By Randi Love (Reuters) – They’re planning days around air conditioning in Oklahoma, monitoring the grid in Texas and keeping an eye out for sharks as they try to cool off in New York. Across the United States, Americans have been enduring in some cases dangerously high heat that meteorologists say will last into next week. More than 100 million people are living under excessive warnings or heat advisories this week, according to the National Weather Service. In Oklahoma City, where a high of 110 Fahrenheit (43 Celsius) was predicted Tuesday, Colin Newman, 40, said it hits like “dragon’s breat…