17.2

Created by kmckee31 

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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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