Severe Storms and Extreme Heat Targeting Iowa Tonight
Dangerous Heat Index Values Expected in Western Iowa
Iowans need to prepare for a dangerous combination of extreme heat and severe weather Tuesday night. Forecasters are warning of triple-digit heat index values followed by the threat of damaging storms, large hail and possible tornadoes overnight.
The National Weather Service issued a Heat Advisory from 1 to 9 p.m. Tuesday for much of the region. While areas further north might be spared the worst of the triple digits, western Iowa is directly in the crosshairs. The highest heat index values are expected near the Sioux City metro area, where conditions could briefly feel as hot as 105 degrees.
Protecting Vulnerable Iowans from the Heat
Meteorologists said the heat and humidity could increase the risk of heat-related illnesses, particularly for people working outdoors or those without adequate cooling. This is a critical time to check on neighbors and family members.
Moderate to Major Heat Risk today (all areas) and Wednesday (southeast) indicates a potential for heat-related illness for those without adequate cooling and hydration. Protect yourself against the heat and check on more vulnerable individuals such as the elderly, children and those with chronic illnesses.
The heat advisory is set to expire at 9 p.m., but the weather threats are far from over.
Severe Storms Could Arrive Tuesday Evening
The weather threat is expected to shift dramatically by Tuesday evening. Conditions will become favorable for severe thunderstorms across the region, according to the Storm Prediction Center.
Forecasters expect storms to develop west of Iowa before moving east through the evening and overnight hours. The atmosphere is expected to contain abundant instability, providing fuel for strong to severe thunderstorms.
Wednesday Threat Shifts Deeper into Iowa
On Wednesday, a cold front moves through the region. The greatest severe weather threat will move directly into Iowa and the Upper Midwest. An isolated severe storm could still develop Wednesday afternoon in northwest Iowa, mainly east of a line from Ida Grove to Spencer. Large hail and damaging winds remain possible with these storms.
After the front passes, temperatures are expected to cool heading into the weekend. Additional chances for rain remain in the forecast, though widespread severe weather appears less likely. By early next week, highs in the 70s could become more common across the state, offering a welcome break from the heat.
Staying Safe During Extreme Weather
- Stay hydrated: Drink plenty of water throughout the day, even if you do not feel thirsty.
- Check on neighbors: Make sure elderly residents and those with chronic illnesses have access to cooling.
- Have a weather radio: Ensure you have a way to receive overnight storm warnings.
- Secure outdoor items: Bring in or tie down loose items that could become projectiles in high winds.