Analysis of the dynamism and Hazards of Nilofar Tropical Storm

Document Type : Research Article


1 Assistance Professor, Tarbiat Modares University

2 Ph.D. student in Climatology, Tarbiat Modares University

3 Associated Professor, Tarbiat Modares University


Tropical storm is a one of the major hazards that threat the southern coastal zones of Iran. Understanding of such hazards and knowledge of the time of their occurrence could be useful in the management of accidents caused by them. The aim of this study is analysis of the dynamism and hazards of recent tropical storm formed over the Arabian Sea is known as the Hurricane Nilofar. The data used include re-analyzed data of SLP (Sea Level Pressure), Geopotential Height, wind (U and V components), Omega, specific humidity, CAPE (Convective Available Potential Energy), Vorticity advection and SST (Sea Surface Temperature) for Nilofar storm activity in end days of October 2014 obtained and plotted than were analyzed. The results showed that the depth of the trough level of 500 mb with the axis southwest - northeast, creates a cut of low on 25 and 26 October on the Arabian Sea that following the practice causing a divergence in the eastern side of the cut of low on level of 500 mb and creating a strong convergence zone in the lower levels of the atmosphere and on the surface of the sea. Eastward movement of trough on third day of the formation of hurricanes and out of the activity storm, also, its change the mechanism of action following the availability of energy from the ocean surface (conversion of thermal energy into mechanical) to strengthen the updraft and downdraft currents on the wall of the eye and eye of storm has helped, as of this day and the next day the storm activity, increase speed to low level jet stream than the upper levels of atmosphere, causing the energy source the storm is chanced from upper levels to the lower levels of the atmosphere, also the interaction of tongues and anticyclonic centers located on the Arabian Sea, direction and movement of the storm has created to overturn it on 31 October.


]1[. خسروی، محمود؛ پودینه، محمدرضا (1389). تحلیلی بر تأثیرات اقلیمی سیکلون حاره­ای گونو (خرداد 1386) بر جنوب شرق ایران، پژوهش­های جغرافیای طبیعی، شمارة 72: 72-53.
]2[. قویدل رحیمی، یوسف (1390). نگاشت و تحلیل همگرایی جریان رطوبت جو طی بارش فوق سنگین ناشی از توفان حاره­ای فت در سواحل چابهار، مدرس علوم انسانی – برنامه‌ریزی و آمایش فضا، دورۀ پانزدهم، شمارة 2: 118-101.
]3[. لشکری، حسن؛ کیخسروی، قاسم (1389). تحلیل سینوپتیکی توفان گونو و اثرات آن بر جنوب شرق ایران، مجلة جغرافیا و برنامه‌ریزی محیطی، سال 21، شمارة پیاپی 39، شمارة 3: 20‌–‌1.
]4[. مقیمی، ابراهیم (1393). دانش مخاطرات برای زندگی با کیفیت بهتر و محیط پایدارتر، تهران: انتشارات دانشگاه تهران.
[5]. Bhaskaran, P. K., et al. (2013). "Performance and validation of a coupled parallel ADCIRC–SWAN model for THANE cyclone in the Bay of Bengal." Environmental Fluid Mechanics 13(6): 601-623. DOI:10.1007/s10652-013-9284-5.
[6]. Briegel, L. M. and W. M. Frank (1997). "Large-scale influences on tropical cyclogenesis in the western North Pacific." Monthly weather review 125(7): 1397-1413. DOI:
[7]. Dunkerton, T., et al. (2009). "Tropical cyclogenesis in a tropical wave critical layer: Easterly waves." Atmos. Chem. Phys 9: 5587-5646.Doi:10.5194/acp-9-5587-.
[8]. Emanuel, K. ((2005). "Increasing destructiveness of tropical cyclones over the past 30 years." Nature 436(7051): 686-688. Doi:10.1038/nature03906.
[9].Emanuel, K. A. (1991). "The theory of hurricanes." Annual Review of Fluid Mechanics 23(1): 179-196.DOI: 10.1146/annurev.fl.23.010191.
[10].Gray, W. M. (1998). "The formation of tropical cyclones." Meteorology and atmospheric physics 67(1-4): 37-69. DOI: 10.1007/ BF01277501.
[11].Gulev, S., et al. (2001). "Extratropical cyclone variability in the Northern Hemisphere winter from the NCEP/NCAR reanalysis data." Climate Dynamics 17(10): 795-809. DOI: 10.1007/s003820000145.
[12].Jullien, S., et al.(2012) "Impact of tropical cyclones on the heat budget of the South Pacific Ocean." Journal of Physical Oceanography 42(11): 1882-1906. Doi:
[13].KING, D., DAVIDSON, J. & ANDERSON-BERRY, L. 2010. Disaster Mitigation and Societal Impacts. Global Perspectives on Tropical Cyclones: From Science to Mitigation, 4, 409. Doi: 10.1142/9789814293488_0013.
 [14].Lin, C.H., et al. (2013)."The Effect of Tropical Cyclones (Typhoons) on Emergency Department Visits." The Journal emergency medicine45(3):372-379. DOI: 10.1016/j.jemermed.2013.02.002.
[15].Liou, C.-S. (2007). "Sensitivity of high-resolution tropical cyclone intensity forecasts to surface flux parameterization." Natural Hazards 41(3): 387-399. DOI: 10.1007/s11069-006-9046-5.
[16].Nie, H., et al. (2012). "Simulating a typhoon storm surge using a nested Ecomsed model." Procedia Engineering 31: 775-780. Doi:10.1016/j.proeng.2012.01.1101
[17].Rao, R. (1987). "Further analysis on the thermal response of the upper Bay of Bengal to the forcing of pre-monsoon cyclonic storm and summer monsoonal onset during MONEX-79." Mausam 38(2): 147-156Doi: 10.12691/ajmo-2-2-2.
[18].Roy, C. and R. Kovordányi (2012). "Tropical cyclone track forecasting techniques―A review." Atmospheric research 104: 40-69. Doi:
[19].Sadhuram, Y. (2004). "Record decrease of sea surface temperature following the passage of a super cyclone over the Bay of Bengal." Current Science 86(3): 383-384p.Doi: 10.12691/ajmo-2-2-2.
[20]. Schade, L. R. (2000). "Tropical cyclone intensity and sea surface temperature." Journal of the atmospheric sciences 57(18): 3122-3130. Doi:;2
[21].Simmonds, I. and K. Keay (2000). "Variability of Southern Hemisphere extratropical cyclone behavior, 1958-97." Journal of Climate13(3):550561.Doi:;2.
[22]. Vincent, E. M., et al. (2012). "Processes setting the characteristics of sea surface cooling induced by tropical cyclones." Journal of Geophysical Research: Oceans (1978–2012) 117(C2). DOI: 10.1029/ 2011JC007396.
[23].Webster, P. J., et al. (2005). "Changes in tropical cyclone number, duration, and intensity in a warming environment." Science 309(5742): 1844-1846. DOI: 10.1126/science.1116448.