(Des Moines) Storm Predictors are hoping to clarify the slight risk of storms that can turn out nasty.
Meteorologist Jeff Johnson says for example, the Parkersburg EF5 tornado in 2008 was forecasted as a slight risk. But, it was a high end of a slight risk, more of an isolated high impact area. On the flip side of the coin, Johnson says a slight risk could mean elevated hail storms over a broader area, which is severe weather, but not the impact of tornadoes.
“I think what they’re trying to do is provide some more insight into that pretty broad area of slight, we call it,” said Johnson. “To reach moderate you’ve got to have magnitude and a large amount of severe weather in addition to the magnitude.”
Johnson says the storm prediction center in Oklahoma will make the changes in the next few months. The current system will move from a 3-category chart to a 5-tier system.
Iowa Radio Network