Mesoscale Numerical Study of Quasi-Stationary Convective System over Jeddah in November 2009


25 November 2009 is an unforgettable day for the people in Jeddah, the second largest city in the Kingdom of Saudi Arabia (KSA). On that day, Jeddah turned into a disaster zone following a short heavy rainfall event that triggered flash floods leaving 122 fatalities and considerable losses. Numerical experiments using the Pennsylvania State University-National Center for Atmospheric research mesoscale meteorological model (MM5) have been performed to investigate the event. It was caused by a short quasi-stationary mesoscale convective system that developed over Jeddah and lasted for about 8 hours. Rainfall totals computed by the model exceeded 400 mmin some localities in the southern part of Jeddah city and to the north of Jeddah in Thuwal city. The limited available observed rainfall totals, atKingAbdulAzizInternationalAirportand wadiQaws rain gauges, and Jeddah’s weather radar observations corroborates the ability of the model to reproduce the spatial and temporal characteristics of the rainfall event. A synoptic environment characterized by warmRed Seasurface temperatures and high humidity in the low levels of the troposphere. A stationary anticyclone centered over the southeast of theArabian Peninsulaconcentrated the water vapour flow to a narrow passage over Jeddah. Simulation results suggested that the development of a mesolow by latent heat release, as well as cyclogenesis induced by Al Hejaz escarpments, could have played an important role in enhancing the event by providing low-level convergence and enhanced upslope winds, and upper level atmospheric instability.

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M. Haggag and H. El-Badry, "Mesoscale Numerical Study of Quasi-Stationary Convective System over Jeddah in November 2009," Atmospheric and Climate Sciences, Vol. 3 No. 1, 2013, pp. 73-86. doi: 10.4236/acs.2013.31010.

Conflicts of Interest

The authors declare no conflicts of interest.


[1] A. M. Subyani, “Hydrologic Behavior and Flood Probability for Selected Arid Basins in Makkah area, Western Saudi Arabia,” Arabian Journal of Geosciences, Vol. 4, No. 5-6, 2009, pp. 817-824. doi:10.1007/s12517-009-0098-1
[2] A. Amengual, R. Romero, M. Gomez, et al., “A Hydrometeorological Modeling Study of a Flash-Flood Event over Catalonia, Spain,” Journal of Hydrometeor., Vol. 8, No. 3, 2007, pp. 282-303.
[3] A. M. Subyani, “Geostatistical Study of Annual and Seasonal Mean Rainfall Patterns in Southwest Saudi Arabia,” Hydrological Sciences, Vol. 49, No. 5, 2004, pp. 803-817.
[4] M. A. Nouh, “Wadi Flow in the Arabian Gulf States,” Hydrological Processes, Vol. 20, No. 11, 2006, pp. 2393-2413.
[5] C. A. Doswell, H. E. Brooks and R. A. Maddox, “Flash Flood Forecasting: An Ingredients-Based Methodology,” Weather and Forecasting, Vol. 11, No. 4, 1996, pp. 560-581.
[6] R. Romero, C. A. Doswell and C. Ramis, “Mesoscale Numerical Study of Two Cases of Long-Lived Quasi-Stationary Convective Systems over Eastern Spain,” Monthly Weather Review, Vol. 128, No. 11, 2000, pp. 3731-3751.
[7] S. Anquetin, E. Yates, V. Ducrocq, et al., “The 8 and 9 September 2002 Flash Flood Event in France: A Model Intercomparison,” Natural Hazards and Earth System Sciences, Vol. 5, No. 5, 2005, pp. 741-754. doi:10.5194/nhess-5-741-2005
[8] A. Amengual, R. Romero, M. Vich and S. Alonso, “Inclusion of Potential Vorticity Uncertainties into a Hydrometeorological Forecasting Chain: Application to a Medium Size Basin of Mediterranean Spain,” Hydrology and Earth System Sciences, Vol. 13, No. 6, 2009, pp. 793-811. doi:10.5194/hess-13-793-2009
[9] M. H. T. Qari, “Geomorphology of Jeddah Governorate, with Emphasis on Drainage Systems,” Journal of King Abdulaziz University: Earth Sciences, Vol. 20, No. 1, 2009, pp. 93-116.
[10] D. E. Raitsos, I. Hoteit, et al., “Abrupt Warming of the Red Sea,” Geophysical Research Letters, Vol. 38, No. 5 2011, p. L14601.
[11] G. A. Grell, J. Dudhia and D. R. Stauffer, “A Description of the Fifth Generation Penn State/NCAR Mesoscale Model (MM5),” National Center for Atmospheric Research, Boulder, 1994.
[12] J. Thiébaux, E. Rogers, W. Wang and B. Katz, “A New High-Resolution Blended Real-Time Global Sea Surface Temperature Analysis,” BAMs, Vol. 84, No. 5, 2003, pp. 645-656.
[13] S. Y. Hong and H. L. Pan, “Nonlocal Boundary Layer Vertical Diffusion in a Medium-Range Forecast Model,” Monthly Weather Review, Vol. 124, No. 10, 1996, pp. 2322-2339.
[14] J. Dudhia, “A Multi-Layer Soil Temperature Model for MM5,” Preprints, 6th Annual MM5 Users Workshop, Boulder, 1996.
[15] S. G. Benjamin, “Some Effects of Surface Heating and Topography on the Regional Severe Storm Environment,” Ph.D. Thesis, Dept. of Meteorology, The Pennsylvania State University, University Park, 1983.
[16] J. Reisner, R. M. Rasmussen and R. T. Bruintjes, “Explicit Forecasting of Supercooled Liquid Water in Winter Storms Using the MM5 Mesoscale Model,” Quarterly Journal of the Royal Meteorological Society, Vol. 124, No. 548, 1998, pp. 1071-1107.
[17] T. Dinku S. J. Connor and P. Ceccato, “Comparison of CMORPH and TRMM-3B42 over Mountainous Regions of Africa and South America,” Springer Netherlands, Dordrecht, 2010. doi:10.1007/978-90-481-2915-7_11
[18] N. Islam and H. Uyeda, “Use of TRMM in Determining the Climatic Characteristics of Rainfall over Bangladesh,” Remote Sensing of Environment, Vol. 108, No. 3, pp. 264-276. doi:10.1016/j.rse.2006.11.011
[19] K. Suprit and D. Shankar, “Resolving Orographic Rainfall on the Indian West Coast,” International Journal of Climatology, Vol. 28, No. 5, pp. 643-657. doi:10.1002/joc.1566
[20] A. Yatagai and P. Xie, “Utilization of a Rain-Gauge-Based Daily Precipitation Dataset over Asia for Validation of Precipitation Derived from TRMM/PR and JRA25, SPIE, pp. 6404-6453. doi:10.1117/12.723829
[21] J. P. Evans, “21st Century Climate Change in the Middle East,” Climatic Change, Vol. 92, No. 3-4, 2009, pp. 417-432,
[22] J. P. Evans, “Global Warming Impact on the Dominant Precipitation Processes in the Middle East,” Theoretical and Applied Climatology, Vol. 99, No. 3, pp. 389-402.
[23] F. M. Al Zawad, “Impacts of Climate Change on Water Resources in Saudi Arabia,” The 3rd International Conference on Water Resources and Arid Environments, Riyadh, 16-19 November, 2008, pp. 1-26
[24] X. Zhang, E. Aguilar, S. Sensoy, et al., “Trends in Middle East Climate Extreme Indices from 1950 to 2003,” J. Geophysical Research, Vol. 110, No. D22, 2005, pp. D22104.1-D22104.12. doi:10.1029/2005JD006181

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