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[Lady Cop]

(CNN) -- A heat wave is building and could reach dangerous levels in parts of the Midwest, the Plains and the Southeast this week.

Fifteen states are under heat advisories, which means temperatures are expected to exceed 105 degrees Fahrenheit.

Kansas City and St. Louis in Missouri are under an excessive heat warning, along with Tulsa, Oklahoma; Memphis, Tennessee; and Evansville, Indiana. In these areas, the heat index, or how hot the body feels due to the combined effects of heat and humidity, will reach between 110 and 115 degrees this week.

The advisories and warnings will remain in effect until at least Tuesday.