3,760 Users Online
  • 640,129,772 Downloads
  • 1,461,195 Wallpapers
  • 1,034,461 Members
  • 12,971,712 Votes
  • 5,965,287 Favorites

Weather

Weather is the state of the atmosphere, to the degree that it is hot or cold, wet or dry, calm or stormy, clear or cloudy. Most weather phenomena occur in the troposphere, just below the stratosphere. Weather generally refers to day-to-day temperature and precipitation activity, whereas climate is the term for the average atmospheric conditions over longer periods of time.When used without qualification, "weather" is understood to be the weather of Earth.
Weather is driven by air pressure (temperature and moisture) differences between one place and another. These pressure and temperature differences can occur due to the sun angle at any particular

Group Information

Last Activity: 2 Weeks Ago
Group Leader: joshpetersen152
Moderators: Nannouk
Submissions: Open
Group Visitors: 98,307
Founded: April 10th, 2013

Top Contributors

Recently Active Members

Recently Joined Members

joshpetersen43
blueangels1015
NeXus9K
shimmersparkle
DarkLight6277
mobluangel
gubicii
joannpinkcat
Trix_36
katehatheway

Recently Added Wallpapers

Church House and Poppies
Church House and PoppiesUploaded by: emma999
Date Uploaded: 12/1/17
Resolution: 1920x1200
Downloads: 76
Comments: 3
Favorited: 6
Points: +6
Good day for riding
Good day for ridingUploaded by: emma999
Date Uploaded: 12/1/17
Resolution: 2560x1600
Downloads: 74
Comments: 2
Favorited: 4
Points: +4
Blue Sunset
Blue SunsetUploaded by: emma999
Date Uploaded: 11/13/17
Resolution: 2560x1600
Downloads: 33
Comments: 1
Favorited: 1
Points: +2
Sunset at the Lake
Sunset at the LakeUploaded by: emma999
Date Uploaded: 10/1/15
Resolution: 1920x1080
Downloads: 563
Comments: 11
Favorited: 22
Points: +30
Spaceship Superstar Supercell
Spaceship Superstar SupercellUploaded by: KimE12
Date Uploaded: 11/8/17
Resolution: 1500x1000
Downloads: 46
Comments: 1
Favorited: 0
Points: +3
Everglades
EvergladesUploaded by: emma999
Date Uploaded: 9/9/15
Resolution: 1153x768
Downloads: 154
Comments: 7
Favorited: 9
Points: +12

Recent Discussions

3 Months Ago
View Last Post »
Hey Guys!!!
Last post by emma999 - 4 Posts

Group Details

On Earth, common weather phenomena include wind, cloud, rain, snow, fog and dust storms. Less common events include natural disasters such astornadoeshurricanestyphoons and ice storms. Almost all familiar weather phenomena occur in the troposphere (the lower part of the atmosphere).Weather does occur in the stratosphere and can affect weather lower down in the troposphere, but the exact mechanisms are poorly understood

Weather occurs primarily due to air pressure (temperature and moisture) differences between one place to another. These differences can occur due to the sun angle at any particular spot, which varies by latitude from the tropics. In other words, the farther from the tropics one lies, the lower the sun angle is, which causes those locations to be cooler due to the indirect sunlight. The strong temperature contrast between polar and tropical air gives rise to the jet stream. Weather systems in the mid-latitudes, such as extratropical cyclones, are caused by instabilities of the jet stream flow (seebaroclinity). Weather systems in the tropics, such as monsoons or organized thunderstorm systems, are caused by different processes.

Because the Earth's axis is tilted relative to its orbital plane, sunlight is incident at different angles at different times of the year. In June the Northern Hemisphere is tilted towards the sun, so at any given Northern Hemisphere latitude sunlight falls more directly on that spot than in December (seeEffect of sun angle on climate).[9] This effect causes seasons. Over thousands to hundreds of thousands of years, changes in Earth's orbital parameters affect the amount and distribution of solar energy received by the Earth and influence long-term climate. (See Milankovitch cycles).

The uneven solar heating (the formation of zones of temperature and moisture gradients, or frontogenesis) can also be due to the weather itself in the form of cloudiness and precipitation.Higher altitudes are cooler than lower altitudes, which is explained by the lapse  On local scales, temperature differences can occur because different surfaces (such as oceans, forests, ice sheets, or man-made objects) have differing physical characteristics such as reflectivity, roughness, or moisture content.

Surface temperature differences in turn cause pressure differences. A hot surface heats the air above it and the air expands, lowering the air pressure and its density.The resulting horizontalpressure gradient accelerates the air from high to low pressure, creating wind, and Earth's rotation then causes curvature of the flow via the Coriolis effect.The simple systems thus formed can then display emergent behaviour to produce more complex systems and thus other weather phenomena. Large scale examples include the Hadley cell while a smaller scale example would becoastal breezes.

The atmosphere is a chaotic system, so small changes to one part of the system can grow to have large effects on the system as a whole. This makes it difficult to accurately predict weather more than a few days in advance, though weather forecasters are continually working to extend this limit through the scientific study of weather, meteorology. It is theoretically impossible to make useful day-to-day predictions more than about two weeks ahead, imposing an upper limit to potential for improved prediction skill.


This is Desktop Nexus Group, independently organized and operated by members of our community, focused around a specific theme or topic.   Find more groups!
99,475
Points
#396
Group Rank