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GREENSBORO, N.C. -- The American Red Cross says they are in need of donors to replenish their blood supply.

The organization says the shortage is due to severe weather during February, which caused 20 blood drives to be canceled in the Triad area. This resulted in a shortfall of about 800 units.

Nationwide, the Red Cross says the ongoing winter storms and freezing temperatures have had a brutal impact on their ability to collect blood so far this year. Severe weather has cancelled more than 1,000 blood drives in 34 states and Washington, D.C. since the beginning of 2014.

On average, the Red Cross says they must collect about 15,000 units of blood every day for patients at approximately 2,700 hospitals and transfusion centers across the country. All blood types are currently needed to ensure a sufficient blood supply is available for patients.

To donate blood, call 1-800-RED CROSS (1-800-733-2767) or visit the Red Cross website to make an appointment or for more information.