Irene seen by TRMM and MODIS satellites strengthnening into Category 1 hurricane
Irene formed as a tropical storm east of the Leeward Islands on August 20, 2011. By August 22, the storm had strengthened to a Category 1 hurricane. At 2:00 p.m. Atlantic Standard Time on August 22, the U.S. National Hurricane Center (NHC) reported that Irene had