Weather Instruments - Weather Studies -WIND VANE.pptx

Weather instruments lesson lecture notes

1. WEATHER INSTRUMENTS WIND VANE BY T J GOMENDO

2. Wind Vane Overview Definition: A wind vane, also known as a weather vane, is an instrument used to show the direction of the wind.

3. Characteristics of a Wind Vane 1. Design: - Typically shaped like an arrow or a rooster (the classic design). - Made from lightweight materials (like metal or plastic) to ensure it moves easily with the wind. 2. Components: - Pointer: The part that indicates the wind direction. - Tail: A larger surface area that catches the wind, allowing the pointer to align with the wind direction. - Pivot Point: A central axis that allows the pointer to rotate freely.

4. Characteristics of a Wind Vane 3. Measurement Units: - Wind direction is usually measured in degrees (0° for north, 90° for east, 180° for south, and 270° for west). 4. Orientation: - Most wind vanes are oriented so that the pointer points into the wind. For instance, if the wind is coming from the north, the pointer will point north.

5. How a Wind Vane Works 1. Wind Direction: - When the wind blows, it pushes against the larger tail of the vane. - The tail moves away from the direction of the wind, causing the pointer to rotate and align with the wind direction. 2. Stability: - The design ensures that the pointer always seeks to point into the wind, providing a consistent reading of wind direction.

6. How a Wind Vane Works 3. Installation: - Wind vanes are typically mounted on rooftops or tall poles where they can catch unobstructed winds.