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20060214: AP removal with Level-II data in GEMPAK

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  • Subject: 20060214: AP removal with Level-II data in GEMPAK
  • Date: Tue, 14 Feb 2006 13:45:00 -0700
Robert,

AP and clutter as well as second trip echoes etc requires volumetric
as well as velocity and phase informationi (combining satellite imagery can 
help too!).
You might find the information in Steven Vasiloff's March 2005 presentation here
enlightening (as well as Ken Howard's May 2005 presentation).

http://www.unidata.ucar.edu/community/seminars/

See the section on vertical continuity for Reflectivity QC!

Several groups are working on a real-time national 3-D mosaic which
we are pursuing for the community on this end, but no time frame at the moment.

Steve Chiswell
Unidata User Support


>From: "Robert Mullenax" <address@hidden>
>Organization: UCAR/Unidata
>Keywords: 200602142022.k1EKMOO7013926

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>Steve,  I don't if we will ever have enough bandwidth to get Level-II =
>data at CSBF, but I was intrigued by the answer you provided below while =
>I was perusing the archive.  Can you elaborate on how you would use =
>Level II to do AP removal? =20
>
>Thanks,
>Robert Mullenax
>Senior Meteorologist/Weather Systems Administrator
>NMSU/CSBF
>
>
>"Patrick,
>
>The simplest masking I do with the gridded data is:
>GDPFUN   =3D mask(n0r,sge(net,5))
>
>That only plots the reflectivity where the echo tops are
>greater than 5km.=20
>
>Our snow in particular can have low tops, so in the precipitation
>type plot, I only mask the reflectivity with the echo tops
>where the type is rain.
>
>To do true AP or ground clutter supression requires the level 2 radar
> volume rather than the level III products.
>
>Steve Chiswell
>Unidata User Support
>"
>
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><TITLE>AP removal with Level-II data in GEMPAK</TITLE>
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><P><FONT SIZE=3D2>Steve,&nbsp; I don't if we will ever have enough =
>bandwidth to get Level-II data at CSBF, but I was intrigued by the =
>answer you provided below while I was perusing the archive.&nbsp; Can =
>you elaborate on how you would use Level II to do AP removal?&nbsp;<BR>
><BR>
>Thanks,<BR>
>Robert Mullenax<BR>
>Senior Meteorologist/Weather Systems Administrator<BR>
>NMSU/CSBF<BR>
><BR>
><BR>
>&quot;Patrick,<BR>
><BR>
>The simplest masking I do with the gridded data is:<BR>
>GDPFUN&nbsp;&nbsp; =3D mask(n0r,sge(net,5))<BR>
><BR>
>That only plots the reflectivity where the echo tops are<BR>
>greater than 5km.<BR>
><BR>
>Our snow in particular can have low tops, so in the precipitation<BR>
>type plot, I only mask the reflectivity with the echo tops<BR>
>where the type is rain.<BR>
><BR>
>To do true AP or ground clutter supression requires the level 2 =
>radar<BR>
>&nbsp;volume rather than the level III products.<BR>
><BR>
>Steve Chiswell<BR>
>Unidata User Support<BR>
>&quot;</FONT>
></P>
>
></BODY>
></HTML>
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