<div class="eI0">
  <div class="eI1">Mod&egrave;le:</div>
  <div class="eI2"><h2>CFS: The NCEP Climate Forecast System (CFS)</h2></div>
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  <div class="eI1">Mise &agrave; jour:</div>
  <div class="eI2">1 times per day, at 17:00 UTC</div>
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  <div class="eI1">Greenwich Mean Time:</div>
  <div class="eI2">12:00 UTC = 13:00 CET</div>
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  <div class="eI1">R&eacute;solution:</div>
  <div class="eI2">1.0&deg; x 1.0&deg;</div>
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  <div class="eI1">Param&egrave;tre:</div>
  <div class="eI2">Cloud cover (low,middle,high,total)</div>
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  <div class="eI1">Description:</div>
  <div class="eI2">

Clouds are vertically divided into three levels: low, middle, and high. Each level is defined by the range of levels at which each type of clouds typically appears.<br><br>
<table  border="0" cellpadding="2" cellspacing="2" style="width:100%">
<tbody><tr>
<th>Level</th>
<th>Polar Region</th>
<th>Temperate Region</th>
<th>Tropical Region</th>
</tr>

<tr  align="center">
<th  align="left">High Clouds</th>
<td >10,000-25,000 ft<br>(3-8 km)</td>
<td>16,500-40,000 ft<br>(5-13 km)</td>
<td>20,000-60,000 ft<br>(6-18 km)</td>
</tr>

<tr align="center">
<th align="left">Middle Clouds</th>
<td>6,500-13,000 ft<br>(2-4 km)</td>
<td>6,500-23,000 ft<br>(2-7 km)</td>
<td>6,500-25,000 ft<br>(2-8 km)</td>
</tr>

<tr class="even" align="center">
<th  align="left">Low Clouds</th>
<td>Surface-6,500 ft<br>(0-2 km)</td>
<td>Surface-6,500 ft<br>(0-2 km)</td>
<td>Surface-6,500 ft<br>(0-2 km)</td>
</tr>
</tbody></table>
 <br><br>The types of clouds are:<br><br>
High clouds: Cirrus (Ci), Cirrocumulus  (Cc), and Cirrostratus (Cs). They are typically thin and white in appearance, but can appear in a magnificent array of colors when the sun is low on the horizon.<br><br>
Middle clouds: Altocumulus (Ac), Altostratus (As).  They are composed primarily of water droplets, however, they can also be composed of ice crystals when temperatures are low enough.<br><br>
 Low clouds: Cumulus (Cu), Stratocumulus (Sc), Stratus (St), and Cumulonimbus (Cb) are low clouds composed of water droplets.
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 <div class="eI0">
  <div class="eI1">CFS:</div>
  <div class="eI2">The CFS model is different to any other operational weather forecasting model you will see on Weatheronline.
<br>
Developed at the Environmental Modelling Center at NCEP (National Centers for Environment Prediction) in the USA, 
the CFS became operational in August 2004.
<br>
The systems works by taking reanalysis data (NCEP Reanalysis 2) and ocean conditions from GODAS 
(Global Ocean data Assimilation).  Both of these data sets are for the previous day, and so you 
should be aware that before initialisation the data is already one day old.
<br>
Four runs of the model are then made, each with slightly differing starting conditions, and from 
these a prediction is made.
<br>
Caution should be employed when using the forecasts made by the CFS. However, it is useful when 
monitored daily in assessing forecasts for the coming months, the confidence levels in these 
forecasts and in an assessment of how such long range models perform.
<br>
A description of the CFS is given in the following manuscript.<br>
S. Saha, S. Nadiga, C. Thiaw, J. Wang, W. Wang, Q. Zhang, H. M. van den Dool, H.-L. Pan, S. Moorthi, D. Behringer, D. Stokes, M. Pena, S. Lord, G. White, W. Ebisuzaki, P. Peng, P. Xie , 2006 : The NCEP Climate Forecast System. Journal of Climate, Vol. 19, No. 15, pages 3483.3517.<br>
<a href="http://cfs.ncep.noaa.gov/" target="_blank">http://cfs.ncep.noaa.gov/</a><br>
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 <div class="eI0">
  <div class="eI1">NWP:</div>
  <div class="eI2">La pr&eacute;vision num&eacute;rique du temps (PNT) est une application de la m&eacute;t&eacute;orologie et de l'informatique. Elle repose sur le choix d'&eacute;quations math&eacute;matiques offrant une proche approximation du comportement de l'atmosph&egrave;re r&eacute;elle. Ces &eacute;quations sont ensuite r&eacute;solues, &agrave; l'aide d'un ordinateur, pour obtenir une simulation acc&eacute;l&eacute;r&eacute;e des &eacute;tats futurs de l'atmosph&egrave;re. Le logiciel mettant en &oelig;uvre cette simulation est appel&eacute; un mod&egrave;le de pr&eacute;vision num&eacute;rique du temps.<br><br>
<br>Pr&eacute;vision num&eacute;rique du temps. (2009, d&eacute;cembre 12). Wikip&eacute;dia, l'encyclop&eacute;die libre. Page consult&eacute;e le 20:48, f&eacute;vrier 9, 2010 &agrave; partir de <a href="http://fr.wikipedia.org/w/index.php?title=Pr%C3%A9vision_num%C3%A9rique_du_temps&oldid=47652746" target="_blank">http://fr.wikipedia.org/w/index.php?title=Pr%C3%A9vision_num%C3%A9rique_du_temps&oldid=47652746</a>.<br>
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