Session 9B.5 Anomalies in Meterological Fields Over Northern Asia and It's Impact on Hurricane Gonu

Wednesday, 30 April 2008: 9:00 AM
Palms E (Wyndham Orlando Resort)
Mostafa El -Rafy, Cairo University - Faculty of Science, GIZA, Cairo, Egypt; and D. Y. Y. Hafez Sr.

Presentation PDF (1.1 MB)

On June of year 2007, three tropical Indian storms had been recorded. One of those is a supper cyclonic storm ,hurricane, Gonu with surface wind more than 140 Knots had been observed during the period 2-7 June, 2007. The present paper investigates the anomalies in the meteorological fields over northern Asia and its impacts on Hurricane Gonu. Daily and 6-hour NCEP/NCAR reanalysis data composites for different meteorological elements over Asia for June 2007 has been used through this study. In addition to that, satellite images for hurricane Gonu has been used. These datasets have been analyzed using anomalies methodology. The results revealed that there existed outstanding anomalies in the meteorological fields distribution which persisted over northern Asia from 1 to 7 June 2007. Also, a weakling of westerlies air current aloft existed over the central region of northern Asia. This weakling of westerlies initiate invasion of strong northeastly winds over Arabian peninsula. Those unusual winds caused by the weaklings of pressure system over central Asia transfer the cyclone Gonu to become hurricane over the Arabian Sea through a short period of time. In addition, analysis of the 10- day mean anomaly of the geopotential height at 500 mb for the northern Asia for June 2007 revealed that there is outstanding negative anomalies more than -100 m over central Asia simultaneously with positive anomalies more than + 100 m over eastern part of Asia existed only during the first 10 days of June 2007.
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