Background
Prior to departure, the pilot was advised by a Flight Service Station that Amarillo reported snow flurries, visibility of 4 miles, and wind from 350 degrees at 28 knots gusting to 34 knots. Additionally, Tucumcari, New Mexico was reporting 2 miles visibility with light snow, while areas further west were clearing.
Flight
The pilot departed Amarillo under a special VFR clearance. The pilot stated that the weather was acceptable until west of Amarillo, where visibility deteriorated to 1/2 mile with blowing snow. Due to the decreasing visibility and increasing winds, the pilot decided to land in an open field.
Incident
While maneuvering the helicopter into the wind for landing, the engine intake screens iced up, and a loss of RPM was experienced. The helicopter contacted the ground and rolled over to the right.
Probable Cause
The source does not explicitly state a probable cause.