Update: 9:30 pm. Tornado watch extended into the far southern suburbs of the Twin Cities....Doppler shows strong storms over Dakota county, but the most extreme cells are still rumbling across far southern Minnesota. An isolated tornado may develop near Mankato, Waseca, Northfield, Gaylord and Faribault - the watch is in effect until 10 pm but may be extended longer. The storms do not seem to be weakening, they're sustaining their strength, and the tornado risk may linger beyond 10 pm, especially near the Iowa border. People living over southern MN should stay alert and be ready to seek shelter. An isolated tornado can't be ruled out just south/east of the Twin Cities, near Cottage Grove and Hastings, even though this part of the state isn't in the tornado watch.