<div dir="ltr">If you're calculating 0-1 km SRH over flat terrain near sea level, their computation is within reason. However, if you're on higher terrain or sloped terrain (e.g., the Plains region of the US), you'll want to use a different method.<div>
<br>Jeff</div></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Sat, Sep 7, 2013 at 11:28 AM, Nimrod Micael <span dir="ltr"><<a href="mailto:nmicael@aggies.ncat.edu" target="_blank">nmicael@aggies.ncat.edu</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">He stated it's 1 KM MSL.<div><br></div><div><br><div><br></div><div><span style="font-family:arial,sans-serif;font-size:13px">"However, the question of AGL or MSL depends on your model data output -</span><br style="font-family:arial,sans-serif;font-size:13px">
<span style="font-family:arial,sans-serif;font-size:13px">if it compensates the pressure height. GFS IIRC does not do that, so it</span><br style="font-family:arial,sans-serif;font-size:13px"><span style="font-family:arial,sans-serif;font-size:13px">would be MSL.</span><br style="font-family:arial,sans-serif;font-size:13px">
<br style="font-family:arial,sans-serif;font-size:13px"><span style="font-family:arial,sans-serif;font-size:13px">To understand the calculation, you can check the original math from our</span><br style="font-family:arial,sans-serif;font-size:13px">
<span style="font-family:arial,sans-serif;font-size:13px">website:</span><br style="font-family:arial,sans-serif;font-size:13px"><a href="http://www.saakeskus.fi/grads-scripts/63-storm-relative-helicity-0-3km" style="font-family:arial,sans-serif;font-size:13px" target="_blank">http://www.saakeskus.fi/grads-scripts/63-storm-relative-helicity-0-3km</a>"<br>
</div></div><div><br></div><div>So in order to calculate 0-1 KM shear it has to be 0-1 KM AGL?</div><div><br></div><div><br></div><div>Thanks.</div><div><br></div><div><br></div></div><div class="gmail_extra"><br><br><div class="gmail_quote">
On Fri, Sep 6, 2013 at 1:30 PM, Jeff Duda <span dir="ltr"><<a href="mailto:jeffduda319@gmail.com" target="_blank">jeffduda319@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="ltr">I don't use openGrads, so there may be some specifics I'm not aware of. uVAR and vVAR are just dummy names for the u- and v-components of the wind. The inaccuracies are probably due to the exact specifics with how the 0-1 km shear is computed in the script. One big question is how is the 1 km layer wind field being computed? Is it just 1 km MSL or 1 km AGL? Those are things you need to find out. I recommend asking the authors whose email addresses are given on the linked page.<br>
<br>Jeff<br></div><div class="gmail_extra"><br><br><div class="gmail_quote"><div><div>On Fri, Sep 6, 2013 at 12:20 PM, Nimrod Micael <span dir="ltr"><<a href="mailto:nmicael@aggies.ncat.edu" target="_blank">nmicael@aggies.ncat.edu</a>></span> wrote:<br>
</div></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div><div dir="ltr"><h2 style="color:rgb(147,125,0);font-size:16px;font-family:'bitstream vera sans',verdana,sans-serf">
<a name="140f945daa5b8bb2_140f4534ed44620b_140f44d21cee3a1f_srh1km_uvar_vvar_"><strong>srh1km</strong>(<em>uVAR,vVAR</em>)</a></h2><div>What is uVAR and vVAR? I dont have those variables. </div>
<div><br></div><div><a href="http://opengrads.org/doc/udxt/saakeskus/" target="_blank">http://opengrads.org/doc/udxt/saakeskus/</a><br></div><div><br></div><div>I tried replacing uVar and vVar with u and v wind but I am getting some inaccuracies with the 0-1 KM shear. Can someone help me out?</div>
<div><br></div><div>Thanks. </div><span><font color="#888888"><div><br></div>-- <br>Nimrod Micael
</font></span></div>
<br></div></div>_______________________________________________<br>
gradsusr mailing list<br>
<a href="mailto:gradsusr@gradsusr.org" target="_blank">gradsusr@gradsusr.org</a><br>
<a href="http://gradsusr.org/mailman/listinfo/gradsusr" target="_blank">http://gradsusr.org/mailman/listinfo/gradsusr</a><br>
<br></blockquote></div><span><font color="#888888"><br><br clear="all"><span class="HOEnZb"><font color="#888888"><br>-- <br>Jeff Duda<br>Graduate research assistant<br>University of Oklahoma School of Meteorology<br>Center for Analysis and Prediction of Storms<br>
</font></span></font></span></div><span class="HOEnZb"><font color="#888888">
<br>_______________________________________________<br>
gradsusr mailing list<br>
<a href="mailto:gradsusr@gradsusr.org" target="_blank">gradsusr@gradsusr.org</a><br>
<a href="http://gradsusr.org/mailman/listinfo/gradsusr" target="_blank">http://gradsusr.org/mailman/listinfo/gradsusr</a><br>
<br></font></span></blockquote></div><span class="HOEnZb"><font color="#888888"><br><br clear="all"><div><br></div>-- <br>Nimrod Micael
</font></span></div>
<br>_______________________________________________<br>
gradsusr mailing list<br>
<a href="mailto:gradsusr@gradsusr.org">gradsusr@gradsusr.org</a><br>
<a href="http://gradsusr.org/mailman/listinfo/gradsusr" target="_blank">http://gradsusr.org/mailman/listinfo/gradsusr</a><br>
<br></blockquote></div><br><br clear="all"><div><br></div>-- <br>Jeff Duda<br>Graduate research assistant<br>University of Oklahoma School of Meteorology<br>Center for Analysis and Prediction of Storms<br>
</div>