||The loss of snow cover from any snow or ice surface by melting, evaporation.
|Abrupt Climate Change
||Climate change occurring so rapidly that human and natural systems have difficulty adapting.
||The actual weight of water vapor within a unit of volume of air.
||The lowest temperature possible; -273.15 Celsius and -459.67 Fahrenheit.
||The process by which an organism adapts to climate changes in the environment.
||Sulfuric acid in raindrops due to
atmospheric pollution from sulfur dioxide.
||A forecast issued by the National Weather
Service regarding weather conditions that might require caution.
||The mixture of gases that forms the
atmosphere of the Earth.
||Substances in the atmosphere that directly
or indirectly causes harm to living things and property.
||Air has weight. Air pressure is the weight
of the air, or atmosphere, pushing down on Earth. The closer you are to sea
level, the higher the air pressure because there's that much air above you.
The higher you are, there is less air pressure. Barometers measure air
||A calendar with astronomical and weather
||Height expressed above sea level or ground
||The level at which a climate does not
receive enough life-promoting moisture.
||The gaseous fluid surrounding a planet.
||A luminous phenomenon seen in the night sky,
caused by the interaction of solar wind and Earth's magnetic field.
||The aurora, or southern lights, of the
||The aurora, or northern lights, of the
||Season of the year marking the transition
from summer to winter.
||An instrument that measure air pressure.
||A major snowstorm with strong winds of 35
miles per hour or more. The most notorious blizzard was the "Great White
Hurricane" that paralysed the East Coast of the United States in 1888.
||Strong winds generally 20 miles per hour or
||A light wind ranging from 4 to 31 miles per
||Weather that feels invigorating.
||The absence of any motion of the
||Zero degrees is the melting point of ice (32
degrees Fahrenheit), while its 100-degrees is the boiling point of water (212
degrees Fahrenheit). The Celsius scale replaced the Centigrade scale in 1948.
||This scale is now known as the Celsius
||A moderate, but penetrating coldness.
||A sensation of coldness severe enough to
||A sky without any visible clouds.
||Little drops of water hanging in the
atmosphere. Clouds come in a variety of shapes. The major types of clouds are
cirrus (thin, feathery), cirrocumulus (small patches of white), cirrostratus
(thin, white sheets), stratus (a low, gray blanket), cumulous (flat-bottomed,
white, putty), and cumulonimbus (mountains of dark, heavy clouds).
||The change of water vapor to liquid.
||Extremely heavy rainfall that results in
||A low pressure area in the atmosphere.
||The formation or increase of desert like
conditions in a region.
||A long period of no rainfall in a region.
Droughts can destroy crops, dry up water supplies, and sometimes lead to
widespread hunger or famine. The lack of moisture in the soil can also cause
dust storms. (See also Droughts and Heat Waves.)
||very little precipitation or moisture, as in
||A temperature scale in which the melting of
ice is at 32 degrees (0 degrees Celsius), and water boils at 212 degrees (100
||a great flowing or overflowing of water,
especially over land not usually submerged.
||A condition that exists when the air
temperature remains consistently below 0 degrees C (32 degrees F).
||The theory that the Earth's temperature is
growing warmer. In the future, global warming is expected to have damaging
consequences to human life and the Earth's ecosystems. Many climatologists
believe that increasing concentrations of carbon dioxide and other
"greenhouse gasses" in the atmosphere are the cause of global
|Green House Effect
||an atmospheric heating phenomenon, caused by
short-wave solar radiation being readily transmitted inward through the
earth's atmosphere but longer-wavelength heat radiation less readily
transmitted outward, owing to its absorption by atmospheric carbon dioxide,
water vapor, methane, and other gases; thus, the rising level of carbon
dioxide is viewed with concern.
||Pellets of ice and snow created within
clouds, that then fall to Earth. Hailstones can sometimes be quite large and
can cause significant damage. The largest hailstone ever recorded in the U.S.
was found in Aurora, Neb., on June 22, 2003. It measured 7 in. in diameter
and 18.7 in. in circumference. The costliest U.S. hailstorm took place on
July 11, 1990, in Denver, Colorado. The total damage was $625 million.
||The amount of water vapor in the air.
Relative humidity is the amount of water in the air compared to the amount of
water the air can hold at that temperature. When the relative humidity
reaches 100%, the air has reached its dew point. Once the air reaches this
point, the water vapor turns back into water in the form of rain, snow,
clouds or fog.
||Major storms with strong winds ranging from
40 m.p.h. to 150 m.p.h. Violent storms occurring in the region of the
Atlantic Ocean are known as hurricanes. When they appear in the Pacific they
are called typhoons.
||The solid phase of water. The volume of ice
is about 10 percent greater than when the ice melts into liquid form.
||Occurring about 6 to 9 miles above the
ground, the jet stream is a belt of very strong winds.
||Flashes of electrical discharges moving
through the atmosphere during thunderstorms. There are different types of
||A person professionally employed in the
study or practice of meteorology.
||The study of the atmosphere and all its
||Calm air that is warm and extremely humid.
||The sky covered by layers of clouds with no
||Condensed moisture that falls to the earth
as rain, sleet, snow, frost, or dew.
||liquid precipitation in the form of water
||The refraction (bending) of sunlight passing
through raindrops or fog sometimes causes a beautiful arc of colors to appear
in the sky for a brief period. The sun, the arc, and the person observing it
must be aligned just so in order for the rainbow to be visible.
||A mixture of falling rain and snow, or rain
and ice pellets.
||When clouds become too heavy with humidity,
water falls from them. In colder clouds, this water forms ice crystals that
fall from the sky as snow.
||The season of the year marking the
transition from winter to summer.
||Oppressive weather characterized by calm air
that is high in temperature and humidity.
||The season of the year marking the
transition from spring to autumn.
||The closest star to the Earth (93 million
||An instrument that measures temperature.
||The loud noise that follows lightning during
a thunderstorm. You can estimate how many miles away a storm is by counting
the number of seconds between the flash of lightning and the clap of thunder.
Divide the number of seconds by five to get the distance in miles. The
lightning is seen before the thunder is heard because light travels faster
||A tornado is a dark funnel-shaped cloud made
up of violently rotating winds that can reach speeds of up to 300 m.p.h. The
diameter of a tornado can vary between a few feet and a mile, and its track
can extend from less than a mile to several hundred miles. (See also
||Sea waves caused by earthquakes, submerged
volcanic eruptions, or other under-sea disturbances.
||A hurricane taking place in the Pacific
||The process of water changing from one state
to another and its movement from one place to another. For example, when it
rains, water drops fall to Earth. This water evaporates from the surface of
Earth and enters the atmosphere as water vapor. The water vapor then
condenses into droplets that form clouds.
||The wind chill temperature indicates how
cold people feel when outside. As the wind increases, it draws heat from the
body, driving down skin temperature and eventually the internal body
temperature. The wind therefore makes it feel much colder. If, for example,
the temperature is 0°F and the wind is blowing at 15 mph, the wind chill is
–19°F. At this wind chill temperature, exposed skin can freeze in 30 minutes.
||The season of the year marking the
transition from Autumn to Spring.