A tropical depression over the Arabian Sea moved closer to Oman in mid-October.
22 February 2022
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 1,350km 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 37–46km/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 52–61km/h. At this time the system was approximately 1,250km 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 37–46km/h and was 1,150km 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.
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 500hpa). 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.
Other Oman convection cases
Convective storm over Alsharqyiah region, Oman
In mid-May 2019 parts of Oman had widespread heavy rain with hail at times — unusual for that time of year.
Outflow boundaries over Hajar mountain range, Oman
On 5 June outflow boundaries over Oman could be seen in two different types of Meteosat imagery.
Trough of low pressure moves over Oman
Low pressure affected Oman from 13–16 March, causing six deaths, despite numerous warnings being issued by the Oman Met Office.
Heavy rainfall in Al Batinah & Muscat
During the passage of a Mediterranean-type trough, a low-pressure centre detached temporally over the Sea of Oman.
Quasi-stationary convective complex off the Oman
A quasi-stationary convective complex evolved under a high-pressure ridge off the Omani south coast.