Anatomy of a Supercell:Tuscaloosa EF4

The supercell thunderstorm in the radar picture above contains a hook echo(white arrow). A hook echo is the radar signature of precipitation wrapping around a mesocyclone, the rotating column of air within the storm. The area with no precipitation is also known as the bounded weak echo region, or BWER (red arrow). The updraft is so strong in the area of rotation that the rain and hail cannot fall, and have been blown to the southwest (blue arrow), where the rear flank downdraft is (green arrow). Typically this precipitation is only present to the north, but not in this case. From the west, the area of the mesocyclone would be shrouded by rain and hail. The clear mesocyclone is where a tornado may, and in this case does, form. The entire storm moves northeast toward the upper right corner of the radar screen, the mesocyclone or tornado trailing with it. Storms with a hook echo are guaranteed to be tornado warned, it is not just a matter of spotting one forming or on the ground. This is the Tuscaloosa, Alabama storm that spawned a massive EF4, shown by the hook echo above.

Recent Rainbow After Thunderstorm

The first photo of the two is the original, taken after a short afternoon thunderstorm. The second is the photograph after I altered it to show the rays of the rainbow better. The circular bands are just result of the filter, they are not part of the phenomenon. 

SPC 2 Day Convective Outlook

http://www.spc.noaa.gov/products/outlook/

Photos and Radar of Henry County Supercell

This tornado warned supercell was small, but almost entirely hooked. It could almost be classified as a bow echo. Fortunately, it did not produce a tornado over a densely populated area. These photos were taken from the west of the storm, therefore, the area of indicated rotation is not visible.

Photo and Radar of April 27th Supercell

While there was no major damage from this storm, it was tornado warned, and there were sightings of funnel clouds in Browns Summit and in the area above Winston Salem. It traveled from Winston Salem, Northeast through Rockingham County before crossing into both Henry and Pittsylvania Counties. It remained tornado warned until it began to dissipate.