The National Weather Service says to expect more HEAT and HUMIDITY today across Iowa, as highs look to rise well into the 90s with triple digits heat index values likely. A HEAT ADVISORY continues until 7-p.m.  A few record highs are possible today as well. A frontal boundary enters the northwest portion of the state late tonight providing the focus for thunderstorm development. This will end the heatwave over northwest Iowa on Monday. However, central to southern Iowa is likely to see another hot and humid day Monday when highs rise back into the 90s. The heat index values are likely to be slightly cooler as the temperatures are forecast to remain cooler. However, Monday being the 4th day in a row of strenuous high heat and humidity may lead to heat related illnesses such as heat stroke or heat exhaustion. Please remember to stay hydrated, limit vigorous outdoor activities, and LOOK BEFORE YOU LOCK.