An Omega Block is a weather pattern that occurs when the jet stream, the driver of our weather here on the surface, resembles the shape of the capital Greek letter, omega (Ω). The pattern results in a blocking weather pattern which means several days (and sometimes multiple weeks) with the same type of weather.

Two pockets of cold air to the east and west sink south and pinch warm air in the center north. For CNY this time around, that means warm and dry weather persists.

The pattern will finally break down later in the week, allowing for clouds, and eventually, showers and thunderstorms, to return. However, temperatures will stay warmer than average for this point in the season.