Severe Thunderstorm Watch 651 has now been extended to include the following counties, Audubon, Black Hawk, Boone, Dallas, Greene, Grundy, Guthrie, Jasper, Marshall, Polk, Poweshiek, Story and Tama. Storms continue in NW Iowa and are moving quickly to the southeast across the state. Very high winds will likely be the main threat for the rest of the overnight hours.