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 29.92 inches

What is considered low pressure? Low pressure (L) is air pressure that is below 29.92 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 Instruments Upper-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