Tropical depression  in Northern Indian Ocean/Arabian Sea

Tropical depression in the Arabian Sea

10 October 2015 10:00 UTC–16 October 05:00 UTC

Tropical depression  in Northern Indian Ocean/Arabian Sea
Tropical depression  in Northern Indian Ocean/Arabian Sea

A tropical depression over the Arabian Sea moved closer to Oman in mid-October.

Last Updated

04 November 2020

Published on

10 October 2015

By Said Albahri (DGMET)

The depression, which had formed in the Arabian Sea, contributed to the formation of a system which brought heavy rains to different parts of the Sultanate, leading to the overflowing of wadis. Eight people were reported to have died.

This system developed from a low pressure located, on 8 October, in the south-east part of the Arabian Sea. It was less than 1,350 km away from the nearest Sultanate's coast.

On 9 October, at around 15:00 UTC (19:00 local time) it developed into a tropical depression with wind speeds of about 37–46 km/h. Its movement was toward north-north-west.

On 10 October at 15:00 UTC the depression intensified into a deep depression with wind speeds around the centre estimated to be about 52–61 km/h. At this time the system was approximately 1,250 km away from the Oman coastline.

Over the following days it followed a generally northwestward track. While moving northwesterly the system encountered areas of dryness in the mid-to-upper level atmosphere.

On 11 October the system weakened into a low with wind speeds around the centre of 37–46 km/h and was 1,150 km away from the Oman coast.

On 13 October the well marked low weakened into an area of low pressure, located over the eastern area of the Arabian Sea.

On 15 October 17:00 UTC (21:00 local time) the Oman weather service (Oman national warning centre, PACA) issued the final bulletin indicating that the depression had dissipated.

Figures 1 and 2 are the Meteosat-7 enhanced infrared images showing the depression at its most intense on 10 October and when it had dissipated on 13 October.

 Met-7, 10 Oct 2015, 04:30 UTC
Figure 1: Met-7 Enhanced IR, 10 Oct 2015, 04:30 UTC. Full Resolution
 
 Met-7, 13 Oct 2015, 04:30 UTC
Figure 2: Met-7 Enhanced IR, 13 Oct 2015, 04:30 UTC. Full Resolution Download animation 13 October

The convective clouds associated with the depression didn't reach the coast, however, the low level wind pattern played a big role in feeding the northern part of Oman with moisture before the arrival of the upper-level trough (at 500 hpa). The availability of moisture with the existence of western upper-level trough resulted in large amounts of rainfall during the three days after the dissipation of the tropical depression.

 10 m winds and MSLP, 15 Oct 2015, 06:00 UTC
Figure 3: 10 m winds and MSLP, 15 Oct 2015, 06:00 UTC. Full Resolution
 
 Geopotential Height and Temperature at 500 hPa, 15 Oct 2015, 06:00 UTC
Figure 4: Geopotential Height and Temperature at 500 hPa, 15 Oct 2015, 06:00 UTC. Full Resolution
 

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