Source : Webster's Revised Unabridged Dictionary (1913)

Thundery \Thun"der*y\, a.
   Accompanied with thunder; thunderous. [R.] ``Thundery
   weather.'' --Pennant.

Source : WordNet®

thundery
     adj 1: loud enough to cause (temporary) hearing loss [syn: {deafening},
             {earsplitting}, {roaring}, {thunderous}]
     2: accompanied with thunder