doppler radar was tracking a strong thunderstorm near
Logansport, moving east at 15 mph.
HAZARD...Wind gusts up to 40 mph and pea size hail.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Minor hail damage to vegetation is
possible.
Locations impacted include...
Logansport, Twelve Mile, Metea, Hoover, New Waverly, Leases Corner,
Adamsboro, and Lucerne.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
&&
LAT...LON 4076 8646 4089 8645 4091 8617 4073 8617
TIME...MOT...LOC 2255Z 275DEG 12KT 4083 8636
MAX HAIL SIZE...0.25 IN
MAX WIND GUST...40 MPH
NWSSpecial Weather Statement
National Weather Service Northern Indiana
728 PM EDT Sat Aug 16 2025
INZ020-022-170000-
Cass IN-White IN-
728 PM EDT Sat Aug 16 2025
...STRONG THUNDERSTORMS WILL IMPACT NORTHERN WHITE AND NORTHERN CASS
COUNTIES THROUGH 800 PM EDT...
At 728 PM EDT, Doppler radar was tracking strong thunderstorms along
a line extending from Monon to Logansport. Movement was east at 15
mph.
HAZARD...Wind gusts up to 40 mph and pea size hail.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Minor hail damage to vegetation is
possible.
Locations impacted include...
Logansport, Monticello, Monon, Royal Center, Reynolds, Burnettsville,
Leases Corner, Headlee, Lee, Indiana Beach, Metea, Norway, Idaville,
Sitka, Adamsboro, Lucerne, Bell Center, Buffalo, Lake Cicott, and
Anoka.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
Torrential rainfall is also occurring with these storms and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.
&&
LAT...LON 4091 8625 4069 8625 4072 8652 4074 8653
4074 8671 4076 8696 4084 8699 4091 8699
TIME...MOT...LOC 2328Z 275DEG 11KT 4086 8686 4077 8636
MAX HAIL SIZE...0.25 IN
MAX WIND GUST...40 MPH
NWSThe Northern Indiana radar (KIWX), 92 km away, was scanning. The volume nearest the first event began at 23:46 UTC.
3 thunderstorm wind, 1 hail, 1 lightning. Local standard time, as filed.
Large tree limb fell onto a vehicle and is blocking the road. No injuries were reported.
Emergency management officials reported a large tree limb snapped and across the road. In addition, a tree adjacent to a road was uprooted, with some damage to the road.
Public report.
The public reported a total of 26 large trees were damaged in various fashions on a one acre lot.
Lightning strike caused tree to fall into the road, blocking it.
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, August 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: 1274241, 1274243, 1274239, 1284052, 1274240.