Notes

Cloud Classification and Characteristics

1. http://www.crh.noaa.gov/lmk/?n=cloud_classification
2. http://www.weatherscapes.com/gallery.php?cat=clouds&subcat=thunderstorms&expand=thunderstorms
3. https://www.google.com/search?q=types+of+storm+clouds+with+pictures&rlz=1C1ASUT_enUS504US504&oq=Types+of+storm+clouds&aqs=chrome.1.57j0l3.32523j0&sourceid=chrome&ie=UTF-8&sei=EWdcUYPVL47yigKlkoCIAg&gbv=2
4. 
   

Rear flank downdraft. As rain/hail falls it moves air with it this outflow of air is the rfd and these winds can be wicked strong.
Rear Flank Downdraft
A region of dry air subsiding on the back side of, and wrapping around, a mesocyclone. It often is visible as a clear slot wrapping around the wall cloud. Scattered large precipitation particles (rain and hail) at the interface between the clear slot and wall cloud may show up on radar as a hook or pendant; thus the presence of a hook or pendant may indicate the presence of an RFD.