Ozone and Heat Advisories Issued
The Minnesota Pollution Control Agency says temperatures in the 90s Friday along with higher humidity could cause health complications for those susceptible. Agency officials say even people who are otherwise healthy may experience health effects by the increased ozone levels.
The affected area includes the Twin Cities metro, Rochester, Mankato, Marshall, St. Cloud and Detroit Lakes.
Ozone concentrations are expected to drop when thunderstorms move in Friday night, but could rise again Saturday.
The National Weather Service has also issued a heat advisory for Friday.