Weather and Climate
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Weather and Climate. Weather is a description of the changeable aspects of the atmosphere, the temperature, rainfall, pressure, and so forth, at a particular time. These changes usually affect your daily life one way or another, but some of them seem more inconvenient than others.

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Weather is a description of the changeable aspects of the atmosphere, the temperature, rainfall, pressure, and so forth, at a particular time. These changes usually affect your daily life one way or another, but some of them seem more inconvenient than others.


  • Clouds and Precipitation atmosphere, the temperature, rainfall, pressure, and so forth, at a particular time. These changes usually affect your daily life one way or another, but some of them seem more inconvenient than others.


  • Introduction atmosphere, the temperature, rainfall, pressure, and so forth, at a particular time. These changes usually affect your daily life one way or another, but some of them seem more inconvenient than others.

    • Hydrological Cycle – 4 main parts

      • Evaporation of water from the oceans

      • Transport of water vapor in the atmosphere

      • Condensation and precipitation

      • Return of water to ocean by rivers and streams


  • The main events of the hydrologic cycle are: (1) The evaporation of water from the ocean, (2) the transport of water vapor through the atmosphere, (3) condensation and precipitation of water on the land, and (4) return of water to the ocean by rivers and streams.


  • Cloud-forming Processes evaporation of water from the ocean, (2) the transport of water vapor through the atmosphere, (3) condensation and precipitation of water on the land, and (4) return of water to the ocean by rivers and streams.

    • Upward Air Movement

      • Convection resulting from differences in temperature

      • Barriers such as mountain ranges which provide lift to air masses

      • Meeting of moving air masses with different densities.


  • Adiabatic Cooling evaporation of water from the ocean, (2) the transport of water vapor through the atmosphere, (3) condensation and precipitation of water on the land, and (4) return of water to the ocean by rivers and streams.

    • Decrease in temperature of an expanding gas

  • Adiabatic Heating

    • Heating of a gas as it undergoes compression

  • Dry Adiabatic Lapse Rate

    • Rate of cooling in the absence of condensation

    • About 10 OC for each increase or decrease of 1 km (5.5OF/1,000 ft)


  • As a parcel of dry air is moved upward, it expands and cools according to the dry adiabatic lapse rate. This graph compares the temperature of a rising and adiabatically cooling parcel of dry air with the average temperatures of the surrounding atmosphere when the temperature at the surface is 30OC (86O F).


  • Atmospheric Stability according to the dry adiabatic lapse rate. This graph compares the temperature of a rising and adiabatically cooling parcel of dry air with the average temperatures of the surrounding atmosphere when the temperature at the surface is 30

    • Stability

      • When the atmospheric lapse rate is less that the dry adiabatic lapse rate

    • Instability

      • When the atmospheric lapse rate is greater than the dry adiabatic lapse rate.


  • If a parcel of air is moved up or down, it will cool or warm according to the dry adiabatic lapse rate. In a state of atmospheric stability, the parcel of air will always be cooler, and therefore more dense, than the surrounding air at any altitude. It will, therefore, return to the original level when the upward force is removed.



  • Wet Adiabatic Lapse Rate always be warmer, and therefore less dense, than the surrounding air at any altitude. The parcel will, therefore, continue on in the direction pushed when the upward force is removed.

    • The lapse rate for a parcel of air at a slow rate and releasing the temperature equal to its latent heat of vaporization

  • Supersaturated

    • When the air contains more water vapor than is the normal amount of water vapor


  • When the dew point temperature is reached in a rising parcel of air, the latent heat of vaporization is released as water vapor condenses. This release of heat warms the air, decreasing the density and accelerating the ascent. The new lapse rate from the release of latent heat is called the wet adiabatic lapse rate.


  • Origin of Precipitation of air, the latent heat of vaporization is released as water vapor condenses. This release of heat warms the air, decreasing the density and accelerating the ascent. The new lapse rate from the release of latent heat is called the wet adiabatic lapse rate.

    • Processes of precipitation formation

      • Coalescence

        • When water droplets merge with millions of other water droplets.

      • Growth of ice crystals

        • Ice crystals can capture other water molecules and grow to enormous sizes.


  • Supercooled of air, the latent heat of vaporization is released as water vapor condenses. This release of heat warms the air, decreasing the density and accelerating the ascent. The new lapse rate from the release of latent heat is called the wet adiabatic lapse rate.

    • If water remains in the liquid state after the temperature is below the freezing point.

  • Ice-forming nuclei

    • Solid particles on which the ice forms


  • Precipitation is water in the liquid or solid form that returns to the surface of the earth. The precipitation you see here is liquid, and each raindrop is made from billions of the tiny droplets that make up the clouds. The tiny droplets of clouds become precipitation by merging to form larger droplets or by the growth of ice crystals that melt while falling.


  • Weather Producers returns to the surface of the earth. The precipitation you see here is liquid, and each raindrop is made from billions of the tiny droplets that make up the clouds. The tiny droplets of clouds become precipitation by merging to form larger droplets or by the growth of ice crystals that melt while falling.


  • Introduction returns to the surface of the earth. The precipitation you see here is liquid, and each raindrop is made from billions of the tiny droplets that make up the clouds. The tiny droplets of clouds become precipitation by merging to form larger droplets or by the growth of ice crystals that melt while falling.

    • There is a shift in weather during the changes of the seasons that is related to:

      • Movement of air masses

      • Leading fronts of air masses

      • high and low pressure areas


  • Air Masses returns to the surface of the earth. The precipitation you see here is liquid, and each raindrop is made from billions of the tiny droplets that make up the clouds. The tiny droplets of clouds become precipitation by merging to form larger droplets or by the growth of ice crystals that melt while falling.

    • Polar air mass

      • An air mass that moves from a cold region

    • Tropical Air Mass

      • An air mass that moves from a warm region

    • Continental Air Mass

      • Moves in from a land mass

    • Maritime Air Mass

      • Moves in from over an ocean


  • Major types of air masses returns to the surface of the earth. The precipitation you see here is liquid, and each raindrop is made from billions of the tiny droplets that make up the clouds. The tiny droplets of clouds become precipitation by merging to form larger droplets or by the growth of ice crystals that melt while falling.

    • Continental Polar

      • Cold

      • Dry

    • Maritime Polar

      • Cold

      • Moist


  • Continental Tropical returns to the surface of the earth. The precipitation you see here is liquid, and each raindrop is made from billions of the tiny droplets that make up the clouds. The tiny droplets of clouds become precipitation by merging to form larger droplets or by the growth of ice crystals that melt while falling.

    • Warm

    • Dry

  • Maritime tropical

    • Warm

    • Moist


  • The general movement of the four main types of air masses that influence the weather over the contiguous United States. The tropical air masses visit most often in the summer, and the polar air masses visit most often during the winter. During other times, the polar and tropical air masses battle back and forth over the land.



  • Air mass weather mass moving southeast over the southern United States. Clouds form over the warmer waters of the Gulf of Mexico and the Atlantic Ocean, showing the state of atmospheric instability from the temperature differences.

    • When the weather in an area is under the influence of an air mass.


  • Weather Fronts mass moving southeast over the southern United States. Clouds form over the warmer waters of the Gulf of Mexico and the Atlantic Ocean, showing the state of atmospheric instability from the temperature differences.

    • Front

      • A boundary between two different air masses

    • Cold Front

      • When a cold air mass moves into a warmer area, displacing the warm air mass

      • Provides lift to adiabatically cool the warm air, resulting in towering cumulus and thunderclouds.




  • Warm Front might occur when an unstable cold air mass moves through unstable warm air. Stable air would result in more stratus clouds rather than cumulus clouds.

    • When a warm air mass moves into an area, displacing the cold air mass

    • A gently sloping front as the Warm air moves over top of the cooler air.

  • Stationary Front

    • When the edge of a front ceases to advance



  • Waves and Cyclones and pushing cold air in front of it. Notice that the overriding warm air produces a predictable sequence of clouds far in advance of the moving front.

    • Occluded Front

      • One that has been lifted completely off the ground

      • Has s low pressure center and cyclonic activity

    • Cyclone

      • a low pressure area with winds moving into the low pressure area and being forced upward.

      • Friction and the Coriolis effect cause the air to move to the right of the direction of movement.

    • Anticyclone

      • A high pressure center



(B) A wave develops, producing a warm front moving northward on the right side and a cold front moving southward on the left side.






  • Air sinks over a high-pressure center that moves away from the center on the surface, veering to the right in the Northern Hemisphere to create a clockwise circulation pattern. Air moves toward a low-pressure center on the surface, rising over the center. As air moves toward the low-pressure center on the surface, it veers to the left in the Northern Hemisphere to create a counterclockwise circulation pattern.


  • Major Storms the center on the surface, veering to the right in the Northern Hemisphere to create a clockwise circulation pattern. Air moves toward a low-pressure center on the surface, rising over the center. As air moves toward the low-pressure center on the surface, it veers to the left in the Northern Hemisphere to create a counterclockwise circulation pattern.

    • Thunderstorms

      • Conditions

        • Uplift of air

        • Cumulus clouds

      • Frontal Thunderstorms

        • Move with the front that produced them


  • Stages the center on the surface, veering to the right in the Northern Hemisphere to create a clockwise circulation pattern. Air moves toward a low-pressure center on the surface, rising over the center. As air moves toward the low-pressure center on the surface, it veers to the left in the Northern Hemisphere to create a counterclockwise circulation pattern.

    • Cumulus

      • Air is lifted and cools adiabatically to the dew point and a cumulus cloud develops.

      • Heat of vaporization is released and accelerates the uplift.

    • Mature

      • When the moisture that is produced reaches the surface of the Earth

      • This series of updrafts, downdrafts, and precipitation release electrical charges which become the lightening associated with the storm

    • Final

      • All of the updrafts are cut off and only downdrafts exist.

  • Lightening

  • Thunder

  • hail



(B) The mature stage begins when precipitation reaches the ground. This stage has updrafts and downdrafts side by side, which create violent turbulence.





  • Tornados automobiles, structures, and crops.

    • Most violent, focused storm on Earth

    • Speeds in excess of 300 km/hr (200 mi/hr)

  • Hurricanes

    • A hurricane is a violent storm that is produced over the warm tropical ocean near the equator.

    • Tropical Cyclone

    • Typhoon






  • Weather predictions are based on information about air masses, fronts, and associated pressure systems in an area.

  • This information is used to produce a model of behavior for weather using a computer.

    • Many models are used and then summarized when the different models agree fairly closely to a model of the weather.




  • Climate running from Houston, Texas, to near Raleigh, North Carolina, where it becomes a stationary front that runs in a northeasterly direction. Note the areas of showers and the temperature predictions.


  • Introduction running from Houston, Texas, to near Raleigh, North Carolina, where it becomes a stationary front that runs in a northeasterly direction. Note the areas of showers and the temperature predictions.

    • Climate is a generalized pattern for weather over a period of time

    • Weather describes the changes that occur to the atmospheric conditions over short periods of time.



  • Major Climate Groups in a location, the types of houses that people build, and the life-styles of people. This orange tree, for example, requires a climate that is relatively frost-free, yet it requires some cool winter nights to produce a sweet fruit.

    • Factors Determining Weather

      • Temperature

      • Moisture

      • Movement of Air


  • Low Latitudes in a location, the types of houses that people build, and the life-styles of people. This orange tree, for example, requires a climate that is relatively frost-free, yet it requires some cool winter nights to produce a sweet fruit.

    • Have vertical solar radiation at noon some times of the year

  • High Latitudes

    • Have no vertical solar radiation at noon some times of the year.

  • Middle Latitudes

    • Between high and low latitudes.



  • Tropical Climate Zone latitudes receive vertical solar radiation at noon some time of the year, the high latitudes receive no solar radiation at noon during some time of the year, and the middle latitudes are in between.

    • Near the equator and receives the greatest amount of sunlight throughout the year.

  • Polar Climate Zone

    • The Sun never sets during the summer and never rises during the winter.

  • Temperate Climate Zone

    • Average temperatures that are between the two extremes






  • Regional Climate Influence seasonable changes in autumn with a show of color.

    • Altitude

      • Higher altitudes radiate more energy back into space.

      • Temperature decreases with altitude

    • Mountains

      • Decreasing temperature with altitude

      • Uplifting effect on air masses


  • Large Bodies of Water seasonable changes in autumn with a show of color.

    • high specific heat and loses energy by evaporation.

    • This has the effect of keeping the temperatures more constant from night to day on a land mass near a large body of water

  • Ocean Currents

    • Currents move large amounts of water from different parts of the world.

    • Can warm or cool land depending upon the origin of the current



  • Describing Climates water to influence the air temperature of nearby landmasses.

    • Major Climate Zones

      • Maritime Climate

        • Influenced by air masses from the ocean

      • Continental Climate

        • Influenced by air masses from land

      • Arid

        • dry

        • Less than 25 cm (10 in) of rain per year


  • Humid water to influence the air temperature of nearby landmasses.

    • Moist

    • More than 50 cm (20 in) of rain per year

  • Semiarid

    • Between arid and humid

    • 25 – 50 cm (10 – 20 in) of rain per year



  • Local Climates with seasonal shifts in the wind and pressure areas of earth's general atmospheric circulation patterns.

    • Cities

      • Materials used to build cities have a higher heat holding capacity that natural materials.

      • Also change wind direction and speeds

    • Microclimates

      • A local pattern of climate influenced greatly by the local conditions.



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