The NEXRAD site, in order to deliver composite reflectivity, must complete a
full scan. That is, one rotation at each elevation of the transmitted beam.
That's what takes the time. Why the WARP system is further delayed is pretty
much a function of collecting scans from all of the relevant NEXRAD sites
and combining them into a mosaic, and I have no idea how much time that
takes.

Bob

"Jon Woellhaf" wrote in message
news
Several posters have stated that NEXRAD images displayed on the Garmin 396
are five or more minutes old because that's how long it takes for the
images to be processed before they're sent to the XM satellite.

What kind of processing could possibly take five minutes? I suspect
whomever's in control of the processing is introducing the delay so they
can sell seconds old data as a premium service.

Jon