Marcus’ 5 a.m. Tuesday forecast INDIANAPOLIS (WISH) — Central Indiana braces for more showers and storms today, with isolated flooding possible. Heatwave to follow midweek with temperatures nearing 90°F. A cold front may bring late-night thunderstorms Thursday, followed by cooler, drier con ditions. Today: More Showers and Storms, Flooding Possible The same sluggish system that has been producing on-and-off storms across Central Indiana for several days now lingers in the vicinity today, keeping scattered shower and thunderstorm chances in the forecast. Locally heavy rainfall rates remain a concern, and isolated flooding is possible, particularly in areas that have already absorbed significant rain over the past week. Coverage will be isolated to scattered rather than widespread, but any storm that does develop could produce a quick inch or more in a short period. Tonight: A few downpours, muggy temperatures There’s enough juice in the atmosphere to support thunderstorm development overnight into early Wednesday. Severe weather won’t be a concern, but isolated flooding could be an issue as storms will be slow moving and could form over the same locations for lengthy periods of time. Wednesday and Thursday: Dangerous Heat Once the overnight storm potential clears, the focus shifts to a significant heat for midweek. Renewed warm air surging northward from the Gulf will send temperatures into the upper 80s to near 90° on both Wednesday and Thursday — potentially Indianapolis’s hottest readings of 2026. The heat index is the bigger concern: dew points climbing into the low 70s will push the feels-like temperature to near 100° at times during peak afternoon heating. Overnight lows will only drop into the low-to-mid 70s — offering little recovery between hot days. That continuous heat stress elevates the risk for heat-related illness, particularly for those without air conditioning, the elderly, young children, and anyone working or exercising outdoors. Thursday Night: Cold Front Arrives A cold front approaching from the northwest Thursday night offers the next chance for thunderstorms — but the timing may actually work in the region’s favor. The SPC has the region in a level 2 risk for severe storms – however – because storms will likely be in a weakening state with the loss of daytime heating, the main concern may be wind driven for the overnight hours. More significant severe weather is likely to our northwest during the afternoon hours of Thursday. Friday Through the Weekend: Cooler and Drier Once the front clears Friday morning, a noticeably more comfortable air mass settles in — highs near 80°, overnight lows near 60° — through the weekend and into early next week. Rain chances will be much lower, although a few showers could be possible late Sunday into Monday. Temps look cooler heading into much of next week. ...read more read less