15 Jun 2020

The Brunei Darussalam Meteorological Department (BDMD) would like to enlighten the public regarding the weather phenomenon: squall line which was observed last Sunday, 7 June 2020 around 7.30 am.

Squall line is a band of vigorous convective activity, often with heavy thunderstorms and strong wind. The leading edge of a squall line is often made of arcus cloud. Two common types of arcus cloud are shelf cloud and roll cloud. Shelf cloud is a supplementary feature of a cumulonimbus (thunderstorms) cloud.

In our country, shelf cloud is a common sight during this time of the year, i.e. during the Southwest Monsoon season.

Cloud enthusiasts may share their collection of cloud pictures with us through our Facebook or Instagram pages @bruneiweather. Members of the general public may also e-mail us at to know more or inquire about different clouds observed in Brunei Darussalam and also to contact our Duty Meteorological Forecaster at our Weather Line 114 for more weather information.