2011 North Indian cyclone season
Apr–Jun · Oct–Dec · Season ended
The 2011 North Indian cyclone season produced 7 named storms, 1 at hurricane strength and 0 major storms, against a 1991–2020 average of 6.3, 2.0 and 1.0. Its accumulated cyclone energy was 11, 47% of the average.
2011 season at a glance
- Named storms: 7 (1991–2020 average 6.3).
- Hurricane strength (64 kt+): 1 (average 2.0).
- Major, 96 kt+: 0 (average 1.0).
- Accumulated cyclone energy: 11.1, 47% of the 24 average.
- Named-storm days: 10.5, counting each six-hourly fix at 34 kt or more as a quarter day.
- First named storm: Tropical Storm 1A, June 11.
- First storm at hurricane strength: Thane, December 28.
- Last storm to dissipate: Thane, December 30.
- All systems tracked: 10, including 3 that stayed below tropical-storm strength.
Counts use 1-minute best-track winds: named storms reached 34 kt (39 mph), the next column 64 kt (74 mph) and major storms 96 kt (111 mph). Regional agencies here use 10-minute winds (3-minute in India), so their official counts can differ.
Every storm of the 2011 season
| Storm | Dates | Peak | Min pressure | Landfall |
|---|---|---|---|---|
| Unnamed | – | TD | 1002 mb | — |
| TD 1A | – | TS | 996 mb | — |
| Unnamed | – | TS | 978 mb | — |
| Unnamed | – | TD | 990 mb | — |
| Unnamed | – | TD | 995 mb | — |
| TD 2B | – | TS | 996 mb | Cox’s Bāzār, Bangladesh |
| Keila | – | TS | 982 mb | Şalālah, Oman |
| TD 4A | – | TS | 996 mb | — |
| TD 5B | – | TS | 996 mb | — |
| Thane | – | C2 | 956 mb | Neyveli, India |
- Unnamed: This system formed in the North Indian in February 2011 and peaked as a tropical depression with maximum sustained winds of 35 mph (55 km/h) and a minimum pressure of 1002 mb. It did not make landfall. The system was tracked for 1 day.
- TD 1A: This system formed in the North Indian in June 2011 and peaked as a tropical storm with maximum sustained winds of 40 mph (65 km/h) and a minimum pressure of 996 mb. It did not make landfall. The system was tracked for 3 days.
- Unnamed: This system formed in the North Indian in June 2011 and peaked as a tropical storm with maximum sustained winds of 45 mph (75 km/h) and a minimum pressure of 978 mb. It did not make landfall. The system was tracked for 7 days.
- Unnamed: This system formed in the North Indian in July 2011 and peaked as a tropical depression with maximum sustained winds of 30 mph (45 km/h) and a minimum pressure of 990 mb. It did not make landfall. The system was tracked for 1 day.
- Unnamed: This system formed in the North Indian in September 2011 and peaked as a tropical depression with maximum sustained winds of 5 mph (10 km/h) and a minimum pressure of 995 mb. It did not make landfall. The system was tracked for 1 day.
- TD 2B: This system formed in the North Indian in October 2011 and peaked as a tropical storm with maximum sustained winds of 40 mph (65 km/h) and a minimum pressure of 996 mb. It made landfall near Cox’s Bāzār, Bangladesh. The system was tracked for 3 days.
- Keila: Keila formed in the North Indian in October 2011 and peaked as a tropical storm with maximum sustained winds of 65 mph (100 km/h) and a minimum pressure of 982 mb. It made 2 landfalls, first near Şalālah, Oman and last near Al Ghayz̧ah, Yemen. The system was tracked for 7 days.
- TD 4A: This system formed in the North Indian in November 2011 and peaked as a tropical storm with maximum sustained winds of 40 mph (65 km/h) and a minimum pressure of 996 mb. It did not make landfall. The system was tracked for 5 days.
- TD 5B: This system formed in the North Indian in November 2011 and peaked as a tropical storm with maximum sustained winds of 40 mph (65 km/h) and a minimum pressure of 996 mb. It did not make landfall. The system was tracked for 6 days.
- Thane: Thane formed in the North Indian in December 2011 and peaked as a Category 2 cyclone with maximum sustained winds of 105 mph (165 km/h) and a minimum pressure of 956 mb. It made landfall near Neyveli, India. The system was tracked for 5 days.
Each summary is built from the storm’s best track.
Strongest storm of 2011
Cyclone Thane was the strongest storm of the season, peaking at 105 mph (165 km/h), with a lowest pressure of 956 mb, on December 29. That is Category 2 strength on the Saffir-Simpson scale.
37 North Indian storms since 1980 peaked higher, and 2 matched it. It produced 67% of the season’s accumulated cyclone energy.
Landfalls in 2011
3 of the season’s 10 systems made landfall, none of them at hurricane strength. Each landfall point is listed with the nearest town and the wind at that moment.
How 2011 ranks since 1980
The season ranks 12th of 47 North Indian seasons since 1980 for named storms (tied with 6 other seasons), 23rd for hurricane strength (tied with 15 other seasons) and 36th for accumulated cyclone energy.
The record since 1980 is 11 named storms, in 1998, and the highest ACE is 85, in 2019.
2011 storm names
The 2011 season used 2 names: Keila, Thane.
8 systems were tracked without a name and are listed by number.
2011 season FAQ
How many named storms were there in 2011?
The 2011 North Indian cyclone season had 7 named storms, 1 at hurricane strength and 0 major storms, from 10 systems tracked in all. The 1991–2020 average is 6.3 named storms, 2.0 at 64 kt or more and 1.0 major per season. The first to form was Tropical Storm 1A and the last was Thane.
What was the strongest storm of 2011?
Cyclone Thane. It peaked at 105 mph (165 km/h, 90 kt) with a lowest pressure of 956 mb on December 29. That is Category 2 strength on the Saffir-Simpson scale. 37 North Indian storms since 1980 peaked higher. It produced 67% of the season’s accumulated cyclone energy.
When did the 2011 season end?
The North Indian Ocean has no official season, so the 2011 season is the calendar year: every storm that formed by December 31 counts. The last system, Thane, dissipated on December 30. Since 1980, 31 North Indian storms reached tropical-storm strength in December.