Presentation on theme: "Today’s Weather is brought to you by Westly Whithers"— Presentation transcript:
1 Today’s Weather is brought to you by Westly Whithers
2 Westly Whithers here to give you the latest about our weather. First, you need to know a little about meand how I make my predictions.
3 Meteorologist A scientist who studies and measures weather conditions. Some call me a weatherman but I went to school to learn more and became a ………MeteorologistA scientist who studies and measures weather conditions.Meteorology is the study of weather.
4 MeteorologistNeed to know how to use and read the following instruments:
5 WIND VANE A wind vane shows the direction the wind is coming from. Wind often brings a change in weather…Letters on the wind vane show which way is north, south, east, and west. An arrow turns to point into the wind. If the arrow points north, the wind is from the north. It is a called a north wind. If the arrow points between two directions, both directions are used to tell the wind direction. For example, the wind could be a northeast wind.Say it’s winter. What do you think a wind blowing from the South might bring?
6 ANEMOMETER An anemometer measures the speed of the wind. The wind pushes the cups and makes them spin. The spinning part of the anemometer is attached to a dial that shows how fast the wind is blowing.
8 THERMOMETER A thermometer is a tool that measures temperature. Temperature can be measured using Celsius (C) or Fahrenheit (F) scale. Temperature is measured in degrees.The tube thermometer contains a liquid. Heat causes matter to expand, so the liquid expands and moves up the tube when the air temperature gets warmer. The liquid moves down the tube if the air temperature gets cooler.The circle thermometer has pieces of metal inside that expand as the temperature gets hotter. A pointer hooked to these metal pieces moves and points to the temperature.A change in temperature is a sign that rain might fall soon.
10 HYGROMETER A hygrometer measures humidity (moisture) in the air. What do you think an increase inhumidity might mean for the weather?
11 BAROMETER A barometer measures changes in the air pressure. A rising barometer reading which shows increasing air pressure often occurs right before colder air arrives.Because cold air has less water in it, a rising barometer also means lower humidity and less chance of rain.What would a falling barometer reading mean?
24 Can you name this weather instrument? What doesit do?
25 Barometermeasures pressure of the atmosphere (air pressure)
26 Weather Instrument that shows which direction the wind is coming from hygrometerWeather Instrument that shows which direction the wind is coming fromWeather instrument that collects records the amount of precipitationWeather Instrument that measures air pressureWeather Instrument that measures wind speedWeather Instrument that is used in space to take pictures of the EarthWeather Instrument that measures the (humidity) moisture in the airsatelliteWeather Instrument that measures temperature
29 Air Masses Air moves in large air masses- an air mass is a large body of air that has the same temperature and humidity throughout.Air masses can be warm or cold, humid or dryAn air mass takes on the characteristics of the region that it forms overWhat would an air mass be like that formed over the equator? Northern Canada?There are four air masses that affect our weather- they usually move from west to eastWhen the weather changes in a location, what do you think happens to the air mass?
31 Fronts The border where two air masses meet is called a front Most weather changes occur along frontsThere are two main types of fronts:cold and warm
32 Fronts A cold front forms where a cold air mass moves over a warm air mass- the warm air mass is pushedup and cooled- when this happens, the water vapor inthe air mass condenses quickly and can cause briefheavy rain, thunderstorms, or snow.A warm front forms where a warm air mass movesover a cold air mass- as the warm air slides over,stratus clouds form ahead of the front and can cause longlasting rain or snow storms.
34 Weather MapsA weather map gives information about what the weather is like in an area
35 Weather Map SymbolsA sun or rain can show the current weather in the areaFronts are shown by red and blue linesTemperatures can be written on a map or shown using colorHigh and low pressure systems are shown with the letters “H” and “L”A high pressure system is formed where an area of cool dense air is surrounded by lower pressure airA low pressure system forms where an area of warm light air is surrounded by higher pressure airOther things a weather map can show include high and low temps and wind speed and direction
36 A map’s key will tell you what each symbol means. Weather Map SymbolsA map’s key will tell you what each symbol means.