Chapter 7 Lesson 2

High pressure systems bring ______________ weather

cold

On a weather map, blue triangles on a line represent a(n) _______________; red half-circles on a line represent a(n)___________

cold front warm front

At low temperatures, water vapor turns directly into solid crystals called

hail

How and why do clouds form along a front

Along a front, two different air masses meet warm air is less dense so it rises. As it rises, it cools and the moisture condenses creating clouds.

A cloud close to the ground is called

Fog

Raindrops that fall through a layer of cold air can freeze to form

Hail / Snow

Areas on a weather map that have the same air pressure are connected with lines called ________--

Iso Bars

Almost all weather fronts in North America are pushed from west to east by the ______________

Jet Stream

Clouds composed of ice crystals high in the sky are called

cirrus

As water vapor rises, it becomes colder and _________________- on particles of dust to form ___________________

condences clouds

Puffy clouds at middle altitudes are called

cumulus

Rainfall is measured with an instrument called a(n)

rain gauge

Layered clouds at low altitudes are called

stratus

To make weather maps, meteorologists collect and analyze data such as ________________, _______________-, and air pressure

temperature precipitation

When a cold, dry, air mass meets a warm, moist, air mass, that cold air pushes the warm air _____________ producing ____________ weather

up stormy

Low pressure systems bring __________ weather

warm