At 1910Z on May 20, OCTANE picked up a good signal on convection developing just northwest of Chicago, IL. On the Speed Direction product, there was a well-defined difference in direction vector on the southeast flank of the anvil (250deg) versus the western flank of the anvil (200deg).

There is also a subtle signal on the OCTANE speed sandwich product, though not as pronounced. Regardless, for a fresh storm just reaching severe levels, it was worth noting.

–Insolation