The Long-baseline Optical Anemometer (LOATM) measures path averaged crosswind and turbulence over distances of 100 meters to over 10 km. Based on optical scintillation technology, its optics ‘see’ the always present temperature and density variation in small parcels of air as they move through the infrared beam. For applications where wind field direction is also needed, two systems can be setup in an “X” pattern. By surrounding an area with three or more end-to-end links, even the vertical component can be measured. The LOA provides true remote sensing of cross winds and turbulence in all weather conditions.