The Collaborative International Dictionary of English v.0.48:
Thundery \Thun"der*y\, a. Accompanied with thunder; thunderous. [R.] "Thundery weather." --Pennant. [1913 Webster]WordNet (r) 3.0 (2006):
thundery adj 1: loud enough to cause (temporary) hearing loss [syn: deafening, earsplitting, thunderous, thundery] 2: accompanied with thunder