Tommy Bowe loses the ball in tricky weather conditions at the Liberty Stadium.
Jonathan Humphreys insists the Ospreys are hitting form at just the right time after regaining top spot in the Magners League.
Scotland wing Nikki Walker bagged a brace of first-half tries before skipper Ryan Jones sealed an emphatic Welsh derby victory over Cardiff Blues at the Liberty Stadium.
The result puts the Ospreys two points clear of Glasgow Warriors at the summit of the table and in good spirits ahead of a crunch month which includes mammoth Heineken Cup ties against Clermont Auvergne and Leicester Tigers.
Humphreys said: "It's good to be top of the league and that's where we want to be. We appreciate everyone else has games coming up but with the changes we made to our game, we always felt December and January would be defining months for us.
"The structure was good as was our defence. There are still things to work on but we believe things are coming right for us and our form is getting towards where we want it to be.
"We have to be in good shape going into the Heineken Cup and continue our momentum before facing Clermont."
Man-of-the-match Dan Biggar opened the scoring with a deft 12th minute drop goal on the way to an 11-point personal haul before Walker crossed at the end of the opening quarter.
Then Walker doubled his try count from close-range in the left corner following a neat break by fly-half Biggar and Jones added a third with a try just after the hour mark to leave the Blues white-washed.
Humphreys added: "We're pleased with the performance but it is disappointing that we didn't get the bonus point considering how early we scored the third try.
"We're delighted to keep them to nil and it's nice to achieve that against anybody. But it wasn't easy. There are a lot of battered and bruised bodies in the dressing room."
Blues coach Dai Young offered no excuses as his side are still searching for their away success in the league this season.
Young said: "Sometimes you have to hold your hands and say we were beaten by a far better side. It was a disappointing performance and the Ospreys controlled the field."
When the Wales squad were asked to nominate individuals who played a big part in their early playing days, Wales and Dragons full back and wing Hallam Amos thought of his former Monmouth School rugby coach John Bevan.
Sam Cross and Luke Treharne have been named as co-captains of the Wales Sevens side as head coach Gareth Williams names his 12-man squad to play in the first leg of the HSBC World Series in Dubai next weekend.
Bedwas head coach Steve Law and players Nicky Griffiths and Alun Rees extol the virtues of the close knit club as they prepare to host third place RGC 1404 - who are one place head of them on the Principality Premiership points table - on Saturday.
Many of the Wales squad have said Diolch (thank you) to someone who played an important part in their early playing days by nominating them to be invited to the Wales v South Africa match. One person, Gowerton Comprehensive geography teacher Mr Dean Mason was nominated by two of his former pupils, Dan Biggar and Sam Davies.
The second WRU disability rugby pilot has been delivered, this time in Caerphilly schools, culminating in a festival at the Caerphilly Centre of Sporting Excellence, Ystrad Mynach tomorrow. Plans are in place to set up a Disability Rugby Club in Newbridge to provide long-term playing opportunities.
WRU TV: Hear from inside the Wales camp as Neil Jenkins discusses this weekend's clash with South Africa and how the squad are looking to put in a strong performance to round of the 2016 Under Armour Series