If the Earth rotated on a vertical axis, eliminating the current tilt of 22.5 degrees, significant changes in weather patterns would occur. The absence of axial tilt would result in uniform heating across the planet, leading to the disappearance of traditional seasons. This consistent exposure to sunlight would create extreme weather conditions, including superstorms in certain regions while others would experience minimal weather activity. Additionally, both poles would likely develop large ice caps, as the sun would not rise high enough to sufficiently warm these areas, allowing snow accumulation without thawing.