Overnight Thunderstorms

Additional thunderstorms are once again developing just ahead of the cold front, from northeast Nebraska through portions of extreme northwest Iowa. Previous thunderstorms that were severe warned in northwest Iowa (Lyon county) moved northeast into southern Minnesota where some severe warned storms continued to occur.

This line of thunderstorms in portions of Nebraska and Iowa are becoming more organized, as the individual cells move east-northeast and the line slowly progresses nearly southeast overnight. One cell in the tail end of the line, currently in Wayne county, has become severe warned with the potential for three-quarter inch hail. Additional severe warnings may occur throughout the night with the potential for large hail, and damaging winds.

These storms may be slow to progress eastward tonight, due to the slow movement of the front and overall northeast movement of the individual cells. Storms may approach the northern I35 corridor around 1 AM; but may not reach areas such as the Des Moines metro until nearly sunrise tomorrow if they continue to develop southward. Current models and forecasts indicate that these storms may not extend any further south than approximately the highway 20 corridor. Additional updates on the storms isn't likely until early tomorrow.