page_title: Hail spike
section_title: Multiple TBSS Signatures
hierarchical_section_title: Hail spike / Multiple TBSS Signatures
caption_attribution_description: English: 3-D -9.0 dBZ isosurface image (from GR2AE) showing the three separate TBSS signatures (denoted by the blue arrows) seen in Oconto County at 2054 UTC 1 July 2006. Perspective is looking southward toward the radar and down at the storm.
context_page_description: A hail spike or three body scatter spike is an artifact on a weather radar display indicative of large hail. They are identified by a spike of weak reflectivity echoes that extend out from a thunderstorm, and away from the radar site.
context_section_description: In rare cases more than one hail spike has been documented with a single storm in one volume scan. This indicates that more than one hail core exists in the same storm and far enough apart that each core can be sampled by the radar individually.
caption: 3-D image showing three separate TBSS signatures in one volume scan
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