Warm up Answer these questions in your notebook: 1. What is the difference between humidity and relative humidity? 2. What are clouds made of? 3. List the differences between a cold front and a warm front. Sketch the side profile of each.
QUIZ!
High Pressure Systems Formed when air moves all the way around a high-pressure center Air sinks down Spreads out toward areas of low pressure
Characteristics Large and change slowly Moves slowly clockwise Clear skies and calm air This is due to air sinking to a lower altitude, which causes it to warm up a little bit (clouds disappear)
Low Pressure Systems Surrounds a center of low pressure Air moves in toward lowest pressure Moves upward to higher altitude Upward motion moves air faster
Characteristics Stormy weather Form where a warm front meets a cold front Moves quickly counter-clockwise
Low Pressure System Examples Tropical Storms Hurricanes Winter Storms Severe Storms
Thunderstorms Definition: Storm w/ lightning and thunder Caused by rising moist air Warm, humid air moves vertically into cooler air above
Thunderstorm Formation: Cumulus Stage 1. Rising humid air (updraft) forms a cumulus cloud. Energy increases the air motion, forming a cumulonimbus cloud.
Mature Stage 2. Large ice particles form in the low temps near the top of the cloud. They fall and pull cold air down with them, forming a strong downdraft Downdraft brings heavy rain or hail This is the most severe stage of a thunderstorm
Dissipating Stage 3. Downdraft spreads out, which blocks more warm air from moving upward The blocking of warm air causes the storm to slow down and eventually end
Characteristics Thunderstorms can form: 1. At a cold front ○ Air can be forced upward quickly 2. Within an air mass ○ Uneven heating produces convection and thunderstorms
Effects of Thunderstorms Flash Floods Strong winds Hail Lightning Tornadoes
Video Segment r/?assetGuid=0637b2e bd- ada e954&fromMyDe=0&isPrinterF riendly=0&provider=&isLessonFromHeal th=0&productcode=DETB&isAssigned=f alse&includeHeader=YES&homeworkG uid=