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Volume :26 Issue : 96 2000      Add To Cart                                                                    Download

SURFACE AND UPPER LEVEL PRESSURE PATTERNS AND ANOMALIES ASSOCIATED WITH THUNDERSTORMS IN THE CENTRAL PART OF SAUDI ARABIA

Auther : Dr. Fahad Al-Kolibi

 

The surface pressure, the 500 mb geopotential heights, and the 200 mb geopotential height patterns and anomalies that associate with and precede thunderstorms events in the central part of Saudi Arabia were investigated by applying composite techniques.  Daily thunderstorms data for Riyadh, Saudi Arabia and daily surface pressure data and 500 mb, 200 mb geopotential height data for the area bounded by 10° N to 90° N and 90° W to 90° E were utilized.

           The findings indicate that March and April thunderstorm events in the central part of Saudi Arabia are not only due to a local effect but also come with active synoptic system that can be observed in surface pressure as well as different upper levels.  Three days before the thunderstorm event day, a meridional pattern develops and dominates the area extending eastward from north America to central Asia with pronounced wave pattern progresses eastward.  During the thunderstorm event day, western Saudi Arabia becomes under a deep upper level trough putting the country under a cyclogenesis effect.  Also, during the thunderstorm event day, the Red Sea surface pressure becomes more active and extends northward.  The finding of this research indicates that the combination of strong Red Sea surface low pressure and deep upper level trough provide the needed ingredient for the development of thunderstorms in the central part of Saudi Arabia.  The Surface pressure causes moist southerly wind providing the needed moisture and the upper level pattern provides the lifting mechanism, cooling and strong jet stream which intensify the instability, thus causing thunderstorms.  The findings of this research suggest that it is essential to carefully monitor the upper atmospheric patterns over the eastern Atlantic Ocean, the western Mediterranean and Europe to improve the thunderstorms forecasts in the central part of Saudi Arabia.

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May 18, 2017

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