E-F-4 LEVEL TORNADOES LIKE THE ONE THAT RIPPED THROUGH NORTHERN ILLINOIS LAST WEEK ARE PRETTY RARE HERE.

ONLY 33 TORNADOES OF THAT MAGNITUDE HAVE STRUCK ILLINOIS SINCE 1950 SAYS STATE CLIMATOLOGIST JIM ANGEL.

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ANGEL SAY THE RATING IS DETERMINED BY BOTH THE DAMAGE THE TORNADO CAUSED AND WIND SPEED.

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ANGEL SAYS OF THE 33 E-F-4 TORNADOES RECORDED IN ILLINOIS OVER THE YEARS…JUST EIGHT, MOSTLY DURING THE 1960’S, HAVE STRUCK DURING THE MONTH OF APRIL.