Updraft Base - Alternate term for a rain-free base.
Upper Level System - A general term for any large-scale or mesoscale disturbance capable of producing upward motion (lift) in the middle or upper parts of the atmosphere.
Updraft Base Alternate term for a rain-free base.
Upper-Level Disturbance A disturbance in the upper atmospheric flow pattern which is usually associated with clouds and precipitation.
Compare with beaver tail, which is a form of inflow band that normally attaches to the storm's main updraft (not to the wall cloud) and has a base at about the same level as the updraft base (not the wall cloud).
For this reason, updraft base is more accurate.RainbowA luminous arc featuring all colors of the visible light spectrum (red, orange, yellow, green, blue, indigo, and violet).
The heaviest precipitation is usually on the southwest side, ending abruptly short of the rain-free updraft base or main updraft (not visible to radar).
LP supercell thunderstorms often have a small updraft base as seen in this thunderstorm near Hart, Texas.
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Although no wall cloud was present, baseball hail was occurring in the precipitation shaft on the right, with a rotating updraft base in the center of the photograph. A very rapid right to left movement was visible with the rain foot.
Note that the rain-free base may not actually be rain free; hail or large rain drops may be falling. For this reason, updraft base is more accurate. See Figs. 3 (HP storm), 5 (LP storm), and 7 (supercell).
UDI - Updraft Downdraft Interface. A region of a thunderstorm where the rain-free updraft base meets the downdraft region (and precipitation). Strong winds and / or large hail can sometimes be found near the UDI.
base itself - especially when the rain-free base is on the south or southwest side of the main precipitation area. Note that the rain-free base may not actually be rain free; hail or large rain drops may be falling. For this reason, updraft base is ...
 See also: Updraft, Precipitation, Storm, Cloud, Air
  
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