The Houston/Galveston National Weather Service will be having a Skywarn training class Thursday April 6th. Two classes will be offered, one at 1pm and another at 6pm. It will be held downtown Bryan at the CEOC. Here is the NWS schedule link. http://www.weather.gov/hgx/skywarn_schedule.
Here is the link for the CEOC about Skywarn. However looks like it has not been updated since last year, so ignore the dates. http://brazosceoc.org/index.php/2016/02/26/skywarn/
In the past it was recommended to preregister. Recommend to contact the person listed at the CEOC in either link.