Monitoring Weather Temperature Average kinetic energy of the

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Monitoring Weather

Monitoring Weather

Temperature Average kinetic energy of the molecules in the atmosphere ◦ How hot or

Temperature Average kinetic energy of the molecules in the atmosphere ◦ How hot or cold it is Measured with a thermometer or temperature probe

Wind Speed How fast the wind is blowing Measured with an anemometer Units: knots,

Wind Speed How fast the wind is blowing Measured with an anemometer Units: knots, miles or km per hour

Wind direction �Direction from which the wind is blowing �Expressed as points on the

Wind direction �Direction from which the wind is blowing �Expressed as points on the compass – N, S, E, W

Humidity �Measure of the amount of moisture in the atmosphere �Usually expressed as relative

Humidity �Measure of the amount of moisture in the atmosphere �Usually expressed as relative humidity ◦ ratio of the amount of water vapor actually present in the air to the maximum amount of water vapor the air can hold at a given temperature �Measured with a sling psychrometer

Humidity (cont. )

Humidity (cont. )

Humidity (cont. )

Humidity (cont. )

Humidity (cont. ) �Humidity can also be expressed as the dew point ◦ Dew

Humidity (cont. ) �Humidity can also be expressed as the dew point ◦ Dew point is the temperature at which water condenses ◦ Measured with a sling psychrometer and a chart (just like relative humidity)

Air Pressure Aka. barometric pressure Force exerted by air molecules pushing down Measured with

Air Pressure Aka. barometric pressure Force exerted by air molecules pushing down Measured with a barometer Units: millibars, inches of mercury

Air Pressure (cont. ) �Air pressure can tell us about what kind of weather

Air Pressure (cont. ) �Air pressure can tell us about what kind of weather to expect. ◦ If a high pressure system is on its way, often you can expect clear skies. ◦ If a low pressure system is coming, then look for storms and rain.

Precipitation Water falling from clouds ◦ Rain, snow, sleet, hail Measured with a rain

Precipitation Water falling from clouds ◦ Rain, snow, sleet, hail Measured with a rain gauge or a ruler Measured in inches or millimeters

Weather Balloons Collect data on atmospheric conditions Flights last about 2 hours Rise up

Weather Balloons Collect data on atmospheric conditions Flights last about 2 hours Rise up to 100, 000 ft. Expand from 6 ft to 20 ft in diameter

Radar Type of radar that is used to locate precipitation, estimate the type, and

Radar Type of radar that is used to locate precipitation, estimate the type, and calculate its motion Most are doppler radar

Satellites Monitor weather, climate and other conditions on Earth. ◦ ◦ Clouds Fires Effects

Satellites Monitor weather, climate and other conditions on Earth. ◦ ◦ Clouds Fires Effects of pollution Sand dust storms ◦ Ocean currents ◦ Volcanic eruptions ◦ Changes in vegetation -Oil spills - ice fields -Glaciers -Weather systems and other storms

Data is used to create weather maps. �http: //www. accuweather. com/index- radar. asp? partner=netweather

Data is used to create weather maps. �http: //www. accuweather. com/index- radar. asp? partner=netweather

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