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    Analysis of a severe weather event over Mecca, Kingdom of Saudi Arabia, using observations and high-resolution modelling

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    s1-ln254203051994926679-1939656818Hwf-28395476IdV-30927650025420305PDF_HI0001.pdf
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    Type
    Article
    Authors
    Dasari, Hari Prasad cc
    Attada, Raju
    Knio, Omar cc
    Hoteit, Ibrahim cc
    KAUST Department
    Applied Mathematics and Computational Science Program
    Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division
    Earth Fluid Modeling and Prediction Group
    Earth Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    Red Sea Research Center (RSRC)
    Date
    2017-08-09
    Online Publication Date
    2017-08-09
    Print Publication Date
    2017-10
    Permanent link to this record
    http://hdl.handle.net/10754/625878
    
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    Abstract
    The dynamic and thermodynamic characteristics of a severe weather event that caused heavy wind and rainfall over Mecca, Kingdom of Saudi Arabia, on 11 September 2015 were investigated using available observations and the Weather Research and Forecasting model configured at 1 km resolution. Analysis of surface, upper air observations and model outputs reveals that the event was initiated by synoptic scale conditions that intensified by interaction with the local topography, triggering strong winds and high convective rainfall. The model predicted the observed characteristics of both rainfall and winds well, accurately predicting the maximum wind speed of 20–25 m s−1 that was sustained for about 2 h. A time series analysis of various atmospheric variables suggests a sudden fall in pressure, temperature and outgoing long wave radiation before the development of the storm, followed by a significant increase in wind speed, latent and moisture fluxes and change in wind direction during the mature stage of the storm. The model outputs suggest that the heavy rainfall was induced by a low-level moisture supply from the Red Sea combined with orographic lifting. Latent heat release from microphysical processes increased the vertical velocities in the mid-troposphere, further increasing the low-level convergence that strengthened the event.
    Citation
    Dasari HP, Attada R, Knio O, Hoteit I (2017) Analysis of a severe weather event over Mecca, Kingdom of Saudi Arabia, using observations and high-resolution modelling. Meteorological Applications 24: 612–627. Available: http://dx.doi.org/10.1002/met.1662.
    Sponsors
    This research work was supported by King Abdullah University of Science and Technology (KAUST), Saudi Arabia, and the Saudi ARAMCO-KAUST Marine Environmental Research Center (SAKMERC). This research made use of the Supercomputing Laboratory resources at KAUST.
    Publisher
    Wiley
    Journal
    Meteorological Applications
    DOI
    10.1002/met.1662
    Additional Links
    http://onlinelibrary.wiley.com/doi/10.1002/met.1662/full
    ae974a485f413a2113503eed53cd6c53
    10.1002/met.1662
    Scopus Count
    Collections
    Articles; Red Sea Research Center (RSRC); Applied Mathematics and Computational Science Program; Physical Science and Engineering (PSE) Division; Earth Science and Engineering Program; Computer, Electrical and Mathematical Science and Engineering (CEMSE) Division

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