Transcript Weather Tools

Tools for
Predicting
Weather
Predicting Weather
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Observation: process of watching and noting
what occurs.
Prediction: proposed explanation based on
reasonable observations of prior events.
Forecast: predicting expected weather trends
by examining and analyzing available
weather data.
Measurement: collection of quantitative data
made by comparing a quantity with a
standard unit. In science, the units are metric.
Thermometer
A
thermometer is a
weather tool used
to measure the
temperature, a
measure of the
average kinetic
energy of a
substance.
.
Wind Vane
 Wind
is the
horizontal
movement of air
caused by heating
from the sun and
rotation of the
planet.
 Wind Vanes are
tools used to
measure wind
direction.
Anemometer
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An anemometer is a
weather tool that
measures wind speed in
MPH.
Wind Chill
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Wind Chill refers to the additional cooling effect
resulting from wind blowing on bare skin. It is the
temperature the body "feels" for a certain
combination of wind and air temperature.
This is similar to Heat Index which combines air
temperature and relative humidity.
Barometer
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Barometers are used to
measure air (barometric)
pressure, or the force
exerted on the Earth’s
surface by overlying air.
Barometer
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High pressure = light wind
& clear skies
Low pressure = windy &
overcast; cyclonic storms
form
Hygrometer
A
hygrometer is a
weather tool used
to measure
humidity, or water
content of a gas.
 Maritime air
masses have a
higher humidity
than continental
air masses.
Hygrometer
 Dew
point is the
temperature to
which a given
volume of humid air
must be cooled, at
constant
barometric pressure,
for water vapor to
condense.
Condensed water is
called dew.
Rain Gauge
A
rain gauge is a
weather tool used
to collect rain.
 Using
measurements on
the side of the rain
gauge, you can
see how many
centimeters it
rained.
Upper Level Data
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Surface weather data is important, but the
weather that we experience is largely due to
changes that occur high in the troposphere
Meteorologists gather weather data at heights of
up to 30,000 m above the surface using
ceilometers (to measure cloud height), weather
balloons (measure temperature, air pressure, and
humidity), Doppler radar (to measure rainfall and
wind speed, especially during storms, and satellite
imagery (to track clouds and precipitation)