Update: Severe Weather Alert for Johnston Set to Expire at 10 P.M. Sunday

Polk County and much of central Iowa is under a tornado watch until 10 Sunday night, according to the National Weather Service.

The forecast calls for widespread thunderstorms this evening across the area toward the northeast.

The Weather Service says "significant severe weather is expected with these storms later into the evening will all modes of severe weather."

The Polk County Emergency Management Agency's Facebook page says that as of 8:45 p.m. there were: "Branches and trees down blocking the roadways; semi trucks pushed over on I-35 north of Ankeny; numerous power lines downed in the right-of-way and blocking travel lanes; ... Fences down near a pump station in Johnston, rain caused storm sewer surges and man hole covers displaced. ..."

Here's video of high winds bending trees over in Ankeny.

See any damage around Johnston? Have photos from the storm? Share them with your neighbors by clicking on "Upload Photos and Video."

Golf ball-size hail, damaging winds above 60 mph and a few tornadoes will be possible tonight, the forecasters say. Heavy rainfall at times may lead to ponding of water in urban areas.

The bumpy weather continues through early Wednesday, the Weather Channel says, mainly Monday and Tuesday afternoons and evenings.

The storms will cool things off, says weather.com. After a high of 90 today, Monday's high will reach 81 degrees, look for a top temp of 77 on Tuesday, then relatively cool highs of 69 on Wednesday and Thursday.