Visibility was particularly limited along the Saigon River and several canals, where the mist was thick.

The fog formed close to the ground and extended upward to more than 100 meters.

Above this layer, clouds appeared in multiple dense bands, preventing early sunlight from reaching the surface.

Such weather patterns commonly occur at the end of the year, when frequent rain, high humidity, and the weak influence of diffused cold air combine to create foggy mornings in the city.

The southern metropolis may be affected by the distant circulation of storm Kalmaegi, the 13th storm to hit the East Vietnam Sea this year, with widespread rain in the late afternoon and evening.

Also, high tides are forecast to peak on Thursday.

The combination of downpours and tidal surges could lead to severe flooding on several streets in the city during the rush hour.

Kalmaegi is forecast to make landfall over the central region, from Quang Ngai to Gia Lai Provinces, late on Thursday afternoon or in the evening, with strong winds at levels 10-12 (89-133 kmph), and gusts of up to levels 14-15, according to the national weather center.