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— When forecasting for severe weather season, there are different ingredients that determine if thunderstorms will develop and if they could become severe, said Storm Center 7 Meteorologist Kirstie Zontini.
For typical thunderstorm development you need:
For storms to become severe, something called shear is needed. There are two types — speed and directional.
The combination of speed and directional shear or the presence of just one or the other can help determine the type of severe storms (organized lines, tornadoes, etc.)
If all four ingredients (S.L.I.M) are present, then there’s a threat for severe storms.