If the line on radar imagery appears perfectly straight, it could indicate several possible weather phenomena, depending on its characteristics and context:

Fronts: A straight line on radar imagery may represent the location of a weather front, such as a cold front, warm front, or stationary front. Fronts are boundaries between different air masses with contrasting temperature, humidity, and wind characteristics. They can produce bands of precipitation along their boundaries, resulting in a linear pattern on radar imagery.

Outflow boundaries: Outflow boundaries are often associated with straight-line segments on radar imagery. These boundaries form when cool, sinking air from thunderstorm downdrafts spreads out horizontally near the ground, creating a distinct boundary between the outflow air and surrounding air. Outflow boundaries can trigger the development of new storms or enhance existing ones along their leading edges.

Severe weather features: Straight-line segments on radar imagery can also indicate the presence of severe weather features such as squall lines, bow echoes, or derechos. These phenomena are characterized by long, straight-line segments of intense reflectivity associated with strong winds, heavy rain, and potentially severe weather hazards such as tornadoes.

Radar artifacts: In some cases, straight-line features on radar imagery may be caused by radar artifacts or processing errors rather than actual weather phenomena. These artifacts can include ground clutter, anomalous propagation, or interference from man-made objects, which may appear as straight lines on radar displays.