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WEATHER PATTERNS Chapter 5.2- 5.3 A high-pressure system is a large body of circulating air with high pressure at center and lower pressure outside high-pressure.

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Presentation on theme: "WEATHER PATTERNS Chapter 5.2- 5.3 A high-pressure system is a large body of circulating air with high pressure at center and lower pressure outside high-pressure."— Presentation transcript:

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2 WEATHER PATTERNS Chapter 5.2- 5.3

3 A high-pressure system is a large body of circulating air with high pressure at center and lower pressure outside high-pressure system HIGH-PRESSURE SYSTEMS

4 LOW-PRESSURE SYSTEM A low-pressure system is a large body of circulating air with low pressure at center and higher pressure outside low-pressure system

5 AIR MASSES  Air masses- large bodies of air with distinct temperature and moisture characteristics. Air masses  Continental air masses form over land.  Maritime masses form over water.

6 FIVE MAIN AIR MASSES ACROSS N. AMERICA Ex: Artic air masses- bitterly cold, dry air (-40C during winter)

7 FRONTS  A weather front is a boundary between two air masses. front  Changes in weather are common at fronts.  Examples:  Cold, Warm, stationary, and occluded

8 DO NOT TAKE NOTES ON THE FOLLOWING 4 SLIDES! *ANIMATION

9 COLD FRONT When a colder air mass moves toward a warmer air mass, a cold front forms.

10 WARM FRONT A warm front forms when lighter, warmer air moves toward colder, heavier air.

11 STATIONARY FRONT When the boundary between two air masses stalls, the front is called a stationary front.

12 OCCLUDED FRONT When a fast-moving cold front catches up with a slow-moving warm front, an occluded or blocked front forms.  Usually brings precipitation!

13 WEATHER FORECASTS

14 MEASURING THE WEATHER  A surface report describes a set of weather measurements made on Earth’s surface. surface report  An upper-air report describes wind, temperature, and humidity conditions above Earth’s surface. upper-air report  Radar and Doppler radar  Doppler radar is a specialized type of radar that can detect precipitation (radar) as well as the movement of small particles, which can be used to approximate wind speed. Doppler radar

15 WEATHER MAPS **Weather maps contain symbols that provide information about the weather.

16 WEATHER MAPS  A station model uses observations from surface reports and upper-air reports.  Isobars are lines that connect all places on a map where pressure has the same value. Isobars  Isobars show the location of high- and low-pressure systems and provide information about wind speed.

17 SEVERE WEATHER

18  Thunderstorms have warm temperatures, moisture, and rising air, which may be supplied by a low-pressure system.  Thunderstorms have a three-stage life cycle: the cumulus stage, the mature stage, and the dissipation stage.

19 SEVERE WEATHER FORMATION

20 SEVERE WEATHER  A tornado is a violent, whirling column of air in contact with the ground. tornado  An intense tropical storm with winds exceeding 119 km/h is a hurricane. hurricane  A blizzard is a violent winter storm characterized by freezing temperatures, strong winds, and blowing snow. blizzard

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22 WHAT DO YOU KNOW ABOUT HURRICANE SAFETY?


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