<div dir="ltr">Hi Pau,<div><br></div><div>If you run one of the DFI variants that involves a backward, adiabatic integration at such a high resolution you can run into instability issues. I suggest keeping the filter window length short and making the filter timestep short as well. For reference, here is what we use for the operational 3km NAM CONUS Nest at NOAA/NCEP/EMC:</div><div><br></div><blockquote style="margin:0 0 0 40px;border:none;padding:0px"><div><div>##########################################</div></div><div><div>##### Fundamental Timestep (seconds) #####</div></div><div><div>##########################################</div></div><div><div><br></div></div><div><div>dt_int: 6 # Integer seconds</div></div><div><div>dt_num: 1 # Numerator of fractional second</div></div><div><div>dt_den: 4 # Denominator of fractional second</div></div><div><div><br></div></div><div><div>filt_dt_int: 2 # Integer seconds</div></div><div><div>filt_dt_num: 0 # Numerator of fractional second</div></div><div><div>filt_dt_den: 4 # Denominator of fractional second</div></div><div><br></div><div><br></div><div><div>###################################</div></div><div><div>##### Digital Filtering options ###</div></div><div><div>###################################</div></div><div><div><br></div></div><div><div>filter_method: 3 # 0--->none ; 1--->DFL ; 2---> DDFI ; 3--->TDFI</div></div><div><div><br></div></div><div><div>nsecs_dfl: 1800 # HALF foward filter window (s) (DFL)</div></div><div><div>nsecs_bckddfi: 1800 # HALF backward integration duration (s) (DDFI)</div></div><div><div>nsecs_fwdddfi: 3600 # HALF foward filter window (s) (DDFI)</div></div><div><div>nsecs_bcktdfi: 600 # HALF backward filter window (s) (TDFI)</div></div><div><div>nsecs_fwdtdfi: 600 # HALF forward filter window (s) (TDFI)</div></div></blockquote><div><br></div>Hope this helps!<div>Jacob<br><div><br></div></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Fri, Apr 20, 2018 at 6:30 AM, Marco Biordi <span dir="ltr"><<a href="mailto:marco.biordi@gmail.com" target="_blank">marco.biordi@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"><div><div>We're using 3600.<br><br></div>Anyway keep this value to be an integer multiple of the time step, elsewhere give error.<span class="HOEnZb"><font color="#888888"><br><br></font></span></div><span class="HOEnZb"><font color="#888888">Marco<br></font></span></div><div class="HOEnZb"><div class="h5"><div class="gmail_extra"><br><div class="gmail_quote">2018-04-20 9:50 GMT+00:00 Pau <span dir="ltr"><<a href="mailto:pescribaa@aemet.es" target="_blank">pescribaa@aemet.es</a>></span>:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div text="#000000" bgcolor="#FFFFFF">
<p>Hi Marco,</p>
<p>Thanks very much for the answer, we are going to test it right
now.</p>
<p>We should see if DFI changes our verification scores but I would
expect it doesn't, taking into account we are not doing analysis
cycling with NMMB. <br>
</p>
<p>Just a small question, apart from filter_method=3, are using the
regular values for filtering parameters:</p>
<p>nsecs_bcktdfi: 3600 # HALF backward filter window
(s) (TDFI)<br>
nsecs_fwdtdfi: 3600 # HALF forward filter window
(s) (TDFI)<br>
</p>
<p>?</p>
<p>In our case we are running with around 2.5 km horizontal
resolution and 5.625 seconds of time step. Probably we should make
some tunning of this parameters...<br>
</p>
<p>Many thanks.</p>
<p>Pau<br>
</p>
<br>
<div class="m_-6799693077398366421m_4924499790318523189moz-cite-prefix">El 20/04/18 a les 10:37, Marco Biordi
ha escrit:<br>
</div><div><div class="m_-6799693077398366421h5">
<blockquote type="cite">
<div dir="ltr">
<div>
<div>Hello Pau,<br>
<br>
</div>
you can get t=0 missing parameters when you enable the Digital
Filter Initialization.<br>
<br>
Do that by setting configuration option "filter_method" to
value 1 or 2 or 3 (usual one).<br>
<br>
</div>
<div>Regards<br>
</div>
<div><br>
Marco Biordi<br>
<br>
</div>
<div>San Marino Republic Weather Forecast Center<br>
</div>
<div><a href="http://meteo.sm" target="_blank">meteo.sm</a><br>
</div>
<br>
</div>
<div class="gmail_extra"><br>
<div class="gmail_quote">2018-04-20 8:26 GMT+00:00 Pau <span dir="ltr"><<a href="mailto:pescribaa@aemet.es" target="_blank">pescribaa@aemet.es</a>></span>:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hello all,<br>
<br>
I am a new user of NMMB model. I work at the Spanish Met
Agency with <br>
several NWP-LAM models. We are running daily NMMB at home
and we see <br>
that, after UPP processing, we don't get some surface
parameters like <br>
t2m, rh2m, u10m, v10m or visibility, at t=0, but we do for
any lead time <br>
t>0. After dedicating some time to look to UPP and NMMB
user's guides <br>
and namelists, I am quite sure this variables cannot be got
in an easy <br>
manner for t=0. Could anybody confirm me this? In such a
case, we have <br>
to do some further final work with vertical interpolations
and so.<br>
<br>
Thanks in advance!<br>
<br>
Pau Escriba<br>
<br>
Spanish Met Agency (AEMET)<br>
<br>
______________________________<wbr>_________________<br>
Ncep.list.emc.nmmb-questions-a<wbr>nd-answers mailing list<br>
<a href="mailto:Ncep.list.emc.nmmb-questions-and-answers@lstsrv.ncep.noaa.gov" target="_blank">Ncep.list.emc.nmmb-questions-a<wbr>nd-answers@lstsrv.ncep.noaa.go<wbr>v</a><br>
<a href="https://www.lstsrv.ncep.noaa.gov/mailman/listinfo/ncep.list.emc.nmmb-questions-and-answers" rel="noreferrer" target="_blank">https://www.lstsrv.ncep.noaa.g<wbr>ov/mailman/listinfo/ncep.list.<wbr>emc.nmmb-questions-and-answers</a><br>
</blockquote>
</div>
<br>
</div>
</blockquote>
<br>
</div></div></div>
</blockquote></div><br></div>
</div></div><br>______________________________<wbr>_________________<br>
Ncep.list.emc.nmmb-questions-<wbr>and-answers mailing list<br>
<a href="mailto:Ncep.list.emc.nmmb-questions-and-answers@lstsrv.ncep.noaa.gov">Ncep.list.emc.nmmb-questions-<wbr>and-answers@lstsrv.ncep.noaa.<wbr>gov</a><br>
<a href="https://www.lstsrv.ncep.noaa.gov/mailman/listinfo/ncep.list.emc.nmmb-questions-and-answers" rel="noreferrer" target="_blank">https://www.lstsrv.ncep.noaa.<wbr>gov/mailman/listinfo/ncep.<wbr>list.emc.nmmb-questions-and-<wbr>answers</a><br>
<br></blockquote></div><br></div>