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 |