Slide 27 of 28
Notes:
In this picture we are looking at what is called an outflow or gust front. This occurs when the rain cooled air from the downdraft of the storm moves out from the storm. The dBZ return will usually be in the 5 dBZ to 10 dBZ range but can be as high as 20 dBZ when there is a lot of moisture present in the atmosphere. The radar is helpful in that the meteorologist can look for areas where two gust fronts will collide and possibly form new thundertorms. This is an important tool during flash flood situations.
