pressure Flashcards
air characteristics of high pressure
cold and dry air, air sinks, warms, compresses, dries (SCWD) anticyclone
air charecteristics of low pressure
warm and wet air, air rises, expands, cools, condenses to the dew point (RECCD) cyclone
high pressure conditions
clear skies, not lots of moisture in the atmosphere
low pressure conditions
rainy, cloud cover, precipitation
high pressure moisture and density
holds less mouisture and air molecules are more dense
low preassure moisture and density
holds more moisture and air molecules are less dense (rise)
how is pressure measured
barometer
what are equal lines of pressure called?
isobars
where does wind travel through
northeast
“condesnation nuclei”
tiny particles such as dust, ash, pollen and pollution that water vapor condenses
what happens to warm air and why
warm air rises because its less dense
what does RECCD stand for
rises, expands, cools, condenses to the dew point
what temp and characteristic does low pressure have
high temp and light
what does a falling barometer mean
stormy, rainy and unsettled weather, low pressure
when and where do hurricanes form
form over warm, evaporating water usually form in late summer
how do hurricanes lose energy
go over cooler water (not much evaporation), move over land so water source is not cut off
how do tornados form
cP air mass meets up with an mT airmass
when and where do tornados form?
occurs in tornado alley during the spring (April-june)
what happens when air rises
it expands
when happens when air sinks
it contracts
how do surface winds blow for low pressure
inwards and counter clockwise
how do surface winds blow for high pressure
out ward and clockwise
