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</o:shapelayout></xml><![endif]--></head><body lang=ES-CL link=blue vlink=purple><div class=WordSection1><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Dear all,<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>I'm modelling a urban area (Santiago de Chile) with high topographic resolution (1km). Santiago is located in a zone with very complex terrain, surface average winds are very low. <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>WRF overestimates wind speed when comparing with surface observations as expected.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>I'm using four nested domains, 3:1 ratio.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>I'm trying to run the model with sf_urban_physics = 1 (urban canopy) and the model runs well during spring and summer months, estimating lower wind speeds in comparison to the former case, but crashes during the winter months and some of the autumn months. I also tested sf_urban_physics = 2 and I got the same problem. The rsl.out file gives no error messages, even when using debug = 100. I've tried WRF version 3.7 and version 3.8.1, I've tested different ETA level configurations, reducing the ZR value in the URBPARM.TBL file, increasing p_top_requested to 10000 from 5000, I've tried different sizes of the 1 km domain, avoiding complex terrain on the domain borders, I've tried the ACM2 PBL and MYJ PBL options, etc, but all these tests didn't work.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>I would welcome any recommendations<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Many thanks <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p></div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><table class=MsoNormalTable border=0 cellspacing=0 cellpadding=0 align=left style='border-collapse:collapse;margin-left:-2.25pt'><tr style='height:11.3pt'><td width=552 colspan=2 valign=top style='width:414.25pt;padding:0in 5.4pt 0in 5.4pt;height:11.3pt'><p class=MsoNormal style='mso-element:frame;mso-element-wrap:around;mso-element-anchor-vertical:paragraph;mso-element-anchor-horizontal:column;mso-height-rule:exactly'><b><span style='font-size:9.0pt;font-family:"Verdana","sans-serif";color:#0068B3'>Julio Castro M.</span></b><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p></o:p></span></p><p class=MsoNormal style='mso-element:frame;mso-element-wrap:around;mso-element-anchor-vertical:paragraph;mso-element-anchor-horizontal:column;mso-height-rule:exactly'><span style='font-size:8.0pt;font-family:"Verdana","sans-serif";color:#0068B3'>Ingeniero Civil, MSc., PhD.</span><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:black'><o:p></o:p></span></p></td></tr><tr style='height:11.3pt'><td width=552 colspan=2 valign=top style='width:414.25pt;padding:0in 5.4pt 0in 5.4pt;height:11.3pt'><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;line-height:11.3pt;mso-element:frame;mso-element-wrap:around;mso-element-anchor-vertical:paragraph;mso-element-anchor-horizontal:column;mso-height-rule:exactly'><span style='font-size:8.0pt;font-family:"Verdana","sans-serif";color:#0068B3'>Jefe del Área de Modelación y Calidad del Aire</span><span style='font-size:8.0pt;font-family:"Calibri","sans-serif";color:black'><o:p></o:p></span></p></td></tr><tr style='height:69.95pt'><td width=213 style='width:159.55pt;padding:0in 5.4pt 0in 5.4pt;height:69.95pt'><p class=MsoNormal style='mso-element:frame;mso-element-wrap:around;mso-element-anchor-vertical:paragraph;mso-element-anchor-horizontal:column;mso-height-rule:exactly'><span style='font-size:11.0pt;font-family:"Verdana","sans-serif";color:#0068B3'><img width=202 height=75 id="Imagen_x0020_2" src="cid:image001.png@01D265B3.3C3EB6A0" alt="cid:83969B68-5B60-49B4-AE8A-CFDE16B1D669"></span><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p></o:p></span></p></td><td width=340 style='width:254.7pt;padding:0in 5.4pt 0in 5.4pt;height:69.95pt'><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-element:frame;mso-element-wrap:around;mso-element-anchor-vertical:paragraph;mso-element-anchor-horizontal:column;mso-height-rule:exactly'><span style='font-size:7.5pt;font-family:"Verdana","sans-serif";color:#0068B3'>Padre Mariano 103, Of. 307<br>Providencia, Santiago<br>Fono: +56 2 27195 610<br>Fax: +56 2 22351 100<br></span><span style='font-family:"Calibri","sans-serif";color:#1F497D'><a href="http://www.gac.cl/" title="blocked::http://www.gac.cl/"><span style='font-size:7.5pt;font-family:"Verdana","sans-serif";color:#0068B3'>www.gac.cl</span></a></span><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:black'><o:p></o:p></span></p></td></tr></table><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> <o:p></o:p></span></p></div></body></html>