LA CROSSE, WI (504 PM CDT Thu Sep 12 2019) — The National Weather Service in La Crosse has issued a Severe Thunderstorm Warning for Southwestern Allamakee County in northeastern Iowa Southeastern Winneshiek County in northeastern Iowa until 545 PM CDT. At 503 PM CDT, a severe thunderstorm was located near Ossian, or 13 miles northeast of West Union, moving northeast at 20 mph. HAZARD: 70 mph wind gusts and nickel size hail. SOURCE: Radar indicated. Expect considerable tree damage. Damage is likely to mobile homes, roofs, and outbuildings. This severe thunderstorm will be near Postville around 515 PM CDT. Waukon around 545 PM CDT. Other locations impacted by this severe thunderstorm include County Roads X 16 And B 38, State Road 76 And County X 16, Frankville, State Road 51 And County W 48, Ludlow, Hardin and Castalia. This storm is also producing frequent dangerous lightning. A Tornado Watch remains in effect until 1000 PM CDT for northeastern Iowa. For your protection move to an interior room on the lowest floor of a building. Intense thunderstorm lines can produce brief tornadoes and widespread significant wind damage. It is best to move to an interior room on the lowest floor of a building. This storm may cause serious injury and significant property damage.