<div dir="ltr">I dont know why I am getting this error. <div><br></div><div><div>Unknown command: u0.5=zinterp(u,height,0.5)</div><div>Unknown command: v0.5=zinterp(v,height,0.6)</div><div>Done. Newly defined variable interp has 1 v-field.</div>
<div>Done. Newly defined variable interp has 1.5 u-field.</div><div>DEFINE error: Name too long; missing '='</div><div>Done. Newly defined variable interp has 1.5 v-field.</div><div>DEFINE error: Name too long; missing '='</div>
<div>Done. Newly defined variable interp has 2 u-field.</div><div>Done. Newly defined variable interp has 2 v-field.</div><div>Done. Newly defined variable interp has 2.5 u-field.</div><div>DEFINE error: Name too long; missing '='</div>
<div>Done. Newly defined variable interp has 2.5 v-field.</div><div>DEFINE error: Name too long; missing '='</div><div>Done. Newly defined variable interp has 3 u-field.</div><div>Done. Newly defined variable interp has 3 v-field.</div>
<div>Done. Newly defined variable interp has 3.5 u-field.</div><div>DEFINE error: Name too long; missing '='</div><div>Done. Newly defined variable interp has 3.5 v-field.</div><div>DEFINE error: Name too long; missing '='</div>
<div>Done. Newly defined variable interp has 4 u-field.</div><div>Done. Newly defined variable interp has 4 v-field.</div><div>Done. Newly defined variable interp has 4.5 u-field.</div><div>DEFINE error: Name too long; missing '='</div>
<div>Done. Newly defined variable interp has 4.5 v-field.</div><div>DEFINE error: Name too long; missing '='</div><div>Done. Newly defined variable interp has 5 u-field.</div><div>Done. Newly defined variable interp has 5 v-field.</div>
<div>Done. Newly defined variable interp has 5.5 u-field.</div><div>DEFINE error: Name too long; missing '='</div><div>Done. Newly defined variable interp has 5.5 v-field.</div><div>DEFINE error: Name too long; missing '='</div>
<div>Done. Newly defined variable interp has 6 u-field.</div><div>Done. Newly defined variable interp has 6 v-field.</div><div>Data Request Error: File number out of range</div><div> Variable = u0.5</div><div> Error ocurred at column 6</div>
<div>DEFINE error: Invalid expression.</div></div><div><br></div><div><br></div><div>Here's my code:</div><div><br></div><div><br></div><div><div>"u0.5=zinterp(u,height,0.5)"</div><div><br></div><div>"v0.5=zinterp(v,height,0.6)"</div>
<div><br></div><div>"u1=zinterp(u,height,1)"</div><div><br></div><div>"define v1="zinterp(v,height,1)</div><div><br></div><div>"define u1.5="zinterp(u,height,1.5)</div><div><br></div><div><br>
</div><div>"define v1.5="zinterp(v,height,1.5)</div><div><br></div><div><br></div><div>"define u2="zinterp(u,height,2)</div><div><br></div><div><br></div><div>"define v2="zinterp(v,height,2)</div>
<div><br></div><div><br></div><div>"define u2.5="zinterp(u,height,2.5)</div><div><br></div><div><br></div><div>"define v2.5="zinterp(v,height,2.5)</div><div><br></div><div><br></div><div>"define u3="zinterp(u,height,3)</div>
<div><br></div><div><br></div><div>"define v3="zinterp(v,height,3)</div><div><br></div><div><br></div><div>"define u3.5="zinterp(u,height,3.5)</div><div><br></div><div><br></div><div>"define v3.5="zinterp(v,height,3.5)</div>
<div><br></div><div>"define u4 ="zinterp(u,height,4)</div><div><br></div><div><br></div><div>"define v4="zinterp(v,height,4)</div><div><br></div><div><br></div><div>"define u4.5="zinterp(u,height,4.5)</div>
<div><br></div><div><br></div><div>"define v4.5="zinterp(v,height,4.5)</div><div><br></div><div><br></div><div>"define u5="zinterp(u,height,5)</div><div><br></div><div><br></div><div>"define v5="zinterp(v,height,5)</div>
<div><br></div><div><br></div><div>"define u5.5="zinterp(u,height,5.5)</div><div><br></div><div><br></div><div>"define v5.5="zinterp(v,height,5.5)</div><div><br></div><div><br></div><div>"define u6="zinterp(u,height,6)</div>
<div><br></div><div>"define v6="zinterp(v,height,6)</div><div><br></div><div>'define umean=(u10+u0.5+u1+u1.5+u2+u2.5+u3.0+u3.5+u4+u4.5+u5+u5.5+u6)/13.0'</div><div>'define vmean=(v10+v0.5+v1+v1.5+v2+v2.5+v3.0+v3.5+v4+v4.5+v5+v5.5+v6)/13.0'</div>
<div>'define ushear=u5-u10'</div><div>'define vshear=v5-v10'</div><div>'define shear=sqrt(ushear*ushear+vshear*vshear)'</div><div>'define umotion=((umean+(7.5/(shear))*vshear))'</div><div>'define vmotion=((vmean-(7.5/(shear))*ushear))'</div>
<div>'define srh1=((u0.5-umotion)*(v10-vmotion)-(u10-umotion)*(v0.5-vmotion))'</div><div>'define srh2=((u1-umotion)*(v0.5-vmotion)-(u0.5-umotion)*(v1-vmotion))'</div><div>'define srh1km=srh1+srh2'</div>
<div><br></div><div>'set gxout shaded'</div><div>'set clevs 100 150 200 250 300 400 500 600 700 800'</div><div>'set ccols 0 14 4 11 5 3 7 12 8 2 6'</div><div>'d srh1km'</div></div><div><br>
</div><div>I dont get what's wrong? </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 Sat, Sep 7, 2013 at 4:50 PM, 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">Just change it to height coordinates from that script? </div><div class="gmail_extra"><div><div class="h5">
<br><br><div class="gmail_quote">On Sat, Sep 7, 2013 at 4:49 PM, 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">I see... so how would the shear from Surface to 1 km AGL be calculated? I cant find it online. <div><br>
</div><div>Thanks!</div></div><div><div><div class="gmail_extra"><br><br><div class="gmail_quote">On Sat, Sep 7, 2013 at 3:45 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">Because in areas of elevated terrain, the top of the layer in which the shear is being computed is much closer to the surface than 1 km. Said another way, they use the 900 mb level as a surrogate for the 1 km level. If the actual surface pressure is close to 900 mb, however, the vertical distance between the surface and the surrogate 1 km level is going to be quite small. Thus, the computed shear value will be expected to be lower than if you used the 1 km AGL instead.<span><font color="#888888"><div>
<br></div><div>Jeff</div></font></span></div><div><div><div class="gmail_extra"><br><br><div class="gmail_quote">On Sat, Sep 7, 2013 at 1:47 PM, 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">@Jeff: <div><br></div><div>Ok because I find it weird that my 0-1 KM shear values at 16Z in GSO is about 1/2 of the value of the observation from a sounding taken at the time when using that shr1km(u,v) function. However, when I used Rob Hart's plotskew script to plot the sounding...the ERSH matched closer to the observation at that time. So I am wondering why such a huge error in that. </div>
</div><div class="gmail_extra"><br><br><div class="gmail_quote">On Sat, Sep 7, 2013 at 2:08 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">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.<span><font color="#888888"><div>
<br>Jeff</div></font></span></div><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="140fa31109422b8a_140fa302f6f692dd_140f9f56f216ea7a_140f9c210c615c15_140f99c64d0502a2_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>
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<br></blockquote></div><span><font color="#888888"><br><br clear="all"><span><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><font color="#888888">
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<br></font></span></blockquote></div><span><font color="#888888"><br><br clear="all"><div><br></div>-- <br>Nimrod Micael
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<br></blockquote></div><br><br clear="all"><span><font color="#888888"><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>
</font></span></div><span><font color="#888888">
</font></span></div></div><span><font color="#888888"><br>_______________________________________________<br>
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<br></font></span></blockquote></div><span><font color="#888888"><br><br clear="all"><div><br></div>-- <br>Nimrod Micael
</font></span></div>
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<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>
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<br></blockquote></div><br><br clear="all"><div><br></div>-- <br>Nimrod Micael
</div>
</div></div></blockquote></div><br><br clear="all"><div><br></div></div></div><span class="HOEnZb"><font color="#888888">-- <br>Nimrod Micael
</font></span></div>
</blockquote></div><br><br clear="all"><div><br></div>-- <br>Nimrod Micael
</div>