<div class="eI0"> <div class="eI1">Modèle:</div> <div class="eI2"><h2><a href="http://www.nrlmry.navy.mil/coamps-web/web/view?spg=1" target="_blank">COAMPS</a>: The Naval Research Laboratory's Coupled Ocean/Atmosphere Mesoscale Prediction System (COAMPS<sup>®</sup>)</h2></div> </div> <div class="eI0"> <div class="eI1">Mise à jour:</div> <div class="eI2">2 times per day, from 10:00 and 23:00 UTC</div> </div> <div class="eI0"> <div class="eI1">Greenwich Mean Time:</div> <div class="eI2">12:00 UTC = 13:00 CET</div> </div> <div class="eI0"> <div class="eI1">Résolution:</div> <div class="eI2">0.2° x 0.2°</div> </div> <div class="eI0"> <div class="eI1">Paramètre:</div> <div class="eI2">Lifted Index</div> </div> <div class="eI0"> <div class="eI1">Description:</div> <div class="eI2"> <!--begin info text LI--> <p> The Lifted Index (LI) is defined as a rising parcel's temperature when it reaches the 500 millibars level (at about 5,500m or 18,000 feet asl), subtracted from the actual temperature of the environmental air at 500 mbar. If the Lifted Index is a large negative number, then the parcel will be much warmer than its surroundings, and will continue to rise. Thunderstorms are fueled by strong rising air, thus the Lifted Index is a good measurement of the atmosphere's potential to produce severe thunderstorms. </p> <p> <!--begin LI table--> <body> <table width="400" cellspacing="0" cellpadding="0" border="0"> <tr height="30" bgcolor="#E5E5E5"><!-- Row 1 --> <td colspan="4"><font size="3" face="Arial, Helvetica" color="#0000FF">The Lifted Index (LI)</td> </tr> <tr height="30"><!-- Row 2 --> <td width="17%" valign="top"><font size="1" face="Arial, Helvetica"><center>RANGE IN K</center></td> <td bgcolor="#E5E5E5" width="20%" valign="top"><font size="1" face="Arial, Helvetica"><center>COLOR</center></td> <td width="30%" valign="top"><font size="1" face="Arial, Helvetica"><center>AMOUNT OF INSTABILITY</center></td> <td widht="33%" valign="top"><font size="1" face="Arial, Helvetica"><center>THUNDERSTORM PROBABILITY</center></td> </tr> <tr height="25" bgcolor="#E5E5E5"><!-- Row 3 --> <td valign="top"><font size="1" face="Arial, Helvetica"><center>more than 11</center></td> <td valign="top"><font size="1" face="Arial, Helvetica" color="#00A1E6"><center>BLUE</center></td> <td valign="top"><font size="1" face="Arial, Helvetica"><center>Extremely stable conditions</center></td> <td valign="top"><font size="1" face="Arial, Helvetica"><center>Thunderstorms unlikely</center></td> </tr> <tr height="25"><!-- Row 4 --> <td valign="top"><font size="1" face="Arial, Helvetica"><center>8 to 11</center></td> <td bgcolor="#E5E5E5" valign="top"><font size="1" face="Arial, Helvetica" color="#00C7C7"><center>LIGHT BLUE</center></td> <td valign="top"><font size="1" face="Arial, Helvetica"><center>Very stable conditions</center></td> <td valign="top"><font size="1" face="Arial, Helvetica"><center>Thunderstorms unlikely</center></td> </tr> <tr height="25" bgcolor="#E5E5E5"><!-- Row 5 --> <td valign="top"><font size="1" face="Arial, Helvetica"><center>4 to 7</center></td> <td bgcolor="#E5E5E5" valign="top"><font size="1" face="Arial, Helvetica" color="#00D18C"><center>GREEN</center></td> <td valign="top"><font size="1" face="Arial, Helvetica"><center>Stable conditions</center></td> <td valign="top"><font size="1" face="Arial, Helvetica"><center>Thunderstorms unlikely</center></td> </tr> <tr height="25"><!-- Row 6 --> <td valign="top"><font size="1" face="Arial, Helvetica"><center>0 to 3</center></td> <td bgcolor="#E5E5E5"valign="top"><font size="1" face="Arial, Helvetica" color="#A1E633"><center>LIGHT GREEN</center></td> <td valign="top"><font size="1" face="Arial, Helvetica"><center>Mostly stable conditions</center></td> <td valign="top"><font size="1" face="Arial, Helvetica"><center>Thunderstorm unlikely</center></td> </tr> <tr height="25" bgcolor="#E5E5E5"><!-- Row 7 --> <td valign="top"><font size="1" face="Arial, Helvetica"><center>-3 to -1</center></td> <td bgcolor="#E5E5E5" valign="top"><font size="1" face="Arial, Helvetica" color="#E6DC33"><center>YELLOW</center></td> <td valign="top"><font size="1" face="Arial, Helvetica"><center>Slightly unstable</center></td> <td valign="top"><font size="1" face="Arial, Helvetica"><center>Thunderstorms possible</center></td> </tr> <tr height="25"><!-- Row 8 --> <td valign="top"><font size="1" face="Arial, Helvetica"><center>-5 to -4</center></td> <td bgcolor="#E5E5E5" valign="top"><font size="1" face="Arial, Helvetica" color="#F08229"><center>ORANGE</center></td> <td valign="top"><font size="1" face="Arial, Helvetica"><center>Unstable</center></td> <td valign="top"><font size="1" face="Arial, Helvetica"><center>Thunderstorms probable</center></td> </tr> <tr height="25" bgcolor="#E5E5E5"><!-- Row 9 --> <td valign="top"><font size="1" face="Arial, Helvetica"><center>-7 to -6</center></td> <td bgcolor="#E5E5E5" valign="top"><font size="1" face="Arial, Helvetica" color="#F00000"><center>RED</center></td> <td valign="top"><font size="1" face="Arial, Helvetica"><center>Highly unstable</center></td> <td valign="top"><font size="1" face="Arial, Helvetica"><center>Severe thunderstorms possible</center></td> </tr> <tr height="25"><!-- Row 10 --> <td valign="top"><font size="1" face="Arial, Helvetica"><center>less than -7</td> <td bgcolor="#E5E5E5" valign="top"><font size="1" face="Arial, Helvetica" color="#FF00FF"><center>VIOLET</td> <td valign="top"><font size="1" face="Arial, Helvetica"><center>Extremely unstable</td> <td valign="top"><font size="1" face="Arial, Helvetica"><center>Violent thunderstorms, tornadoes possible</td> </tr> </table> <!--end LI table--> </p> <!--end info_text LI--> </div> </div> <div class="eI0"> <div class="eI1">COAMPS:<sup>®</sup></div> <div class="eI2">The Coupled Ocean/Atmosphere Mesoscale Prediction System (COAMPS<sup>®</sup>) has been developed by the Marine Meteorology Division (MMD) of the Naval Research Laboratory (NRL). The atmospheric components of COAMPS<sup>®</sup>, described below, are used operationally by the U.S. Navy for short-term numerical weather prediction for various regions around the world.<br> <br> The atmospheric portion of COAMPS<sup>®</sup> represents a complete three-dimensional data assimilation system comprised of data quality control, analysis, initialization, and forecast model components. Features include a globally relocatable grid, user-defined grid resolutions and dimensions, nested grids, an option for idealized or real-time simulations, and code that allows for portability between mainframes and workstations. The nonhydrostatic atmospheric model includes predictive equations for the momentum, the non-dimensional pressure perturbation, the potential temperature, the turbulent kinetic energy, and the mixing ratios of water vapor, clouds, rain, ice, grauple, and snow, and contains advanced parameterizations for boundary layer processes, precipitation, and radiation. </div></div> <div class="eI0"> <div class="eI1">NWP:</div> <div class="eI2">La prévision numérique du temps (PNT) est une application de la météorologie et de l'informatique. Elle repose sur le choix d'équations mathématiques offrant une proche approximation du comportement de l'atmosphère réelle. Ces équations sont ensuite résolues, à l'aide d'un ordinateur, pour obtenir une simulation accélérée des états futurs de l'atmosphère. Le logiciel mettant en œuvre cette simulation est appelé un modèle de prévision numérique du temps.<br><br> <br>Prévision numérique du temps. (2009, décembre 12). Wikipédia, l'encyclopédie libre. Page consultée le 20:48, février 9, 2010 à 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> </div></div> </div>