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science flash cards
weather
| Question | Answer |
|---|---|
| Weather | The state of the atmosphere at a specific time and place. |
| Relative humidity | The amount of water vapor in the air compared to the amount needed for it to be saturated at a specific temp. |
| wind | The greater the difference in pressure, the faster the wind blows. |
| cumulus | Big, white, and, puffy clouds. |
| Air temp. | the result of movement of air molecules: the faster the molecules move, the warmer the air temp. |
| dew point | the temp at which air is saturated and condensation forms. |
| cold front | occurs when cold air moves under warm air, lifting an cooling it so that clouds form |
| warm front | occurs when warmer air moves over colder, denser air. |
| stationary front | occurs when a boundary between air masses stops moving due to similar masses. |
| low preasure system | swirl counter clock wise. A.K.A. cyclones. |
| air mass | a large body of air that has properties similar to the part of Earth's surface over which it develops. |
| hurricane | a large, swirling low preasure system that forms over the warm atlantic ocean. |
| blizzard | a winter storm with: winds of atleast 56 km/h low temp. visibility less that 400m in falling or blowing snow. these conditions lasting for 3 hrs or more. |
| severe weather safety | watch-issued when conditions are favorable for severe weather. warning-issued when severe weather already exists. |
| meteoroligist | a person who studies weather and the atmosphere using weather instruments to make weather maps. |
| stationary model | a set of symbols that shows the weather conditions at a specific location on earth's surface. |
| occluded front | occurs when cold air approaches cool air and forces the warm air between them aloft. |
| front | a boundary between two air masses of different density, moisture, or temp. |
| cirrus | curly whispy; the only cloud made of ice crystals. |
| nimbus | described a cloud that produces precipitation, as in cumulonimbus or nimbo stratus. |
| what causes thunder | air around a bolt of lighting heats quickly then quickly cools and contracts, forming sound waves. |
| what causes lighting | movement of air with in a cloud causes different parts of the cloud to become oppisitely charged. |
| precipitation | water in any form of matter, falling from clouds. rain drops vary in size due to:-strength of updrafts in clouds. |
| four main types of precipitation | -rain -snow -sleet -hail |
| thunderstorms | -signs: heavy rain, lighting and thunder possibly hail. |
| tornado | a violently rotating column of air. created by wind shear during a severe thunderstorm. |
| high preasure systems | -swirl clockwise -A.K.A. anticyclones -associated with clear weather - measured with a barometer. |
| isotherm | a line that connects points of equal temp. on weather maps. |
| isobar | a line that connects points of equal preasure on a weather map. |
| cirro | high altitude |
| strato | low altitude |
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