Air masses are classified based on their and amount of

Air masses get their characteristics based on

The abbreviations used to classify air masses use the following letters: c, m, T, P, and A. For each letter, describe its property: WordMeans c m T P A continentaldry maritimemoist Tropicalwarm Polarcold Arcticvery cold

warm and moistcold and dry

mT air mass warm, moist air Low Pressure Center cP air mass dry, cool air High Pressure Area

mT air mass warm, moist air Low Pressure Center cP air mass dry, cool air High Pressure Area

mT air mass warm, moist air Low Pressure Center cP air mass dry, cool air High Pressure Area

mT air mass warm, moist air Low Pressure Center cP air mass dry, cool air High Pressure Area

mT air mass warm, moist air Low Pressure Center cP air mass dry, cool air High Pressure Area

Pressure Systems, Fronts, and Weather Complete the following notes from your book. You may work with a partner. We will come back and go over these note and make sure you have written them correctly.

Fronts Warm front

Fronts Warm fronts –Form when warm air moves into an area formerly covered by cold air –Shown on a weather map by a red line with semi-circles pointing toward the colder air Warmer air Colder air

Fronts Warm fronts –As the warmer, less dense air rises, it cools  This produces clouds and frequent precipitation –Warm fronts move slowly, so the precipitation is light-to-moderate over a large area for a long period of time

Fronts Cold Front

Fronts Cold fronts –Form when cold, dense air moves into an area formerly occupied by warmer air –Shown on a weather map by a blue line with triangles pointing toward the warmer air Colder air Warmer air

Fronts Cold Fronts –Move much more quickly than warm fronts –Associated with heavy precipitation that is short-lived

Fronts Stationary Fronts –Form when the flow of air is neither toward the cold air mass, nor toward the warm air mass –The front does not move –Shown by blue triangles on one side and red semicircles on the other –Gentle to moderate precipitation

Fronts Occluded Front –Forms when a cold front overtakes a warm front –Complex weather patterns –Precipitation is common on both sides of an occluded front

Pressure Systems Low Pressure –Air moves in a counter-clockwise direction –Made of rising warm air that flows inward –Associated with clouds and precipitation High Pressure –Air moves in a clockwise direction –Made of sinking cold air that flows outward –Associated with fair weather

F

\ Temperature Dewpoint Wind Direction & Speed Barometric Pressure Current Weather Cloud Cover Barometric Trend

Barometric Pressure Add a decimal between the last two digits 13.8 Add a 9 or 10 in front to fit on the scale (ranges from to )