Storm relative velocity

Notes:

0.5 degree storm relative velocity loops indicate two persistent, rotational couplets for several minutes prior to tornadogenesis. The strongest couplet, with rotational values around 34 kts, produced the tornado around 2042z. Storm relative velocity at other levels (not shown) indicate that this storm exhibited rotational values of 20-30 kts for several volume scans through a deep layer prior to tornadogenesis.

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Slide 16