Final answer:
If the height contours are parallel to the isotherms, no thermal advection would take place.
Step-by-step explanation:
If the height contours are parallel to the isotherms, a forecaster would expect no thermal advection to take place. This is because parallel height contours indicate a uniform change in elevation. Similarly, parallel isotherms indicate a uniform change in temperature. Since there is no variation in temperature across the area represented by the map, there would be no movement of warmer or cooler air masses, resulting in no thermal advection.