<html><body><div style="color:#000; background-color:#fff; font-family:times new roman, new york, times, serif;font-size:12pt"><div id="yiv32617686"><div><div style="color: rgb(0, 0, 0); background-color: rgb(255, 255, 255); font-family: times new roman,new york,times,serif; font-size: 12pt;"><div id="yiv32617686"><div><div style="color: rgb(0, 0, 0); background-color: rgb(255, 255, 255); font-family: times new roman,new york,times,serif; font-size: 12pt;"><div>hi
<br></div><div id="yiv32617686"><div><div style="color: rgb(0, 0, 0); background-color: rgb(255, 255, 255); font-family: times new roman,new york,times,serif; font-size: 12pt;"><div><span lang="en"><span>I</span> <span>am</span>
<span>a
student</span>
<span>Climatology.<br></span></span><span lang="en"><span>Wanted to
grads script calculate <span class="yshortcuts" id="lw_1354777594_0">potential
vorticity</span></span><span>.</span>
<span>With</span> <span>an</span> <span>example for 20 jun 1962,level
500hp. </span></span><span id="yiv32617686result_box" class="yiv32617686short_text" lang="en"><span class="yiv32617686hps">I
need</span> <span class="yiv32617686hps">to</span> <span class="yiv32617686hps">have</span> <span class="yiv32617686hps">the
potential</span> <span class="yiv32617686hps">vorticity data.</span></span><span id="yiv32617686result_box" class="yiv32617686short_text" lang="en"><span class="yiv32617686hps">Where</span>
<span class="yiv32617686hps">can I get</span><span class="yiv32617686">?</span></span><br><span id="yiv32617686result_box" class="yiv32617686" lang="en"><span class="yiv32617686hps">I</span> <span class="yiv32617686hps">need</span>
</span><span id="yiv32617686result_box" class="yiv32617686" lang="en"><span class="yiv32617686hps">potential vorticity</span> <span class="yiv32617686hps">data</span></span><span id="yiv32617686result_box" class="yiv32617686" lang="en"><span class="yiv32617686hps"> for pressure</span> </span><span id="yiv32617686result_box" class="yiv32617686" lang="en"> <span class="yiv32617686hps"></span></span><span id="yiv32617686result_box" class="yiv32617686" lang="en"><span class="yiv32617686hps">level</span> <span class="yiv32617686hps"></span></span><span id="yiv32617686result_box" class="yiv32617686" lang="en"><span class="yiv32617686hps"></span><span>.</span>
<span class="yiv32617686hps"><br></span></span><div style="color: rgb(0, 0, 0); font-size: 16px; font-family: times new roman,new york,times,serif; background-color: transparent; font-style: normal;"><span id="yiv32617686result_box" class="yiv32617686" lang="en"><span class="yiv32617686hps">but Site data</span>(ncep/ncar)<span class="yiv32617686hps">are</span> sigma<span class="yiv32617686hps"></span> <span class="yiv32617686hps">levels</span><span class="yiv32617686">.</span></span></div><div style="color: rgb(0, 0, 0); font-size: 16px; font-family: times new roman,new york,times,serif; background-color: transparent; font-style: normal;"><span id="yiv32617686result_box" class="yiv32617686" lang="en"><span class="yiv32617686"> How I can convert variables in sigma to
pressure<br>for nc data?</span></span></div><div style="color: rgb(0, 0, 0); font-size: 16px; font-family: times new roman,new york,times,serif; background-color: transparent; font-style: normal;"><span id="yiv32617686result_box" class="yiv32617686" lang="en"><span class="yiv32617686hps">6e +06 or-5e
+06</span> <span class="yiv32617686hps">What</span> <span class="yiv32617686hps"></span><span class="yiv32617686hps"></span><span class="yiv32617686hps"></span><span class="yiv32617686"></span></span><span id="yiv32617686result_box" class="yiv32617686short_text" lang="en"><span class="yiv32617686hps">Analysis</span>
<span class="yiv32617686hps"></span></span><span id="yiv32617686result_box" class="yiv32617686" lang="en"><span class="yiv32617686hps">is</span> <span class="yiv32617686hps">the </span></span><span id="yiv32617686result_box" class="yiv32617686short_text" lang="en"><span class="yiv32617686hps">the</span> <span class="yiv32617686hps">potential
vorticity</span> <span class="yiv32617686hps">maps</span><span class="yiv32617686">?</span></span></div><br><span lang="en"><span>Thanks
in
advanc</span></span></div></div></div></div></div></div></div></div></div></div></div></body></html>