Surface observations indicate that widespread fog, reducing visibilities to between 2 and 5 miles, is developing and persisting within Deep South Texas and the Rio Grande Valley at this time. Surface observations, and TXDOT cameras, also indicate that isolated patches of more dense fog, reducing the visibility to less than 1 mile, are also forming. The intensity of the fog will be monitored through the next few hours, and a Dense Fog Advisory may need to be issued for portions of the region if the dense fog becomes more widespread. In the meantime, motorists are urged to reduce speed, use low beam headlights, and avoid tailgating in any fog through the next few hours.