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We report 323 hours of nearly uninterrupted time series photometricobservations of the DBV star GD 358 acquired with the Whole Earth Telescope(WET) during May 23rd to June 8th, 2000. We acquired more than 232 000independent measurements. We also report on 48 hours of time-series photometricobservations in Aug 1996. We detected the non-radial g-modes consistent withdegree l=1 and radial order 8 to 20 and their linear combinations up to 6thorder.We also detect, for the first time, a high amplitude l=2 mode, with aperiod of 796s. In the 2000 WET data, the largest amplitude modes are similarto those detected with the WET observations of 1990 and 1994, but the highestcombination order previously detected was 4th order. At one point during the1996 observations, most of the pulsation energy was transferred into the radialorder k=8 mode, which displayed a sinusoidal pulse shape in spite of the largeamplitude. The multiplet structure of the individual modes changes from year toyear, and during the 2000 observations only the k=9 mode displays clear normaltriplet structure. Even though the pulsation amplitudes change on timescales ofdays and years, the eigenfrequencies remain essentially the same, showing thestellar structure is not changing on any dynamical timescale.Comment: 34 pages, 14 figures, WET data, accepted to A&

The everchanging pulsating white dwarf GD358