The American Red Cross said it will give donors $20 Amazon gift cards in exchange for blood donations amidst an emergency blood shortage.

The organization's supply of blood fell more than 25 percent since July 1, it said in an announcement.

Blood shortages are particularly dangerous during this time of the year, the Red Cross said, when much of the nation is plagued by soaring temperatures. There has been a shortfall of more than 19,000 donations during the month of July, the nonprofit said. However, blood remains in high demand at hospitals nationwide.

"It's critical hospitals have both type O positive and O negative blood ready to go for patients in the most life-threatening situations," said Dr. Eric Gehrie, executive physician director for the Red Cross. "Type O is especially important for victims of accidents and other trauma who are receiving emergency treatment. Now is the time for donors of all blood types to give and ensure hospital shelves can be restocked before any impact to patient care."

To make an appointment to give blood, download the Red Cross Blood Donor app, visit RedCrossBlood.org or call 1-800-RED CROSS (1-800-733-2767). You can view all of the blood donation locations here.