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  • SKYWARN Storm Spotter Guides Online
    A supercell thunderstorm characterized by a relative lack of visible precipitation Visually similar to a classic supercell, except without the heavy precipitation core
  • Spotters Field Guide - The Supercell You
    You can see the forward flank down draft on the right, the rain free base on the left, the location of the rear flank downdraft and any flanking line cumulus Also, there is usually good contrast between any developing tornado and the background lighter sky
  • SEVERE STORM STRUCTURE: RAIN-FREE BASE
    Being in the rain free base region offers an awe-striking view of the storm The diagram below shows the rain-free base at "G"
  • Spotting supercells: How to identify a severe thunderstorm – visual signs
    The wall cloud (murus or pedestal cloud) is a pronounced lowering in a supercell’s rain-free base It forms as rain-cooled air from both the RFD and FFD is pulled upward (entrained) with the warmer inflow air into the updraft
  • Types of Thunderstorms - National Oceanic and Atmospheric Administration
    The classic supercell will have a large, flat updraft base with striations or banding seen around the periphery of the updraft Heavy precipitation falls adjacent to the updraft with large hail likely
  • Schematic Diagrams: horizontal cross-section and westward view
    A westward view of the classic supercell reveals the wall cloud beneath the intense updraft core and an inflow tail cloud on the rainy downdraft side of the wall cloud Wall clouds tend to develop beneath the north side of the supercell rain-free base, although other configurations occur
  • Features Indicating Strong Severe Storms - National Weather Service
    Clearing skies working into the rain-free base, which suggests a part of the rear-flank downdraft is wrapping around the mesocyclone This often precedes or accompanies tornado formation in supercell thunderstorms
  • SEVERE THUNDERSTORM STRUCTURE
    The most violent rain and hail in a supercell tend to be on the outer edge of the updraft on the downdraft side of the storm Extreme turbulence on the edge of the updraft can contribute to significant hail growth
  • Storm Structure - Rain Free Base | Stormtrack
    Although the underside of the shelf (commonly referred to as the whale's mouth) may be void of rain the typical the term rain free base refers to the base of the updraft on a supercell
  • SKYWARN Storm Spotter Guides Online
    Perhaps the easiest low level feature to identify is the rain-free base As its name suggests, this is an area of smooth, flat cloud base beneath the main storm tower from which little or no precipitation is falling





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