Thompson, of Coral Springs, Fla., built a four-stroke lead over Kimberly Kim of Pahoa, Hawaii. The 14-year-old Thompson has led the girls division after all three days of play. She won the tournament in 2007.
Rain started falling as Thompson finished the last four holes. Play was suspended after the girls finished, then resumed a couple of hours later. Play in the boys division was suspended because of darkness.
The last few holes was a downpour, but I came out of them fine, Thompson said.
T.J. Vogel of Cooper City, Fla., made it through 12 holes in the third round before play was called. Vogel led after the second day and held a three-stroke lead when play was called in the third round, which will resume on Friday morning.