Weather test

Front

A boundary between two air masses

Warm front

a front where warm air moves over cold air and brings drizzly rain and then are followed by warm and clear weather

Cold front

forms when cold air moves under warm air which is less dense and pushes air up (produces thunderstorms heavy rain or snow

Occluded front

warm air mass caught between two colder air masses overtakes and brings cool temperatures and large amounts of rain and snow.

Stationary front

boundary between air masses that don't move, causing rain for several days

High pressure

A mass of sinking cool air that usually bring fair weather. (above 1013 millibars/29.92 inches of mercury (inHg))

Low pressure

mass of rising warm air that usually brings wet, stormy weather.

(below 1,000 millibars/29.80 inches of mercury (inHg))

Isobars

Lines joining places on map with same or similar air pressure

Isotherms

equal or similar temperature lines

Air mass

body of air with about same temp and moisture throughout

Continental Air mass

Forms over land, dry

Maritime Air mass

Forms over water, humid

Polar maritime air mass

Wet, cold air brings cold, showery weather (ex: North atlantic and North pacific oceans)

Polar continental air mass

cold, dry air mass (ex: Canada)

Arctic maritime air mass

Wet, cold air brings snow in winter (ex: Arctic ocean

Arctic continental air mass

dry, formed over frigid, ice covered regions (ex: Alaska)

Tropical maritime air mass

warm, wet (ex: Caribbean sea)

Tropical continental air mass

warm, dry (ex: Sahara desert)

strong winds

isobars are closer

even air pressure

isobars are far apart

direction for front in U.S

west to east