Characteristic features of Super Cyclonic Storm(Su CS),AMPHAN which crossed West Bengal-Bangladesh Coast on May 20,2020 have been analyzed based on INSAT-3 D&passive microwave(PMW)images with special emphasis on e...Characteristic features of Super Cyclonic Storm(Su CS),AMPHAN which crossed West Bengal-Bangladesh Coast on May 20,2020 have been analyzed based on INSAT-3 D&passive microwave(PMW)images with special emphasis on eye characteristics and its relationship with intensity.These satellite images/products are analyzed to determine the centre of the cyclone,its intensity and the characteristics of the eye of the cyclone.It shows the characteristic variation of intensity of Su CS with geometric and thermal characteristics of the‘eye’.Precise changes in the eye features of the cyclone can be used for very short-range forecasting of the intensity of the cyclone.展开更多
Widespread catastrophic fog episodes in polluted northern India have been attributed to tropical cyclone activity in the Bay of Bengal&Arabian Sea;however,limited studies have been conducted on the effect of tropi...Widespread catastrophic fog episodes in polluted northern India have been attributed to tropical cyclone activity in the Bay of Bengal&Arabian Sea;however,limited studies have been conducted on the effect of tropical cyclone intensity(’T’Numbers)on different fog characteristics in Indo Gangetic Basin,Northern India.In this study,different characteristics,including persistence,intensity,and areal extension,were analyzed at the Indira Gandhi International Airport,New Delhi during 1998-99,2013-14,and 2016-17.A high-intensity tropical cyclone(Severe to Very Severe Cyclonic Storm)has been found to significantly increase the persistence,intensity,and areal extension of fog by inducing strong subsidence over the IGI Airport/Indo-Gangetic Basin.This knowledge is vital for improving the short-term forecasting of fog in the IndoGangetic Basin of Northern India and will further support the Government agencies to take preventive safety measures and planning well in advance time.展开更多
The Advanced Dvorak Technique(ADT)is used by tropical cyclone prediction centres around the world to accurately evaluate the intensity of tropical cyclones(TCs)from meteorological operational satellites.The algorithm ...The Advanced Dvorak Technique(ADT)is used by tropical cyclone prediction centres around the world to accurately evaluate the intensity of tropical cyclones(TCs)from meteorological operational satellites.The algorithm development team has introduced new improvements to the objective ADT to further extend its capabilities and accuracy.A study has therefore undergone to evaluate the new edition of ADT(9.0)based on all the North Indian Ocean Tropical cyclones during 2018,2019 and 2020(Total 15 No.).It is found that ADT(9.0)performed well with the conformity of IMD’s best track T.No estimates.ADT is reasonably good in estimating the intensity for T≥4.0(VSCS to SuCS)and overestimate the intensity for T≤3.5(CS/SCS).展开更多
文摘Characteristic features of Super Cyclonic Storm(Su CS),AMPHAN which crossed West Bengal-Bangladesh Coast on May 20,2020 have been analyzed based on INSAT-3 D&passive microwave(PMW)images with special emphasis on eye characteristics and its relationship with intensity.These satellite images/products are analyzed to determine the centre of the cyclone,its intensity and the characteristics of the eye of the cyclone.It shows the characteristic variation of intensity of Su CS with geometric and thermal characteristics of the‘eye’.Precise changes in the eye features of the cyclone can be used for very short-range forecasting of the intensity of the cyclone.
文摘Widespread catastrophic fog episodes in polluted northern India have been attributed to tropical cyclone activity in the Bay of Bengal&Arabian Sea;however,limited studies have been conducted on the effect of tropical cyclone intensity(’T’Numbers)on different fog characteristics in Indo Gangetic Basin,Northern India.In this study,different characteristics,including persistence,intensity,and areal extension,were analyzed at the Indira Gandhi International Airport,New Delhi during 1998-99,2013-14,and 2016-17.A high-intensity tropical cyclone(Severe to Very Severe Cyclonic Storm)has been found to significantly increase the persistence,intensity,and areal extension of fog by inducing strong subsidence over the IGI Airport/Indo-Gangetic Basin.This knowledge is vital for improving the short-term forecasting of fog in the IndoGangetic Basin of Northern India and will further support the Government agencies to take preventive safety measures and planning well in advance time.
文摘The Advanced Dvorak Technique(ADT)is used by tropical cyclone prediction centres around the world to accurately evaluate the intensity of tropical cyclones(TCs)from meteorological operational satellites.The algorithm development team has introduced new improvements to the objective ADT to further extend its capabilities and accuracy.A study has therefore undergone to evaluate the new edition of ADT(9.0)based on all the North Indian Ocean Tropical cyclones during 2018,2019 and 2020(Total 15 No.).It is found that ADT(9.0)performed well with the conformity of IMD’s best track T.No estimates.ADT is reasonably good in estimating the intensity for T≥4.0(VSCS to SuCS)and overestimate the intensity for T≤3.5(CS/SCS).
