Role of Position of Pacific Subtropical High in Deciding Path of Tropical Storms
The Pacific Subtropical High (PSH) predominantly develops during the boreal summer (June–August) over the Northwest Pacific (NWP) basin, with August accounting for the highest tropical storm (TS) frequency (46.9%). This study examines the critical influence of the PSH’s position on TS trajectories a...
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MDPI AG
2025-03-01
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| Online Access: | https://www.mdpi.com/2073-4433/16/3/322 |
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| author | Ravi Shankar Pandey |
| author_facet | Ravi Shankar Pandey |
| author_sort | Ravi Shankar Pandey |
| collection | DOAJ |
| description | The Pacific Subtropical High (PSH) predominantly develops during the boreal summer (June–August) over the Northwest Pacific (NWP) basin, with August accounting for the highest tropical storm (TS) frequency (46.9%). This study examines the critical influence of the PSH’s position on TS trajectories and the consequent exposure of affected countries, utilizing four decades (1977–2016) of August TS data from the NWP. A total of 55 TSs, unaffected by other environmental factors, were analyzed. The PSH’s observed position during each TS’s turning point was delineated using a geopotential height of 500 hPa, while track sinuosity was quantified using a validated sinuosity index (SI). Three distinct TS paths were identified: an eastward PSH position leads to highly sinuous tracks, directing TSs toward Japan; a westward PSH position results in straighter tracks, steering TSs toward the South China Sea (SCS) below Taiwan; and a mid-position guides TSs toward Taiwan. These findings underscore the PSH’s pivotal role in modulating TS behavior and provide valuable insights for disaster risk management agencies to mitigate TS impacts in the NWP basin, the world’s most active TS region, responsible for one-third of global tropical cyclones. |
| format | Article |
| id | doaj-art-e73f2b61880943d69f5889a7e70aef90 |
| institution | DOAJ |
| issn | 2073-4433 |
| language | English |
| publishDate | 2025-03-01 |
| publisher | MDPI AG |
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| series | Atmosphere |
| spelling | doaj-art-e73f2b61880943d69f5889a7e70aef902025-08-20T02:42:35ZengMDPI AGAtmosphere2073-44332025-03-0116332210.3390/atmos16030322Role of Position of Pacific Subtropical High in Deciding Path of Tropical StormsRavi Shankar Pandey0Dipartimento di Fisica e Astronomia “Augusto Righi”, Alma Mater Studiorum–Università di Bologna, Viale Berti Pichat 6/2, 40127 Bologna, ItalyThe Pacific Subtropical High (PSH) predominantly develops during the boreal summer (June–August) over the Northwest Pacific (NWP) basin, with August accounting for the highest tropical storm (TS) frequency (46.9%). This study examines the critical influence of the PSH’s position on TS trajectories and the consequent exposure of affected countries, utilizing four decades (1977–2016) of August TS data from the NWP. A total of 55 TSs, unaffected by other environmental factors, were analyzed. The PSH’s observed position during each TS’s turning point was delineated using a geopotential height of 500 hPa, while track sinuosity was quantified using a validated sinuosity index (SI). Three distinct TS paths were identified: an eastward PSH position leads to highly sinuous tracks, directing TSs toward Japan; a westward PSH position results in straighter tracks, steering TSs toward the South China Sea (SCS) below Taiwan; and a mid-position guides TSs toward Taiwan. These findings underscore the PSH’s pivotal role in modulating TS behavior and provide valuable insights for disaster risk management agencies to mitigate TS impacts in the NWP basin, the world’s most active TS region, responsible for one-third of global tropical cyclones.https://www.mdpi.com/2073-4433/16/3/322tropical stormpacific subtropical highboreal summerNorthwest Pacificgeopotential heightsinuosity index |
| spellingShingle | Ravi Shankar Pandey Role of Position of Pacific Subtropical High in Deciding Path of Tropical Storms Atmosphere tropical storm pacific subtropical high boreal summer Northwest Pacific geopotential height sinuosity index |
| title | Role of Position of Pacific Subtropical High in Deciding Path of Tropical Storms |
| title_full | Role of Position of Pacific Subtropical High in Deciding Path of Tropical Storms |
| title_fullStr | Role of Position of Pacific Subtropical High in Deciding Path of Tropical Storms |
| title_full_unstemmed | Role of Position of Pacific Subtropical High in Deciding Path of Tropical Storms |
| title_short | Role of Position of Pacific Subtropical High in Deciding Path of Tropical Storms |
| title_sort | role of position of pacific subtropical high in deciding path of tropical storms |
| topic | tropical storm pacific subtropical high boreal summer Northwest Pacific geopotential height sinuosity index |
| url | https://www.mdpi.com/2073-4433/16/3/322 |
| work_keys_str_mv | AT ravishankarpandey roleofpositionofpacificsubtropicalhighindecidingpathoftropicalstorms |