A red alert is in place for all of Croatia as the country continues to swelter through a heatwave, with Friday’s temperature reaching 37 degrees Celsius — a level recorded in the northeastern region of Slavonia and southern Dalmatia. And there’s been little respite in the sea. Water temperatures in some areas hit 28 degrees Celsius. The National Hydrometeorological Institute reports that Friday’s exceptionally high temperatures prompted the issuance of Croatia’s highest-level weather alert. Heat stroke is now a real risk for many people in the Mediterranean country. Its symptoms might include …