CONVECTION REVIEW  How does convection work?  Convection creates pressure systems.  When Air Rises = Low Pressure zone  When Air Sinks = High Pressure zone

HIGH PRESSURE SYSTEMS Characteristics  Air is going to sink in areas of high pressure.  Air is going to spread out  Move away from the high  These rotate because of the Coriolis Effect  Clockwise

LOW PRESSURE SYSTEMS Characteristics  Air is rising in a low pressure system.  Air is coming together here  flowing towards a low pressure system.  This rotates because of the Coriolis effect  Counterclockwise

HIGH VS LOW  What is considered high pressure?  High pressure (H) is air pressure that is equal to or above inches  What is considered low pressure?  Low pressure (L) is air pressure that is below inches.

HOMEMADE BAROMETER  Used to measure air pressure  Scientific Explanation:  The pressure inside the jar is constant as we sealed it. So when the atmospheric pressure ie, the pressure outside the jar, increases it pushes the rubber lid into the can which causes the straw to go up. So if the markings are higher than that was in the previous day, the atmospheric pressure is high and vice versa.

WEATHER INSTRUMENTS Surface InstrumentsUpper-Level Instruments  Anemometer: Wind Speed  Hygrometer: Relative Humidity  Rain Gauge: Measures Rainfall  Ceilometer: Height of Clouds  Radiosondes:  Measure Temperature, Pressure, and Humidity  Doppler Radar:  Uses frequencies  Like Echolocation  Satellites:  Track Clouds

FORECASTING  Uses isopleths to plot data globally  Isopleth = Lines of equal value  Short Term Forecast = Very Accurate  Use Immediate wind movement and cloud patterns  Long Term Forecast= Inaccurate  Vague  Too many factors