Indianapolis weather forecast expects major heat wave. See the latest

The days following the summer solstice will bring dangerous heat to central Indiana, according to the National Weather Service. Heat indices could spike into the triple digits on June 22 and June 23 as both the temperature and humidity level climb to their highest levels so far this year.

NWS meteorologist Andrew White characterized the forecast as “definitely the hottest stretch we’ve seen so far.”

Indianapolis weather forecast

The oppressive heat will come after a stormy week. Beginning on June 21, central Indiana’s temperature will measure as high as 93 degrees.

While the thermometer won’t necessarily climb much higher on June 22 and June 23, the heat index, which accounts for the level of moisture in the air, predicts it will feel close to 105 degrees. There won’t be much wind, either, making the muggy weather even more uncomfortable.

The hot spell will start to break on June 24 or June 25 as the chance for rain moves into the area.

Downtown Indianapolis will likely feel even warmer than that due to the urban heat island effect, White warned.

High temperatures can be extremely dangerous. Indy Parks and public libraries will be open to those seeking respite from the heat.

More: The first day of summer is almost here — and Indianapolis could soon hit 90 degree weather

How to stay safe during a heat wave

Older Hoosiers and young children are most at risk during extreme heat events. To stay safe and prepared, here’s what the experts suggest:

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

More: No AC? Here’s where to stay cool or swim in Indianapolis amid heat wave

What are the symptoms of heat-related illness?

The three main heat-related illnesses to be on the lookout for are heat cramps, heat exhaustion and heat stroke. If any of the following symptoms are evident on you or another person: move to a cooler area, loosen clothing and sip cool water. Seek a medical professional if any of the symptoms don’t improve within an hour.

Heat cramps may be the first sign of illness that could lead to more serious symptoms. Cramps shows up as painful muscle cramps or spasms along with heavy sweating, according to NWS. Use firm pressure on the cramping muscles and massage them gently.

Heat exhaustion will show up as heavy sweating, weakness or tiredness with cool and clammy skin. The person’s pulse may be quick but weak and they may exhibit dizziness or nausea. Immediately move the person to an air-conditioned room, loosen clothing and apply cool, wet cloth to the skin.

Heat stroke needs immediate medical attention, so call 9-1-1 or get the patient to a hospital. Heat stroke can appear as throbbing headaches, confusion, nausea, dizziness, body temperatures above 103 degrees. The patient’s skin can also appear red with a lack of sweat. This is a serious illness and delays in medical care can be fatal.

Ryan Murphy is the communities reporter for IndyStar. She can be reached at rhmurphy@indystar.com.

Karl Schneider is an IndyStar environment reporter. You can reach him at karl.schneider@indystar.com. Follow him on Twitter @karlstartswithk

IndyStar’s environmental reporting project is made possible through the generous support of the nonprofit Nina Mason Pulliam Charitable Trust.