All 99 of Iowa's counties are under a Heat Advisory on Wednesday as heat indices are expected to reach as high as 107*.

The National Weather Service in Des Moines says:

Drink plenty of fluids, stay in an air-conditioned room, stay out
of the sun, and check up on relatives and neighbors. Young
children and pets should never be left unattended in vehicles
under any circumstances.

Take extra precautions if you work or spend time outside. When
possible reschedule strenuous activities to early morning or
evening. Know the signs and symptoms of heat exhaustion and heat
stroke. Wear lightweight and loose fitting clothing when


Wednesday appears to be the peak of this latest heatwave, but will it break any records?

The all-time high temperature for July 28 in Waterloo is 103* set in 1916. As a matter of fact, only ONE day in the entire month of July does not have a high temp below 100*. It has never been warmer than 98* on July 3 in Waterloo, which was the temperature on that date in 2012.

As of Tuesday afternoon, the National Weather Service in Des Moines is forecasting a high of 99* in Waterloo on 7/28. If Waterloo does indeed reach triple digits on Wednesday, it would be the first time since 2012 that the city had more than one day reach that threshold. On June 17 Waterloo hit 100*. In 2012 Waterloo had five days reach at least 100*.

For Cedar Rapids, the record high for July 28 is 100* set in 1955. The forecast on Wednesday calls for a high of 96*. Cedar Rapids hasn’t reached at least 100* since 2013.

The National Weather Service in Des Moines issues an average of four Heat Advisories per year for its 51 county coverage area (since 2005), which includes Waterloo. There have been four issued so far in 2021. The National Weather Service in the Quad Cities – which covers Cedar Rapids – has issued three Heat Advisories so far this year.

Iowa Environmental Mesonet
Iowa Environmental Mesonet

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