Indianapolis could have dangerous heat index at 102 this week. See the forecast (2024)

Thunderstorms — some possibly severe with damaging winds — will sweep across Central Indiana early this week followed by the potential for dangerous heat, according to local meteorologists with theNational Weather Service, who advise Hoosiers to pay careful attention to the weather.

By Thursday, forecasters say rainy conditions will give way to peak afternoon heat indices that could reach 102 in Indianapolis and 106 in Bloomington. Meanwhile, Terre Haute and Vincennes could see temperatures with heat indices around 105, NWS said.

Here's what we know.

NWS issues special weather statement for July 30 - Aug 1, 2024

NWS issued a special weather statement Tuesday urging Hoosiers to plan ahead by limiting outdoor activities.

"Peak afternoon heat index values will approach or exceed 100 degrees across portions of central Indiana today through Thursday, though uncertainty exists due to potential for storms," Meteorologists with NWS said Tuesday on social media.

Heat indices could climb to 105-degree range, per NWS

"We're expecting a few more rounds of thunderstorms over the course of the week and then things really start to heat up when we get to Wednesday and Thursday," said Andrew White, a meteorologist with the NWS in Central Indiana.

White told IndyStar multiple rounds of thunderstorms near Vincennes will likely push northwest, then heat indices could get into the 105-degree range toward the end of the week. He advised Hoosiers to stay in contact with friends and family who might be particularly vulnerable to hotter weather.

"With the heat coming up, it's a good time to check in on your neighbors, especially those who may be more sensitive to it," White said. "Stay inside and drink plenty of water."

What are the symptoms of heat exhaustion?

Symptoms of heat exhaustion include the following signs:

  • Dizziness orfainting
  • Excessive sweating
  • Cool, pale and clammy skin
  • Nausea or vomiting
  • Rapid, weak pulse
  • Muscle cramps

Experts say if you or someone else is experiencing heat exhaustion to drink cool water, seekair-conditioning, takea cool shower or usea cold compress to alleviate symptoms.

Indianapolis could have dangerous heat index at 102 this week. See the forecast (1)

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Live weather radar for Central Indiana

Indianapolis could have dangerous heat index at 102 this week. See the forecast (2)

Weather forecast for Central Indiana, per NWS

☁️ Tuesday: Patchy fog before 9 a.m. Otherwise, mostly cloudy, then gradually becoming sunny, with a high near 89. West wind 3 to 7 mph.

🌜 Tuesday night: Scattered showers and thunderstorms, mainly after 2 a.m. Partly cloudy, with a low around 71. South southwest wind 3 to 5 mph. Chance of precipitation is 30%.

⛈️ Wednesday: Scattered showers and thunderstorms. Mostly sunny, with a high near 89. South southwest wind 5 to 8 mph. Chance of precipitation is 50%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

☁️ Wednesday night: A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 73. South southwest wind around 6 mph.

⛈️ Thursday: A 50 percent chance of showers and thunderstorms. Mostly sunny and hot, with a high near 92. South southwest wind 6 to 10 mph. New rainfall amounts between a tenth and a quarter of an inch, except higher amounts possible in thunderstorms.

⛈️ Thursday night: Showers and thunderstorms likely before 2 a.m., then showers likely and possibly a thunderstorm after 2 a.m. Mostly cloudy, with a low around 72. West southwest wind 5 to 7 mph. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.

🌤️ Friday: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 2 p.m. Partly sunny, with a high near 85. West wind 6 to 9 mph. Chance of precipitation is 70%.

⛈️ Friday night: Showers likely and possibly a thunderstorm before 8 p.m., then a slight chance of showers and thunderstorms between 8 p.m. and 2 a.m. Partly cloudy, with a low around 68. Northwest wind 5 to 7 mph. Chance of precipitation is 60%.

🌤️ Saturday: A 30 percent chance of showers and thunderstorms, mainly after 2 p.m. Mostly sunny, with a high near 85. North wind 6 to 8 mph.

🌜 Saturday night: A 30 percent chance of showers before 8 p.m. Mostly clear, with a low around 67. North wind 3 to 7 mph.

☀️ Sunday: Sunny, with a high near 87.

🌜 Sunday night: Mostly clear, with a low around 65.

How to stay safe during hot weather

Older Hoosiers and young children, experts warn, are the most at risk during periods of extreme heat. Here's what they recommend doing to stay safe:

The American Red Cross

  • Stay hydrated and avoid sugary, caffeinated and alcoholic drinks.
  • Electric fans may not provide relief, instead take a cooling shower or bath and find an air-conditioned space.

The National Weather Service

  • Reduce, eliminate or reschedule strenuous outdoor activities.
  • Eat light, cool, easy-to-digest foods like fruits or salad.

Centers for Disease Control and Prevention

  • Choose lightweight, loose-fitting clothes.
  • Head to a public library or other space with air conditioning.

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John Tuftscovers trending news for IndyStar and Midwest Connect. Send him a news tip atJTufts@Gannett.com. Follow him on Twitter atJTuftsReports.

Indianapolis could have dangerous heat index at 102 this week. See the forecast (2024)

FAQs

At what point is the heat index dangerous? ›

What is the heat index?
ClassificationHeat IndexEffect on the body
Danger103°F - 124°FHeat cramps or heat exhaustion likely, and heat stroke possible with prolonged exposure and/or physical activity
Extreme Danger125°F or higherHeat stroke highly likely
2 more rows

What is a heat index of 102? ›

Heat Index
Heat IndexPossible heat disorders for people in higher risk groups
90-105Sunstroke, heat cramps and heat exhaustion possible with prolonged exposure and/or physical activity.
105-130Sunstroke, heat cramps or heat exhaustion likely, and heat stroke possible with prolonged exposure and/or physical activity.
2 more rows

How hot is too hot for humans? ›

The human body can't tolerate its temperature reaching 43 degrees C (about 109.4 degrees F). “Anyone who reaches that core temperature — 99.9% would die,” Vanos said. This is the upper limit of survival. Heat often kills in more subtle ways — by worsening pre-existing issues, like cardiovascular or renal disease.

Is 105 heat index dangerous? ›

When the heat index reaches 105° F, or higher, conditions can become dangerous for both people and pets. Another tool for indication of potential heat stress is called Wet Bulb Glob Temperature. It factors several parameters, including temperature, humidity, cloud cover and wind.

What is the highest temperature a human can survive outside? ›

Externally, the upper limit of the human body's thermoneutral zone—the ambient temperature range in which the body can maintain effectively maintain its temperature and equilibrium—likely falls somewhere between 104 and 122 degrees Fahrenheit, according to a 2021 study published in Physiology Report.

What temperature is too hot to walk outside? ›

Generally, when the heat index is over 90°F, you should use extreme caution when heading outdoors for activity or intense exercise. Keep in mind that different people might have a different threshold, so it's important to pay attention to your body.

How long can you be outside in 100 degree weather? ›

Yes, but you don't want to be out there for very long. If you are out there for more than an hour, you could get over heated, have a heat stroke and it would make you very sick and could possibly die. If you are active I would say be out there for about 30 to 45 minutes.

What is a fatal heat index? ›

A sustained wet-bulb temperature of about 35 °C (95 °F) can be fatal to healthy people; at this temperature our bodies switch from shedding heat to the environment, to gaining heat from it. Thus a wet bulb temperature of 35 °C (95 °F) is the threshold beyond which the body is no longer able to adequately cool itself.

What temperature is unbearable? ›

If the wet-bulb temperature exceeds 35°C (95°F) for more than six hours, the average person's body will be unable to cool itself off by evaporating sweat and maintain a stable core body temperature. This can result in organ failure and brain damage if the situation is not improved.

What states have the highest heat index? ›

  • South Carolina. ...
  • Alabama. ...
  • Georgia. ...
  • Mississippi. ...
  • Louisiana. Statewide Average Maximum Temperature in 2023: 80.2 degrees. ...
  • Texas. Statewide Average Maximum Temperature in 2023: 80.5 degrees. ...
  • Florida. Statewide Average Maximum Temperature in 2023: 83.4 degrees. ...
  • Hawaii. Statewide Average Maximum Temperature in 2023: 83.6 degrees.
Jun 20, 2024

What temperature is an OSHA violation? ›

The OSHA-NIOSH Heat Safety Tool App is a resource for finding the forecasted and current heat index near your location. The Heat App indicates the hazard levels using the HI as: Caution less than 80°F HI; • Warning 80°F to 94°F HI; and, • Danger at 95°F HI or higher.

What temperature can you refuse to work in the US? ›

OSHA does not set specific temperatures at which workers can refuse to work. However, workers have the right to refuse work that they believe poses an imminent danger of death or serious harm, including unsafe heat conditions.

Is 106 degree weather dangerous? ›

If the outside temperature is between 90 and 105 F, it can cause heat cramps. If between 105 and 130 F, heat exhaustion can occur. If above 130 F, it can cause heat stroke.

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