This was issued by the National Weather Service in the Quad Cities.

…SCATTERED THUNDERSTORMS DEVELOPING NORTH OF I-80…

AT 410 PM CDT DOPPLER RADAR INDICATED SCATTERED THUNDERSTORMS
DEVELOPING NORTH OF I-80. OTHER THUNDERSTORMS NORTH OF HIGHWAY 20
WILL BE MOVING SOUTH INTO NORTHEAST IOWA THROUGH 6 PM.

THE STRONGER STORMS WILL BE CAPABLE OF PRODUCING HEAVY RAIN IN
EXCESS OF ONE INCH…ALONG WITH HAIL TO NEAR PENNY SIZE.