The National Weather Service in the Quad Cities has issued a

* Severe Thunderstorm Warning for...
northern Iowa County in east central Iowa...
Johnson County in east central Iowa... [i.e., Iowa City]
southern Linn County in east central Iowa... [i.e., Cedar Rapids]

• until 400 PM CDT.

• At 302 PM CDT... National Weather Service Doppler radar indicated a
  

severe thunderstorm capable of producing Golf Ball size hail... and
damaging winds in excess of 60 mph. This storm was located
approximately 17 miles northwest of Victor... or 22 miles northwest
of Marengo... and moving east at 29 mph.

* The severe thunderstorm will be near...
9 miles north of Ladora around 335 PM CDT...
Marengo around 345 PM CDT...
7 miles north of Conroy around 355 PM CDT...
Amana around 400 PM CDT...

This includes Interstate 80 in Iowa between mile markers 212 and 245.

This includes Interstate 380 between mile markers 1 and 22.

Severe thunderstorms can produce tornadoes with little or no advance
warning.

So they'll get more rain on top of the flooding.

I loved and loved living in Iowa City.  Damn, Damn, Damn.