Any image not specifically noted as copyrighted is in the public domain, and can be used freely. Figure 1 . Figure 2 . A gust front photographed in South Florida during the Florida Area Cumulus Experiment. The characteristic profile produced by the sinking of rain-cooled air extends farther forward near the ground but is retarded at the surface by friction.
Gust fronts are much more widespread than microbursts, often extending over tens of kilometers.
Typical appearance of a microburst on Doppler radar as observed during the Joint Airport Weather Studies project. Figure 4 . The shaded portion is the friction boundary layer that contains vorticity opposite to that of the descending ring. Figure 5 . The upward curl of the microburst is visible on the right of the rain shaft and has ascended several kilometers toward the base of the cumulonimbus.