Some areas of convection shown by the microwave imagery move over open water, away from clouds. How can this be?
The morphing algorithm moves microwave signatures of convective cells within a frame of reference that follows the path of the storm center. This is an effective advection scheme in some cases but not in others. The most common problem with this scheme is that some convective cells are fairly stationary (shown in the IR layer), but the algorithm advects the PCT signal away from the true position. (In practice, this appears as the PCT signal advecting through the IR cell, as it moves toward the IR cell before the time of the nearest PCT image and away from the IR cell after the time of the nearest PCT image.
