http://tinyurl.com/2mz2y9

Upper right corner.

Note the age of the NEXRAD vs. the age of the XM lightning.

According to various people on the Cessna Pilots Ass'n forums, it's a bug that
crept in wiyh a redesign of the G1000's GDL69/69A XM receiver module. Garmin
is working on a fix.

--
Dan
T-182T at BFM