I have been trying to find the rating as well, but the only thing I keep finding is found at
http://www.bom.gov.au/climate/current/month/sa/adelaide.shtmlunder the heading Severe thunderstorm BOM is quoted as
Severe Thunderstorm
A small supercell spawned a significant tornado in the southern Adelaide suburb of Port Noarlunga on 11 July. The tornado damage track was 2.7 km long. At the western end, the tornado damaged five houses, demolished a shed, shifted cars, and hurled iron and glass debris across an oval during a football match. One person on the oval was injured. Substantial tree damage occurred along the eastern section of the track. Damage was rated to be at the high end of category F1 or possibly the low end of category F2 on the Fujita tornado category scale This is the same as Teckert has posted.
From reading a lot of the archived news reports found on the net from "The Age", ABC news etc etc, some state that the winds were 150km/h while others are stating the winds were 160km/h.
No real clarification yet from officials unless the abovementioned statement is the official report.
Col