Timeline_of_the_2018_North_Indian_Ocean_cyclone_season
The 2018 North Indian Ocean cyclone season was an above-average period of tropical cyclone formation in the Northern Indian Ocean. The season featured 14 depressions, 10 deep depressions, 7 cyclonic storms, 5 severe cyclonic storms, 4 very severe cyclonic storms, and 1 extremely severe cyclonic storm. The season has no official boundaries,[citation needed] though storms typically form between April and December, with peaks in tropical cyclone activity from May–June and in November.[1]
Quick Facts Timeline of the 2018 North Indian Ocean cyclone season, Season boundaries ...
| Timeline of the 2018 North Indian Ocean cyclone season | |||||||
|---|---|---|---|---|---|---|---|
 Season summary map | |||||||
| Season boundaries | |||||||
| First system formed | March 13, 2018 | ||||||
| Last system dissipated | December 17, 2018 | ||||||
| Strongest system | |||||||
| Name | Mekunu | ||||||
| Maximum winds | 175 km/h (110 mph) (3-minute sustained) | ||||||
| Lowest pressure | 960 hPa (mbar) | ||||||
| Longest lasting system | |||||||
| Name | Cyclone Gaja | ||||||
| Duration | 9.625 days | ||||||
| |||||||
| Other years 2016, 2017, 2018, 2019, 2020 | |||||||
Close
The India Meteorological Department (IMD) is the official Regional Specialized Meteorological Centre for the Northern Indian Ocean basin,[2] and as such, it is responsible for tracking and issuing advisories on systems in the Arabian Sea and in the Bay of Bengal.[3] If tropical cyclones in the Northern Indian Ocean reach winds of 34 kn (63 km/h; 39 mph), it is given a name from a pre-defined naming list.[4] The Joint Typhoon Warning Center (JTWC) unofficially issues advisories on systems in the Northern Indian Ocean,[5] assigning tropical cyclones a numerical identifier[6] and suffixing it with the letter A for systems in the Arabian Sra and B for systems in the Bay of Bengal.[7] The IMD measures tropical cyclone wind speeds over a 3-minute average[8] while the JTWC uses a 1-minute average.[6]
March
March 13
- 03:00 UTC at 5.0°N 76.0°E / 5.0; 76.0 – the IMD upgrades a well-marked low-pressure area in the Arabian Sea to a depression, estimating maximum 3-minute sustained winds of 45 km/h (30 mph) and a minimum central pressure of 1006 hPa (mbar; 29.71 inHg).[9]: 32–33
March 15
- 00:00 UTC – the IMD downgrades the depression to a well-marked low over Lakshadweep.[9]: 33
May
May 16
- 00:00 UTC at 12.0°N 52.7°E / 12.0; 52.7 – the JTWC upgrades a disturbance to a tropical depression, assigning it the designation 01A.[10]
- 12:00 UTC at 13.0°N 50.0°E / 13.0; 50.0 – the IMD upgrades 01A to a depression.[9]: 40, 42
- 18:00 UTC at 13.2°N 49.7°E / 13.2; 49.7 – the JTWC upgrades 01A to a tropical storm.[10]
May 17
- 00:00 UTC at 13.2°N 49.0°E / 13.2; 49.0 – the IMD upgrades 01A to a deep depression.[9]: 42
- 03:00 UTC at 13.2°N 48.7°E / 13.2; 48.7 – the IMD upgrades 01A to a cyclonic storm, assigning it the name Sagar.[9]: 40, 42
May 18
- 03:00 UTC at 12.2°N 46.3°E / 12.2; 46.3 – the IMD estimates Sagar to have peaked in intensity with maximum 3-minute sustained winds of 85 km/h (50 mph) and a minimum central pressure of 994 hPa (mbar; 29.35 inHg).[9]: 42
- 18:00 UTC at 11.2°N 45.1°E / 11.2; 45.1 – the JTWC upgrades Sagar to a Category 1-equivalent cyclone on the Saffir–Simpson scale, estimating maximum 1-minute sustained winds of 120 km/h (75 mph).[10]
May 19
- 00:00 UTC at 10.9°N 44.7°E / 10.9; 44.7 – the JTWC downgrades Sagar to a tropical storm.[10]
- between 08:00 and 09:00 UTC at 10.65°N 44.0°E / 10.65; 44.0 – Sagar makes landfall on Somalia.[9]: 42
- 18:00 UTC at 10.2°N 43.3°E / 10.2; 43.3 – the IMD downgrades Sagar to a deep depression.[9]: 42
May 20
- 00:00 UTC at 10.0°N 42.9°E / 10.0; 42.9 – the IMD downgrades Sagar to a depression.[9]: 42
- 03:00 UTC – the IMD downgrades Sagar to a well-marked low.[9]: 42
- 06:00 UTC at 9.8°N 41.8°E / 9.8; 41.8 – the JTWC downgrades Sagar to a tropical depression.[10]
May 21
- 06:00 UTC at 7.9°N 58.6°E / 7.9; 58.6 – the JTWC begins monitoring a tropical depression in the Arabian Sea, assigning it the designation 02A.[10]
- 12:00 UTC at 8.5°N 58.5°E / 8.5; 58.5 – the IMD upgrades 02A to a depression.[9]: 60
May 22
- 00:00 UTC at 9.1°N 57.5°E / 9.1; 57.5 – the JTWC upgrades 02A to a tropical storm.[10]
- 03:00 UTC at 9.2°N 57.2°E / 9.2; 57.2 – the IMD upgrades 02A to a deep depression.[9]: 60
- 12:00 UTC at 9.2°N 57.2°E / 9.2; 57.2 – the IMD upgrades 02A to a cyclonic storm, assigning it the name Mekunu.[9]: 58, 61
May 23
- 03:00 UTC at 11.2°N 55.9°E / 11.2; 55.9 – the IMD upgrades Mekunu to a severe cyclonic storm.[9]: 61
- 09:00 UTC at 11.8°N 55.9°E / 11.8; 55.9 – the IMD upgrades Mekunu to a very severe cyclonic storm.[9]: 61
- 12:00 UTC at 11.9°N 56.1°E / 11.9; 56.1 – the JTWC upgrades Mekunu to a Category 1-equivalent cyclone on the Saffir–Simpson scale.[10]
May 25
- 00:00 UTC at 15.2°N 54.7°E / 15.2; 54.7 – the JTWC upgrades Mekunu to a Category 2-equivalent cyclone on the Saffir–Simpson scale.[10]
- 03:00 UTC at 15.4°N 54.5°E / 15.4; 54.5 – the IMD upgrades Mekunu to an extremely severe cyclonic storm.[9]: 61
- 12:00 UTC at 16.4°N 54.1°E / 16.4; 54.1 – the IMD estimates Mekunu to have peaked in intensity with maximum 3-minute sustained winds of 175 km/h (110 mph) and a minimum central pressure of 960 hPa (mbar; 28.35 inHg).[9]: 61
- 12:00 UTC at 16.3°N 54.4°E / 16.3; 54.4 – the JTWC upgrades Mekunu to a Category 3-equivalent cyclone on the Saffir–Simpson scale, estimating maximum 1-minute sustained winds of 185 km/h (115 mph).[10]
- between 18:30 and 19:30 UTC at 16.85°N 53.75°E / 16.85; 53.75 – Mekunu makes landfall on Oman.[9]: 61
May 26
- 00:00 UTC at 17.2°N 53.5°E / 17.2; 53.5 – the IMD downgrades Mekunu to a very severe cyclonic storm.[9]: 61
- 00:00 UTC at 17.2°N 53.5°E / 17.2; 53.5 – the JTWC downgrades Mekunu to a Category 2-equivalent cyclone on the Saffir–Simpson scale.[10]
- 03:00 UTC at 17.4°N 53.4°E / 17.4; 53.4 – the IMD downgrades Mekunu to a severe cyclonic storm.[9]: 61
- 06:00 UTC at 17.9°N 53.3°E / 17.9; 53.3 – the JTWC downgrades Mekunu to a Category 1-equivalent cyclone on the Saffir–Simpson scale.[10]
- 09:00 UTC at 18.1°N 53.1°E / 18.1; 53.1 – the IMD downgrades Mekunu to a cyclonic storm.[9]: 61
- 12:00 UTC at 18.6°N 53.1°E / 18.6; 53.1 – the JTWC downgrades Mekunu to a tropical storm.[10]
- 18:00 UTC at 18.6°N 52.8°E / 18.6; 52.8 – the IMD downgrades Mekunu to a deep depression.[9]: 61
May 27
- 00:00 UTC at 19.0°N 52.6°E / 19.0; 52.6 – the IMD downgrades Mekunu to a depression.[9]: 61
- 03:00 UTC – the IMD downgrades Mekunu to a well-marked low.[9]: 61
- 06:00 UTC at 19.0°N 52.0°E / 19.0; 52.0 – the JTWC downgrades Mekunu to a tropical depression.[10]
May 28
- 06:00 UTC at 16.5°N 90.2°E / 16.5; 90.2 – the JTWC upgrades a disturbance in the Bay of Bengal to a tropical depression, assigning it the designation 03B.[10]
- 18:00 UTC at 17.8°N 91.5°E / 17.8; 91.5 – the JTWC downgrades 03B to a tropical wave.[10]
May 29
- 00:00 UTC at 18.3°N 92.0°E / 18.3; 92.0 – the JTWC upgrades 03B to a tropical storm.[10]
- 06:00 UTC at 18.5°N 92.2°E / 18.5; 92.2 – the IMD upgrades 03B to a depression.[9]: 81
- 12:00 UTC at 19.2°N 93.0°E / 19.2; 93.0 – the IMD estimates 03B to have peaked in intensity with maximum 3-minute sustained winds of 55 km/h (35 mph) and a minimum central pressure of 992 hPa (mbar; 29.29 inHg).[9]: 81
- 12:00 UTC at 19.5°N 93.5°E / 19.5; 93.5 – the JTWC estimates 03B to have peaked in intensity with maximum 1-minute sustained winds of 85 km/h (50 mph).[10]
- between 17:00 and 18:00 UTC – 03B makes landfall north of Kyaukphyu.[9]: 81
- 18:00 UTC at 19.8°N 93.7°E / 19.8; 93.7 – the IMD upgrades 03B to a deep depression.[9]: 81
May 30
- 00:00 UTC at 21.3°N 95.7°E / 21.3; 95.7 – the JTWC downgrades 03B to a tropical depression.[10]
- 03:00 UTC at 21.8°N 95.8°E / 21.8; 95.8 – the IMD downgrades 03B to a depression.[9]: 81
- 06:00 UTC – the IMD downgrades 03B to a well-marked low.[9]: 81
June
June 10
- 06:00 UTC at 22.3°N 91.5°E / 22.3; 91.5 – the IMD upgrades a well-marked low in the Bay of Bengal to a depression.[9]: 87–88
- 12:00 UTC at 22.7°N 91.4°E / 22.7; 91.4 – the IMD estimates the depression to have peaked in intensity with maximum 3-minute sustained winds of 45 km/h (30 mph) and a minimum central pressure of 988 hPa (mbar; 29.18 inHg).[9]: 88
- 15:00 UTC at 23.1°N 91.2°E / 23.1; 91.2 – the depression makes landfall on Feni.[9]: 88
June 11
- 00:00 UTC – the IMD downgrades the depression to a well-marked low.[9]: 88
July
July 21
- 03:00 UTC at 21.0°N 88.0°E / 21.0; 88.0 – the IMD upgrades a well-marked low in the Bay of Bengal to a depression.[9]: 93, 95
- 09:00 UTC at 21.5°N 87.6°E / 21.5; 87.6 – the IMD upgrades the system to a deep depression, estimating maximum 3-minute sustained winds of 55 km/h (35 mph) and a minimum central pressure of 988 hPa (mbar; 29.18 inHg).[9]: 95
- between 11:00 and 12:00 UTC – the system makes landfall south of Digha.[9]: 95
- 18:00 UTC at 22.0°N 87.0°E / 22.0; 87.0 – the IMD downgrades the system to a depression.[9]: 95
July 23
- 00:00 UTC – the IMD downgrades the system to a well-marked low.[9]: 95
August
August 7
- 09:00 UTC at 21.5°N 87.5°E / 21.5; 87.5 – the IMD upgrades a well-marked low in the Bay of Bengal to a depression, estimating maximum 3-minute sustained winds of 45 km/h (30 mph) and a minimum central pressure of 992 Hpa (mbar; 29.29 inHg).[9]: 102–103
- between 14:30 and 16:30 UTC – the depression makes landfall close to Balasore.[9]: 103
August 8
- 03:00 UTC – the IMD downgrades the depression to a well-marked low.[9]: 103
August 15
- 03:00 UTC at 20.0°N 86.0°E / 20.0; 86.0 – the IMD upgrades a well-marked low in the Bay of Bengal to a depression, estimating maximum sustained 3-minute winds of 45 km/h (30 mph) and a minimum central pressure of 993 Hpa (mbar; 29.32 inHg).[9]: 112–113
August 17
- 03:00 UTC – the IMD downgrades the depression to a well-marked low.[9]: 113
September
September 6
- 00:00 UTC at 21.8°N 88.0°E / 21.8; 88.0 – the IMD upgrades a well-marked low in the Bay of Bengal to a depression.[9]: 121, 123
- 03:00 UTC at 21.8°N 87.9°E / 21.8; 87.9 – the IMD upgrades the system to a deep depression, estimating maximum 3-minute sustained winds of 55 km/h (35 mph).[9]: 123
- between 04:30 and 05:30 UTC – the system makes landfall close to Digha.[9]: 123
September 7
- 00:00 UTC at 22.2°N 84.0°E / 22.2; 84.0 – the IMD downgrades the system to a depression.[9]: 123
- 06:00 UTC – the IMD downgrades the system to a well-marked low.[9]: 123
September 19
- 15:00 UTC at 17.2°N 89.0°E / 17.2; 89.0 – the IMD upgrades a well-marked low in the Bay of Bengal to a depression.[9]: 131, 133
- 18:00 UTC at 16.9°N 87.4°E / 16.9; 87.4 – the JTWC upgrades the system to a tropical depression, assigning it the designation 04B and estimating maximum 1-minute sustained winds of 65 km/h (40 mph).[10]
September 20
- 03:00 UTC at 17.5°N 87.0°E / 17.5; 87.0 – the IMD upgrades 04B to a deep depression.[9]: 133
- 12:00 UTC at 18.2°N 86.4°E / 18.2; 86.4 – the JTWC upgrades 04B to a tropical storm.[10]
- 15:00 UTC at 18.7°N 85.6°E / 18.7; 85.6 – the IMD upgrades 04B to a cyclonic storm, assigning it the name Daye and estimating maximum 3-minute sustained winds of 65 km/h (40 mph) and a minimum central pressure of 992 Hpa (mbar; 29.29 inHg).[9]: 133
- between 19:00 and 20:00 UTC at 19.27°N 84.92°E / 19.27; 84.92 – Daye makes landfall on Gopalpur.[9]: 133
September 21
- 00:00 UTC at 20.0°N 83.7°E / 20.0; 83.7 – the IMD downgrades Daye to a deep depression.[9]: 133
- 06:00 UTC at 19.8°N 81.7°E / 19.8; 81.7 – the JTWC downgrades Daye to a tropical depression.[10]
- 12:00 UTC at 21.4°N 80.2°E / 21.4; 80.2 – the IMD downgrades Daye to a depression.[9]: 133
September 22
- 12:00 UTC – the IMD downgrades Daye to a well-marked low.[9]: 133
October
October 6
- 06:00 UTC at 11.0°N 67.1°E / 11.0; 67.1 – the JTWC upgrades a disturbance in the Arabian Sea to a tropical depression, assigning it the designation 04A.[10]
- 09:00 UTC at 11.2°N 67.0°E / 11.2; 67.0 – the IMD upgrades 05A to a depression.[9]: 152
October 7
- 09:00 UTC at 12.0°N 64.8°E / 12.0; 64.8 – the IMD upgrades 05A to a deep depression.[9]: 152
- 18:00 UTC at 11.8°N 63.4°E / 11.8; 63.4 – the JTWC upgrades 05A to a tropical storm.[10]
October 8
- 00:00 UTC at 12.3°N 62.4°E / 12.3; 62.4 – the IMD upgrades 05A to a cyclonic storm, assigning it the name Luban.[9]: 152
- 03:00 UTC at 14.0°N 88.8°E / 14.0; 88.8 – the IMD upgrades a well-marked low in the Bay of Bengal to a depression.[9]: 180, 182
- 06:00 UTC at 14.2°N 88.0°E / 14.2; 88.0 – the JTWC upgrades the system to a tropical depression, assigning it the designation 06B.[10]
- 18:00 UTC at 14.5°N 87.6°E / 14.5; 87.6 – the IMD upgrades 06B to a deep depression.[9]: 182
October 9
- 00:00 UTC at 14.6°N 87.1°E / 14.6; 87.1 – the JTWC upgrades 06B to a tropical storm.[10]
- 06:00 UTC at 14.8°N 86.7°E / 14.8; 86.7 – the IMD upgrades 06B to a cyclonic storm, assigning it the name Titli.[9]: 182
- 09:00 UTC at 13.2°N 60.0°E / 13.2; 60.0 – the IMD upgrades Luban to a severe cyclonic storm.[9]: 152
- 18:00 UTC at 13.7°N 59.8°E / 13.7; 59.8 – the JTWC upgrades Luban to a Category 1-equivalent cyclone on the Saffir–Simpson scale.[10]
- 21:00 UTC at 15.7°N 85.8°E / 15.7; 85.8 – the IMD upgrades Titli to a severe cyclonic storm.[9]: 182
October 10
- 00:00 UTC at 14.1°N 59.0°E / 14.1; 59.0 – the IMD upgrades Luban to a very severe cyclonic storm.[9]: 152
- 00:00 UTC at 16.1°N 86.2°E / 16.1; 86.2 – the JTWC upgrades Titli to a Category 1-equivalent cyclone on the Saffir–Simpson scale.[10]
- 06:00 UTC at 14.2°N 58.9°E / 14.2; 58.9 – the IMD estimates Luban to have peaked in intensity with maximum 3-minute sustained winds of 140 km/h (85 mph) and a minimum central pressure of 978 hPa (mbar; 28.88 inHg).[9]: 152
- 06:00 UTC at 17.0°N 85.6°E / 17.0; 85.6 – the IMD upgrades Titli to a very severe cyclonic storm.[9]: 182
- 12:00 UTC at 14.4°N 58.6°E / 14.4; 58.6 – the JTWC upgrades Luban to a Category 2-equivalent cyclone on the Saffir–Simpson scale, estimating maximum 1-minute sustained winds of 155 km/h (100 mph).[10]
- 12:00 UTC at 17.5°N 85.3°E / 17.5; 85.3 – the IMD estimates Titli to have peaked in intensity with maximum 3-minute sustained winds of 150 km/h (90 mph) and a minimum central pressure of 970 hPa (mbar; 28.64 inHg).[9]: 182
- 12:00 UTC at 17.6°N 85.3°E / 17.6; 85.3 – the JTWC upgrades Titli to a Category 2-equivalent cyclone on the Saffir–Simpson scale.[10]
- 18:00 UTC at 18.3°N 84.8°E / 18.3; 84.8 – the JTWC upgrades Titli to a Category 3-equivalent cyclone on the Saffir–Simpson scale, estimating maximum 1-minute sustained winds of 195 km/h (120 mph).[10]
- between 23:00 UTC and 00:00 UTC October 11 at 18.8°N 84.5°E / 18.8; 84.5 – Titli makes landfall on Andhra Pradesh.[9]: 182
October 11
- 00:00 UTC at 14.4°N 58.2°E / 14.4; 58.2 – the JTWC downgrades Luban to a Category 1-equivalent cyclone on the Saffir–Simpson scale.[10]
- 06:00 UTC at 19.3°N 83.8°E / 19.3; 83.8 – the IMD downgrades Titli to a severe cyclonic storm.[9]: 183
- 06:00 UTC at 19.0°N 83.9°E / 19.0; 83.9 – the JTWC downgrades Titli to a Category 1-equivalent cyclone on the Saffir–Simpson scale.[10]
- 12:00 UTC at 14.5°N 57.9°E / 14.5; 57.9 – the JTWC downgrades Luban to a tropical storm.[10]
- 12:00 UTC at 19.9°N 83.7°E / 19.9; 83.7 – the IMD downgrades Titli to a cyclonic storm.[9]: 183
- 18:00 UTC at 20.3°N 84.3°E / 20.3; 84.3 – the IMD downgrades Titli to a deep depression.[9]: 183
- 18:00 UTC at 19.9°N 84.1°E / 19.9; 84.1 – the JTWC downgrades Titli to a tropical storm.[10]
October 12
- 03:00 UTC at 14.7°N 57.4°E / 14.7; 57.4 – the IMD downgrades Luban to a severe cyclonic storm.[9]: 153
- 06:00 UTC at 21.3°N 85.5°E / 21.3; 85.5 – the JTWC downgrades Titli to a tropical depression.[10]
- 09:00 UTC at 20.9°N 85.5°E / 20.9; 85.5 – the IMD downgrades Titli to a depression.[9]: 183
- 18:00 UTC at 14.8°N 56.6°E / 14.8; 56.6 – the IMD downgrades Luban to a cyclonic storm.[9]: 153
October 13
- 00:00 UTC at 20.9°N 85.5°E / 20.9; 85.5 – the IMD downgrades Titli to a well-marked low.[9]: 183
October 14
- between 05:30 and 06:00 UTC at 15.8°N 52.2°E / 15.8; 52.2 – Luban makes landfall on Oman.[9]: 153
- 09:00 UTC at 15.9°N 51.7°E / 15.9; 51.7 – the IMD downgrades Luban to a deep depression.[9]: 153
- 12:00 UTC at 16.2°N 51.6°E / 16.2; 51.6 – the JTWC downgrades Luban to a tropical depression.[10]
- 18:00 UTC at 16.2°N 50.7°E / 16.2; 50.7 – the IMD downgrades Luban to a depression.[9]: 153
October 15
- 03:00 UTC – the IMD downgrades Luban to a well-marked low.[9]: 153
November
November 10
- 03:00 UTC at 11.7°N 92.5°E / 11.7; 92.5 – the IMD upgrades a well-marked low in the Bay of Bengal to a depression.[9]: 206, 209
- 12:00 UTC at 12.6°N 90.8°E / 12.6; 90.8 – the IMD upgrades the system to a deep depression.[9]: 209
- 18:00 UTC at 13.2°N 89.7°E / 13.2; 89.7 – the JTWC upgrades the system to a tropical storm, assigning it the designation 07B.[10]
November 11
- 00:00 UTC at 13.4°N 89.3°E / 13.4; 89.3 – the IMD upgrades 07B to a cyclonic storm, assigning it the name Gaja.[9]: 209
November 12
- 12:00 UTC at 12.9°N 87.8°E / 12.9; 87.8 – the JTWC downgrades Gaja to a tropical depression.[10]
November 13
- 18:00 UTC at 13.4°N 85.8°E / 13.4; 85.8 – the JTWC upgrades Gaja to a tropical storm.[10]
November 15
- 03:00 UTC at 11.3°N 82.6°E / 11.3; 82.6 – the IMD upgrades Gaja to a severe cyclonic storm.[9]: 210
- 06:00 UTC at 11.3°N 82.3°E / 11.3; 82.3 – the JTWC upgrades Gaja to a Category 1-equivalent cyclone on the Saffir–Simpson scale.[10]
- 15:00 UTC at 10.6°N 80.7°E / 10.6; 80.7 – the IMD upgrades Gaja to a very severe cyclonic storm.[9]: 210
- 18:00 UTC at 10.5°N 80.3°E / 10.5; 80.3 – the IMD estimates Gaja to have peaked in intensity with maximum 3-minute sustained winds of 130 km/h (80 mph) and a minimum central pressure of 976 hPa (mbar; 28.82 inHg).[9]: 210
- 18:00 UTC at 10.6°N 80.2°E / 10.6; 80.2 – the JTWC estimates Gaja to have peaked in intensity with maximum 1-minute sustained winds of 150 km/h (90 mph).[10]
- between 19:00 and 21:00 UTC at 10.45°N 79.8°E / 10.45; 79.8 – Gaja makes landfall between Nagapattinam and Vedaranyam.[9]: 210
November 16
- 00:00 UTC at 10.4°N 79.2°E / 10.4; 79.2 – the IMD downgrades Gaja to a severe cyclonic storm.[9]: 210
- 03:00 UTC at 10.4°N 78.5°E / 10.4; 78.5 – the IMD downgrades Gaja to a cyclonic storm.[9]: 210
- 06:00 UTC at 10.5°N 77.6°E / 10.5; 77.6 – the IMD downgrades Gaja to a deep depression.[9]: 210
- 06:00 UTC at 10.4°N 77.7°E / 10.4; 77.7 – the JTWC downgrades Gaja to a tropical storm.[10]
- 12:00 UTC at 10.1°N 76.4°E / 10.1; 76.4 – the IMD downgrades Gaja to a depression.[9]: 210
November 17
- 00:00 UTC at 9.8°N 74.3°E / 9.8; 74.3 – the IMD upgrades Gaja to a deep depression.[9]: 210
November 18
- 00:00 UTC at 10.5°N 70.0°E / 10.5; 70.0 – the JTWC downgrades Gaja to a tropical depression.[10]
- 12:00 UTC at 10.5°N 68.4°E / 10.5; 68.4 – the JTWC downgrades Gaja to a disturbance.[10]
November 19
- 06:00 UTC at 11.2°N 65.8°E / 11.2; 65.8 – the IMD downgrades Gaja to a depression.[9]: 211
- 18:00 UTC – the IMD downgrades Gaja to a well-marked low.[9]: 211
December
December 13
- 00:00 UTC at 6.5°N 88.7°E / 6.5; 88.7 – the IMD upgrades a well-marked low in the Bay of Bengal to a depression.[9]: 244, 246
- 12:00 UTC at 6.9°N 88.9°E / 6.9; 88.9 – the JTWC upgrades the system to a tropical depression, assigning it the designation 07B.[10]
- 18:00 UTC at 7.6°N 88.0°E / 7.6; 88.0 – the IMD upgrades 07B to a deep depression.[9]: 244
December 15
- 06:00 UTC at 9.7°N 85.4°E / 9.7; 85.4 – the JTWC upgrades 07B to a tropical storm.[10]
- 12:00 UTC at 10.3°N 84.9°E / 10.3; 84.9 – the IMD upgrades 07B to a cyclonic storm, assigning it the name Phethai.[9]: 244
December 16
- 09:00 UTC at 12.6°N 83.6°E / 12.6; 83.6 – the IMD upgrades Phethai to a severe cyclonic storm.[9]: 244
- 12:00 UTC at 13.3°N 83.0°E / 13.3; 83.0 – the IMD estimates Phethai to have peaked in intensity with maximum 3-minute sustained winds of 100 km/h (65 mph) and a minimum central pressure of 992 hPa (mbar; 29.29 inHg).[9]: 245
- 12:00 UTC at 13.4°N 83.1°E / 13.4; 83.1 – the JTWC estimates Phethai to have peaked in intensity with maximum 1-minute sustained winds of 100 km/h (65 mph).[10]
December 17
- 03:00 UTC at 15.8°N 82.2°E / 15.8; 82.2 – the IMD downgrades Phethai to a cyclonic storm.[9]: 245
- between 08:00 and 09:00 UTC at 16.55°N 82.25°E / 16.55; 82.25 – Phethai makes landfall south of Yanam.[9]: 245
- 12:00 UTC at 16.9°N 82.4°E / 16.9; 82.4 – the IMD downgrades Phethai to a deep depression.[9]: 245
- 12:00 UTC at 16.8°N 82.5°E / 16.8; 82.5 – the JTWC downgrades Phethai to a tropical depression.[10]
- between 14:00 and 15:00 UTC – Phethai makes landfall near Tuni.[9]: 245
- 18:00 UTC at 17.5°N 82.5°E / 17.5; 82.5 – the IMD downgrades Phethai to a depression.[9]: 245
December 18
- 00:00 UTC – the IMD downgrades Phethai to a well-marked low.[9]: 245
- Kruk, Michael C. (September 1, 2019). "State of the Climate in 2018". North Indian Ocean Basin. Bulletin of the American Meteorological Society. 100 (9). American Meteorological Society: S127–S128. doi:10.1175/2019BAMSStateoftheClimate.1. hdl:10669/80308.
- "Worldwide Tropical Cyclone Centers". National Hurricane Center. Miami, Florida. Retrieved August 24, 2021.
- "Activities of RSMC, New Delhi". India Meteorological Department. Retrieved August 24, 2021.
- Tropical Cyclone Operational Plan for the Bay of Bengal and the Arabian Sea: 2020 (Report). Geneva, Switzerland: World Meteorological Organization. 2020. p. 12. Retrieved August 24, 2021.
- "Products and Services Notice". Joint Typhoon Warning Center. Pearl Harbor, Florida. Retrieved August 24, 2021.
- "Frequently Asked Questions". Joint Typhoon Warning Center. Pearl Harbor, Florida. Retrieved August 24, 2021.
- "North Indian Ocean Best Track Data". Joint Typhoon Warning Center. Pearl Harbor, Florida. Retrieved August 24, 2021.
- Mohapatra, Mrutyunjay; et al., eds. (2016). WMO/ESCAP Panel on Tropical Cyclones Annual Review 2016 (PDF) (Report). World Meteorological Organization, United Nations Economic and Social Commission for Asia and the Pacific. p. ix. Retrieved August 25, 2021 – via India Meteorological Department.
- Report on Cyclonic Disturbances over North Indian Ocean During 2018 (PDF) (Report). New Delhi: India Meteorological Department. July 2019. Retrieved August 23, 2021.
- "2018 North Indian Ocean Best Track Data". Joint Typhoon Warning Center. Pearl Harbor, Hawaii. Retrieved August 23, 2021.