Indiana Weather Outlook: Severe Thunderstorms Expected Wednesday; Heat Index to Soar to 105°F by Saturday

HEAT INDEX
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Indianapolis, IN – Central Indiana is bracing for a significant round of storms on Wednesday. Strong to severe thunderstorms could bring heavy rain, lightning, and the potential for localized flooding to the region. Residents should prepare for possible disruptions throughout the day and into Wednesday night.

According to the National Weather Service in Indianapolis, the primary window for severe weather is Wednesday afternoon into Wednesday night, when all severe hazards are possible. Forecasters warn that damaging winds could impact travel along major corridors like I-70 and I-65. These conditions are serious enough that volunteer storm spotter networks may be activated.

The weather outlook includes Marion, Hamilton, Hendricks, and Johnson counties. Ahead of the storms, residents should secure loose outdoor items like patio furniture and trash cans. Wind gusts could reach up to 22 mph, capable of turning unsecured objects into projectiles. Having a reliable method for receiving weather alerts is critical.

This storm system should move through the area before the Juneteenth holiday on Thursday. The forecast shows improving conditions, with mostly sunny skies and a high near 83°F, although a stray shower remains possible before 8 a.m.

Following the storms, a major pattern shift will bring a dangerous heatwave for the weekend. Heat index values, which measure how hot it feels with humidity, could soar to between 100 and 105 degrees from Saturday through Monday. This prolonged, intense heat poses a significant health risk. Officials urge residents to stay hydrated, avoid strenuous outdoor activity, and check on elderly family members and neighbors.

Weather alerts for the midweek storms may be issued as the system approaches.

Your Indianapolis Metro Forecast

  • Tuesday: Scattered showers and thunderstorms. High: 83°F
  • Wednesday: Strong to severe thunderstorms likely. High: 85°F
  • Thursday (Juneteenth): A chance of morning showers, then mostly sunny. High: 83°F
  • Friday: Mostly sunny. High: 87°F
  • Saturday: Sunny and hot. High: 94°F
  • Sunday: Sunny and hot. High: 94°F
  • Monday: Sunny and hot with a chance of thunderstorms. High: 95°F

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