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Subtropical Depression Twenty-two was the second Subtropical Depression in the extremely active, 2005 Atlantic hurricane season. The first being the early stages of Unnamed Subtropical Storm. The extratropical remnants of Subtropical Depression Twenty-two caused severe flooding in New England, along with the remains of Tropical Storm Tammy. Twenty-two was initially a threat to Bermuda, however, Twenty-two bypassed Bermuda with little affect. Subtropical Depression Twenty-two killed 10 people because of the flooding in New England.
During the first week of October, a large mid/upper level trough persisted. On October 5 a low formed within the trough. It is estimated that the low became a subtropical storm on October 8 as it developed a closed circulation. The association with the surface and upper-level lows plus the cold air gave it subtropical characteristics, rather than tropical characteristics. Twenty-two soon reached it peak intensity as a strong subtropical depression with a minimum pressure of 1008. It soon weakened as wind shear increased and as deep convection began to diminish. The subtropical depression decayed into a remnant low and soon the low intensified. It was classified as extratropical on October 11. The extratropical low intensified and a minimum pressure of 1005 was recorded, while winds were at 40 knots. By October 15 it was absorbed by another extratropical low. 
The extratropical storm from former Subtropical Depression Twenty-two and Tropical Storm Tammy contributed to the Northeast U.S. flooding of October 2005. This flooding caused ten fatalities in the United States. In New Jersey, the flooding was described by some as the "worst since Hurricane Floyd". Some places in New Jersey received more than 11 inches of rainfall.  Damage in the United States was estimated at around $29.5 million USD.
- ↑ Jack Beven (January 16, 2006). "Subtropical Depression Twenty-Two Tropical Cyclone Report". http://www.nhc.noaa.gov/pdf/TCR-AL232005_Twenty-two.pdf. Retrieved December 14, 2009.
- ↑ wcbstv.com - New Jersey Flooding Gets Much Worse