Create an account
(cP) Continental Polar Air Mass
Forms over Northern Canada and brings extremely cold weather to US in winter and cool dry weather in the summer.
(mP) Maritime Polar Air Mass
Forms over the North Pacific and brings cool, very wet weather to the Pacific Coast and fog in summer. Also forms over North Atlantic Ocean and brings cloudy weather and precipitation to New England in winter and fog in summer.
(mT) Maritime Tropical
Develop over warm areas over the Pacific (mild)
Others develop over the Atlantic and Gulf of Mexico and bring hot humid weather in summer, hurricanes and thunderstorms.
Continental Tropical (cT) form over the desert of Northern Mexico and SW United States brings clear, dry, hot weather northward in summer.
When a warm air mass is caught between two colder air masses - cool temperatures and large amounts of rain or snow.
When a cold air mass meets a warm air mass and remain separated. Brings many days of cloudy, wet weather.
Areas that have lower pressure than the surrounding areas do. Air masses come together and rise. Stormy weather occurs.
Please allow access to your computer’s microphone to use Voice Recording.
Having trouble? Click here for help.
We can’t access your microphone!
Click the icon above to update your browser permissions and try again
Reload the page to try again!Reload
Press Cmd-0 to reset your zoom
Press Ctrl-0 to reset your zoom
It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.
Please upgrade Flash or install Chrome
to use Voice Recording.
For more help, see our troubleshooting page.
Your microphone is muted
For help fixing this issue, see this FAQ.
Star this term
You can study starred terms together