<div class="eI0">
  <div class="eI1">Mod&egrave;le:</div>
  <div class="eI2"><h2><a href="http://www.dwd.de/" target="_blank" target="_blank">GME</a> (Global weather forecast model) from the German Weather Service</h2></div>
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  <div class="eI1">Mise &agrave; jour:</div>
  <div class="eI2">2 times per day, from 10:00 and 23:00 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">0.25&deg; x 0.25&deg;</div>
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  <div class="eI1">Param&egrave;tre:</div>
  <div class="eI2">Fog Stability Index</div>
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  <div class="eI1">Description:</div>
  <div class="eI2">
This is a stability index for fog formation. It is from 2WW/TN-79/008, &quot;A New Technique for Forecasting the Occurence of Fog and Low Stratus Ceiling by Use of a Flow Chart&quot;.<br>
The equation for the index is:<br>
<b><i>Fog Stability Index</i> = 2*(t<sub>s</sub> - t<sub>850</sub> + t<sub>s</sub> - t<sub>ds</sub> ) + W<sub>850 </sub>=</b><br>
=4t<b><sub>s</sub> - 2(t<sub>850</sub> +&nbsp;t<sub>ds</sub>) + W<sub>850</sub></b><br>
<table width="200" cellspacing="0" cellpadding="0" border="0">
  <tr height="30" bgcolor="#E5E5E5"><!-- Row 1 -->
    <td colspan="3"><font size="3" face="Arial, Helvetica" color="#0000FF">Fog risk (FSI)</td>
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  <tr height="30"><!-- Row 2 -->
    <td width="33%" valign="top"><center>high</center></td>
    <td width="33%" valign="top"><center>middle</center></td>
    <td width="33%" valign="top"><center>low</center></td>
  </tr>
  <tr height="30"><!-- Row 2 -->
    <td width="33%" valign="top"><center>FSI < 31</center></td>
    <td width="33%" valign="top"><center>31 < FSI < 55 </center></td>
    <td width="33%" valign="top"><center>FSI > 55</center></td>
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 <div class="eI0">
  <div class="eI1">GME:</div>
  <div class="eI2"><a href="http://www.dwd.de/" target="_blank">GME</a> is the first operational weather forecast model which uses an icosahedral-hexagonal grid covering the globe. In comparison to traditional grid structures like latitude-longitude grids the icosahedral-hexagonal grid offers the advantage of a rather small variability of the area of the grid elements. Moreover, the notorious "pole-problem" of the latitude-longitude grid does not exist in the GME grid.<br>
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  <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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