Temperatures in Baltimore officially peaked at 98 degrees Wednesday. But some city blocks might have baked at temperatures as much as 10 to 15 degrees higher.
In the high heat of the afternoon, a team of researchers and volunteers crisscrossed the city in cars equipped with temperature sensors to find out just how hot it gets, and where.
The data are being used to create a detailed map of the pockets of Baltimore where an abundance of blacktop and a lack of tree cover create what are known as urban heat islands.
The National Oceanic and Atmospheric Administration, which is funding the project, hopes to duplicate it around the country...