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We have monitored twelve T dwarfs with the Kitt Peak 2.1m telescope using anf814w filter (0.7-0.95 microns) to place in context the remarkable 10-20%variability exhibited by the nearby T dwarf Luhman 16B in this wavelengthregime. The motivation was the poorly known red optical behavior of T dwarfs,which have been monitored almost exclusively at infrared wavelengths, wherevariability amplitudes greater than 10% have been found to be very rare. Wedetect highly significant variability in two T dwarfs. The T2.5 dwarf 2MASS13243559+6358284 shows consistent ~17% variability on two consecutive nights.The T2 dwarf 2MASS J16291840+0335371 exhibits ~10% variability that may evolvefrom night to night, similarly to Luhman 16B. Both objects were previouslyknown to be variable in the infrared, but with considerably lower amplitudes.We also find evidence for variability in the T6 dwarf J162414.37+002915.6, butsince it has lower significance, we conservatively refrain from claiming thisobject as a variable. We explore and rule out various telluric effects,demonstrating that the variations we detect are astrophysically real. Wesuggest that high-amplitude photometric variability for T dwarfs is likely morecommon in the red optical than at longer wavelengths. The two new members ofthe growing class of high-amplitude variable T dwarfs offer excellent prospectsfor further study of cloud structures and their evolution.

Weather on Other Worlds. III. A Survey for T Dwarfs with High Amplitude Optical Variability