25 3 Weather Instruments Winds are always labeled

25. 3 Weather Instruments Winds are always labeled from the direction from which they blow. Wind vane – most common, located on buildings; always point into the wind. Anemometer – measures wind speed and direction https: //www. youtube. com/watch? v=km 8 uskqf 3 k. U

Weather Balloons Weather Satellites Measuring Upper Atmospheric conditions Doppler RADAR Radio wave pulses Particles of water bounce back

Normal conditions El Niño and La Niña https: //www. youtube. com/watch? v=7 FVZrw 7 bk 1 w (4: 30) El Niño - Normally cold offshore waters are replaced by unusually strong warm equatorial waters El Niña – atmospheric phenomenon when surface temperatures of the eastern Pacific are colder than average; blows cold air over the Pacific NW & plains, but warms the rest of the U. S.

25. 4 Forecasting the Weather https: //www. youtube. com/watch? v=Gk. E 3 F 5 Au. WBQ How to read weather maps: www. youtube. com/watch? v=bd 7 Dc. Vnr. SL 8

Isobars Iso = equal Bar = pressure Pressure flows ‘around’ the pressure center • counter clockwise around lows • clockwise around highs The closer the isobars, the stronger the winds

Low pressure system: Increased clouds, winds, Chance of rain High pressure system: Clear calm conditions with reduced chance of rain. Drier air results in greater range of H and L temps.

Turn to pages 513 -514 in your text. Learn the symbols. Interpret the maps!