HOW THE STORM SCORE WORKS — every SPC storm report between 2006 and 2025 whose location came within
10 miles of that restaurant, weighted: a tornado rated
EF2 or stronger counts 25, any other
tornado 10, a
significant hail (2″+) or wind (65 kt+) report
2, and every other
hail or wind report
1. Tornadoes are measured along the whole track, not just where they touched down.
WARN/YR is a different thing and a coarser one: the NWS severity index (10·tornado warnings + 3·severe +
2·tornado watches + 1·severe watches, per year) for the
county the restaurant sits in, the same
weighting the
Alerts Archive uses.
Storm reports depend on somebody being there to report them, so a busy metro will always out-report a
swamp — this is observed severe weather, which is not quite the same thing as severe weather.