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Polk County's Extreme Temperature Plan went into effect at 10 a.m. Friday and will remain in place until 7 a.m. Monday. Highs will be in the 90s through the weekend and heat indices are expected to hit triple-digits.A heat advisory will be in effect from 1-7 p.m. Friday for dozens of counties in western, southern and eastern Iowa, where heat index values are expected to reach 105 degrees. Due to the heat, many Polk County libraries and community centers are identified as cooling centers. Click here to find the cooling center nearest to you. The Des Moines Area Regional Transit Authority will provide free rides to cooling centers. Riders should tell bus drivers that they want to go to a cooling center when they board. Emergency shelters will also provide weather amnesty. Those include:Catholic Charities — Emergency shelter for families. Central Iowa Shelter & Services — Low-barrier emergency shelter for individuals over 18 in Polk County.Children and Families of Iowa — Safe shelter for individuals and families fleeing domestic violence.Ellipsis — Shelter and programs for youth under 18 who are involved with the child welfare or juvenile justice system.Hawthorn Hill — Operates New Directions shelter for families with children.Hope Ministries — Provides a men’s shelter called Bethel Mission and the Hope Center shelter for women and children.Iowa Homeless Youth Center — Emergency shelter beds for young people between the ages of 18 to 24. Summer safety: Never leave unattended people, pets in hot vehiclesTriple-digit heat index values Friday-Monday����vlog forecast Friday: Partly cloudy. Afternoon storm chances in northern Iowa. High 91F. Heat index values around 100. Winds S at 10 to 20 mph.Saturday: Mostly sunny skies. High 95F. Heat index values around 105. Winds S at 10 to 15 mph.Sunday: Intervals of clouds and sunshine in the morning with more clouds for later in the day. A stray shower or thunderstorm is possible. Heat index values around 105. High 94F. Winds S at 10 to 15 mph.