(Pierre, SD) — There’s a blood shortage in South Dakota right now. Donations are off the mark in the winter because of the weather and illnesses. Local hospitals are on alert to have enough transfusion supplies for health needs. According to Avera experts, it takes up to three-thousand units of blood a week to meet demands. That makes this time of year is critical for blood donations. Officials are encouraging South Dakotans to go to Life Serve Blood Center dot org to find their closest donation center.