Re: [gembud] N0R and N0Q Beam Anomalies

[Gerald Creager <gerry.creager@xxxxxxxx>]

I see those periodically, and have for years, in my composites. I've not 
had sufficient complaints to warrant any investigation, though. They 
look like a range anomaly in the scan sequencing, though, at first glance.

gerry

Michael James wrote:
> GEMPAK Users,
>
> I'm wondering if anyone has information about these radar beam artifacts?
>
> http://www.unidata.ucar.edu/staff/mjames/gempak/n0q.gif
>
> They're present in both N0R and N0Q products, but seem to be occuring 
> more recently.  It's less of a nuisance for N0R due to low dBZ 
> thresholding and limited range, but their presence in the N0Q national 
> composite is unwelcome.  These anomalous returns are constant in time 
> and the reflectivity values seem to increase linearly with range/height 
> (you can check n0r and n0q for JAX and GRR in NMAP2 to see for 
> yourself).  They appear less frequently in higher tilts, so perhaps 
> they're a result of beam ducting?
>
> Other thoughts?
>
> Michael James
> Unidata
>
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--
Gerry Creager -- gerry.creager@xxxxxxxx
Texas Mesonet -- AATLT, Texas A&M University
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