EF4 and EF5:
2018 was the first year
since record-keeping
began in 1950 without
the US being hit by
an EF4 or EF5 tornado,
the most devastating twisters,
as rated on the
Enhanced Fujita Scale
from EF0 to EF5,
according to the
NOAA / NWS Storm
Prediction Center.
EF3, EF4 and EF5:
F3 through F5 tornadoes
averaged 56 per year,
from 1950 to 1985.
But from 1986 to 2018
only 34 per year
touched down
in the USA
on average –
and for
the first time ever
not one did in 2018.