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Transcript of weather
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
- 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
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
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 ?
is the continuous process where water moves from Earths surface and back.
is the process where liquid state molecules absorb enough energy to turn into a gas state.
is the measure of the amount of water vapor in the air.
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.
is a huge body of air in the lower atmosphere.
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 air is dense and tends to sink. Cold fronts show a tendency to arrive quickly. They can cause sudden weather changes, like thunderstorms.
, or warm, air masses form in the tropics and have low air pressure.
, or cold, air masses form north of 50 north latitude and south of 50 south latitude.
air masses form over oceans.
air masses form over land.
are bands of high- speed winds about 10 kilometers above Earth’s surface.
is the swirling center of low air pressure.
is a high- pressure center of dry air, shown by and H on a weather map.
is when the warm air mass is cut off, or occluded, from the ground. It occurs when a cold front catches a warm front.
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
is a violent disturbance in the atmosphere.
is a tropical cyclone with winds of 119km/h or higher.
When hurricanes move over very cold water they weaken. The opposite strengthens them.
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.
is a small storm often accompanied by heavy precipitation and frequent thunder and lightning.
is a sudden spark, or electrical discharge, as these charges jump between parts of a cloud and the ground.
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
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
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
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.
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 ?
Wind Speed & Direction
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 ?
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.
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