Both sides have won two from two so far but England's victories have come against the traditionally weaker opposition of Italy and Scotland.
But Jenkins insists that, regardless of the opposition faced, Wales will have their work cut out for them next weekend when battle recommences.
"One win since 1988 I think says it all, really. We are under no illusions about what is ahead of us a week on Saturday. It is going to be very tough and very physical," he said.
"They (England) won their first two games. It is never easy to go to Murrayfield and Rome and win, and they will be very happy with the results they've got.
"They will fancy their chances. We've done reasonably well against them at home over the past ten years, but it has been pretty tough and bleak for us at Twickenham.
"We know what is at stake. It is a Triple Crown game for us and a chance to win and go on to try to win the championship.
"We did the job in Dublin this year, but that has gone now. Next week will be a totally different occasion and totally different game, so we have got to make sure we are right.
"Winning in Dublin was a fantastic achievement for us, and we want to do our best to make that count at the end of the day and give ourselves a chance to win a pretty prestigious trophy.
"I think England will come and have go at us, without a doubt. They have got a very good back-three, and I am sure they would love to get the ball to them on more occasions and give them an opportunity."