A Status Yellow high temperature warning has been issued for 14 counties as temperatures are expected to reach as high as 28C. Met Éireann has issued the warning for all of Leinster and Co.Tipperary, with the alert coming into effect at 6am on Wednesday. Status Yellow High Temperature warning for Leinster, Tipperary. Met Éireann has warned of an increased risk of heat stress and water safety issues as more people are expected to visit beaches, lakes and rivers. A Status Yellow high temperature warning has been issued for 14 counties.