We were out fishing and after checking the morning weather report we were expecting the winds to increase in the evening but they increased around 11:30 am.  We were returning around noon when we got into shallow water.  We got out to get the boat back in deeper water. We circled northwest before going back southeast toward the Padre Island Bridge. We were running into the waves at 2/3 throttle. Approximately 1.5 miles from the bridge we hit larger waves(SE) that came over the front. I cut the power back to idle. Waves then came over the back and left side.  Within seconds we had swamped and capsized. I cut the engine off when we started to turn over. We were able to get on top of the up side down boat and stood in a line for approximately 18 hours.  We were left with no way to signal for help. We floated almost to the airport but were anchored several times during this time.

Operator Completed Report.
Port Isabel                   