Hi there,<br><br>As I am to understand, WRF rotates earth winds to grid winds during the simulation. However two variables in the output are sinalpha and cosalpha. In order to rotate back the output u and v components to earth relative, you have to use the equations found in the link I am including hereunder<br>
<br><a href="http://forum.wrfforum.com/viewtopic.php?f=8&t=3225">http://forum.wrfforum.com/viewtopic.php?f=8&t=3225</a><br><br>Good luck, hope this helps. <br><br>Jason<br><br><div class="gmail_quote">On Wed, Apr 11, 2012 at 9:03 AM, Rambler <span dir="ltr"><<a href="mailto:soleiman@rambler.ru">soleiman@rambler.ru</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hello to all<br>
Could some one explain me the wind u and v components in grib files which made by WRF WPP is rotated to the earth coordinate ( north, east) or in grid direction (x, y) ? Also they are in mass point or not?<br>
Thanks.<br>
<br>
Best regards,<br>
Suleiman Mostamandy<br>
<br>
<br>
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