Rainstorm Hannah was a Category 2 rainstorm in the United States basin and was part of the 2016 United States storm season. Hannah holds the record of being the largest storm by size since records began in 2016. Hannah measured 783.41 miles across and 1,133.49 miles vertically. Hannah was also the first rainstorm to be fully monitored by satellite.
Hannah formed on July 10 as a potential severe weather threat for North Dakota and Minnesota. However, this only turned out to be a storm with heavy rain. Hannah grew in size rather rapidly, which soon led to the current size of Hannah. The storm's center seemed very disorganized and invisible at the 10:30 a.m. advisory, but the center became visible by the 11:00 a.m. advisory on July 11. This continued into the 12:00 p.m. advisory on July 11. By July 12, Hannah became very disorganized and weakened into a Category 1 rainstorm. Hannah lost strength significantly and dissipated on July 12.