Scattered thunderstorms produced heavy rain and localized flooding across northwest Indiana during the late evening of June 8th into the early morning of June 9th.
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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 LOT wrote it up.
Scattered thunderstorms produced heavy rain and localized flooding across northwest Indiana during the late evening of June 8th into the early morning of June 9th.
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 Chicago, IL wrote its last area forecast discussion before the first event at Jun 8, 5:37 PM CST, 5 hours 38 minutes earlier. Its key messages:
Area Forecast Discussion National Weather Service Chicago/Romeoville, IL 637 PM CDT Mon Jun 8 2026 .KEY MESSAGES... - Heavy showers and embedded thunderstorms will move through the area this afternoon into early evening. Torrential downpours will be possible and may lead instances of flash flooding. - Tonight will be damp with isolated showers and drizzle. - Tuesday through Thursday will be noticeably warmer and more humid with daily heat indices in the 90s. - Several rounds of severe thunderstorms may occur in the general region Tuesday night through Thursday. - Temperatures will trend cooler Friday onward, along with lower humidity. && .DISCUSSION... Issued at 242 PM CDT Mon Jun 8 2026 Through Tuesday Night: Early this afternoon, water vapor imagery showcases a midlevel shortwave perturbation spinning over far eastern IA. A plume of heavy showers with embedded thunderstorms recently exited the area to the northeast after leaving behind anywhere from a half an inch to an inch of rain around parts of the CWA this morning. The heavy rain rates and lowered visibilities were made possible by a deeply saturated, generally warm profile with PWATS of nearly 2". The forcing was provided by a northward progressing warm front which has now lifted into southern WI. In the wake of this front, we've seen a hiatus in precip coverage although dewpoints continue to climb, now largely getting into the middle 70s pushing PWATs above that 2" mark. Additional storms are now entering the CWA from the southwest as of around 2 PM, driven by a vort lobe/secondary warm frontal feature lifting through IL extending east from the low center. Heavy rain rates have been observed across central IL recently, a couple as high as three to four inches per hour. This plume will continue advancing northward through northern IL and northwest IN through the afternoon, and we expect the heavy rain rates to continue as it does with torrential downpours and flash flooding our biggest concerns with this afternoon activity. Forecast soundings for this afternoon are very reminiscent of a tropical environment exhibiting very weak deep layer shear and 1,500 to 2,000 Joules of tall, skinny CAPE. The weak shear should make it difficult for storms to organize all that well and greatly limits the overall severe potential, but is supportive of water-loaded updrafts and furthers concerns for localized flooding. These concerns prompted us to issue a Hydrologic Outlook our IL counties to highlight the flash flood potential. With impacts looking more likely on a localized basis vs more widespread, opted to hold off on issuing a Flood Watch, but near-term trends will continue to be monitored closely for any reconsideration. Wet downdrafts will also be possible and strong, likely non-damaging wind gusts are on the table. Finally, strong low level vorticity extending from the low and some low level shear could lead to the development of some funnel clouds, particularly in our south and west. An SPS was recently issued for these areas for the possibility of funnel clouds. This main plume and the flood concerns should push out of the CWA during the early evening as the vort lobe does. The low center will scoot from far NW IL across southern WI tonight into tomorrow. Forcing and instability will wane after dusk, but plenty of low-mid level moisture and transient forcing will be present to keep chances for isolated to widely scattered showers going through the night. With the sheared out low still working across the region, lighter rain or drizzle could remain into Tuesday morning with mostly cloudy skies likely to start the day. A warmer air mass out over the Plains will be allowed to translate east into the Midwest behind this current wave. Afternoon highs are forecast to push into the middle and upper 80s, including up to the lakefront. Dewpoints still hanging out in the lower 70s will result afternoon heat indices into the lower 90s. We'll destabilize nicely during the day, however a big lack of forcing should inhibit most convection and largely dry conditions are anticipated. A storm system developing off the lee of the Rockies today will mature through tomorrow and is expected to track northeastward into the middle of the week. As the eastern edge of the upper trough moves over the region, an EML will spread east into our region late. Guidance favors an MCS forming well out to our west during the day on Tuesday and continue into the night on the nose of the nocturnal LLJ. Most camps steer this system to our north and leave us largely dry or with only isolated activity during the night, but some (namely the Euro) bring storms across our CWA late tomorrow night into early Wednesday as a warm front may stall in the area. If storms were to occur, damaging winds and potentially some hail would be the biggest concerns. Wednesday and Wednesday Night: Any lingering thunderstorms at daybreak Wednesday should end by mid-morning as low-level capping increases at the base of the EML plume and the low-level jet weakens. A largely dry day will then set the stage for temperatures to warm to the upper 80s to lower 90s (heat indices in the mid to upper 90s). Wednesday evening, an upper-level shortwave embedded in the aggregate troughing will lift into the Upper Mississippi River Valley leading to the development of severe thunderstorms across Minnesota and Wisconsin. A separate region of thunderstorm development may take place in central and eastern Iowa tied to a secondary, more subtle, 500mb wave. Assuming this occurs, convection may try to continue eastward across the Mississippi River and across northern Illinois/northwestern Indiana during the evening and overnight hours. However, do wonder if thunderstorms would tend to struggle into northern Illinois given (1) the upper-level jet and associated region of deep- layer shear will be displaced northwest of our area and (2) the terminus of the low-level jet will be focused into Wisconsin. With that said, any development of a deep cold pool would sustain a threat for outflow-driven convection well into the nighttime hours given an expansive reservoir of instability across the region. In all, will watch the Wednesday night timeframe for a threat for severe weather in the general region. Thursday: The forecast for Thursday carries quite a bit of uncertainty. In the wake of the lead shortwave responsible for thunderstorms Wednesday evening, a few individual models are hinting at a trailing subtle secondary wave moving through the central Plains during the overnight hours into early Thursday morning. In such a scenario, initial elevated convection in the Nebraska/Kansas/Iowa region may evolve into a forward- propagating MCS that would be encouraged to roll toward northern Illinois after daybreak. Confidence in this scenario is rather low. Assuming there isn't an MCS rolling into the area during the morning, Thursday should be another warm and humid day with highs in the 80s and heat indices remaining in the 90s. A strong upper-level shortwave and associated cold front is then expected to swing into the Midwest during the afternoon and evening hours. This time frame looks to be the most concerning for an episode of severe weather in our local area with an overlap of strong low-and deep-layer shear, steep mid-level lapse rates, and moisture-laden instability profiles. A mix of supercells and bowing segments certainly seems realistic with a threat for all hazards. Friday Onward: In the wake of the cold front, Friday and Saturday should be noticeably cooler and less humid. Ensemble mean highs from the EPS and GEFS range from the upper 70s to lower 80s with overnight lows in the mid to upper 60s. Am quite confused as to why NBM guidance putting chances for showers and thunderstorms in the forecast for our area Friday night into Saturday given a large surface high pressure system will be moving through the area in the wake of the cold frontal passage. Ensemble guidance supports temperatures trending below average (highs in the low to mid 70s) and a return of rain chances next week as aggregate troughing develops over the northern United States in some fashion. Doom/Borchardt && .AVIATION /00Z TAFS THROUGH 06Z WEDNESDAY/... Issued at 637 PM CDT Mon Jun 8 2026 Forecast concerns include... Chance of thunderstorms this evening. Ifr/lifr cigs overnight into Tuesday morning. Possible northeast wind shift/lake breeze Tuesday evening. There will be another chance of thunderstorms this evening for all of the terminals, though low confidence for coverage. Showers have recently developed across northwest IL and near RFD with additional showers and a few thunderstorms across southwest and central IL. This activity is expected to move northeast through the evening and have added prob thunder for this potential. Additional showers are possible overnight but there remains uncertainty for how widespread this activity will become. Mvfr cigs will be possible this evening, especially across northwest IL. Cigs are expected to quickly lower through ifr late this evening into the overnight hours and possibly into lifr overnight, which would then continue past sunrise, slowly lift Tuesday morning, eventually lifting to low vfr midday/early Tuesday afternoon. While widespread fog is not expected tonight, some vis reductions are possible. South/southeast winds may gust into the 15-20kt range through sunset this evening and then remain southeast into the overnight hours. Winds will shift southwest around or just after daybreak and then turn more to the west/southwest through the morning Tuesday. Some of the guidance is showing a lake breeze developing Tuesday afternoon, moving inland and reaching ORD/MDW by early Tuesday evening. cms && .LOT WATCHES/WARNINGS/ADVISORIES... IL...None. IN...None. LM...None. && Visit us at weather.gov/chicago
Hazardous Weather Outlook...UPDATED National Weather Service Chicago/Romeoville IL 840 PM CDT Mon Jun 8 2026 ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-002- 010-011-019-100145- 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- 840 PM CDT Mon Jun 8 2026 /940 PM EDT Mon Jun 8 2026/ This Hazardous Weather Outlook is for portions of north central Illinois...northeast Illinois and northwest Indiana. .DAY ONE...Tonight. Weather hazards expected... Limited Thunderstorm Risk. Limited Flooding Risk. DISCUSSION... Scattered showers and isolated thunderstorms will continue tonight. Heavy rain and localized flooding are the main threats. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday. Tuesday night through Thursday... Limited to Elevated Flooding Risk at times. Limited to Elevated Severe Thunderstorm Risk at times. DISCUSSION... Multiple rounds of thunderstorms are expected in the Tuesday night through Thursday period. Some storms may be strong to severe, especially on Thursday. .SPOTTER INFORMATION STATEMENT... Spotter activation will not be necessary through tonight. GENERAL STORM MOTION OF THE DAY: Moving toward the north at 25 mph. LMZ740>745-100145- 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- 840 PM CDT Mon Jun 8 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...Tonight. Weather hazards expected... Limited Thunderstorm Risk. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday. Tuesday night through Thursday... Limited to Elevated Severe Thunderstorm Risk at times. Wednesday and Thursday... Hazardous conditions for small craft are likely. Visit us at www.weather.gov/chicago
The Chicago radar (KLOT), 61 km away, was scanning. The volume nearest the first event began at 05:18 UTC.
1 flash flood. Local standard time, as filed.
Street flooding was reported in many areas in Lake County including in Lowell, Crown Point and St. John. Rainfall amounts included 3.25 inches near Schereville; 3.06 inches in St. John; 2.52 inches in Merrillville and 2.31 inches in Crown Point.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Indiana in 2026Every state in 2026This day in weather historyWarnings in Indiana, June 2026
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: 1345199.