Meteorologists are warning people to stay cool this weekend as strong heat wave is coming to South East of United State.

The most accurate measures of European daily temperatures ever indicate that the length of heat waves on the continent has doubled and the frequency of extremely hot days has nearly tripled in the past century. The new data shows that many previous assessments of daily summer temperature change underestimated heat wave events in western Europe by approximately 30 percent.

A major heat wave continues today across Southeastern Europe after record temperatures on July 24 that killed at least 12 people in Romania.