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