Tuesday, May 18, 2021
It's shaping up to be the slowest severe weather season in Iowa history
(Radio Iowa) - Iowa is on track to have its quietest severe weather season in history. Senior meteorologist Brad Small, at the National Weather Service in Johnston, says their office covers 51 counties across western and central Iowa and practically the only time the warning sirens have wailed this year has been during the monthly tests.
"This is, by far, the slowest severe weather season in terms of the number of severe thunderstorm warnings and tornado warnings issued to date, through the 17th of May," Small says. "We've only issued three so far. You look at some of the other candidates, they're down -- like '87 was 13 (warnings issued), '93 was 14, so we're by far the lowest."
All three warnings issued were for severe thunderstorms. By comparison, the busiest year for severe weather was 2001, a year in which there had already been more than 200 warnings by this date. Small says the last time a tornado warning was issued by his office was in July of last year. Eastern Iowa has seen two relatively small tornadoes this year so far, but ordinarily there would've already been at least a dozen statewide. Iowa saw a total of 28 tornadoes touch down last year, which is well below the average number of around 50. As for this year, Small says conditions simply haven't been conducive for strong storms.
"For severe weather, we need instability, which is the warmth and the moistness in the air mass that we have in place, and we also need wind sheer, shallow and deep for tornadoes, and we really haven't had either of those to a great degree," Small says. "The season hasn't been particularly warm yet."
Small assures he's not tempting fate by calling attention to this being such a quiet season, as virtually nobody is itching for a tornado to spin out of black clouds on the horizon.
"No, we don't mind it slow at all for severe weather season," Small says. "It's not good for anybody. There's some people that get hyped up about severe weather, but the thing about severe weather and tornadoes is -- it affects somebody, someplace. The slower the season, the better, for most people involved."
The forecast does call for the possibility of warmer weather and thunderstorms later this week, but Small says overall, the chances for severe weather threats remain low.
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