Dangerous Heat Wave Headed for Iowa: Heat Advisory and Extreme Heat Watch in Effect This Weekend

NORTH IOWA — A dangerous and prolonged heat wave is bearing down on the state, prompting the National Weather Service to issue both a Heat Advisory and an Extreme Heat Watch for large portions of Iowa beginning this weekend.

Officials are urging residents across the state to take the threat seriously, as the combination of high temperatures and oppressive humidity could make conditions life-threatening — especially for vulnerable populations.

What’s in Effect and Where

Heat Advisory — In effect from 1 p.m. Sunday through 9 p.m. Monday for parts of northwest and west-central Iowa. A Heat Advisory is issued when heat index values are expected to reach dangerous levels that could affect those who are sensitive to heat or who spend extended time outdoors.

Extreme Heat Watch — In effect from Sunday afternoon through Tuesday evening for much of the rest of Iowa, including the north Iowa region. An Extreme Heat Watch signals that conditions are favorable for a potentially dangerous and long-lasting heat event.

How Hot Will It Get?

Heat index values — which factor in both temperature and humidity to reflect how hot it actually feels — could climb to 105° or higher in some areas. These dangerously hot and humid conditions are expected to persist for multiple days, making this more than just a one-afternoon inconvenience.

Even more concerning, forecasters warn this heat may not break quickly. The extreme heat could continue through much of next week and potentially into the Fourth of July weekend.

Why Extended Heat Is So Dangerous

A single hot day is uncomfortable. Multiple days of extreme heat can be deadly.

When temperatures remain high overnight, the human body has no opportunity to recover from the heat stress of the day. This is when heat exhaustion and heat stroke become most likely — and when the risk is highest for the elderly, young children, outdoor workers, and those without access to air conditioning.

Heat exhaustion symptoms include heavy sweating, cool and pale skin, a fast or weak pulse, nausea, muscle cramps, and fatigue.

Heat stroke is a medical emergency. Signs include a body temperature above 103°F, hot and red skin, a rapid and strong pulse, and possible unconsciousness. Call 911 immediately if you suspect someone is experiencing heat stroke.

How to Stay Safe During the Iowa Heat Wave

Health officials recommend the following precautions during the heat event:

• Drink plenty of water — Don’t wait until you’re thirsty. Stay ahead of dehydration, especially if working or spending any time outdoors.
• Stay in air conditioning as much as possible. If you don’t have AC at home, visit a public cooling center, library, or mall during peak heat hours.
• Limit outdoor activity, particularly between 11 a.m. and 4 p.m. when heat index values will be at their highest.
• Check on elderly neighbors, relatives, and anyone who may not have reliable cooling. A brief phone call or visit could save a life.
• Take frequent breaks in the shade and wear lightweight, light-colored, loose-fitting clothing if you must work or spend time outside.
• Never leave children or pets in a parked vehicle — even with the windows cracked, temperatures inside a car can reach deadly levels within minutes.

Stay Updated

This is an evolving weather situation. Watches, advisories, and warnings may be upgraded or expanded as the heat event draws closer. Residents are encouraged to monitor the latest forecasts from the National Weather Service and stay tuned to NorthIowaNow for updates throughout the week.