skywarn eyeSKYWARN Weather Spotter's Field Guide  and a list of SKYWARN classes held by the National Weather Service offices in South Texas:

Austin/San Antonio https://www.weather.gov/ewx/skywarn

Corpus Christi https://www.weather.gov/crp/skywarn

Houston/Galveston https://www.weather.gov/hgx/skywarn_schedule