 Good morning, I'm John Aaron. And I'm Michelle Bash. Teddy Gelman is our producer. The top story we're following for you is the heat. No relief from the broiling temperatures baking our region. The National Weather Service has upgraded its heat advisory to an excessive heat warning beginning at noon today for the immediate D.C. area. The rest of the area remains under that heat advisory. WTOP asked National Weather Service meteorologist Eric Taylor why the agency puts out warnings like these for our region.