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25.3 Weather InstrumentsWinds 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
Weather BalloonsMeasuring Upper - Atmospheric conditions
Doppler RADARRadio wave pulses
Particles of water bounce back
Weather Satellites
El Niño and La NiñaNew 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
25.4 Forecasting the Weather
www.projectsharetexas.org/node/12016
How to read weather maps:www.youtube.com/watch?v=bd7DcVnrSL8
IsobarsIso = equalBar = 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 page 534 in your Text. Learn the symbols.
Interpret the maps!
