In article ,
"Montblack" wrote:

Is there a link to any PIREPS that reported them building?

I posted the image at the usual alt.binaries.pictures.aviation site. I
copied it off of the aviationweather.gov link to the national radar/cloud
tops link.

http://aviationweather.gov/data/prod..._12_CL_new.gif
Was this the page?

http://aviationweather.gov/obs/radar/
Or this?

http://aviationweather.gov/obs/radar/