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Understanding S.L.I.M.

You hear it all the time on The Weather Channel, but what does the acronym "S.L.I.M." really mean? It's an abbreviation for Shear, Lift, Instability, and Moisture, otherwise known as the 4 components needed for severe weather to occur. Meteorologist Jen Carfagno breaks the explanation down in an easy-to-understand way using our enhanced graphics.