This is the 8554th most frequent Russian word.
облачный
"Oblachnyy" means "cloudy" in English.
Here, 'облачный' is used as an adjective to describe the weather (day), meaning that the sky is covered with clouds.
Сегодня облачный день.
Today is a cloudy day.
In this sentence, 'облачный' is used in the technological context, referring to online 'cloud' storage or computing.
Он занимается облачными технологиями.
He works with cloud technologies.
Here, 'облачный' is used figuratively to describe the appearance of the balloon as resembling a cloud.