Waning Moon - Any moon phase in which the light is on the left side of the moon and is getting smaller until it reaches a New Moon.
Warm Front - The leading edge of a warm air mass advancing into a region occupied by cooler air. It is often associated with steady precipitation and a gradual increase in temperature.
Water Cycle - The continuous process by which water circulates between the Earth's surface, atmosphere, and oceans through evaporation, condensation, precipitation, and runoff.
Waxing Moon - Any moon phase in which the light is on the right side of the moon and is getting larger until it reaches a Full Moon.
Weather - The atmospheric conditions present at a specific time and place, including temperature, humidity, precipitation, wind speed and direction, cloud cover, and atmospheric pressure.
Wind Vane - A meteorological instrument used to determine the direction from which the wind is blowing. It typically consists of a rotating arrow or pointer mounted on a vertical axis, aligned with the prevailing wind direction.