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[Datastream #THN-824571]: Problem with FNEXRAD radar mosaics

Greetings,

Thanks for the report, we'll look into it.

It appears we have the Radar Duration (RADDUR) set for 30 minutes, which is the 
setting that defines the time window radar data may be selected from.  Even 
though that number happens to be the default value we have it set explicitly, 
so as long as good data has been seen from a site within the last half hour 
that data should be getting included in the mosaics.

Through my powers of telepathy I know you're using the N0B mosaic for that 
product you linked.  I see sites that definitely have scans within the past 
half hour not being included in your mosaics, so that much is raising my 
eyebrow.  This unfortunately means a fix will not be as simple as adjusting the 
RADDUR value.  I'll see if I can narrow down what's happening and if this is 
something within our control we'll do our best to address it.  But given that 
GEMPAK is the software used to make the mosaic data on the FNEXRAD feed (the 
nex2gini program specifically), there is a possibility of a GEMPAK issue that 
may be difficult to resolve.  It's too soon to know for sure, but this is the 
road I'll be going down.

Best,
-Mike


> Hello,
> 
> There is a problem with the UNIDATA-created base reflectivity national mosaic 
> product on the FNEXRAD feed. Radar sites randomly appear and disappear, 
> causing a "strobing" effect when animated/looped. Time-sensitive: look in the 
> northeastern U.S. here to see the issue:
> 
> https://weather.cod.edu/satrad/?parms=continental-conus-comp_radar-24-0-100-1&checked=map&colorbar=undefined
> 
> It *appears* as though valid radar data older than 5 minutes is being 
> discarded. Can that valid radar data threshold be increased to 12 minutes?
> 
> Thank you!

Ticket Details
===================
Ticket ID: THN-824571
Department: Support Datastream
Priority: Normal
Status: Open
===================
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