Webb, a three-time winner this season, closed with a bogey at the 18th but still holds the second-round lead for the third time this season. She and Jang stand at 7-under-par 137.
Jang had a 1-over 73 in the second round -- nine shots worse than her course-record 64 on Thursday, which gave her the first-round lead by three shots. She had two bogeys and just one birdie Friday.
Stacy Prammanasudh and Maria Hjorth both shot 4-under 68 and are tied for third place with Lorie Kane (71) at 6-under 138.
Webb held the lead alone at 8 under until she missed a 20-foot par putt from the back fringe at the 18th and closed with a bogey. It was her second bogey of the round and third of the tournament so far.
But Webb still likes her position -- especially, she said, considering the windy conditions players had to deal with Friday.
'I was really solid today,' she said. 'I didn't get of to the greatest start, but as soon as the wind picked up my concentration really snapped in, which was good to see because the conditions out there were really tough.'
Wind gusts were higher Friday than weather forecasts predicted they would be at Blackhawk Country Club, a new host course for this event.
Webb made a bogey early at the par-4 second, but got back to her overnight score of 5 under with a 3-foot birdie putt at the par-4 eighth. She then birdied back-to-back holes from the 10th, getting to seven-under with a 5-foot putt at the 11th.
A 15-foot birdie putt at the 17th gave Webb the lead alone, but she coughed it up on the next hole.
At the 406-yard, par-4 18th, Webb hit a 5-iron short off the green, chipped to the back fringe and two-putted from 20 feet for her closing bogey.
'Obviously the bogey leaves a little bit of a bad taste in my mouth,' admitted Webb, 'but if you had told me I was going to shoot two-under today with the wind I would have taken it.'
In a season-long battle with Lorena Ochoa for the LPGA Tour money lead (Ochoa currently leads), Webb hasn't played since tying for sixth place at the Wendy's Championship for Children almost four weeks ago.
'I didn't really know what to expect this week, so I feel really good where I put myself these two days,' she said.
Jang opened her second round with a bogey from the sand at the par-3 10th. She made her only birdie at the 13th, then gave up another shot at the par-5 15th when she three-putted from 90 feet.
After that, Jang made 12 straight pars to finish off her 73. She went 5 under on those same holes Thursday.
'I had a really tough day,' said the two-time LPGA winner. 'I had a bad start and a bad finish. That was it.'
Cristie Kerr, the 2002 champion, had a 70 on Friday and is tied for sixth place with Jill McGill (71) and Morgan Pressel (68) at 5-under 139.
One shot further back, Annika Sorenstam leads a group of five players who are knotted in ninth place at 140. Sorenstam, the 1997 champion, shot her second consecutive 70 on Friday. She admitted being stressed out about the windy conditions.
'It was just swirling so much,' she said. 'It's not just two, three miles per hour. We're talking 15 to 20, maybe even more...I've been thinking so much out there, I'm worn out.'
The cut line fell at 4-over 148 with 72 players moving on to the weekend.
Among the other players who made the cut were Sorenstam's sister Charlotta (plus-one) and Pat Hurst, who had a hole-in-one Friday with a 7-iron from 170 yards at the 10th.
'Hopefully this is the start of something for me,' said Hurst, who shot her second consecutive 73 to sit at plus-2.