Background
The pilot was en route from Deming, New Mexico, to Waco, Texas. Prior to departure from Deming, he had received a complete weather briefing. During the briefing, the briefer informed him that the weather along his proposed route of flight would be deteriorating.
Flight and Weather
While en route, the pilot encountered deteriorating weather. He elected to divert to Brownwood, Texas, which was his alternate airport. The pilot was unable to locate the alternate airport due to reduced visibility and the light conditions.
Landing Sequence
Unable to find the airport, the pilot decided to land in a cow pasture. During the landing roll, the airplane struck a barbed wire fence. The airplane then nosed over into a creek.