![Page 1: WEATHER PATTERNS CHAPTER 5 LESSON 2 Weather. Pressure Systems There are 2 types of pressure systems: High-pressure system – A large body of circulating](https://reader035.vdocuments.mx/reader035/viewer/2022062423/5697bf8c1a28abf838c8ba27/html5/thumbnails/1.jpg)
WEATHER PATTERNSCHAPTER 5 LESSON 2
Weather
![Page 2: WEATHER PATTERNS CHAPTER 5 LESSON 2 Weather. Pressure Systems There are 2 types of pressure systems: High-pressure system – A large body of circulating](https://reader035.vdocuments.mx/reader035/viewer/2022062423/5697bf8c1a28abf838c8ba27/html5/thumbnails/2.jpg)
Pressure Systems
There are 2 types of pressure systems: High-pressure system – A large body of circulating air
with high pressure at its center and lower pressure outside (air sinks in the center)
Low-pressure system – A large body of circulating air with low pressure at its center and higher pressure outside (air rises at center)
![Page 3: WEATHER PATTERNS CHAPTER 5 LESSON 2 Weather. Pressure Systems There are 2 types of pressure systems: High-pressure system – A large body of circulating](https://reader035.vdocuments.mx/reader035/viewer/2022062423/5697bf8c1a28abf838c8ba27/html5/thumbnails/3.jpg)
Air Masses
Air masses – Large bodies of air with distinct temperature and moisture characteristics. They form when a large high pressure system lingers
over an area for several days.5 types of air masses:
Continental air masses – form over land Maritime masses – form over water Tropical air masses – form in warm equatorial regions Polar air masses – form over cold regions Arctic and Antarctic air masses – for near the 2 poles
(coldest regions)
![Page 4: WEATHER PATTERNS CHAPTER 5 LESSON 2 Weather. Pressure Systems There are 2 types of pressure systems: High-pressure system – A large body of circulating](https://reader035.vdocuments.mx/reader035/viewer/2022062423/5697bf8c1a28abf838c8ba27/html5/thumbnails/4.jpg)
Air Masses
![Page 5: WEATHER PATTERNS CHAPTER 5 LESSON 2 Weather. Pressure Systems There are 2 types of pressure systems: High-pressure system – A large body of circulating](https://reader035.vdocuments.mx/reader035/viewer/2022062423/5697bf8c1a28abf838c8ba27/html5/thumbnails/5.jpg)
Fronts
Front – a boundary between 2 air masses.4 types of fronts:
Cold front – cold air mass moves towards a warmer air mass
Warm front – lighter, warmer air moves towards the cooler, heavier air.
Stationary front – when the boundary between 2 air masses stalls (stays in that place for several days)
Occluded front – when a fast-moving cold front catches up to a slow-moving warm front
![Page 6: WEATHER PATTERNS CHAPTER 5 LESSON 2 Weather. Pressure Systems There are 2 types of pressure systems: High-pressure system – A large body of circulating](https://reader035.vdocuments.mx/reader035/viewer/2022062423/5697bf8c1a28abf838c8ba27/html5/thumbnails/6.jpg)
Fronts
![Page 7: WEATHER PATTERNS CHAPTER 5 LESSON 2 Weather. Pressure Systems There are 2 types of pressure systems: High-pressure system – A large body of circulating](https://reader035.vdocuments.mx/reader035/viewer/2022062423/5697bf8c1a28abf838c8ba27/html5/thumbnails/7.jpg)
Severe Weather
Examples: Tornadoes, Drought, Hurricanes, Floods, Sinkholes, Wildfires, Blizzards, Thunderstorms
Thunderstorms – Warm air rises due to a low-pressure system. 3 stages
Cumulus stage (cloud formations and updrafts, then downdrafts form)
Mature stage (heavy winds, rain, and lightning) Dissipation stage (storm ceases)
![Page 8: WEATHER PATTERNS CHAPTER 5 LESSON 2 Weather. Pressure Systems There are 2 types of pressure systems: High-pressure system – A large body of circulating](https://reader035.vdocuments.mx/reader035/viewer/2022062423/5697bf8c1a28abf838c8ba27/html5/thumbnails/8.jpg)
Tornadoes
A violent, whirling column of air in contact with the ground. Form when thunderstorms updraft begin to rotate Tornado Alley – place in central United States that
experience most tornadoes
![Page 9: WEATHER PATTERNS CHAPTER 5 LESSON 2 Weather. Pressure Systems There are 2 types of pressure systems: High-pressure system – A large body of circulating](https://reader035.vdocuments.mx/reader035/viewer/2022062423/5697bf8c1a28abf838c8ba27/html5/thumbnails/9.jpg)
Hurricanes
Intense tropical storm with winds exceeding 200km/h