17.2
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26 terms
Terms | Definitions |
|---|---|
 Weather | general condition of the atmosphere at a given time |
| Atmospheric Pressure | ratio of weight of air to surface it pushes on |
| Why do higher tempertures have lower atmosphere pressure? | There is less air because as you go higher in elevation, the force of gravity is weaker and it can't hold as much air in place |
| Winds are formed by... | air moving from high to low pressure |
| Hot air...and has...underneath | rises...low |
| cold air...and has... underneath | sinks...high |
| Jet stream | special belt of winds that blow across the US from West to East and brings most of the weather to PA |
| Winds get...due to earth's rotation | bent or deflected |
| What is the coriolis effect? | When earth's winds get deflected due to the rotation of the Earth |
| What are winds named after? | from where they come from |
| where a high pressure center moves clockwise | anticyclone |
| what happens when in warms up? | no clouds |
| where a low pressure center moves counter-clockwise | cyclone |
| what happens when it cools off (reaches dew point) | clouds or precipitation |
| Air mass | large body of air with uniform temperture and moisture content |
| front | boundary line where two different air masses meet |
| cold front | when cold air mass overtakes a warm air mass |
| warm front | when warm air mass overtakes cold one |
| stationary front | 2 air masses meet and neither one moves |
| occluded front | when a fast moving cold front overtakes a warm front and forces warm air off ground |
| thunderstorm | storm with rain, thunder, lightning, and possibly hail |
| downdraft | sinking current of air that can create gusty storms called squalls |
| tornado | small, whirling, funnel-shaped cyclone |
| hurricane | severe tropical storms that behaves like a cyclone |
| minimum wind speed of a hurricane | 120 km/hr (74 mph) |
| what is warm water | fuel for hurricane |
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