On 19 January a squall line caused flooding in areas around Muscat in Oman.
14 November 2020
19 January 2015
Areas of Muscat were flooded when the squall line brought intense rainfall in a short period of time. Patients were reported to have been evacuated from a hospital and schoolchildren had to be rescued, .
On 18/19 January a deep upper trough passed down the Arabian peninsula and the Gulf.
The deep trough (seen on Figure 2) triggered unusual heavy hailstorms over parts of Abu Dhabi and Ras Al Khaima.
Many other thunderstorms formed over other Gulf countries and brought rain and dust.
The minimum temperature at Jabal Shams (2960 m, highest point of the peninsula) dropped to -9 °C.
In the middle of the morning of 19 January a squall line expanded from a convective system over the Iranian coast out to the Sea of Oman, just south of the Strait of Hormus (see orange arrows on Figure 3).
After 11:00 UTC (15:00 local) its southern edge passed exactly over the heavily urbanised area of Muscat, the capital of Oman (Figure 1).
The Suomi-NPP imagery (with the IR11.45 band (I5)) and Natural Colour RGB imagery (both 375m spatial resolution) (Figure 4) showed more details of the squall line and the convective system to the north.
In particular, the cloud tops were not extremely cold, a sign that the clouds developed in a cold airmass with a relatively low tropopause.
Although the convective cloud tops did not reach very high, they produced torrential downpours. The water filled the wadis leading to the downtown area of Muscat.
Weather: Heavy rains lash Oman (YouTube/Times of Oman)
Oman weather: ROP, onlookers help evacuate Indian school students in flooded Wadi Kabir (Times of Oman)
Winter storm wreaks havoc in Muscat (Gulf News)
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