28 terms

Weather Vocab- Set 2

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Millibars
the unit used to measure air pressure
barometer
the tool used to measure air pressure
isobars
lines that connect areas of equal pressure on a map
isotherm
lines that connect areas of equal temperature on a map
air masses
characterized by temperature and moisture,
Which direction do low pressure systems flow?
counterclockwise
Which direction do high pressure systems flow?
clockwise
Wind
horizontal movement of air from an area of high pressure to an area of low pressure
Global winds
winds that blow over long distances of Earth
Local winds
winds that blow over short distances, caused by uneven heating on Earth's surface over a small area
air mass
a large body of air that has similar temperature, humidity, and air pressure
cP- continental polar
forms over land closer to poles- cold and dry
cT- continental tropical
forms over land closer to equator- warm and dry
mP- maritime polar
forms over ocean closer to poles- moist and cold
mT- maritime polar
forms over ocean closer to equator-moist and warm
arctic air mass
very cold, forms over poles
front
the area where air masses meet but do not mix
stationary front
forms when warm and cold air meet and neither air mass has the force to move the other, may cause prolonged precipitation as long as the fronts don't move
occluded front
forms when warm air mass gets caught between two cold air masses and is cut off, may cause clouds and precipitation
warm front
forms when warm air moves over cold air, causes precipitation then warmer hair (stratus clouds)
cold front
forms when cold air moves underneath warm air forcing warm air to rise, causes thunderstorms then cooler air (cumulus or cumulonimbus clouds)
cumulus clouds
white puffy clouds, fair weather but can develop into storm clouds
cumulonimbus clouds
thunderstorm clouds, bring precipitation and storms
stratus clouds
"layered" clouds, bring consistent "drizzle" precipitation on overcast days
cirrus clouds
thin, wispy clouds made of mostly ice crystals, can signal changing weather.
station model
a diagram depicting all the relevant weather data for one location at one specific time
what can a station model tell?
air pressure, trend in air pressure (+ or - ), precipitation inches, dew point, precipitation type, temperature, wind speed and direction, cloud coverage
How do you decode air pressure?
If the number is between 000-499, add 10 in front and put a decimal between the last two digits, if the number is 500-999, add 9 in front and put a decimal point between the last two digits
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