I went to the NOAA's San Francisco and Richmond stations to see just what effect that tsunami had on the water levels. The tsunami hit the Golden Gate Bridge with 2 foot waves about 8 a.m. on the 11th. "Water is coming in, going out, coming back in again, " [National Weather Service forecaster Diana] Henderson said. Source
And that is exactly the way San Francisco's station data looks -- water coming in, going out, coming back in again. As you can see from the plot, the water level had been a little below predicted. About 8 a.m. on the 11th, the water level became very erratic, in the initial hours going up and down by as much as 3 feet.
The Richmond station didn't show such dramatic water level ups and downs, as it is 9 miles further north, but still a very noticeable effect.
I hope this finally convinces the skeptics that the water level data from the NOAA does accurately reflect what's going on in real-time in the Bay.
Luckily for the Bay, the tsunami's arrival had the best timing -- during a LL tide and a period of lower than average H and HH tides.