<div class="eI0">
  <div class="eI1">Modelo:</div>
  <div class="eI2"><h2><a href="http://www.meteofrance.fr/" target="_blank" target="_blank">Arp&egrave;ge</a>(Action de Recherche Petite Echelle Grande Echelle) from Meteo France</h2></div>
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 <div class="eI0">
  <div class="eI1">Actualiza&ccedil;&atilde;o:</div>
  <div class="eI2">4 times per day, from 08:00, 14:00, 20:00, and 00:00 UTC</div>
 </div>
 <div class="eI0">
  <div class="eI1">Greenwich Mean Time:</div>
  <div class="eI2">12:00 UTC = 12:00 WET</div>
 </div>
 <div class="eI0">
  <div class="eI1">Resolution:</div>
  <div class="eI2">0.1&deg; x 0.1&deg; (Europa)<br>
  0.5&deg; x 0.5&deg;</div>
 </div>
 <div class="eI0">
  <div class="eI1">par&acirc;metro:</div>
  <div class="eI2">Cloud cover (low,middle,high,total)</div>
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 <div class="eI0">
  <div class="eI1">Descri&ccedil;&atilde;o:</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.
<br>

    
  </div>
 </div>
 <div class="eI0">
  <div class="eI1">Arp&egrave;ge:</div>
  <div class="eI2"><a href="http://www.cnrm.meteo.fr/spip.php?article121/" target="_blank">Arp&egrave;ge</a> <br>
ARPEGE uses a set of primitive equations with a triangular spectral truncation on the horizontal, with a variable horizontal resolution, with a finite elements representation on the vertical and a “sigma-pressure” hybrid vertical coordinate. It also utilizes a temporal two time level semi-implicit semi-lagrangian scheme. The horizontal resolution of the ARPEGE model is around 7.5km over France and 37km over the Antipodes. It has 105 vertical levels, with the first level at 10m above the surface and an upper level at around 70km. Its time step is of 360 seconds.</br>
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 <div class="eI0">
  <div class="eI1">NWP:</div>
  <div class="eI2">A previs&atilde;o num&eacute;rica do tempo usa o estado instant&acirc;neo da atmosfera como dados de entrada para modelos matem&aacute;ticos da atmosfera, com vista &agrave; previs&atilde;o do estado do tempo.<br>
Apesar dos primeiros esforços para conseguir prever o tempo tivessem sido dados na d&eacute;cada de 1920, foi apenas com o advento da era dos computadores que foi possível realiz&aacute;-lo em tempo real. A manipulaç&atilde;o de grandes conjuntos de dados e a realizaç&atilde;o de c&aacute;lculos complexos para o conseguir com uma resoluç&atilde;o suficientemente elevada para produzir resultados úteis requer o uso dos supercomputadores mais potentes do mundo. Um conjunto de modelos de previs&atilde;o, quer &agrave; escala global quer &agrave; escala regional, s&atilde;o executados para criar previsões do tempo nacionais. O uso de previsões com modelos semelhantes ("model ensembles") ajuda a definir a incerteza da previs&atilde;o e estender a previs&atilde;o do tempo bastante mais no futuro, o que n&atilde;o seria possível conseguir de outro modo.<br>
<br>Contribuidores da Wikip&eacute;dia, "Previs&atilde;o num&eacute;rica do tempo," Wikip&eacute;dia, a enciclop&eacute;dia livre, <a href="http://pt.wikipedia.org/w/index.php?title=Previs%C3%A3o_num%C3%A9rica_do_tempo&amp;oldid=17351675" target="_blank">http://pt.wikipedia.org/w/index.php?title=Previs%C3%A3o_num%C3%A9rica_do_tempo&oldid=17351675</a> (accessed fevereiro 9, 2010). <br>
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