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weather

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by

Mark Gittens

on 18 November 2015

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Transcript of weather


Humidity

is the measure of the amount of water vapor in the air. Water vapour is the gaseous state
of water and is invisible.
Humidity indicates the likelihood of precipitation and dew. R= M A W V A

Relative Humidity
- expressed commonly as a percentage value, is the ratio of the actual amount of water vapor present in a sample. RH= % V R A M W V P S


Cumulus
Clouds:
They are clouds that look like cotton. The word cumulus means "heap" in Latin. This cloud is a short cumulus cloud, which usually indicates fair weather.
What are Clouds ?
Air Masses and Fronts
Other Information
Largest hail stone was 8 inches in diameter and weighed almost 2 pounds.
Fastest wind gust ever recorded was 231 m.p.h.
Hottest temperature recorded in the U.S. was134 degree Fahrenheit
What is Precipitation ?

Storms
Other Vocabulary

Water

cycle
is the continuous process where water moves from Earths surface and back.
Evaporation
is the process where liquid state molecules absorb enough energy to turn into a gas state.
Condensation
forms clouds.
Humidity
is the measure of the amount of water vapor in the air.
Other infomation

Clouds
Serve several important functions.
Provide rain and snow.
Help retain heat so it does not escape back quickly to space.
On a hot day they provide shade.
Air

mass
is a huge body of air in the lower atmosphere.

A
front
is the boundary where the air masses meet becomes a front or a boundary between two air-masses.
What are Air Masses
and Fronts ?
Cold Front
Cold air is dense and tends to sink. Cold fronts show a tendency to arrive quickly. They can cause sudden weather changes, like thunderstorms.
Warm Fronts
Other Vocabulary

Tropical
, or warm, air masses form in the tropics and have low air pressure.
Polar
, or cold, air masses form north of 50 north latitude and south of 50 south latitude.
Maritime
air masses form over oceans.
Continental
air masses form over land.
Jet

stream
are bands of high- speed winds about 10 kilometers above Earth’s surface.
A
cyclone
is the swirling center of low air pressure.
An
anticyclone
is a high- pressure center of dry air, shown by and H on a weather map.

Occluded Front
Occluded
is when the warm air mass is cut off, or occluded, from the ground. It occurs when a cold front catches a warm front.
Stationary Fronts
The warm fronts arrive slowly. Therefore, the weather may be rainy or cloudy for a couple of days.
When a cold and warm air masses meet, but neither one can move the other, a
stationary

front
happens.
Basic Vocabulary
A
storm
is a violent disturbance in the atmosphere.
Hurricanes
A
hurricane
is a tropical cyclone with winds of 119km/h or higher.
When hurricanes move over very cold water they weaken. The opposite strengthens them.
Tornadoes
A
tornado
is a rapidly whirling, funnel-shaped cloud. Tornadoes usually weaken if cold or dry air starts feeding into the updraft of the thunderstorm that drives the tornado.

Other Vocabulary

A
thunderstorm
is a small storm often accompanied by heavy precipitation and frequent thunder and lightning.
A
lightening
is a sudden spark, or electrical discharge, as these charges jump between parts of a cloud and the ground.
A
storm

surge
is a “dome” of water that sweeps across the coast where the hurricane lands.


Largest hail stone
Fastest wind gust record
Hotest temperature recorded in the U.S
THE END
Cirrus
clouds are wispy, feathery clouds. It's name comes from a word meaning "curl". These clouds usually indicate fair weather.
Found in the high atmosphere
Stratus
clouds are clouds that form in flat layers. The name forms from the word meaning "spread out". They may produce drizzle, rain, or even snow. Found in the low atmosphere
Cirrus Clouds (Wispy)
Stratus Clouds (Layered)
It is the state of the atmosphere at a given time and place with respect to variables such as:
Temperature, Moisture,Wind and Air Pressure.
Or the state of the atmosphere to the
degree that it is hot or cold, wet or dry ,calm or stormy, clear or cloudy
.
Climate
It is the average weather in a place over many years. For example, deserts have a hot and dry climate while Antarctic has a very cold and dry climate.
Weather
Other Information
Weather
It takes place in the Troposphere.
It can change drastically in a 24 hour period
It is different than Climate.
What is Climate ?
What is Relative Humidity ?
What Causes Weather ?
The direct result of energy from the sun.
The sun's rays hit the earth and the land absorbs the heat unevenly
This uneven heating causes changes in weather
The atmosphere is heated mainly by the energy that is radiated back up form the Earth's surface
What does Weather include ?
Air Temperature
Relative Humidity
Cloud Cover
Precipitation
Wind Speed & Direction

Temperature
This is the amount of heat in a substance. Expressed in degree Fahrenheit or Celsius
The temperature of a region is affected by latitude and the altitude
It is measured by an instrument called a thermometer
What is Weather ?
Weather Weather
They are visible mass of condensed water vapor or fine water droplets or ice particles suspended in the atmosphere at different altitudes.

Cumulus Clouds (Puffy)
The Three main types are:
Cirrus , Cumulus, Stratus
It is water released form clouds in the form of rain, freezing rain, sleet, snow, or hail.
Humidity
is the measure of the amount of water vapor in the air. Water vapor is the gaseous state
of water and is invisible.
Humidity indicates the likelihood of precipitation and dew
THE
END
Full transcript