Minnesota is bracing for severe storms followed by a dangerous heat wave over the weekend. An Extreme Heat Watch is in effect for many counties, with temperatures possibly reaching near 100 degrees in some areas. Residents should prepare for high humidity and heat indexes that could put stress on health care facilities. Late-night storms are expected tonight into Friday morning, paving the way for sweltering conditions ahead. Authorities are advising people to stay cool and be aware of the extreme weather forecast as the summer season starts.