1. 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

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

3. El Niño and La Niña New Text p. 546-547 El Niño - Normally cold offshore waters are replaced by unusually strong warm equatorial waters (Read p. 546) 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. Normal conditions

4. 25.4 Forecasting the Weather www.projectsharetexas.org/node/12016 How to read weather maps: www.youtube.com/watch?v=bd7DcVnrSL8

5. 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

6. 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.

8. Turn to page 534 in your Text. Learn the symbols. Interpret the maps!