Police say the suspect walked in wearing a Grey hoodie and surgical mask holding a brown bag demanding money.
The clerk says she filled the bag and he took off.
It happened so quickly no one in the bank even knew a robbery was taking place until the clerk screamed out that they had been robbed.
This is the second time in three weeks this same bank has been robbed.
Police say there are similarities in the two robberies, but they aren't confirming if they are related.
Police say he's a white male in his mid twenties and they are still searching.