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11 February 2013
Tornado Strikes Hattiesburg MS. Tornadic Storms Rumbling into South Alabama As well.
There is only weak instability but the wind shear is very conducive to tornados ahead of a cold front. Meteorologists look at a particular type of low-level wind shear called the storm relative helicity. Values above 200 are a warning sign and above 300 are a BIG warning to look for tornadoes. I am seeing values over 600 across South AL now so the threat remains.