What is the geographical location of "Western Siberia" often mentioned in the weather forecast?

Siberia is a large area of North Asia in Russia. It starts from the Ural Mountains in the west, east to the Pacific Ocean, north to the Arctic Ocean, southwest to the mountainous areas in central and northern Kazakhstan, and south to China, Mongolia and North Korea, covering an area of 6,543,802,760 square kilometers, all of which are in Russian territory except the southwest end. Some people regard the watershed between the Arctic Ocean and the Pacific Ocean as its eastern boundary.

Western Siberia is the western part of Siberia, Russia. It faces the Arctic Ocean in the north, the Urals in the west and the Yenisei River in the east. It covers an area of about 3 million square kilometers. Most of them are the western Siberian plain, and Altai Mountain, Saler Mountain and Kuznetsk Mountain are in the southeast. From north to south, tundra zone, forest tundra zone, forest belt, forest grassland belt and grassland belt are in turn. Including Altai Territory, Tyumen, omsk, Novosibirsk, Tomsk, Kemerovo and the western edge of krasnoyarskiy kray.