Severe Storms – July 28, 2009

Numerous severe storms moved southward through northern and central Oklahoma during the late afternoon and evening.  Typical for July, wind damage was the primary threat with these storms.  However, some large hail also occurred.  One storm that passed just northeast of Blanchard likely produced hail to near tennis ball size and displayed a classic large hail signiture on radar as it did.

Known as a three body scatter spike (TBSS), the long stretch of weak echo extending off the backside of the storm in this radar image can often indicate hail to golfball size or larger.

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Also known as hail spikes, these are the result of energy from the radar hitting hail and being deflected to the ground, where they deflect back to the hail and then to the radar. Because of the energy hitting the ground at least once and the hail multiple times, it has a weaker return echo than the energy that went from the radar to the hail and back to the radar. The spike occurs where the energy took more time to go from the hail to the ground and back as opposed to the energy that went direct from the hail to the radar. This results in the radar picking up the energy at a later time which puts the echo further away from the radar than the actual location of the hail on the same radial path.

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