A vigorous upper level low pressure system will drop across the Plains into Kansas and Missouri this afternoon. After some morning drizzle, the center of low pressure will close off and intensify as it crosses Iowa after 2:00 p.m.
A Tornado Watch is now in effect for much of central, southern, and southwestern Iowa until 6:00 p.m.
A strong mid-level jet in the upper layers of the atmosphere will allow strong to severe thunderstorms to develop early on in southeast Nebraska, northeast Kansas, and southwest Iowa by around noon. There is also decent directional shear in the atmosphere that could lead to a few of the storms rotating. This may produce a few tornadoes by mid-afternoon. The highest threat of tornadoes is south of I-80 this afternoon.
The storm will arrive in the metro around 4 p.m. and bring with it heavy rain and the possibility of severe weather.
Behind that system, it will be really windy and cold. A High Wind Warning will go into effect by 9 PM and last through Thursday morning. Highs will be in the 40s by Friday. The metro should drop below 32 degrees by Friday morning.