South Texas hopes economic upturn means return of snowbirds By Lynn Brezosky ASSOCIATED PRESS Friday, November 14, 2003 HARLINGEN -- Dean and Diane Yahnke are among the first couples to stock their mobile home and dust off their golf clubs for the coming winter at Tropic Winds resort. After two lackluster tourism years, the Rio Grande Valley is more than ready to accommodate the St. Cloud, Minn., pair. At least 20,000 Midwesterners usually venture south to Texas for the winter, but sagging stock market returns and post-Sept. 11 fears kept many people at home over the past two years. The...