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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