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Tropical Cyclones ReportNovember 2011
North Indian Basin
 Tropical Storm Keila Satellite Image |
 Tropical Storm Keila Forecast Track  Saffir-Simpson Scale Color Legend |
| Tropical Cyclone | Keila | ||||||||
| Cyclogenesis Date | 11/02 | ||||||||
| Cyclolysis Date | 11/02 | ||||||||
| Highest Saffir-Simpson Category | TS | ||||||||
| Maximum 6-hr Sustained Wind | 40 mph (35 kt or 65 km/h) | ||||||||
| Min Pressure | 996 mbar | ||||||||
| Accumulated Cyclone Energy (ACE*) Index (kt2) | .3675 x 104 | ||||||||
| Landfall Information (date, location and sustained winds) | N/A | ||||||||
| Deaths | 14 | ||||||||
| *The (ACE) Index calculations are based on preliminary data. | |||||||||
 Tropical Storm Five Satellite Image |
 Tropical Storm Five Forecast Track Saffir-Simpson Scale Color Legend |
| Tropical Cyclone | Five | ||||||||
| Cyclogenesis Date | 11/26 | ||||||||
| Cyclolysis Date | 11/30 | ||||||||
| Highest Saffir-Simpson Category | TS | ||||||||
| Maximum 6-hr Sustained Wind | 40 mph (35 kt or 65 km/h) | ||||||||
| Min Pressure | 998 mbar | ||||||||
| Accumulated Cyclone Energy (ACE*) Index (kt2) | 1.8375 x 104 | ||||||||
| Landfall Information (date, location and sustained winds) | N/A | ||||||||
| Deaths | 19 | ||||||||
| *The (ACE) Index calculations are based on preliminary data. | |||||||||
Atlantic Basin
During the first week of November, an extratropical low pressure system departed the coast of South Carolina and settled several hundred miles southwest of Bermuda. On November 8, the disturbance attained gale-force winds of 45 mph (75 km/h); however, due to the presence of a cold core, the cyclone was named Subtropical Storm Sean. Upon disassociating from its parent upper-level low, the storm was declared fully tropical hours later. Tracking northeast, its center passed within 80 miles (180 km) of Bermuda, then continued out to sea. By November 12, the storm had transitioned to extratropical and was absorbed by a cold front in the northern Atlantic. Overall storm impacts included precipitation amounts of less than 1 inch (25.4 mm) in Bermuda as well as one storm surge-related drowning near Florida’s east coast. On average, a named storm forms in the Atlantic basin in November once every other year.
 Tropical Storm Sean Satellite Image |
 Tropical Storm Sean Forecast Track Saffir-Simpson Scale Color Legend |
| Tropical Cyclone | Sean | ||||||||
| Cyclogenesis Date | 11/08 | ||||||||
| Cyclolysis Date | 11/12 | ||||||||
| Highest Saffir-Simpson Category | TS | ||||||||
| Maximum 6-hr Sustained Wind | 63 mph (55 kt or 102 km/h) | ||||||||
| Min Pressure | 983 mbar | ||||||||
| Accumulated Cyclone Energy (ACE*) Index (kt2) | 3.7225 x 104 | ||||||||
| Landfall Information (date, location and sustained winds) | N/A | ||||||||
| Deaths | 0 | ||||||||
| *The (ACE) Index calculations are based on preliminary data. | |||||||||
East North Pacific Basin
A rarity, both for its late-season (November 1 or later) occurrence and its affiliation with wave-like motions other than African tropical waves, Kenneth formed as a tropical depression on November 18. Benefiting from unseasonably low wind shear and unseasonably warm ocean temperatures of 27 degrees C (80.6 degrees F), the storm rapidly intensified to a Category 1 and Category 2 hurricane on November 21. Near dawn on the following day, Kenneth became a Category 4 hurricane with winds of 145 mph (230 km/h) – its peak intensity. As it traversed colder waters, the storm downgraded to tropical storm strength less than 24 hours later. It tracked westward out to sea for the length of its lifespan posing no threat to land areas. By November 25, Kenneth weakened to a remnant low and was later absorbed by a stationary system near the eastern border of the Central Pacific. On average, a hurricane forms during November in the Eastern Pacific basin once every 10 years. Kenneth is not only the latest occurring major hurricane since the start of the satellite era (1971), but also the strongest late-season tropical cyclone on record in the Eastern Pacific.
 Tropical Storm Kenneth Satellite Image |
 Tropical Storm Kenneth Forecast Track Saffir-Simpson Scale Color Legend |
| Tropical Cyclone | Kenneth | ||||||||
| Cyclogenesis Date | 11/20 | ||||||||
| Cyclolysis Date | 11/25 | ||||||||
| Highest Saffir-Simpson Category | Cat 4 | ||||||||
| Maximum 6-hr Sustained Wind | 144 mph (125 kt or 232 km/h) | ||||||||
| Min Pressure | 943 mbar | ||||||||
| Accumulated Cyclone Energy (ACE*) Index (kt2) | 11.0225 x 104 | ||||||||
| Landfall Information (date, location and sustained winds) | |||||||||
| Deaths | 0 | ||||||||
| *The (ACE) Index calculations are based on preliminary data. | |||||||||
