Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0734 PM CDT Thu Apr 17 2025 Valid 180100Z - 181200Z ...THERE IS AN ENHANCED RISK OF SEVERE THUNDERSTORMS FROM EXTREME EASTERN NEBRASKA INTO WESTERN AND CENTRAL IOWA... ...SUMMARY... Isolated to scattered severe thunderstorms will continue early tonight from eastern Nebraska into western and central Iowa. Very large hail to 3 inches in diameter or greater, isolated severe gusts of 60-70 mph, and a couple of tornadoes will all be possible. ...01z Update... Water-vapor imagery suggests a weak short-wave trough is located over western NE, extending into northwest KS. Later tonight an 80kt 500mb speed max will translate across KS toward southeast NE, and this will encourage a marked increase in the LLJ across KS into northwest MO by 06z. Latest radar data depicts isolated-scattered severe supercells near the MO River from eastern NE into western IA. This activity will spread east, aided in part by the aforementioned LLJ. With time, storm inflow will gradually lift as the boundary layer decouples, and storms will become more elevated. For the next few hours very large hail remains possible, along with a risk for tornadoes, and wind. As the storms become elevated hail will become the most likely concern. ..Darrow.. 04/18/2025
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