The American Red Cross is rallying donors amid a severe blood shortage across the country.The Red Cross says it has seen a 35% decrease in the available blood supply over the last month.Winter weather has impacted 400 blood driv es across the country. Adding to the strain, a severe flu season has reduced the number of available donors.Brian Szabelski with the American Red Cross of Colorado and Wyoming said without immediate action, patients could face delays in lifesaving care. The American Red Cross is facing a severe blood shortage across the countryWhen we have low blood supply, hospitals have to decide who gets blood products, and that affects cancer patients, sickle cell patients, and people who have been involved in trauma, like car accidents, Szabelski said.The Red Cross is concerned that more intense winter weather expected in the coming weeks could delay blood donations when every unit of blood can make a difference.The shortage is particularly impacting the supply of types O, A negative, and B negative blood.As a thank you to donors, those who give through Jan. 25 will be entered for a chance to win a trip for two to the Super Bowl.Those who give between Jan. 26 and Feb. 28 will receive a $20 e-gift card.To donate, book an appointment by visiting RedCrossBlood.org or calling 1-800-RED CROSS (1-800-733-2767).Heres a list of upcoming blood donation opportunities in the Denver Metro: American Red Cross, 444 N. Sherman St., Denver Every Monday and Friday in January and February, 9 a.m. to 2 p.m. East Community Center, 5933 S. Fairfield St., Littleton Jan. 22, 9 a.m. to 2 p.m. Manual High School, 1700 E. 28th Ave., Denver Jan. 23, 8 a.m. to 1 p.m. RK Industries Henderson, 8221 E. 96th Ave., Henderson Jan. 23, 9 a.m. to 2 p.m. Back Office by Buyers Edge Platform, 1101 W. Mineral Ave., Littleton Jan. 26, 9 a.m. to 2 p.m. Courtyard Park Meadows, 8320 S. Valley Highway, Englewood Jan. 27, 8:30 a.m. to 1 30 p.m. University Park United Methodist Church, 2180 S University Blvd., Denver Jan. 27, 9 a.m. to 2 p.m. City of Commerce City, 7190 Colorado Blvd., Commerce City Jan. 29, 9 a.m. to 2 p.m. Porsche Littleton, 5500 S. Broadway, Littleton Feb. 3, 9 a.m. to 2 p.m. St. Paul's Episcopal Church, 9200 W. 10th Ave., Lakewood Feb. 3, 9 a.m. to 2 p.m. Rocky Mountain Regional VAMC, 1700 N. Wheeling St., Aurora Feb. 3, 11 a.m. to 4 p.m. ...read more read less