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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal>I have a few questions about using OBS nudging in WRF v3.3. I’m using the 12km NAM data, which comes in 6 hour intervals. WPS ran fine, and I have met_em files every 6 hours.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I have processed MADIS data to little_r format, and named the files OBS:YYYY-MM-DD_HH. Each file contains 6 hours of data, which I’ve confirmed via grep (e.g. “grep 200801 OBS:2008-01-29_18 | cut -c 327-336 | sort | uniq” shows the right time-stamps).<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>1. OBSGRID.EXE creates OBS_DOMAIN101, OBSDOMAIN102, etc. But each file contains only ONE hour’s data (the analysis hour +/- 30 minutes). The OBS data for the next 5 hours is not output. How can I get OBSGRID.EXE to create OBS_DOMAIN1* files that contain ALL the available data? I want to nudge every hour, not every 6 hours.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>2. The most recent notes in the <a href="http://www.mmm.ucar.edu/wrf/users/wrfv3.1/How_to_run_obs_fdda.html">WRF User’s Guide</a> make no mention having to concatenate the OBS_DOMAIN1* output from OBSGRID.EXE to OBS_DOMAIN101, but the <a href="http://www.mmm.ucar.edu/wrf/OnLineTutorial/Class/cases/obs_nudging1.php">tutorial notes</a> do say so. Which is correct? Will WRF not read OBS_DOMAIN102, OBS_DOMAIN103, etc.?<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>3. If I want to nudge every hour, do I set auxinput11_interval_m = 60 in WRF’s namelist? Or is that supposed to match OBSGRID’s record1 interval ?<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>4. If I want to keep nudging till the very end of my simulation, can I set auxinput11_end_h = 99999? <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>The meaning of these two values is pretty unclear in the README.namelist, README.obs_fdda, as well as the WRF User’s Guide and tutorial notes. If anyone can shed some light, I’d be most appreciative.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Thanks,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Bart<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p></div>
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